riscv-gnu-toolchain 交叉编译器如何构建？

安装依赖工具

sudo apt-get install git autoconf automake autotools-dev curl python3 libmpc-dev libmpfr-dev libgmp-dev gawk build-essential bison flex texinfo gperf patchutils bc libexpat-dev libglib2.0-dev ninja-build zlib1g-dev pkg-config libboost-all-dev libtool libssl-dev libpixman-1-dev libpython-dev virtualenv libmount-dev libsdl2-dev
1

工具链下载

开始下载 riscv-gnu-toolchain

git clone https://gitee.com/mirrors/riscv-gnu-toolchain
cd riscv-gnu-toolchain
1
2

下载 RISC-V 平台的 C 语言编译器源代码仓库

git clone -b riscv-gcc-10.2.0 https://gitee.com/mirrors/riscv-gcc
1

下载测试框架源代码仓库，即 riscv-dejagnu

git clone https://gitee.com/mirrors/riscv-dejagnu
1

下载 GNU 的 C 库源代码仓库，也就是 riscv-glibc

git clone -b riscv-glibc-2.29 https://gitee.com/mirrors/riscv-glibc
1

下载用于嵌入式的轻量级 C 库源代码仓库，即 riscv-newlib

git clone https://gitee.com/mirrors/riscv-newlib
1

下载二进制工具集合源代码仓库 riscv-binutils

git clone -b riscv-binutils-2.35 https://gitee.com/mirrors/riscv-binutils-gdb riscv-binutils
1

下载 GDB 软件调试器源代码仓库 riscv-gdb

git clone -b fsf-gdb-10.1-with-sim https://gitee.com/mirrors/riscv-binutils-gdb riscv-gdb
1

配置工具链

kdir build  #建立build目录
#配置操作，终端一定要切换到build目录下再执行如下指令
../configure --prefix=/opt/riscv/gcc --enable-multilib --target=riscv64-multlib-elf
1
2
3

编译工具链

sudo make -j8
1

这个指令在编译完成后会自动安装到“/opt/riscv/gcc”目录，由于要操作“/opt/riscv/gcc”目录需要超级管理员权限，所以我们要记得加上 sudo

切换到“/opt/riscv/gcc/bin”目录下，执行如下指令

riscv64-unknown-elf-gcc -v
1

看是否有riscv64-unknown-elf-gcc版本信息