MQTT交叉编译(海思v300 arm-hisiv300-linux-)：openssl、paho.mqtt.c、paho.mqtt.cpp

编译环境

一、下载 openssl、paho.mqtt.c、paho.mqtt.cpp

这里使用的版本分别是

openssl-OpenSSL_1_1_1g.zip  
paho.mqtt.c-1.3.0.zip  
paho.mqtt.cpp-1.0.1.zip
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openssl GitHub下载地址
paho.mqtt.c GitHub下载地址
paho.mqtt.cpp GitHub下载地址

二、编译脚本

复制下面脚本保存为 mqtt_install.sh

#! /bin/sh
# mqtt_install.sh
# 指定编译结果的路径
RESULT_DIR=$(pwd)/result_dir
RESULT_SSL=${RESULT_DIR}/ssl_result
RESULT_MQTT_C=${RESULT_DIR}/mqtt.c
RESULT_MQTT_CPP=${RESULT_DIR}/mqtt.cpp

# 指定预案代码目录
SRC_SSL_DIR=openssl-OpenSSL_1_1_1g
SRC_MQTT_C_DIR=paho.mqtt.c-1.3.0
SRC_MQTT_CPP_DIR=paho.mqtt.cpp-1.0.1 

# 指定交叉编译工具
CROSSS_COMPILE_TOOL=arm-hisiv300-linux-

# 解压
unzip openssl-OpenSSL_1_1_1g.zip
unzip paho.mqtt.c-1.3.0.zip
unzip paho.mqtt.cpp-1.0.1.zip

# 1. 编译ssl
cd ${SRC_SSL_DIR}

# 1.1 配置输出目录和交叉编译器, (linux-generic32表示是32位操作系统,个别文章加了这个选项就不用去掉 -m64，我这里行不通)
./config no-asm shared no-async --prefix=${RESULT_SSL}  --cross-compile-prefix=${CROSSS_COMPILE_TOOL}

# 1.2 删除 -m64
sed -i 's/-m64//' Makefile

# 1.3 添加 CFLAGS+=-mcpu=cortex-a7 -mfloat-abi=softfp -mfpu=neon-vfpv4 -mno-unaligned-access -fno-aggressive-loop-optimizations
sed -i '/CFLAGS=-DDSO_DLFCN/a\CFLAGS+=-mcpu=cortex-a7 -mfloat-abi=softfp -mfpu=neon-vfpv4 -mno-unaligned-access -fno-aggressive-loop-optimizations' Makefile

# 1.4 make && make install
make && make install
cd ..

# 2. 编译 paho.mqtt.c-1.2.1
cd ${SRC_MQTT_C_DIR}

# 2.1 设置 prefix 目录
sed -i '/ifndef prefix/i\prefix='${RESULT_MQTT_C}'\' Makefile
sed -i '/CC ?= gcc/a\CC='${CROSSS_COMPILE_TOOL}'gcc\' Makefile

# 2.2 置顶 ssl 库路径
sed -i '/$(CFLAGS)/i\
CFLAGS := -mcpu=cortex-a7 -mfloat-abi=softfp -mfpu=neon-vfpv4 -mno-unaligned-access -fno-aggressive-loop-optimizations -I '${RESULT_SSL}'/include \
LDFLAGS := -L '${RESULT_SSL}'/lib\
' Makefile

# 2.3 
make 

# 2.4 拷贝结果
rm ${RESULT_MQTT_C} -rf
mkdir -p ${RESULT_MQTT_C}/include
mkdir -p ${RESULT_MQTT_C}/lib
cp build/output/libpaho-mqtt3a.* ${RESULT_MQTT_C}/lib -far
cp src/MQTT*.h ${RESULT_MQTT_C}/include -far
cd ..

