xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at:

Intro

我想在 MacBook 上试试C语言的编译器cc能不能用，结果报错：

wuyujin1997@mac11 ~ % cc
xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun
wuyujin1997@mac11 ~ % where cc
/usr/bin/cc
wuyujin1997@mac11 ~ %
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解决

下载安装 XCode

先去 App Store 下载安装一个 XCode ：

XCode软件包比较大，装起来挺慢的：

重新测试CC命令

如果运行cc后打印了clang: error: no input files证明：程序已经安装好了，环境变量也配置好了。
如果你想要编译某些C源码，需要说清楚要编译哪些文件？

Last login: Tue Jan 17 16:50:07 on ttys000
wuyujin1997@mac11 ~ % where cc
/usr/bin/cc
wuyujin1997@mac11 ~ % cc
clang: error: no input files
wuyujin1997@mac11 ~ % cc --version
Apple clang version 14.0.0 (clang-1400.0.29.202)
Target: arm64-apple-darwin22.2.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
wuyujin1997@mac11 ~ % 
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那随手写一个hello.c，内容如下：

#include <stdio.h>

int main() {
  printf("Hello world\n");
  return 0;
}
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编译：cc hello.c -o hello
运行：./hello

cc --help 查看帮助信息

wuyujin1997@mac11 ~ % cc --help
OVERVIEW: clang LLVM compiler

USAGE: clang [options] file...