# 3.编译 paho.mqtt.cpp-1.0.1
cd ${SRC_MQTT_CPP_DIR}

# 3.1 修改 CMakeList.txt ,使支持 C++11
sed -i '/C++11 build flags/a\add_definitions(-D_GLIBCXX_USE_C99=1)\' CMakeLists.txt

# 3.2 
# 这里的 DPAHO_MQTT_C_LIBRARIES 指定要使用哪个库，库的类型在 paho-mqtt.c 的 README 里有说到
mkdir build_arm 
cd build_arm 
cmake ..  -DCMAKE_CXX_COMPILER=${CROSSS_COMPILE_TOOL}g++ \
-DCMAKE_INSTALL_PREFIX=${RESULT_MQTT_CPP} \
-DPAHO_MQTT_C_LIBRARIES=${RESULT_MQTT_C}/lib/libpaho-mqtt3a.so \
-DPAHO_MQTT_C_INCLUDE_DIRS=${RESULT_MQTT_C}/include \
-DOPENSSL_SSL_LIBRARY=${RESULT_SSL}/lib/libssl.so  \
-DOPENSSL_INCLUDE_DIR=${RESULT_SSL}/include  \
-DOPENSSL_CRYPTO_LIBRARY=${RESULT_SSL}/lib/libcrypto.so \
-DCMAKE_CXX_FLAGS="-std=gnu++11 -mcpu=cortex-a7 -mfloat-abi=softfp -mfpu=neon-vfpv4 -ffunction-sections -mno-unaligned-access -fno-aggressive-loop-optimizations"

# 3.3 编译
make && make install

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三、执行编译脚本

ubuntu:/home/samba/MQTT$ ls
mqtt_install.sh  openssl-OpenSSL_1_1_1g.zip  paho.mqtt.c-1.3.0.zip  paho.mqtt.cpp-1.0.1.zip
ubuntu:/home/samba/MQTT$ ./mqtt_install.sh 
...
...
...
ubuntu:/home/samba/MQTT$ ls
mqtt_install.sh         openssl-OpenSSL_1_1_1g.zip  paho.mqtt.c-1.3.0.zip  paho.mqtt.cpp-1.0.1.zip
openssl-OpenSSL_1_1_1g  paho.mqtt.c-1.3.0           paho.mqtt.cpp-1.0.1    result_dir
ubuntu:/home/samba/MQTT$ ls result_dir/
mqtt.c  mqtt.cpp  ssl_result
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执行脚本后会在当前目录生成一个目录 result_dir，里面有 mqtt.c 和 mqtt.cpp

四、注意

4.1 如果编译mqtt.cpp时报错，且与 cmake 有关的，可以更新一下 cmake

https://cmake.org/files/v3.20/

tar -xzvf cmake-3.13.0-Linux-x86_64.tar.gz

# 解压出来的包，将其放在 /opt 目录下，其他目录也可以，主要别以后不小心删了
sudo mv cmake-3.13.0-Linux-x86_64 /opt/cmake-3.13.0

# 建立软链接
sudo ln -sf /opt/cmake-3.13.0/bin/*  /usr/bin/

# 查看 cmake 版本
cmake --version
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4.2 如果编译mqtt.cpp时报如下错误，则可能是没配置好C++11相关的配置

/home/samba/MQTT/paho.mqtt.cpp-1.0.1/build_arm$ make
Consolidate compiler generated dependencies of target paho-cpp-objs
[  7%] Building CXX object src/CMakeFiles/paho-cpp-objs.dir/async_client.cpp.o
In file included from /home/samba/MQTT/paho.mqtt.cpp-1.0.1/src/mqtt/token.h:29:0,
                 from /home/samba/MQTT/paho.mqtt.cpp-1.0.1/src/mqtt/async_client.h:29,
                 from /home/samba/MQTT/paho.mqtt.cpp-1.0.1/src/async_client.cpp:19:
/home/samba/MQTT/paho.mqtt.cpp-1.0.1/src/mqtt/exception.h: In constructor ‘mqtt::exception::exception(int)’:
/home/samba/MQTT/paho.mqtt.cpp-1.0.1/src/mqtt/exception.h:56:39: error: ‘to_string’ is not a member of ‘std’
   : std::runtime_error("MQTT error ["+std::to_string(code)+"]"), code_(code) {}
                                       ^
/home/samba/MQTT/paho.mqtt.cpp-1.0.1/src/mqtt/exception.h: In constructor ‘mqtt::exception::exception(int, const string&)’:
/home/samba/MQTT/paho.mqtt.cpp-1.0.1/src/mqtt/exception.h:63:38: error: ‘to_string’ is not a member of ‘std’
    std::runtime_error("MQTT error ["+std::to_string(code)+"]: "+msg),
                                      ^
make[2]: *** [src/CMakeFiles/paho-cpp-objs.dir/async_client.cpp.o] Error 1
make[1]: *** [src/CMakeFiles/paho-cpp-objs.dir/all] Error 2
make: *** [all] Error 2
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解决办法：

在paho.mqtt.cpp-1.0.1目录下的CMakeLists.txt下一行加上
add_definitions(-D_GLIBCXX_USE_C99=1)

交叉编译链 Gcc 4.8.3 加上-D_GLIBCXX_USE_C99=1才能使用to_string，然后再重新执行cmake，make，