OPTIONS:
  -###                    Print (but do not run) the commands to run for this compilation
  --amdgpu-arch-tool=<value>
                          Tool used for detecting AMD GPU arch in the system.
  --analyzer-output <value>
                          Static analyzer report output format (html|plist|plist-multi-file|plist-html|sarif|sarif-html|text).
  --analyze               Run the static analyzer
  -arcmt-migrate-emit-errors
                          Emit ARC errors even if the migrator can fix them
  -arcmt-migrate-report-output <value>
                          Output path for the plist report
  -B <prefix>             Search $prefix/$triple-$file and $prefix$file for executables, libraries, includes, and data files used by the compiler. $prefix may or may not be a directory
  -b <arg>                Pass -b <arg> to the linker on AIX (only).
  -CC                     Include comments from within macros in preprocessed output
  -cl-denorms-are-zero    OpenCL only. Allow denormals to be flushed to zero.
  -cl-fast-relaxed-math   OpenCL only. Sets -cl-finite-math-only and -cl-unsafe-math-optimizations, and defines __FAST_RELAXED_MATH__.
  -cl-finite-math-only    OpenCL only. Allow floating-point optimizations that assume arguments and results are not NaNs or +-Inf.
  -cl-fp32-correctly-rounded-divide-sqrt
                          OpenCL only. Specify that single precision floating-point divide and sqrt used in the program source are correctly rounded.
  -cl-kernel-arg-info     OpenCL only. Generate kernel argument metadata.
  -cl-mad-enable          OpenCL only. Allow use of less precise MAD computations in the generated binary.
  -cl-no-signed-zeros     OpenCL only. Allow use of less precise no signed zeros computations in the generated binary.
  -cl-no-stdinc           OpenCL only. Disables all standard includes containing non-native compiler types and functions.
  -cl-opt-disable         OpenCL only. This option disables all optimizations. By default optimizations are enabled.
  -cl-single-precision-constant
                          OpenCL only. Treat double precision floating-point constant as single precision constant.
  -cl-std=<value>         OpenCL language standard to compile for.
  -cl-strict-aliasing     OpenCL only. This option is added for compatibility with OpenCL 1.0.
  -cl-uniform-work-group-size
                          OpenCL only. Defines that the global work-size be a multiple of the work-group size specified to clEnqueueNDRangeKernel
  -cl-unsafe-math-optimizations
                          OpenCL only. Allow unsafe floating-point optimizations.  Also implies -cl-no-signed-zeros and -cl-mad-enable.
  --config <value>        Specifies configuration file
  --cuda-compile-host-device
                          Compile CUDA code for both host and device (default).  Has no effect on non-CUDA compilations.
  --cuda-device-only      Compile CUDA code for device only
  --cuda-host-only        Compile CUDA code for host only.  Has no effect on non-CUDA compilations.
  --cuda-include-ptx=<value>
                          Include PTX for the following GPU architecture (e.g. sm_35) or 'all'. May be specified more than once.
  --cuda-noopt-device-debug
                          Enable device-side debug info generation. Disables ptxas optimizations.
  --cuda-path-ignore-env  Ignore environment variables to detect CUDA installation
  --cuda-path=<value>     CUDA installation path
  -cuid=<value>           An ID for compilation unit, which should be the same for the same compilation unit but different for different compilation units. It is used to externalize device-side static variables for single source offloading languages CUDA and HIP so that they can be accessed by the host code of the same compilation unit.
  -cxx-isystem <directory>
                          Add directory to the C++ SYSTEM include search path
  -C                      Include comments in preprocessed output
  -c                      Only run preprocess, compile, and assemble steps
  -dD                     Print macro definitions in -E mode in addition to normal output
  -dependency-dot <value> Filename to write DOT-formatted header dependencies to
  -dependency-file <value>
                          Filename (or -) to write dependency output to
  -dI                     Print include directives in -E mode in addition to normal output
  -dM                     Print macro definitions in -E mode instead of normal output
  -dsym-dir <dir>         Directory to output dSYM's (if any) to
  -D <macro>=<value>      Define <macro> to <value> (or 1 if <value> omitted)
  -emit-ast               Emit Clang AST files for source inputs
  -emit-interface-stubs   Generate Interface Stub Files.
  -emit-llvm              Use the LLVM representation for assembler and object files
  -emit-merged-ifs        Generate Interface Stub Files, emit merged text not binary.
  --emit-static-lib       Enable linker job to emit a static library.
  -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
                          Trivial automatic variable initialization to zero is only here for benchmarks, it'll eventually be removed, and I'm OK with that because I'm only using it to benchmark
  -extract-api            Extract API information
  -E                      Only run the preprocessor
  -faapcs-bitfield-load   Follows the AAPCS standard that all volatile bit-field write generates at least one load. (ARM only).
  -faapcs-bitfield-width  Follow the AAPCS standard requirement stating that volatile bit-field width is dictated by the field container type. (ARM only).
  -faddrsig               Emit an address-significance table
  -falign-loops=<N>       N must be a power of two. Align loops to the boundary
  -faligned-allocation    Enable C++17 aligned allocation functions
  -fallow-editor-placeholders
                          Treat editor placeholders as valid source code
  -faltivec-src-compat=<value>
                          Source-level compatibility for Altivec vectors (for PowerPC targets). This includes results of vector comparison (scalar for 'xl', vector for 'gcc') as well as behavior when initializing with a scalar (splatting for 'xl', element zero only for 'gcc'). For 'mixed', the compatibility is as 'gcc' for 'vector bool/vector pixel' and as 'xl' for other types. Current default is 'mixed'.
  -fansi-escape-codes     Use ANSI escape codes for diagnostics
  -fapinotes-cache-path=<directory>
                          Does nothing; API notes are no longer cached separately from modules
  -fapinotes-modules      Enable module-based external API notes support
  -fapinotes-swift-version=<version>
                          Specify the Swift version to use when filtering API notes
  -fapinotes              Enable external API notes support
  -fapple-kext            Use Apple's kernel extensions ABI
  -fapple-link-rtlib      Force linking the clang builtins runtime library
  -fapple-pragma-pack     Enable Apple gcc-compatible #pragma pack handling
  -fapplication-extension Restrict code to those available for App Extensions
  -fapprox-func           Allow certain math function calls to be replaced with an approximately equivalent calculation
  -fasync-exceptions      Enable EH Asynchronous exceptions
  -fbasic-block-sections=<value>
                          Place each function's basic blocks in unique sections (ELF Only) : all | labels | none | list=<file>
  -fbinutils-version=<major.minor>
                          Produced object files can use all ELF features supported by this binutils version and newer. If -fno-integrated-as is specified, the generated assembly will consider GNU as support. 'none' means that all ELF features can be used, regardless of binutils support. Defaults to 2.26.
  -fblocks                Enable the 'blocks' language feature
  -fborland-extensions    Accept non-standard constructs supported by the Borland compiler
  -fbranch-target-identification
                          Emit branch target identification instructions for indirect branch destinations
  -fbuild-session-file=<file>
                          Use the last modification time of <file> as the build session timestamp
  -fbuild-session-timestamp=<time since Epoch in seconds>
                          Time when the current build session started
  -fbuiltin-module-map    Load the clang builtins module map file.
  -fc++-abi=<value>       C++ ABI to use. This will override the target C++ ABI.
  -fcall-saved-x10        Make the x10 register call-saved (AArch64 only)
  -fcall-saved-x11        Make the x11 register call-saved (AArch64 only)
  -fcall-saved-x12        Make the x12 register call-saved (AArch64 only)
  -fcall-saved-x13        Make the x13 register call-saved (AArch64 only)
  -fcall-saved-x14        Make the x14 register call-saved (AArch64 only)
  -fcall-saved-x15        Make the x15 register call-saved (AArch64 only)
  -fcall-saved-x18        Make the x18 register call-saved (AArch64 only)
  -fcall-saved-x8         Make the x8 register call-saved (AArch64 only)
  -fcall-saved-x9         Make the x9 register call-saved (AArch64 only)
  -fcf-protection=<value> Instrument control-flow architecture protection. Options: return, branch, full, none.
  -fcf-protection         Enable cf-protection in 'full' mode
  -fchar8_t               Enable C++ builtin type char8_t
  -fclang-abi-compat=<version>
                          Attempt to match the ABI of Clang <version>
  -fcolor-diagnostics     Enable colors in diagnostics
  -fcomment-block-commands=<arg>
                          Treat each comma separated argument in <arg> as a documentation comment block command
  -fcommon                Place uninitialized global variables in a common block
  -fcomplete-member-pointers
                          Require member pointer base types to be complete if they would be significant under the Microsoft ABI
  -fconvergent-functions  Assume functions may be convergent
  -fcoroutines-ts         Enable support for the C++ Coroutines TS
  -fcoverage-mapping      Generate coverage mapping to enable code coverage analysis
  -fcoverage-prefix-map=<value>
                          remap file source paths in coverage mapping
  -fcrash-diagnostics-dir=<dir>
                          Put crash-report files in <dir>
  -fcs-profile-generate=<directory>
                          Generate instrumented code to collect context sensitive execution counts into <directory>/default.profraw (overridden by LLVM_PROFILE_FILE env var)
  -fcs-profile-generate   Generate instrumented code to collect context sensitive execution counts into default.profraw (overridden by LLVM_PROFILE_FILE env var)
  -fcuda-approx-transcendentals
                          Use approximate transcendental functions
  -fcuda-short-ptr        Use 32-bit pointers for accessing const/local/shared address spaces
  -fcxx-exceptions        Enable C++ exceptions
  -fcxx-modules           Enable modules for C++
  -fdata-sections         Place each data in its own section
  -fdebug-compilation-dir=<value>
                          The compilation directory to embed in the debug info
  -fdebug-default-version=<value>
                          Default DWARF version to use, if a -g option caused DWARF debug info to be produced
  -fdebug-info-for-profiling
                          Emit extra debug info to make sample profile more accurate
  -fdebug-macro           Emit macro debug information
  -fdebug-prefix-map=<value>
                          remap file source paths in debug info
  -fdebug-ranges-base-address
                          Use DWARF base address selection entries in .debug_ranges
  -fdebug-types-section   Place debug types in their own section (ELF Only)
  -fdeclspec              Allow __declspec as a keyword
  -fdelayed-template-parsing
                          Parse templated function definitions at the end of the translation unit
  -fdelete-null-pointer-checks
                          Treat usage of null pointers as undefined behavior (default)
  -fdiagnostics-absolute-paths
                          Print absolute paths in diagnostics
  -fdiagnostics-hotness-threshold=<value>
                          Prevent optimization remarks from being output if they do not have at least this profile count. Use 'auto' to apply the threshold from profile summary
  -fdiagnostics-parseable-fixits
                          Print fix-its in machine parseable form
  -fdiagnostics-print-source-range-info
                          Print source range spans in numeric form
  -fdiagnostics-show-hotness
                          Enable profile hotness information in diagnostic line
  -fdiagnostics-show-note-include-stack
                          Display include stacks for diagnostic notes
  -fdiagnostics-show-option
                          Print option name with mappable diagnostics
  -fdiagnostics-show-template-tree
                          Print a template comparison tree for differing templates
  -fdigraphs              Enable alternative token representations '<:', ':>', '<%', '%>', '%:', '%:%:' (default)
  -fdirect-access-external-data
                          Don't use GOT indirection to reference external data symbols
  -fdiscard-value-names   Discard value names in LLVM IR
  -fdollars-in-identifiers
                          Allow '$' in identifiers
  -fdouble-square-bracket-attributes
                          Enable '[[]]' attributes in all C and C++ language modes
  -fdriver-only           Only run the driver.
  -fdwarf-exceptions      Use DWARF style exceptions
  -feliminate-unused-debug-types
                          Do not emit  debug info for defined but unused types
  -fembed-bitcode-marker  Embed placeholder LLVM IR data as a marker
  -fembed-bitcode=<option>
                          Embed LLVM bitcode (option: off, all, bitcode, marker)
  -fembed-bitcode         Embed LLVM IR bitcode as data
  -femit-all-decls        Emit all declarations, even if unused
  -femulated-tls          Use emutls functions to access thread_local variables
  -fenable-matrix         Enable matrix data type and related builtin functions
  -fexceptions            Enable support for exception handling
  -fexperimental-new-constant-interpreter
                          Enable the experimental new constant interpreter
  -fexperimental-relative-c++-abi-vtables
                          Use the experimental C++ class ABI for classes with virtual tables
  -fexperimental-strict-floating-point
                          Enables experimental strict floating point in LLVM.
  -fextend-arguments=<value>
                          Controls how scalar integer arguments are extended in calls to unprototyped and varargs functions
  -ffast-math             Allow aggressive, lossy floating-point optimizations
  -ffile-compilation-dir=<value>
                          The compilation directory to embed in the debug info and coverage mapping.
  -ffile-prefix-map=<value>
                          remap file source paths in debug info, predefined preprocessor macros and __builtin_FILE()
  -ffine-grained-bitfield-accesses
                          Use separate accesses for consecutive bitfield runs with legal widths and alignments.
  -ffinite-loops          Assume all loops are finite.
  -ffixed-a0              Reserve the a0 register (M68k only)
  -ffixed-a1              Reserve the a1 register (M68k only)
  -ffixed-a2              Reserve the a2 register (M68k only)
  -ffixed-a3              Reserve the a3 register (M68k only)
  -ffixed-a4              Reserve the a4 register (M68k only)
  -ffixed-a5              Reserve the a5 register (M68k only)
  -ffixed-a6              Reserve the a6 register (M68k only)
  -ffixed-d0              Reserve the d0 register (M68k only)
  -ffixed-d1              Reserve the d1 register (M68k only)
  -ffixed-d2              Reserve the d2 register (M68k only)
  -ffixed-d3              Reserve the d3 register (M68k only)
  -ffixed-d4              Reserve the d4 register (M68k only)
  -ffixed-d5              Reserve the d5 register (M68k only)
  -ffixed-d6              Reserve the d6 register (M68k only)
  -ffixed-d7              Reserve the d7 register (M68k only)
  -ffixed-point           Enable fixed point types
  -ffixed-r19             Reserve register r19 (Hexagon only)
  -ffixed-r9              Reserve the r9 register (ARM only)
  -ffixed-x10             Reserve the x10 register (AArch64/RISC-V only)
  -ffixed-x11             Reserve the x11 register (AArch64/RISC-V only)
  -ffixed-x12             Reserve the x12 register (AArch64/RISC-V only)
  -ffixed-x13             Reserve the x13 register (AArch64/RISC-V only)
  -ffixed-x14             Reserve the x14 register (AArch64/RISC-V only)
  -ffixed-x15             Reserve the x15 register (AArch64/RISC-V only)
  -ffixed-x16             Reserve the x16 register (AArch64/RISC-V only)
  -ffixed-x17             Reserve the x17 register (AArch64/RISC-V only)
  -ffixed-x18             Reserve the x18 register (AArch64/RISC-V only)
  -ffixed-x19             Reserve the x19 register (AArch64/RISC-V only)
  -ffixed-x1              Reserve the x1 register (AArch64/RISC-V only)
  -ffixed-x20             Reserve the x20 register (AArch64/RISC-V only)
  -ffixed-x21             Reserve the x21 register (AArch64/RISC-V only)
  -ffixed-x22             Reserve the x22 register (AArch64/RISC-V only)
  -ffixed-x23             Reserve the x23 register (AArch64/RISC-V only)
  -ffixed-x24             Reserve the x24 register (AArch64/RISC-V only)
  -ffixed-x25             Reserve the x25 register (AArch64/RISC-V only)
  -ffixed-x26             Reserve the x26 register (AArch64/RISC-V only)
  -ffixed-x27             Reserve the x27 register (AArch64/RISC-V only)
  -ffixed-x28             Reserve the x28 register (AArch64/RISC-V only)
  -ffixed-x29             Reserve the x29 register (AArch64/RISC-V only)
  -ffixed-x2              Reserve the x2 register (AArch64/RISC-V only)
  -ffixed-x30             Reserve the x30 register (AArch64/RISC-V only)
  -ffixed-x31             Reserve the x31 register (AArch64/RISC-V only)
  -ffixed-x3              Reserve the x3 register (AArch64/RISC-V only)
  -ffixed-x4              Reserve the x4 register (AArch64/RISC-V only)
  -ffixed-x5              Reserve the x5 register (AArch64/RISC-V only)
  -ffixed-x6              Reserve the x6 register (AArch64/RISC-V only)
  -ffixed-x7              Reserve the x7 register (AArch64/RISC-V only)
  -ffixed-x8              Reserve the x8 register (AArch64/RISC-V only)
  -ffixed-x9              Reserve the x9 register (AArch64/RISC-V only)
  -fforce-dwarf-frame     Always emit a debug frame section
  -fforce-emit-vtables    Emits more virtual tables to improve devirtualization
  -fforce-enable-int128   Enable support for int128_t type
  -ffp-contract=<value>   Form fused FP ops (e.g. FMAs): fast (fuses across statements disregarding pragmas) | on (only fuses in the same statement unless dictated by pragmas) | off (never fuses) | fast-honor-pragmas (fuses across statements unless diectated by pragmas). Default is 'fast' for CUDA, 'fast-honor-pragmas' for HIP, and 'on' otherwise.
  -ffp-exception-behavior=<value>
                          Specifies the exception behavior of floating-point operations.
  -ffp-model=<value>      Controls the semantics of floating-point calculations.
  -ffreestanding          Assert that the compilation takes place in a freestanding environment
  -ffuchsia-api-level=<value>
                          Set Fuchsia API level
  -ffunction-sections     Place each function in its own section
  -fgeneric-block-helpers Use generic block helpers for copying/destroying blocks
  -fglobal-isel           Enables the global instruction selector
  -fgnu-keywords          Allow GNU-extension keywords regardless of language standard
  -fgnu-runtime           Generate output compatible with the standard GNU Objective-C runtime
  -fgnu89-inline          Use the gnu89 inline semantics
  -fgnuc-version=<value>  Sets various macros to claim compatibility with the given GCC version (default is 4.2.1)
  -fgpu-allow-device-init Allow device side init function in HIP (experimental)
  -fgpu-defer-diag        Defer host/device related diagnostic messages for CUDA/HIP
  -fgpu-flush-denormals-to-zero
                          Flush denormal floating point values to zero in CUDA/HIP device mode.
  -fgpu-rdc               Generate relocatable device code, also known as separate compilation mode
  -fgpu-sanitize          Enable sanitizer for AMDGPU target
  -fhip-fp32-correctly-rounded-divide-sqrt
                          Specify that single precision floating-point divide and sqrt used in the program source are correctly rounded (HIP device compilation only)
  -fhip-new-launch-api    Use new kernel launching API for HIP
  -fignore-exceptions     Enable support for ignoring exception handling constructs
  -fimplicit-module-maps  Implicitly search the file system for module map files.
  -fin-descriptor-block-flags
                          Emit in-descriptor block flags
  -finline-functions      Inline suitable functions
  -finline-hint-functions Inline functions which are (explicitly or implicitly) marked inline
  -finput-charset=<value> Specify the default character set for source files
  -finstrument-function-entry-bare
                          Instrument function entry only, after inlining, without arguments to the instrumentation call
  -finstrument-functions-after-inlining
                          Like -finstrument-functions, but insert the calls after inlining
  -finstrument-functions  Generate calls to instrument function entry and exit
  -fintegrated-as         Enable the integrated assembler
  -fintegrated-cc1        Run cc1 in-process
  -fjump-tables           Use jump tables for lowering switches
  -fkeep-static-consts    Keep static const variables if unused
  -flax-vector-conversions=<value>
                          Enable implicit vector bit-casts
  -flegacy-pass-manager   Use the legacy pass manager in LLVM (deprecated, to be removed in a future release)
  -flto-jobs=<value>      Controls the backend parallelism of -flto=thin (default of 0 means the number of threads will be derived from the number of CPUs detected)
  -flto=auto              Enable LTO in 'full' mode
  -flto=jobserver         Enable LTO in 'full' mode
  -flto=<value>           Set LTO mode to either 'full' or 'thin'
  -flto                   Enable LTO in 'full' mode
  -fmacro-prefix-map=<value>
                          remap file source paths in predefined preprocessor macros and __builtin_FILE()
  -fmath-errno            Require math functions to indicate errors by setting errno
  -fmax-tokens=<value>    Max total number of preprocessed tokens for -Wmax-tokens.
  -fmax-type-align=<value>
                          Specify the maximum alignment to enforce on pointers lacking an explicit alignment
  -fmemory-profile=<directory>
                          Enable heap memory profiling and dump results into <directory>
  -fmemory-profile        Enable heap memory profiling
  -fmerge-all-constants   Allow merging of constants
  -fmessage-length=<value>
                          Format message diagnostics so that they fit within N columns
  -fminimize-whitespace   Minimize whitespace when emitting preprocessor output
  -fmodule-file=[<name>=]<file>
                          Specify the mapping of module name to precompiled module file, or load a module file if name is omitted.
  -fmodule-map-file=<file>
                          Load this module map file
  -fmodule-name=<name>    Specify the name of the module to build
  -fmodule-related-to-pch Mark module as related to a PCH
  -fmodules-cache-path=<directory>
                          Specify the module cache path
  -fmodules-decluse       Require declaration of modules used within a module
  -fmodules-disable-diagnostic-validation
                          Disable validation of the diagnostic options when loading the module
  -fmodules-ignore-macro=<value>
                          Ignore the definition of the given macro when building and loading modules
  -fmodules-prune-after=<seconds>
                          Specify the interval (in seconds) after which a module file will be considered unused
  -fmodules-prune-interval=<seconds>
                          Specify the interval (in seconds) between attempts to prune the module cache
  -fmodules-search-all    Search even non-imported modules to resolve references
  -fmodules-strict-decluse
                          Like -fmodules-decluse but requires all headers to be in modules
  -fmodules-ts            Enable support for the C++ Modules TS
  -fmodules-user-build-path <directory>
                          Specify the module user build path
  -fmodules-validate-input-files-content
                          Validate PCM input files based on content if mtime differs
  -fmodules-validate-once-per-build-session
                          Don't verify input files for the modules if the module has been successfully validated or loaded during this build session
  -fmodules-validate-system-headers
                          Validate the system headers that a module depends on when loading the module
  -fmodules               Enable the 'modules' language feature
  -fms-compatibility-version=<value>
                          Dot-separated value representing the Microsoft compiler version number to report in _MSC_VER (0 = don't define it (default))
  -fms-compatibility      Enable full Microsoft Visual C++ compatibility
  -fms-extensions         Accept some non-standard constructs supported by the Microsoft compiler
  -fmsc-version=<value>   Microsoft compiler version number to report in _MSC_VER (0 = don't define it (default))
  -fnew-alignment=<align> Specifies the largest alignment guaranteed by '::operator new(size_t)'
  -fnew-infallible        Treats throwing global C++ operator new as always returning valid memory (annotates with __attribute__((returns_nonnull)) and throw()). This is detectable in source.
  -fno-aapcs-bitfield-width
                          Do not follow the AAPCS standard requirement stating that volatile bit-field width is dictated by the field container type. (ARM only).
  -fno-access-control     Disable C++ access control
  -fno-addrsig            Don't emit an address-significance table
  -fno-apinotes-modules   Disable module-based external API notes support
  -fno-apinotes           Disable external API notes support
  -fno-assume-sane-operator-new
                          Don't assume that C++'s global operator new can't alias any pointer
  -fno-autolink           Disable generation of linker directives for automatic library linking
  -fno-builtin-<value>    Disable implicit builtin knowledge of a specific function
  -fno-builtin            Disable implicit builtin knowledge of functions
  -fno-c++-static-destructors
                          Disable C++ static destructor registration
  -fno-char8_t            Disable C++ builtin type char8_t
  -fno-color-diagnostics  Disable colors in diagnostics
  -fno-common             Compile common globals like normal definitions
  -fno-complete-member-pointers
                          Do not require member pointer base types to be complete if they would be significant under the Microsoft ABI
  -fno-constant-cfstrings Disable creation of CodeFoundation-type constant strings
  -fno-constant-nsarray-literals
                          Disable creation of CodeFoundation-type constant initializer `NSArray`s from array literals
  -fno-constant-nsdictionary-literals
                          Disable creation of CodeFoundation-type constant initializer `NSDictionary`s from dictionary literals
  -fno-constant-nsnumber-literals
                          Disable creation of CodeFoundation-type constant initializer `NSNumber`s from number literals
  -fno-coverage-mapping   Disable code coverage analysis
  -fno-crash-diagnostics  Disable auto-generation of preprocessed source files and a script for reproduction during a clang crash
  -fno-cuda-approx-transcendentals
                          Don't use approximate transcendental functions
  -fno-cxx-modules        Disable modules for C++
  -fno-debug-macro        Do not emit macro debug information
  -fno-declspec           Disallow __declspec as a keyword
  -fno-delayed-template-parsing
                          Disable delayed template parsing
  -fno-delete-null-pointer-checks
                          Do not treat usage of null pointers as undefined behavior
  -fno-diagnostics-fixit-info
                          Do not include fixit information in diagnostics
  -fno-digraphs           Disallow alternative token representations '<:', ':>', '<%', '%>', '%:', '%:%:'
  -fno-direct-access-external-data
                          Use GOT indirection to reference external data symbols
  -fno-discard-value-names
                          Do not discard value names in LLVM IR
  -fno-dollars-in-identifiers
                          Disallow '$' in identifiers
  -fno-double-square-bracket-attributes
                          Disable '[[]]' attributes in all C and C++ language modes
  -fno-elide-constructors Disable C++ copy constructor elision
  -fno-elide-type         Do not elide types when printing diagnostics
  -fno-eliminate-unused-debug-types
                          Emit  debug info for defined but unused types
  -fno-exceptions         Disable support for exception handling
  -fno-experimental-relative-c++-abi-vtables
                          Do not use the experimental C++ class ABI for classes with virtual tables
  -fno-fine-grained-bitfield-accesses
                          Use large-integer access for consecutive bitfield runs.
  -fno-finite-loops       Do not assume that any loop is finite.
  -fno-fixed-point        Disable fixed point types
  -fno-force-enable-int128
                          Disable support for int128_t type
  -fno-generic-block-helpers
                          Don't use generic block helpers for copying/destroying blocks
  -fno-global-isel        Disables the global instruction selector
  -fno-gnu-inline-asm     Disable GNU style inline asm
  -fno-gpu-allow-device-init
                          Don't allow device side init function in HIP (experimental)
  -fno-gpu-defer-diag     Don't defer host/device related diagnostic messages for CUDA/HIP
  -fno-hip-fp32-correctly-rounded-divide-sqrt
                          Don't specify that single precision floating-point divide and sqrt used in the program source are correctly rounded (HIP device compilation only)
  -fno-hip-new-launch-api Don't use new kernel launching API for HIP
  -fno-in-descriptor-block-flags
                          Don't emit in-descriptor block flags
  -fno-integrated-as      Disable the integrated assembler
  -fno-integrated-cc1     Spawn a separate process for each cc1
  -fno-jump-tables        Do not use jump tables for lowering switches
  -fno-keep-static-consts Don't keep static const variables if unused
  -fno-legacy-pass-manager
                          Use the new pass manager in LLVM
  -fno-lto                Disable LTO mode (default)
  -fno-memory-profile     Disable heap memory profiling
  -fno-merge-all-constants
                          Disallow merging of constants
  -fno-objc-infer-related-result-type
                          do not infer Objective-C related result type based on method family
  -fno-offload-lto        Disable LTO mode (default) for offload compilation
  -fno-openmp-extensions  Disable all Clang extensions for OpenMP directives and clauses
  -fno-operator-names     Do not treat C++ operator name keywords as synonyms for operators
  -fno-pch-codegen        Do not generate code for uses of this PCH that assumes an explicit object file will be built for the PCH
  -fno-pch-debuginfo      Do not generate debug info for types in an object file built from this PCH and do not generate them elsewhere
  -fno-plt                Use GOT indirection instead of PLT to make external function calls (x86 only)
  -fno-preserve-as-comments
                          Do not preserve comments in inline assembly
  -fno-profile-generate   Disable generation of profile instrumentation.
  -fno-profile-instr-generate
                          Disable generation of profile instrumentation.
  -fno-profile-instr-use  Disable using instrumentation data for profile-guided optimization
  -fno-pseudo-probe-for-profiling
                          Do not emit pseudo probes for sample profiling
  -fno-ptrauth-abi-version
                          Disable Pointer Authentication ABI versioning
  -fno-ptrauth-kernel-abi-version
                          Disable Pointer Authentication kernel ABI versioning
  -fno-register-global-dtors-with-atexit
                          Don't use atexit or __cxa_atexit to register global destructors
  -fno-rtlib-add-rpath    Do not add -rpath with architecture-specific resource directory to the linker flags
  -fno-rtti-data          Disable generation of RTTI data
  -fno-rtti               Disable generation of rtti information
  -fno-sanitize-address-outline-instrumentation
                          Use default code inlining logic for the address sanitizer
  -fno-sanitize-address-poison-custom-array-cookie
                          Disable poisoning array cookies when using custom operator new[] in AddressSanitizer
  -fno-sanitize-address-use-after-scope
                          Disable use-after-scope detection in AddressSanitizer
  -fno-sanitize-address-use-odr-indicator
                          Disable ODR indicator globals
  -fno-sanitize-cfi-canonical-jump-tables
                          Do not make the jump table addresses canonical in the symbol table
  -fno-sanitize-cfi-cross-dso
                          Disable control flow integrity (CFI) checks for cross-DSO calls.
  -fno-sanitize-coverage=<value>
                          Disable features of coverage instrumentation for Sanitizers
  -fno-sanitize-hwaddress-experimental-aliasing
                          Disable aliasing mode in HWAddressSanitizer
  -fno-sanitize-ignorelist
                          Don't use ignorelist file for sanitizers
  -fno-sanitize-memory-track-origins
                          Disable origins tracking in MemorySanitizer
  -fno-sanitize-memory-use-after-dtor
                          Disable use-after-destroy detection in MemorySanitizer
  -fno-sanitize-recover=<value>
                          Disable recovery for specified sanitizers
  -fno-sanitize-stats     Disable sanitizer statistics gathering.
  -fno-sanitize-thread-atomics
                          Disable atomic operations instrumentation in ThreadSanitizer
  -fno-sanitize-thread-func-entry-exit
                          Disable function entry/exit instrumentation in ThreadSanitizer
  -fno-sanitize-thread-memory-access
                          Disable memory access instrumentation in ThreadSanitizer
  -fno-sanitize-trap=<value>
                          Disable trapping for specified sanitizers
  -fno-sanitize-trap      Disable trapping for all sanitizers
  -fno-short-wchar        Force wchar_t to be an unsigned int
  -fno-show-column        Do not include column number on diagnostics
  -fno-show-source-location
                          Do not include source location information with diagnostics
  -fno-signed-char        char is unsigned
  -fno-signed-zeros       Allow optimizations that ignore the sign of floating point zeros
  -fno-spell-checking     Disable spell-checking
  -fno-split-machine-functions
                          Disable late function splitting using profile information (x86 ELF)
  -fno-split-stack        Wouldn't use segmented stack
  -fno-stack-check        Disable stack checking
  -fno-stack-clash-protection
                          Disable stack clash protection
  -fno-stack-protector    Disable the use of stack protectors
  -fno-standalone-debug   Limit debug information produced to reduce size of debug binary
  -fno-strict-float-cast-overflow
                          Relax language rules and try to match the behavior of the target's native float-to-int conversion instructions
  -fno-strict-return      Don't treat control flow paths that fall off the end of a non-void function as unreachable
  -fno-sycl               Disables SYCL kernels compilation for device
  -fno-temp-file          Directly create compilation output files. This may lead to incorrect incremental builds if the compiler crashes
  -fno-threadsafe-statics Do not emit code to make initialization of local statics thread safe
  -fno-trigraphs          Do not process trigraph sequences
  -fno-unique-section-names
                          Don't use unique names for text and data sections
  -fno-unroll-loops       Turn off loop unroller
  -fno-use-cxa-atexit     Don't use __cxa_atexit for calling destructors
  -fno-use-init-array     Use .ctors/.dtors instead of .init_array/.fini_array
  -fno-visibility-inlines-hidden-static-local-var
                          Disables -fvisibility-inlines-hidden-static-local-var (this is the default on non-darwin targets)
  -fno-xray-function-index
                          Omit function index section at the expense of single-function patching performance
  -fno-zero-initialized-in-bss
                          Don't place zero initialized data in BSS
  -fobjc-arc-exceptions   Use EH-safe code when synthesizing retains and releases in -fobjc-arc
  -fobjc-arc              Synthesize retain and release calls for Objective-C pointers
  -fobjc-disable-direct-methods-for-testing
                          Ignore attribute objc_direct so that direct methods can be tested
  -fobjc-encode-cxx-class-template-spec
                          Fully encode c++ class template specialization
  -fobjc-exceptions       Enable Objective-C exceptions
  -fobjc-relative-method-lists
                          Enable relative method lists
  -fobjc-runtime=<value>  Specify the target Objective-C runtime kind and version
  -fobjc-weak             Enable ARC-style weak references in Objective-C
  -foffload-lto=<value>   Set LTO mode to either 'full' or 'thin' for offload compilation
  -foffload-lto           Enable LTO in 'full' mode for offload compilation
  -fopenmp-extensions     Enable all Clang extensions for OpenMP directives and clauses
  -fopenmp-simd           Emit OpenMP code only for SIMD-based constructs.
  -fopenmp-target-debug   Enable debugging in the OpenMP offloading device RTL
  -fopenmp-target-new-runtime
                          Use the new bitcode library for OpenMP offloading
  -fopenmp-targets=<value>
                          Specify comma-separated list of triples OpenMP offloading targets to be supported
  -fopenmp                Parse OpenMP pragmas and generate parallel code.
  -foptimization-record-file=<file>
                          Specify the output name of the file containing the optimization remarks. Implies -fsave-optimization-record. On Darwin platforms, this cannot be used with multiple -arch <arch> options.
  -foptimization-record-passes=<regex>
                          Only include passes which match a specified regular expression in the generated optimization record (by default, include all passes)
  -forder-file-instrumentation
                          Generate instrumented code to collect order file into default.profraw file (overridden by '=' form of option or LLVM_PROFILE_FILE env var)
  -fpack-struct=<value>   Specify the default maximum struct packing alignment
  -fpascal-strings        Recognize and construct Pascal-style string literals
  -fpass-plugin=<dsopath> Load pass plugin from a dynamic shared object file (only with new pass manager).
  -fpatchable-function-entry=<N,M>
                          Generate M NOPs before function entry and N-M NOPs after function entry
  -fpcc-struct-return     Override the default ABI to return all structs on the stack
  -fpch-codegen           Generate code for uses of this PCH that assumes an explicit object file will be built for the PCH
  -fpch-debuginfo         Generate debug info for types in an object file built from this PCH and do not generate them elsewhere
  -fpch-instantiate-templates
                          Instantiate templates already while building a PCH
  -fpch-validate-input-files-content
                          Validate PCH input files based on content if mtime differs
  -fplugin=<dsopath>      Load the named plugin (dynamic shared object)
  -fprebuilt-implicit-modules
                          Look up implicit modules in the prebuilt module path
  -fprebuilt-module-path=<directory>
                          Specify the prebuilt module path
  -fproc-stat-report=<value>
                          Save subprocess statistics to the given file
  -fproc-stat-report<value>
                          Print subprocess statistics
  -fprofile-exclude-files=<value>
                          Instrument only functions from files where names don't match all the regexes separated by a semi-colon
  -fprofile-filter-files=<value>
                          Instrument only functions from files where names match any regex separated by a semi-colon
  -fprofile-generate=<directory>
                          Generate instrumented code to collect execution counts into <directory>/default.profraw (overridden by LLVM_PROFILE_FILE env var)
  -fprofile-generate      Generate instrumented code to collect execution counts into default.profraw (overridden by LLVM_PROFILE_FILE env var)
  -fprofile-instr-generate=<file>
                          Generate instrumented code to collect execution counts into <file> (overridden by LLVM_PROFILE_FILE env var)
  -fprofile-instr-generate
                          Generate instrumented code to collect execution counts into default.profraw file (overridden by '=' form of option or LLVM_PROFILE_FILE env var)
  -fprofile-instr-use=<value>
                          Use instrumentation data for profile-guided optimization
  -fprofile-list=<value>  Filename defining the list of functions/files to instrument
  -fprofile-remapping-file=<file>
                          Use the remappings described in <file> to match the profile data against names in the program
  -fprofile-sample-accurate
                          Specifies that the sample profile is accurate
  -fprofile-sample-use=<value>
                          Enable sample-based profile guided optimizations
  -fprofile-update=<method>
                          Set update method of profile counters (atomic,prefer-atomic,single)
  -fprofile-use=<pathname>
                          Use instrumentation data for profile-guided optimization. If pathname is a directory, it reads from <pathname>/default.profdata. Otherwise, it reads from file <pathname>.
  -fprotect-parens        Determines whether the optimizer honors parentheses when floating-point expressions are evaluated
  -fpseudo-probe-for-profiling
                          Emit pseudo probes for sample profiling
  -fptrauth-abi-version=<value>
                          Pointer Authentication ABI version
  -fptrauth-auth-traps    Enable traps on authentication failures
  -fptrauth-block-descriptor-pointers
                          enable signing block descriptors
  -fptrauth-calls         Enable signing and authentication of all indirect calls
  -fptrauth-function-pointer-type-discrimination
                          Enabling type discrimination on C function pointers
  -fptrauth-indirect-gotos
                          Enable signing and authentication of indirect goto targets
  -fptrauth-intrinsics    Enable pointer-authentication intrinsics
  -fptrauth-kernel-abi-version
                          Enable Pointer Authentication kernel ABI version
  -fptrauth-objc-class-ro Enable signing and authentication for ObjC class_ro pointers
  -fptrauth-objc-interface-sel
                          Enable signing and authentication of Objective-C object's 'SEL' fields
  -fptrauth-objc-isa-masking
                          pre- and post-authentication masking mode of objective-c isa pointers
  -fptrauth-objc-isa-mode=<value>
                          Authentication mode for ObjC isa field. Full auth if unspecified
  -fptrauth-objc-isa      Enable signing and authentication of Objective-C object's 'isa' field
  -fptrauth-returns       Enable signing and authentication of return addresses
  -fptrauth-soft          Enable software lowering of pointer authentication
  -fptrauth-vtable-pointer-address-discrimination
                          Enable address discrimination of vtable pointers
  -fptrauth-vtable-pointer-type-discrimination
                          Enable type discrimination of vtable pointers
  -freciprocal-math       Allow division operations to be reassociated
  -freg-struct-return     Override the default ABI to return small structs in registers
  -fregister-global-dtors-with-atexit
                          Use atexit or __cxa_atexit to register global destructors
  -frelaxed-template-template-args
                          Enable C++17 relaxed template template argument matching
  -freroll-loops          Turn on loop reroller
  -fropi                  Generate read-only position independent code (ARM only)
  -frtlib-add-rpath       Add -rpath with architecture-specific resource directory to the linker flags
  -frwpi                  Generate read-write position independent code (ARM only)
  -fsanitize-address-destructor=<value>
                          Set destructor type used in ASan instrumentation
  -fsanitize-address-field-padding=<value>
                          Level of field padding for AddressSanitizer
  -fsanitize-address-globals-dead-stripping
                          Enable linker dead stripping of globals in AddressSanitizer
  -fsanitize-address-outline-instrumentation
                          Always generate function calls for address sanitizer instrumentation
  -fsanitize-address-poison-custom-array-cookie
                          Enable poisoning array cookies when using custom operator new[] in AddressSanitizer
  -fsanitize-address-use-after-return=<mode>
                          Select the mode of detecting stack use-after-return in AddressSanitizer: never | runtime (default) | always
  -fsanitize-address-use-after-scope
                          Enable use-after-scope detection in AddressSanitizer
  -fsanitize-address-use-odr-indicator
                          Enable ODR indicator globals to avoid false ODR violation reports in partially sanitized programs at the cost of an increase in binary size
  -fsanitize-blacklist=<value>
                          Alias for -fsanitize-ignorelist=
  -fsanitize-cfi-canonical-jump-tables
                          Make the jump table addresses canonical in the symbol table
  -fsanitize-cfi-cross-dso
                          Enable control flow integrity (CFI) checks for cross-DSO calls.
  -fsanitize-cfi-icall-generalize-pointers
                          Generalize pointers in CFI indirect call type signature checks
  -fsanitize-coverage-allowlist=<value>
                          Restrict sanitizer coverage instrumentation exclusively to modules and functions that match the provided special case list, except the blocked ones
  -fsanitize-coverage-blacklist=<value>
                          Deprecated, use -fsanitize-coverage-ignorelist= instead
  -fsanitize-coverage-ignorelist=<value>
                          Disable sanitizer coverage instrumentation for modules and functions that match the provided special case list, even the allowed ones
  -fsanitize-coverage-whitelist=<value>
                          Deprecated, use -fsanitize-coverage-allowlist= instead
  -fsanitize-coverage=<value>
                          Specify the type of coverage instrumentation for Sanitizers
  -fsanitize-hwaddress-abi=<value>
                          Select the HWAddressSanitizer ABI to target (interceptor or platform, default interceptor). This option is currently unused.
  -fsanitize-hwaddress-experimental-aliasing
                          Enable aliasing mode in HWAddressSanitizer
  -fsanitize-ignorelist=<value>
                          Path to ignorelist file for sanitizers
  -fsanitize-memory-track-origins=<value>
                          Enable origins tracking in MemorySanitizer
  -fsanitize-memory-track-origins
                          Enable origins tracking in MemorySanitizer
  -fsanitize-memory-use-after-dtor
                          Enable use-after-destroy detection in MemorySanitizer
  -fsanitize-recover=<value>
                          Enable recovery for specified sanitizers
  -fsanitize-stats        Enable sanitizer statistics gathering.
  -fsanitize-system-blacklist=<value>
                          Alias for -fsanitize-system-ignorelist=
  -fsanitize-system-ignorelist=<value>
                          Path to system ignorelist file for sanitizers
  -fsanitize-thread-atomics
                          Enable atomic operations instrumentation in ThreadSanitizer (default)
  -fsanitize-thread-func-entry-exit
                          Enable function entry/exit instrumentation in ThreadSanitizer (default)
  -fsanitize-thread-memory-access
                          Enable memory access instrumentation in ThreadSanitizer (default)
  -fsanitize-trap=<value> Enable trapping for specified sanitizers
  -fsanitize-trap         Enable trapping for all sanitizers
  -fsanitize-undefined-strip-path-components=<number>
                          Strip (or keep only, if negative) a given number of path components when emitting check metadata.
  -fsanitize=<check>      Turn on runtime checks for various forms of undefined or suspicious behavior. See user manual for available checks
  -fsave-optimization-record=<format>
                          Generate an optimization record file in a specific format
  -fsave-optimization-record
                          Generate a YAML optimization record file
  -fseh-exceptions        Use SEH style exceptions
  -fshort-enums           Allocate to an enum type only as many bytes as it needs for the declared range of possible values
  -fshort-wchar           Force wchar_t to be a short unsigned int
  -fshow-overloads=<value>
                          Which overload candidates to show when overload resolution fails: best|all; defaults to all
  -fshow-skipped-includes Show skipped includes in -H output.
  -fsigned-char           char is signed
  -fsized-deallocation    Enable C++14 sized global deallocation functions
  -fsjlj-exceptions       Use SjLj style exceptions
  -fslp-vectorize         Enable the superword-level parallelism vectorization passes
  -fsmall-block-descriptors
                          Enable small block descriptors
  -fsplit-dwarf-inlining  Provide minimal debug info in the object/executable to facilitate online symbolication/stack traces in the absence of .dwo/.dwp files when using Split DWARF
  -fsplit-lto-unit        Enables splitting of the LTO unit
  -fsplit-machine-functions
                          Enable late function splitting using profile information (x86 ELF)
  -fsplit-stack           Use segmented stack
  -fstack-check           Enable stack checking
  -fstack-clash-protection
                          Enable stack clash protection
  -fstack-protector-all   Enable stack protectors for all functions
  -fstack-protector-strong
                          Enable stack protectors for some functions vulnerable to stack smashing. Compared to -fstack-protector, this uses a stronger heuristic that includes functions containing arrays of any size (and any type), as well as any calls to alloca or the taking of an address from a local variable
  -fstack-protector       Enable stack protectors for some functions vulnerable to stack smashing. This uses a loose heuristic which considers functions vulnerable if they contain a char (or 8bit integer) array or constant sized calls to alloca , which are of greater size than ssp-buffer-size (default: 8 bytes). All variable sized calls to alloca are considered vulnerable. A function with a stack protector has a guard value added to the stack frame that is checked on function exit. The guard value must be positioned in the stack frame such that a buffer overflow from a vulnerable variable will overwrite the guard value before overwriting the function's return address. The reference stack guard value is stored in a global variable.
  -fstack-size-section    Emit section containing metadata on function stack sizes
  -fstack-usage           Emit .su file containing information on function stack sizes
  -fstandalone-debug      Emit full debug info for all types used by the program
  -fstrict-enums          Enable optimizations based on the strict definition of an enum's value range
  -fstrict-float-cast-overflow
                          Assume that overflowing float-to-int casts are undefined (default)
  -fstrict-vtable-pointers
                          Enable optimizations based on the strict rules for overwriting polymorphic C++ objects
  -fswift-async-fp=<option>
                          Control emission of Swift async extended frame info (option: auto, always, never)
  -fsycl                  Enables SYCL kernels compilation for device
  -fsystem-module         Build this module as a system module. Only used with -emit-module
  -ftarget-variant-availability-checks
                          Enable availability checks for the target variant platform
  -fthin-link-bitcode=<value>
                          Write minimized bitcode to <file> for the ThinLTO thin link only
  -fthinlto-index=<value> Perform ThinLTO importing using provided function summary index
  -ftime-report=<value>   (For new pass manager) "per-pass": one report for each pass; "per-pass-run": one report for each pass invocation
  -ftime-trace-granularity=<value>
                          Minimum time granularity (in microseconds) traced by time profiler
  -ftime-trace            Turn on time profiler. Generates JSON file based on output filename.
  -ftrap-function=<value> Issue call to specified function rather than a trap instruction
  -ftrapv-handler=<function name>
                          Specify the function to be called on overflow
  -ftrapv                 Trap on integer overflow
  -ftrigraphs             Process trigraph sequences
  -ftrivial-auto-var-init-skip-cpp-obj
                          do not auto-initialize objects initialized by a C++ constructor
  -ftrivial-auto-var-init-skip-non-pod
                          do not auto-initialize non-POD objects
  -ftrivial-auto-var-init-skip-non-ptr-array
                          do not auto-initialize arrays other than arrays of pointers
  -ftrivial-auto-var-init-skip-stl
                          do not auto-initialize variables in STL namespace
  -ftrivial-auto-var-init-stop-after=<value>
                          Stop initializing trivial automatic stack variables after the specified number of instances
  -ftrivial-auto-var-init=<value>
                          Initialize trivial automatic stack variables: uninitialized (default) | pattern
  -ftrivial-auto-var-zero-init-max-size=<value>
                          Zero initialize only first N bytes of each stack variable; 0 value turns off the limit.
  -funique-basic-block-section-names
                          Use unique names for basic block sections (ELF Only)
  -funique-internal-linkage-names
                          Uniqueify Internal Linkage Symbol Names by appending the MD5 hash of the module path
  -funroll-loops          Turn on loop unroller
  -fuse-cuid=<value>      Method to generate ID's for compilation units for single source offloading languages CUDA and HIP: 'hash' (ID's generated by hashing file path and command line options) | 'random' (ID's generated as random numbers) | 'none' (disabled). Default is 'hash'. This option will be overridden by option '-cuid=[ID]' if it is specified.
  -fuse-line-directives   Use #line in preprocessed output
  -fvalidate-ast-input-files-content
                          Compute and store the hash of input files used to build an AST. Files with mismatching mtime's are considered valid if both contents is identical
  -fveclib=<value>        Use the given vector functions library
  -fvectorize             Enable the loop vectorization passes
  -fverbose-asm           Generate verbose assembly output
  -fvirtual-function-elimination
                          Enables dead virtual function elimination optimization. Requires -flto=full
  -fvisibility-dllexport=<value>
                          The visibility for dllexport definitions [-fvisibility-from-dllstorageclass]
  -fvisibility-externs-dllimport=<value>
                          The visibility for dllimport external declarations [-fvisibility-from-dllstorageclass]
  -fvisibility-externs-nodllstorageclass=<value>
                          The visibility for external declarations without an explicit DLL dllstorageclass [-fvisibility-from-dllstorageclass]
  -fvisibility-from-dllstorageclass
                          Set the visibility of symbols in the generated code from their DLL storage class
  -fvisibility-global-new-delete-hidden
                          Give global C++ operator new and delete declarations hidden visibility
  -fvisibility-inlines-hidden-static-local-var
                          When -fvisibility-inlines-hidden is enabled, static variables in inline C++ member functions will also be given hidden visibility by default
  -fvisibility-inlines-hidden
                          Give inline C++ member functions hidden visibility by default
  -fvisibility-ms-compat  Give global types 'default' visibility and global functions and variables 'hidden' visibility by default
  -fvisibility-nodllstorageclass=<value>
                          The visibility for defintiions without an explicit DLL export class [-fvisibility-from-dllstorageclass]
  -fvisibility=<value>    Set the default symbol visibility for all global declarations
  -fwasm-exceptions       Use WebAssembly style exceptions
  -fwhole-program-vtables Enables whole-program vtable optimization. Requires -flto
  -fwrapv                 Treat signed integer overflow as two's complement
  -fwritable-strings      Store string literals as writable data
  -fxl-pragma-pack        Enable IBM XL #pragma pack handling
  -fxray-always-emit-customevents
                          Always emit __xray_customevent(...) calls even if the containing function is not always instrumented
  -fxray-always-emit-typedevents
                          Always emit __xray_typedevent(...) calls even if the containing function is not always instrumented
  -fxray-always-instrument= <value>
                          DEPRECATED: Filename defining the whitelist for imbuing the 'always instrument' XRay attribute.
  -fxray-attr-list= <value>
                          Filename defining the list of functions/types for imbuing XRay attributes.
  -fxray-function-groups=<value>
                          Only instrument 1 of N groups
  -fxray-ignore-loops     Don't instrument functions with loops unless they also meet the minimum function size
  -fxray-instruction-threshold= <value>
                          Sets the minimum function size to instrument with XRay
  -fxray-instrumentation-bundle= <value>
                          Select which XRay instrumentation points to emit. Options: all, none, function-entry, function-exit, function, custom. Default is 'all'.  'function' includes both 'function-entry' and 'function-exit'.
  -fxray-instrument       Generate XRay instrumentation sleds on function entry and exit
  -fxray-link-deps        Tells clang to add the link dependencies for XRay.
  -fxray-modes= <value>   List of modes to link in by default into XRay instrumented binaries.
  -fxray-never-instrument= <value>
                          DEPRECATED: Filename defining the whitelist for imbuing the 'never instrument' XRay attribute.
  -fxray-selected-function-group=<value>
                          When using -fxray-function-groups, select which group of functions to instrument. Valid range is 0 to fxray-function-groups - 1
  -fzvector               Enable System z vector language extension
  -F <value>              Add directory to framework include search path
  --gcc-toolchain=<value> Search for GCC installation in the specified directory on targets which commonly use GCC. The directory usually contains 'lib{,32,64}/gcc{,-cross}/$triple' and 'include'. If specified, sysroot is skipped for GCC detection. Note: executables (e.g. ld) used by the compiler are not overridden by the selected GCC installation
  -gcodeview-ghash        Emit type record hashes in a .debug$H section
  -gcodeview              Generate CodeView debug information
  -gdwarf-2               Generate source-level debug information with dwarf version 2
  -gdwarf-3               Generate source-level debug information with dwarf version 3
  -gdwarf-4               Generate source-level debug information with dwarf version 4
  -gdwarf-5               Generate source-level debug information with dwarf version 5
  -gdwarf32               Enables DWARF32 format for ELF binaries, if debug information emission is enabled.
  -gdwarf64               Enables DWARF64 format for ELF binaries, if debug information emission is enabled.
  -gdwarf                 Generate source-level debug information with the default dwarf version
  -gembed-source          Embed source text in DWARF debug sections
  -gline-directives-only  Emit debug line info directives only
  -gline-tables-only      Emit debug line number tables only
  -gmodules               Generate debug info with external references to clang modules or precompiled headers
  -gno-embed-source       Restore the default behavior of not embedding source text in DWARF debug sections
  -gno-inline-line-tables Don't emit inline line tables.
  --gpu-bundle-output     Bundle output files of HIP device compilation
  --gpu-instrument-lib=<value>
                          Instrument device library for HIP, which is a LLVM bitcode containing __cyg_profile_func_enter and __cyg_profile_func_exit
  --gpu-max-threads-per-block=<value>
                          Default max threads per block for kernel launch bounds for HIP
  -gsplit-dwarf=<value>   Set DWARF fission mode to either 'split' or 'single'
  -gz=<value>             DWARF debug sections compression type
  -G <size>               Put objects of at most <size> bytes into small data section (MIPS / Hexagon)
  -g                      Generate source-level debug information
  --help-hidden           Display help for hidden options
  -help                   Display available options
  --hip-device-lib=<value>
                          HIP device library
  --hip-link              Link clang-offload-bundler bundles for HIP
  --hip-path=<value>      HIP runtime installation path, used for finding HIP version and adding HIP include path.
  --hip-version=<value>   HIP version in the format of major.minor.patch
  -H                      Show header includes and nesting depth
  -I-                     Restrict all prior -I flags to double-quoted inclusion and remove current directory from include path
  -iapinotes-modules <directory>
                          Add directory to the API notes search path referenced by module name
  -iapinotes-path <file>  Include API notes file
  -ibuiltininc            Enable builtin #include directories even when -nostdinc is used before or after -ibuiltininc. Using -nobuiltininc after the option disables it
  -idirafter <value>      Add directory to AFTER include search path
  -iframeworkwithsysroot <directory>
                          Add directory to SYSTEM framework search path, absolute paths are relative to -isysroot
  -iframework <value>     Add directory to SYSTEM framework search path
  -imacros <file>         Include macros from file before parsing
  -include-pch <file>     Include precompiled header file
  -include <file>         Include file before parsing
  -index-header-map       Make the next included directory (-I or -F) an indexer header map
  -index-ignore-macros    Ignore macros during indexing
  -index-ignore-pcms      Ignore symbols from imported pcm modules
  -index-ignore-system-symbols
                          Ignore symbols from system headers
  -index-record-codegen-name
                          Record the codegen name for symbols
  -index-store-path <value>
                          Enable indexing with the specified data store path
  -index-unit-output-path <path>
                          Use <path> as the output path for this compilation unit in the index unit file
  -iprefix <dir>          Set the -iwithprefix/-iwithprefixbefore prefix
  -iquote <directory>     Add directory to QUOTE include search path
  -isysroot <dir>         Set the system root directory (usually /)
  -isystem-after <directory>
                          Add directory to end of the SYSTEM include search path
  -isystem <directory>    Add directory to SYSTEM include search path
  -ivfsoverlay <value>    Overlay the virtual filesystem described by file over the real file system
  -iwithprefixbefore <dir>
                          Set directory to include search path with prefix
  -iwithprefix <dir>      Set directory to SYSTEM include search path with prefix
  -iwithsysroot <directory>
                          Add directory to SYSTEM include search path, absolute paths are relative to -isysroot
  -I <dir>                Add directory to the end of the list of include search paths
  --libomptarget-amdgcn-bc-path=<value>
                          Path to libomptarget-amdgcn bitcode library
  --libomptarget-nvptx-bc-path=<value>
                          Path to libomptarget-nvptx bitcode library
  -L <dir>                Add directory to library search path
  -mabi=vec-default       Enable the default Altivec ABI on AIX (AIX only). Uses only volatile vector registers.
  -mabi=vec-extabi        Enable the extended Altivec ABI on AIX (AIX only). Uses volatile and nonvolatile vector registers
  -mabicalls              Enable SVR4-style position-independent code (Mips only)
  -maix-struct-return     Return all structs in memory (PPC32 only)
  -malign-branch-boundary=<value>
                          Specify the boundary's size to align branches
  -malign-branch=<value>  Specify types of branches to align
  -malign-double          Align doubles to two words in structs (x86 only)
  -mamdgpu-ieee           Sets the IEEE bit in the expected default floating point  mode register. Floating point opcodes that support exception flag gathering quiet and propagate signaling NaN inputs per IEEE 754-2008. This option changes the ABI. (AMDGPU only)
  -mbackchain             Link stack frames through backchain on System Z
  -mbranch-protection=<value>
                          Enforce targets of indirect branches and function returns
  -mbranches-within-32B-boundaries
                          Align selected branches (fused, jcc, jmp) within 32-byte boundary
  -mcmodel=medany         Equivalent to -mcmodel=medium, compatible with RISC-V gcc.
  -mcmodel=medlow         Equivalent to -mcmodel=small, compatible with RISC-V gcc.
  -mcmse                  Allow use of CMSE (Armv8-M Security Extensions)
  -mcode-object-v3        Legacy option to specify code object ABI V3 (AMDGPU only)
  -mcode-object-version=<version>
                          Specify code object ABI version. Defaults to 3. (AMDGPU only)
  -mcrc                   Allow use of CRC instructions (ARM/Mips only)
  -mcumode                Specify CU wavefront execution mode (AMDGPU only)
  -mdouble=<value>        Force double to be 32 bits or 64 bits
  -MD                     Write a depfile containing user and system headers
  -meabi <value>          Set EABI type, e.g. 4, 5 or gnu (default depends on triple)
  -membedded-data         Place constants in the .rodata section instead of the .sdata section even if they meet the -G <size> threshold (MIPS)
  -menable-experimental-extensions
                          Enable use of experimental RISC-V extensions.
  -menable-unsafe-fp-math Allow unsafe floating-point math optimizations which may decrease precision
  -mexec-model=<value>    Execution model (WebAssembly only)
  -mexecute-only          Disallow generation of data access to code sections (ARM only)
  -mextern-sdata          Assume that externally defined data is in the small data if it meets the -G <size> threshold (MIPS)
  -mfentry                Insert calls to fentry at function entry (x86/SystemZ only)
  -mfix-cmse-cve-2021-35465
                          Work around VLLDM erratum CVE-2021-35465 (ARM only)
  -mfix-cortex-a53-835769 Workaround Cortex-A53 erratum 835769 (AArch64 only)
  -mfp32                  Use 32-bit floating point registers (MIPS only)
  -mfp64                  Use 64-bit floating point registers (MIPS only)
  -MF <file>              Write depfile output from -MMD, -MD, -MM, or -M to <file>
  -mgeneral-regs-only     Generate code which only uses the general purpose registers (AArch64/x86 only)
  -mglobal-merge          Enable merging of globals
  -mgpopt                 Use GP relative accesses for symbols known to be in a small data section (MIPS)
  -MG                     Add missing headers to depfile
  -mharden-sls=<value>    Select straight-line speculation hardening scope
  -mhvx-length=<value>    Set Hexagon Vector Length
  -mhvx=<value>           Enable Hexagon Vector eXtensions
  -mhvx                   Enable Hexagon Vector eXtensions
  -miamcu                 Use Intel MCU ABI
  -mignore-xcoff-visibility
                          Not emit the visibility attribute for asm in AIX OS or give all symbols 'unspecified' visibility in XCOFF object file
  --migrate               Run the migrator
  -mincremental-linker-compatible
                          (integrated-as) Emit an object file which can be used with an incremental linker
  -mindirect-jump=<value> Change indirect jump instructions to inhibit speculation
  -mios-version-min=<value>
                          Set iOS deployment target
  -MJ <value>             Write a compilation database entry per input
  -mllvm <value>          Additional arguments to forward to LLVM's option processing
  -mlocal-sdata           Extend the -G behaviour to object local data (MIPS)
  -mlong-calls            Generate branches with extended addressability, usually via indirect jumps.
  -mlong-double-128       Force long double to be 128 bits
  -mlong-double-64        Force long double to be 64 bits
  -mlong-double-80        Force long double to be 80 bits, padded to 128 bits for storage
  -mlvi-cfi               Enable only control-flow mitigations for Load Value Injection (LVI)
  -mlvi-hardening         Enable all mitigations for Load Value Injection (LVI)
  -mmacosx-version-min=<value>
                          Set Mac OS X deployment target
  -mmadd4                 Enable the generation of 4-operand madd.s, madd.d and related instructions.
  -mmark-bti-property     Add .note.gnu.property with BTI to assembly files (AArch64 only)
  -MMD                    Write a depfile containing user headers
  -mmemops                Enable generation of memop instructions
  -mms-bitfields          Set the default structure layout to be compatible with the Microsoft compiler standard
  -mmsa                   Enable MSA ASE (MIPS only)
  -mmt                    Enable MT ASE (MIPS only)
  -MM                     Like -MMD, but also implies -E and writes to stdout by default
  -mno-abicalls           Disable SVR4-style position-independent code (Mips only)
  -mno-code-object-v3     Legacy option to specify code object ABI V2 (AMDGPU only)
  -mno-crc                Disallow use of CRC instructions (Mips only)
  -mno-cumode             Specify WGP wavefront execution mode (AMDGPU only)
  -mno-embedded-data      Do not place constants in the .rodata section instead of the .sdata if they meet the -G <size> threshold (MIPS)
  -mno-execute-only       Allow generation of data access to code sections (ARM only)
  -mno-extern-sdata       Do not assume that externally defined data is in the small data if it meets the -G <size> threshold (MIPS)
  -mno-fix-cmse-cve-2021-35465
                          Don't work around VLLDM erratum CVE-2021-35465 (ARM only)
  -mno-fix-cortex-a53-835769
                          Don't workaround Cortex-A53 erratum 835769 (AArch64 only)
  -mno-global-merge       Disable merging of globals
  -mno-gpopt              Do not use GP relative accesses for symbols known to be in a small data section (MIPS)
  -mno-hvx                Disable Hexagon Vector eXtensions
  -mno-implicit-float     Don't generate implicit floating point instructions
  -mno-incremental-linker-compatible
                          (integrated-as) Emit an object file which cannot be used with an incremental linker
  -mno-local-sdata        Do not extend the -G behaviour to object local data (MIPS)
  -mno-long-calls         Restore the default behaviour of not generating long calls
  -mno-lvi-cfi            Disable control-flow mitigations for Load Value Injection (LVI)
  -mno-lvi-hardening      Disable mitigations for Load Value Injection (LVI)
  -mno-madd4              Disable the generation of 4-operand madd.s, madd.d and related instructions.
  -mno-memops             Disable generation of memop instructions
  -mno-movt               Disallow use of movt/movw pairs (ARM only)
  -mno-ms-bitfields       Do not set the default structure layout to be compatible with the Microsoft compiler standard
  -mno-msa                Disable MSA ASE (MIPS only)
  -mno-mt                 Disable MT ASE (MIPS only)
  -mno-neg-immediates     Disallow converting instructions with negative immediates to their negation or inversion.
  -mno-nvj                Disable generation of new-value jumps
  -mno-nvs                Disable generation of new-value stores
  -mno-outline-atomics    Don't generate local calls to out-of-line atomic operations
  -mno-outline            Disable function outlining (AArch64 only)
  -mno-packets            Disable generation of instruction packets
  -mno-relax              Disable linker relaxation
  -mno-restrict-it        Allow generation of deprecated IT blocks for ARMv8. It is off by default for ARMv8 Thumb mode
  -mno-save-restore       Disable using library calls for save and restore
  -mno-seses              Disable speculative execution side effect suppression (SESES)
  -mno-stack-arg-probe    Disable stack probes which are enabled by default
  -mno-tgsplit            Disable threadgroup split execution mode (AMDGPU only)
  -mno-tls-direct-seg-refs
                          Disable direct TLS access through segment registers
  -mno-unaligned-access   Force all memory accesses to be aligned (AArch32/AArch64 only)
  -mno-wavefrontsize64    Specify wavefront size 32 mode (AMDGPU only)
  -mnocrc                 Disallow use of CRC instructions (ARM only)
  -mnop-mcount            Generate mcount/__fentry__ calls as nops. To activate they need to be patched in.
  -mnvj                   Enable generation of new-value jumps
  -mnvs                   Enable generation of new-value stores
  -module-dependency-dir <value>
                          Directory to dump module dependencies to
  -module-file-info       Provide information about a particular module file
  -momit-leaf-frame-pointer
                          Omit frame pointer setup for leaf functions
  -moutline-atomics       Generate local calls to out-of-line atomic operations
  -moutline               Enable function outlining (AArch64 only)
  -mpacked-stack          Use packed stack layout (SystemZ only).
  -mpackets               Enable generation of instruction packets
  -mpad-max-prefix-size=<value>
                          Specify maximum number of prefixes to use for padding
  -mprefer-vector-width=<value>
                          Specifies preferred vector width for auto-vectorization. Defaults to 'none' which allows target specific decisions.
  -MP                     Create phony target for each dependency (other than main file)
  -mqdsp6-compat          Enable hexagon-qdsp6 backward compatibility
  -MQ <value>             Specify name of main file output to quote in depfile
  -mrecord-mcount         Generate a __mcount_loc section entry for each __fentry__ call.
  -mrelax-all             (integrated-as) Relax all machine instructions
  -mrelax                 Enable linker relaxation
  -mrestrict-it           Disallow generation of deprecated IT blocks for ARMv8. It is on by default for ARMv8 Thumb mode.
  -mrtd                   Make StdCall calling convention the default
  -msave-restore          Enable using library calls for save and restore
  -mseses                 Enable speculative execution side effect suppression (SESES). Includes LVI control flow integrity mitigations
  -msign-return-address=<value>
                          Select return address signing scope
  -msmall-data-limit=<value>
                          Put global and static data smaller than the limit into a special section
  -msoft-float            Use software floating point
  -mstack-alignment=<value>
                          Set the stack alignment
  -mstack-arg-probe       Enable stack probes
  -mstack-probe-size=<value>
                          Set the stack probe size
  -mstack-protector-guard-offset=<value>
                          Use the given offset for addressing the stack-protector guard
  -mstack-protector-guard-reg=<value>
                          Use the given reg for addressing the stack-protector guard
  -mstack-protector-guard=<value>
                          Use the given guard (global, tls) for addressing the stack-protector guard
  -mstackrealign          Force realign the stack at entry to every function
  -msve-vector-bits=<value>
                          Specify the size in bits of an SVE vector register. Defaults to the vector length agnostic value of "scalable". (AArch64 only)
  -msvr4-struct-return    Return small structs in registers (PPC32 only)
  -mtargetos=<value>      Set the deployment target to be the specified OS and OS version
  -mtgsplit               Enable threadgroup split execution mode (AMDGPU only)
  -mthread-model <value>  The thread model to use, e.g. posix, single (posix by default)
  -mtls-direct-seg-refs   Enable direct TLS access through segment registers (default)
  -mtls-size=<value>      Specify bit size of immediate TLS offsets (AArch64 ELF only): 12 (for 4KB) | 24 (for 16MB, default) | 32 (for 4GB) | 48 (for 256TB, needs -mcmodel=large)
  -mtp=<value>            Thread pointer access method (AArch32/AArch64 only)
  -mtune=<value>          Only supported on X86 and RISC-V. Otherwise accepted for compatibility with GCC.
  -MT <value>             Specify name of main file output in depfile
  -munaligned-access      Allow memory accesses to be unaligned (AArch32/AArch64 only)
  -munsafe-fp-atomics     Enable unsafe floating point atomic instructions (AMDGPU only)
  -mvscale-max=<value>    Specify the vscale maximum. Defaults to the vector length agnostic value of "0". (AArch64 only)
  -mvscale-min=<value>    Specify the vscale minimum. Defaults to the vector length agnostic value of "0". (AArch64 only)
  -MV                     Use NMake/Jom format for the depfile
  -mwavefrontsize64       Specify wavefront size 64 mode (AMDGPU only)
  -M                      Like -MD, but also implies -E and writes to stdout by default
  --no-cuda-include-ptx=<value>
                          Do not include PTX for the following GPU architecture (e.g. sm_35) or 'all'. May be specified more than once.
  --no-cuda-version-check Don't error out if the detected version of the CUDA install is too low for the requested CUDA gpu architecture.
  --no-gpu-bundle-output  Do not bundle output files of HIP device compilation
  --no-offload-arch=<value>
                          Remove CUDA/HIP offloading device architecture (e.g. sm_35, gfx906) from the list of devices to compile for. 'all' resets the list to its default value.
  --no-system-header-prefix=<prefix>
                          Treat all #include paths starting with <prefix> as not including a system header.
  -nobuiltininc           Disable builtin #include directories
  -nogpuinc               Do not add include paths for CUDA/HIP and do not include the default CUDA/HIP wrapper headers
  -nogpulib               Do not link device library for CUDA/HIP device compilation
  -nostdinc++             Disable standard #include directories for the C++ standard library
  -ObjC++                 Treat source input files as Objective-C++ inputs
  -objcmt-atomic-property Make migration to 'atomic' properties
  -objcmt-migrate-all     Enable migration to modern ObjC
  -objcmt-migrate-annotation
                          Enable migration to property and method annotations
  -objcmt-migrate-designated-init
                          Enable migration to infer NS_DESIGNATED_INITIALIZER for initializer methods
  -objcmt-migrate-instancetype
                          Enable migration to infer instancetype for method result type
  -objcmt-migrate-literals
                          Enable migration to modern ObjC literals
  -objcmt-migrate-ns-macros
                          Enable migration to NS_ENUM/NS_OPTIONS macros
  -objcmt-migrate-property-dot-syntax
                          Enable migration of setter/getter messages to property-dot syntax
  -objcmt-migrate-property
                          Enable migration to modern ObjC property
  -objcmt-migrate-protocol-conformance
                          Enable migration to add protocol conformance on classes
  -objcmt-migrate-readonly-property
                          Enable migration to modern ObjC readonly property
  -objcmt-migrate-readwrite-property
                          Enable migration to modern ObjC readwrite property
  -objcmt-migrate-subscripting
                          Enable migration to modern ObjC subscripting
  -objcmt-ns-nonatomic-iosonly
                          Enable migration to use NS_NONATOMIC_IOSONLY macro for setting property's 'atomic' attribute
  -objcmt-returns-innerpointer-property
                          Enable migration to annotate property with NS_RETURNS_INNER_POINTER
  -objcmt-whitelist-dir-path=<value>
                          Only modify files with a filename contained in the provided directory path
  -ObjC                   Treat source input files as Objective-C inputs
  --offload-arch=<value>  CUDA offloading device architecture (e.g. sm_35), or HIP offloading target ID in the form of a device architecture followed by target ID features delimited by a colon. Each target ID feature is a pre-defined string followed by a plus or minus sign (e.g. gfx908:xnack+:sramecc-).  May be specified more than once.
  -o <file>               Write output to <file>
  -pedantic               Warn on language extensions
  -pg                     Enable mcount instrumentation
  -pipe                   Use pipes between commands, when possible
  --precompile            Only precompile the input
  -print-effective-triple Print the effective target triple
  -print-file-name=<file> Print the full library path of <file>
  -print-ivar-layout      Enable Objective-C Ivar layout bitmap print trace
  -print-libgcc-file-name Print the library path for the currently used compiler runtime library ("libgcc.a" or "libclang_rt.builtins.*.a")
  -print-multiarch        Print the multiarch target triple
  -print-prog-name=<name> Print the full program path of <name>
  -print-resource-dir     Print the resource directory pathname
  -print-rocm-search-dirs Print the paths used for finding ROCm installation
  -print-runtime-dir      Print the directory pathname containing clangs runtime libraries
  -print-search-dirs      Print the paths used for finding libraries and programs
  -print-supported-cpus   Print supported cpu models for the given target (if target is not specified, it will print the supported cpus for the default target)
  -print-target-triple    Print the normalized target triple
  -print-targets          Print the registered targets
  -pthread                Support POSIX threads in generated code
  --ptxas-path=<value>    Path to ptxas (used for compiling CUDA code)
  -P                      Disable linemarker output in -E mode
  -Qn                     Do not emit metadata containing compiler name and version
  -Qunused-arguments      Don't emit warning for unused driver arguments
  -Qy                     Emit metadata containing compiler name and version
  -relocatable-pch        Whether to build a relocatable precompiled header
  -rewrite-legacy-objc    Rewrite Legacy Objective-C source to C++
  -rewrite-objc           Rewrite Objective-C source to C++
  --rocm-device-lib-path=<value>
                          ROCm device library path. Alternative to rocm-path.
  --rocm-path=<value>     ROCm installation path, used for finding and automatically linking required bitcode libraries.
  -Rpass-analysis=<value> Report transformation analysis from optimization passes whose name matches the given POSIX regular expression
  -Rpass-missed=<value>   Report missed transformations by optimization passes whose name matches the given POSIX regular expression
  -Rpass=<value>          Report transformations performed by optimization passes whose name matches the given POSIX regular expression
  -rtlib=<value>          Compiler runtime library to use
  -R<remark>              Enable the specified remark
  -save-stats=<value>     Save llvm statistics.
  -save-stats             Save llvm statistics.
  -save-temps=<value>     Save intermediate compilation results.
  -save-temps             Save intermediate compilation results
  -serialize-diagnostics <value>
                          Serialize compiler diagnostics to a file
  -shared-libsan          Dynamically link the sanitizer runtime
  -static-libsan          Statically link the sanitizer runtime
  -static-openmp          Use the static host OpenMP runtime while linking.
  -std=<value>            Language standard to compile for
  -stdlib++-isystem <directory>
                          Use directory as the C++ standard library include path
  -stdlib=<value>         C++ standard library to use
  -sycl-std=<value>       SYCL language standard to compile for.
  --system-header-prefix=<prefix>
                          Treat all #include paths starting with <prefix> as including a system header.
  -S                      Only run preprocess and compilation steps
  -target-variant <value> Generate code that may run on a particular variant of the deployment target
  --target=<value>        Generate code for the given target
  -Tbss <addr>            Set starting address of BSS to <addr>
  -Tdata <addr>           Set starting address of DATA to <addr>
  -time                   Time individual commands
  -traditional-cpp        Enable some traditional CPP emulation
  -trigraphs              Process trigraph sequences
  -Ttext <addr>           Set starting address of TEXT to <addr>
  -T <script>             Specify <script> as linker script
  -undef                  undef all system defines
  -unwindlib=<value>      Unwind library to use
  -U <macro>              Undefine macro <macro>
  --verify-debug-info     Verify the binary representation of debug output
  -verify-pch             Load and verify that a pre-compiled header file is not stale
  --version               Print version information
  -v                      Show commands to run and use verbose output
  -Wa,<arg>               Pass the comma separated arguments in <arg> to the assembler
  -Wdeprecated            Enable warnings for deprecated constructs and define __DEPRECATED
  -Wl,<arg>               Pass the comma separated arguments in <arg> to the linker
  -working-directory <value>
                          Resolve file paths relative to the specified directory
  -Wp,<arg>               Pass the comma separated arguments in <arg> to the preprocessor
  -W<warning>             Enable the specified warning
  -w                      Suppress all warnings
  -Xanalyzer <arg>        Pass <arg> to the static analyzer
  -Xarch_device <arg>     Pass <arg> to the CUDA/HIP device compilation
  -Xarch_host <arg>       Pass <arg> to the CUDA/HIP host compilation
  -Xassembler <arg>       Pass <arg> to the assembler
  -Xclang <arg>           Pass <arg> to the clang compiler
  -Xcuda-fatbinary <arg>  Pass <arg> to fatbinary invocation
  -Xcuda-ptxas <arg>      Pass <arg> to the ptxas assembler
  -Xlinker <arg>          Pass <arg> to the linker
  -Xopenmp-target=<triple> <arg>
                          Pass <arg> to the target offloading toolchain identified by <triple>.
  -Xopenmp-target <arg>   Pass <arg> to the target offloading toolchain.
  -Xpreprocessor <arg>    Pass <arg> to the preprocessor
  -x <language>           Treat subsequent input files as having type <language>
  -z <arg>                Pass -z <arg> to the linker
wuyujin1997@mac11 ~ % 
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man cc 在手册(manual)中查看cc的用法

wuyujin1997@mac11 test % man cc
Unknown locale, assuming C
CLANG(1)                             Clang                            CLANG(1)

NAME
       clang - the Clang C, C++, and Objective-C compiler

SYNOPSIS
       clang [options] filename ...

DESCRIPTION
       clang is a C, C++, and Objective-C compiler which encompasses
       preprocessing, parsing, optimization, code generation, assembly, and
       linking.  Depending on which high-level mode setting is passed, Clang
       will stop before doing a full link.  While Clang is highly integrated,
       it is important to understand the stages of compilation, to understand
       how to invoke it.  These stages are:

       Driver The clang executable is actually a small driver which controls
              the overall execution of other tools such as the compiler,
              assembler and linker.  Typically you do not need to interact
              with the driver, but you transparently use it to run the other
              tools.

       Preprocessing
:...skipping...
CLANG(1)                             Clang                            CLANG(1)

NAME
       clang - the Clang C, C++, and Objective-C compiler

SYNOPSIS
       clang [options] filename ...

DESCRIPTION
       clang is a C, C++, and Objective-C compiler which encompasses
       preprocessing, parsing, optimization, code generation, assembly, and
       linking.  Depending on which high-level mode setting is passed, Clang
       will stop before doing a full link.  While Clang is highly integrated,
       it is important to understand the stages of compilation, to understand
       how to invoke it.  These stages are:

       Driver The clang executable is actually a small driver which controls
              the overall execution of other tools such as the compiler,
              assembler and linker.  Typically you do not need to interact
              with the driver, but you transparently use it to run the other
              tools.

       Preprocessing
              This stage handles tokenization of the input source file, macro
:...skipping...
CLANG(1)                             Clang                            CLANG(1)

NAME
       clang - the Clang C, C++, and Objective-C compiler

SYNOPSIS
       clang [options] filename ...

DESCRIPTION
       clang is a C, C++, and Objective-C compiler which encompasses
       preprocessing, parsing, optimization, code generation, assembly, and
       linking.  Depending on which high-level mode setting is passed, Clang
       will stop before doing a full link.  While Clang is highly integrated,
       it is important to understand the stages of compilation, to understand
       how to invoke it.  These stages are:

       Driver The clang executable is actually a small driver which controls
              the overall execution of other tools such as the compiler,
              assembler and linker.  Typically you do not need to interact
              with the driver, but you transparently use it to run the other
              tools.

       Preprocessing
              This stage handles tokenization of the input source file, macro
              expansion, #include expansion and handling of other preprocessor
              directives.  The output of this stage is typically called a ".i"
              (for C), ".ii" (for C++), ".mi" (for Objective-C), or ".mii"
              (for Objective-C++) file.

       Parsing and Semantic Analysis
              This stage parses the input file, translating preprocessor
              tokens into a parse tree.  Once in the form of a parse tree, it
              applies semantic analysis to compute types for expressions as
              well and determine whether the code is well formed. This stage
              is responsible for generating most of the compiler warnings as
              well as parse errors. The output of this stage is an "Abstract
              Syntax Tree" (AST).

       Code Generation and Optimization
              This stage translates an AST into low-level intermediate code
              (known as "LLVM IR") and ultimately to machine code.  This phase
              is responsible for optimizing the generated code and handling
              target-specific code generation.  The output of this stage is
              typically called a ".s" file or "assembly" file.

              Clang also supports the use of an integrated assembler, in which
              the code generator produces object files directly. This avoids
              the overhead of generating the ".s" file and of calling the
              target assembler.

       Assembler
              This stage runs the target assembler to translate the output of
              the compiler into a target object file. The output of this stage
              is typically called a ".o" file or "object" file.

       Linker This stage runs the target linker to merge multiple object files
              into an executable or dynamic library. The output of this stage
              is typically called an "a.out", ".dylib" or ".so" file.

       Clang Static Analyzer

       The Clang Static Analyzer is a tool that scans source code to try to
       find bugs through code analysis.  This tool uses many parts of Clang
       and is built into the same driver.  Please see
       <https://clang-analyzer.llvm.org> for more details on how to use the
       static analyzer.

OPTIONS
   Stage Selection Options

       -E     Run the preprocessor stage.

       -fsyntax-only
              Run the preprocessor, parser and type checking stages.

       -S     Run the previous stages as well as LLVM generation and
              optimization stages and target-specific code generation,
              producing an assembly file.

       -c     Run all of the above, plus the assembler, generating a target
              ".o" object file.

       no stage selection option
              If no stage selection option is specified, all stages above are
              run, and the linker is run to combine the results into an
              executable or shared library.

   Language Selection and Mode Options

       -x <language>
              Treat subsequent input files as having type language.

       -std=<standard>
              Specify the language standard to compile for.

              Supported values for the C language are:
                 c89
                 c90
                 iso9899:1990

                    ISO C 1990
                 iso9899:199409

                    ISO C 1990 with amendment 1
                 gnu89
                 gnu90

                    ISO C 1990 with GNU extensions
                 c99
                 iso9899:1999

                    ISO C 1999
                 gnu99

                    ISO C 1999 with GNU extensions
                 c11
                 iso9899:2011

                    ISO C 2011
                 gnu11

                    ISO C 2011 with GNU extensions
                 c17
                 iso9899:2017

                    ISO C 2017
                 gnu17

                    ISO C 2017 with GNU extensions

              The default C language standard is gnu17, except on PS4, where
              it is gnu99.

              Supported values for the C++ language are:
                 c++98
                 c++03

                    ISO C++ 1998 with amendments
                 gnu++98
                 gnu++03

                    ISO C++ 1998 with amendments and GNU extensions
                 c++11

                    ISO C++ 2011 with amendments
                 gnu++11

                    ISO C++ 2011 with amendments and GNU extensions
                 c++14

                    ISO C++ 2014 with amendments
                 gnu++14

                    ISO C++ 2014 with amendments and GNU extensions
                 c++17

                    ISO C++ 2017 with amendments
                 gnu++17

                    ISO C++ 2017 with amendments and GNU extensions
                 c++2a

                    Working draft for ISO C++ 2020
                 gnu++2a

                    Working draft for ISO C++ 2020 with GNU extensions

              The default C++ language standard is gnu++14.

              Supported values for the OpenCL language are:
                 cl1.0

                    OpenCL 1.0
                 cl1.1

                    OpenCL 1.1
                 cl1.2

                    OpenCL 1.2
                 cl2.0

                    OpenCL 2.0

              The default OpenCL language standard is cl1.0.

              Supported values for the CUDA language are:
                 cuda

                    NVIDIA CUDA(tm)

       -stdlib=<library>
              Specify the C++ standard library to use; supported options are
              libstdc++ and libc++. If not specified, platform default will be
              used.

       -rtlib=<library>
              Specify the compiler runtime library to use; supported options
              are libgcc and compiler-rt. If not specified, platform default
              will be used.

       -ansi  Same as -std=c89.

       -ObjC, -ObjC++
              Treat source input files as Objective-C and Object-C++ inputs
              respectively.

       -trigraphs
              Enable trigraphs.

       -ffreestanding
              Indicate that the file should be compiled for a freestanding,
              not a hosted, environment. Note that it is assumed that a
              freestanding environment will additionally provide memcpy,
              memmove, memset and memcmp implementations, as these are needed
              for efficient codegen for many programs.

       -fno-builtin
              Disable special handling and optimizations of builtin functions
              like strlen() and malloc().

       -fmath-errno
              Indicate that math functions should be treated as updating
              errno.

       -fpascal-strings
              Enable support for Pascal-style strings with "\pfoo".

       -fms-extensions
              Enable support for Microsoft extensions.

       -fmsc-version=
              Set _MSC_VER. Defaults to 1300 on Windows. Not set otherwise.

       -fborland-extensions
              Enable support for Borland extensions.

       -fwritable-strings
              Make all string literals default to writable.  This disables
              uniquing of strings and other optimizations.

       -flax-vector-conversions, -flax-vector-conversions=<kind>,
       -fno-lax-vector-conversions
              Allow loose type checking rules for implicit vector conversions.
              Possible values of <kind>:

              • none: allow no implicit conversions between vectors

              • integer: allow implicit bitcasts between integer vectors of
                the same overall bit-width

              • all: allow implicit bitcasts between any vectors of the same
                overall bit-width

              <kind> defaults to integer if unspecified.

       -fblocks
              Enable the "Blocks" language feature.

       -fobjc-abi-version=version
              Select the Objective-C ABI version to use. Available versions
              are 1 (legacy "fragile" ABI), 2 (non-fragile ABI 1), and 3
              (non-fragile ABI 2).

       -fobjc-nonfragile-abi-version=<version>
              Select the Objective-C non-fragile ABI version to use by
              default. This will only be used as the Objective-C ABI when the
              non-fragile ABI is enabled (either via -fobjc-nonfragile-abi, or
              because it is the platform default).

       -fobjc-nonfragile-abi, -fno-objc-nonfragile-abi
              Enable use of the Objective-C non-fragile ABI. On platforms for
              which this is the default ABI, it can be disabled with
              -fno-objc-nonfragile-abi.

   Target Selection Options
       Clang fully supports cross compilation as an inherent part of its
       design.  Depending on how your version of Clang is configured, it may
       have support for a number of cross compilers, or may only support a
       native target.

       -arch <architecture>
              Specify the architecture to build for.

       -mmacosx-version-min=<version>
              When building for macOS, specify the minimum version supported
              by your application.

       -miphoneos-version-min
              When building for iPhone OS, specify the minimum version
              supported by your application.

       --print-supported-cpus
              Print out a list of supported processors for the given target
              (specified through --target=<architecture> or -arch
              <architecture>). If no target is specified, the system default
              target will be used.

       -mcpu=?, -mtune=?
              Acts as an alias for --print-supported-cpus.

       -march=<cpu>
              Specify that Clang should generate code for a specific processor
              family member and later.  For example, if you specify
              -march=i486, the compiler is allowed to generate instructions
              that are valid on i486 and later processors, but which may not
              exist on earlier ones.

   Code Generation Options

       -O0, -O1, -O2, -O3, -Ofast, -Os, -Oz, -Og, -O, -O4
              Specify which optimization level to use:
                 -O0 Means "no optimization": this level compiles the fastest
                 and generates the most debuggable code.

                 -O1 Somewhere between -O0 and -O2.

                 -O2 Moderate level of optimization which enables most
                 optimizations.

                 -O3 Like -O2, except that it enables optimizations that take
                 longer to perform or that may generate larger code (in an
                 attempt to make the program run faster).

                 -Ofast Enables all the optimizations from -O3 along with
                 other aggressive optimizations that may violate strict
                 compliance with language standards.

                 -Os Like -O2 with extra optimizations to reduce code size.

                 -Oz Like -Os (and thus -O2), but reduces code size further.

                 -Og Like -O1. In future versions, this option might disable
                 different optimizations in order to improve debuggability.

                 -O Equivalent to -O1.

                 -O4 and higher
                    Currently equivalent to -O3

       -g, -gline-tables-only, -gmodules
              Control debug information output.  Note that Clang debug
              information works best at -O0.  When more than one option
              starting with -g is specified, the last one wins:
                 -g Generate debug information.

                 -gline-tables-only Generate only line table debug
                 information. This allows for symbolicated backtraces with
                 inlining information, but does not include any information
                 about variables, their locations or types.

                 -gmodules Generate debug information that contains external
                 references to types defined in Clang modules or precompiled
                 headers instead of emitting redundant debug type information
                 into every object file.  This option transparently switches
                 the Clang module format to object file containers that hold
                 the Clang module together with the debug information.  When
                 compiling a program that uses Clang modules or precompiled
                 headers, this option produces complete debug information with
                 faster compile times and much smaller object files.

                 This option should not be used when building static libraries
                 for distribution to other machines because the debug info
                 will contain references to the module cache on the machine
                 the object files in the library were built on.

       -fstandalone-debug -fno-standalone-debug
              Clang supports a number of optimizations to reduce the size of
              debug information in the binary. They work based on the
              assumption that the debug type information can be spread out
              over multiple compilation units.  For instance, Clang will not
              emit type definitions for types that are not needed by a module
              and could be replaced with a forward declaration.  Further,
              Clang will only emit type info for a dynamic C++ class in the
              module that contains the vtable for the class.

              The -fstandalone-debug option turns off these optimizations.
              This is useful when working with 3rd-party libraries that don't
              come with debug information.  This is the default on Darwin.
              Note that Clang will never emit type information for types that
              are not referenced at all by the program.

       -feliminate-unused-debug-types
              By default, Clang does not emit type information for types that
              are defined but not used in a program. To retain the debug info
              for these unused types, the negation
              -fno-eliminate-unused-debug-types can be used.

       -fexceptions
              Enable generation of unwind information. This allows exceptions
              to be thrown through Clang compiled stack frames.  This is on by
              default in x86-64.

       -ftrapv
              Generate code to catch integer overflow errors.  Signed integer
              overflow is undefined in C. With this flag, extra code is
              generated to detect this and abort when it happens.

       -fvisibility
              This flag sets the default visibility level.

       -fcommon, -fno-common
              This flag specifies that variables without initializers get
              common linkage.  It can be disabled with -fno-common.

       -ftls-model=<model>
              Set the default thread-local storage (TLS) model to use for
              thread-local variables. Valid values are: "global-dynamic",
              "local-dynamic", "initial-exec" and "local-exec". The default is
              "global-dynamic". The default model can be overridden with the
              tls_model attribute. The compiler will try to choose a more
              efficient model if possible.

       -flto, -flto=full, -flto=thin, -emit-llvm
              Generate output files in LLVM formats, suitable for link time
              optimization.  When used with -S this generates LLVM
              intermediate language assembly files, otherwise this generates
              LLVM bitcode format object files (which may be passed to the
              linker depending on the stage selection options).

              The default for -flto is "full", in which the LLVM bitcode is
              suitable for monolithic Link Time Optimization (LTO), where the
              linker merges all such modules into a single combined module for
              optimization. With "thin", ThinLTO compilation is invoked
              instead.

              NOTE:
                 On Darwin, when using -flto along with -g and compiling and
                 linking in separate steps, you also need to pass
                 -Wl,-object_path_lto,<lto-filename>.o at the linking step to
                 instruct the ld64 linker not to delete the temporary object
                 file generated during Link Time Optimization (this flag is
                 automatically passed to the linker by Clang if compilation
                 and linking are done in a single step). This allows debugging
                 the executable as well as generating the .dSYM bundle using
                 dsymutil(1).

   Driver Options

       -###   Print (but do not run) the commands to run for this compilation.

       --help Display available options.

       -Qunused-arguments
              Do not emit any warnings for unused driver arguments.

       -Wa,<args>
              Pass the comma separated arguments in args to the assembler.

       -Wl,<args>
              Pass the comma separated arguments in args to the linker.

       -Wp,<args>
              Pass the comma separated arguments in args to the preprocessor.

       -Xanalyzer <arg>
              Pass arg to the static analyzer.

       -Xassembler <arg>
              Pass arg to the assembler.

       -Xlinker <arg>
              Pass arg to the linker.

       -Xpreprocessor <arg>
              Pass arg to the preprocessor.

       -o <file>
              Write output to file.

       -print-file-name=<file>
              Print the full library path of file.

       -print-libgcc-file-name
              Print the library path for the currently used compiler runtime
              library ("libgcc.a" or "libclang_rt.builtins.*.a").

       -print-prog-name=<name>
              Print the full program path of name.

       -print-search-dirs
              Print the paths used for finding libraries and programs.

       -save-temps
              Save intermediate compilation results.

       -save-stats, -save-stats=cwd, -save-stats=obj
              Save internal code generation (LLVM) statistics to a file in the
              current directory (-save-stats/"-save-stats=cwd") or the
              directory of the output file ("-save-state=obj").

       -integrated-as, -no-integrated-as
              Used to enable and disable, respectively, the use of the
              integrated assembler. Whether the integrated assembler is on by
              default is target dependent.

       -time  Time individual commands.

       -ftime-report
              Print timing summary of each stage of compilation.

       -v     Show commands to run and use verbose output.

   Diagnostics Options

       -fshow-column, -fshow-source-location, -fcaret-diagnostics,
       -fdiagnostics-fixit-info, -fdiagnostics-parseable-fixits,
       -fdiagnostics-print-source-range-info, -fprint-source-range-info,
       -fdiagnostics-show-option, -fmessage-length
              These options control how Clang prints out information about
              diagnostics (errors and warnings). Please see the Clang User's
              Manual for more information.

   Preprocessor Options

       -D<macroname>=<value>
              Adds an implicit #define into the predefines buffer which is
              read before the source file is preprocessed.

       -U<macroname>
              Adds an implicit #undef into the predefines buffer which is read
              before the source file is preprocessed.

       -include <filename>
              Adds an implicit #include into the predefines buffer which is
              read before the source file is preprocessed.

       -I<directory>
              Add the specified directory to the search path for include
              files.

       -F<directory>
              Add the specified directory to the search path for framework
              include files.

       -nostdinc
              Do not search the standard system directories or compiler
              builtin directories for include files.

       -nostdlibinc
              Do not search the standard system directories for include files,
              but do search compiler builtin include directories.

       -nobuiltininc
              Do not search clang's builtin directory for include files.

ENVIRONMENT

       TMPDIR, TEMP, TMP
              These environment variables are checked, in order, for the
              location to write temporary files used during the compilation
              process.

       CPATH  If this environment variable is present, it is treated as a
              delimited list of paths to be added to the default system
              include path list. The delimiter is the platform dependent
              delimiter, as used in the PATH environment variable.

              Empty components in the environment variable are ignored.

       C_INCLUDE_PATH, OBJC_INCLUDE_PATH, CPLUS_INCLUDE_PATH,
       OBJCPLUS_INCLUDE_PATH
              These environment variables specify additional paths, as for
              CPATH, which are only used when processing the appropriate
              language.

       MACOSX_DEPLOYMENT_TARGET
              If -mmacosx-version-min is unspecified, the default deployment
              target is read from this environment variable. This option only
              affects Darwin targets.

BUGS
       To report bugs, please visit <https://bugs.llvm.org/>.  Most bug
       reports should include preprocessed source files (use the -E option)
       and the full output of the compiler, along with information to
       reproduce.

SEE ALSO
       as(1), ld(1)

AUTHOR
       Maintained by the Clang / LLVM Team (<http://clang.llvm.org>)

COPYRIGHT
       2007-2022, The Clang Team

Apple Clang 1400.0.29.202     September 16, 2022                      CLANG(1)
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