cmake:VS2015和GCC编译cJSON

cJSON是基于ANSI C的跨平台JSON解析开源库,在嵌入式应用中使用比较广泛, cJSON支持CMAKE编译，本文以脚本形式提供了使用CMAKE基于VS2015/Windows以及GCC/MinGW的编译过程。

环境要求

cmake 这是必须的编译工具

Visual Studio 2015 OR MinGW for windows

gcc for linux

Visual Studio 2015 编译脚本

msvc_build.bat
要求cJSON源码文件夹与msvc_build.bat脚本在同一级文件夹
执行以下脚本会编译出cJSON动态库、静态库,以及Debug和Release版本并安装到
release\cJSON_windows_vc_x86_64 文件夹下

:: 基于 Windows Visual Studio 2015 的 cJSON 编译脚本
:: 可选参数:
::   /S              - 编译单元测试
::   /U              - 编译CJSON_UTILS
@ECHO OFF
SETLOCAL
:: 检查是否安装了VS2015
ECHO make paho mqtt VS2015 project
IF NOT DEFINED VS140COMNTOOLS (
	ECHO vs2015 NOT FOUND.
	EXIT /B -1
)
ECHO vs2015 found.
:: 检查是否安装了CMAKE
WHERE cmake
IF ERRORLEVEL 1 (
	ECHO cmake NOT FOUND.
	EXIT /B -1
)
ECHO cmake found
SET sh_folder=%~dp0
:: 删除最后的 '\'
SET sh_folder=%sh_folder:~0,-1%

SET BUILD_TEST=FALSE
SET BUILD_UTILS=FALSE
:: 解析命令行参数
:loop
IF x%1 == x GOTO :pare_end
IF /I "%1" == "/S"      SET BUILD_TEST=TRUE
IF /I "%1" == "/U"      SET BUILD_UTILS=TRUE

SHIFT
GOTO :loop
:pare_end

:: cJSON源码文件夹名(与当前脚本在同一级文件夹)
SET src_folder=cJSON
SET release_prefix=cJSON

SET cmake_prefix_path=

SET project_folder=%sh_folder%\build\%release_prefix%.vs2015
:: 指定安装路径为当前文件夹下release\cJSON_windows_vc_x86-64
IF "%OUTDIR%x" == "x" SET OUTDIR=%sh_folder%\release\%release_prefix%_windows_vc_x86-64

ECHO project_folder=%project_folder%
ECHO OUTDIR=%OUTDIR%

:: 生成项目工程文件
IF EXIST %project_folder% RMDIR %project_folder% /s/q 
MKDIR %project_folder% 
PUSHD %project_folder% || EXIT /B

IF NOT DEFINED VisualStudioVersion (
	ECHO make MSVC environment ...
	CALL "%VS140COMNTOOLS%..\..\vc/vcvarsall" x86_amd64
)

ECHO creating x86_64 Project for Visual Studio 2015 ...
CMAKE %sh_folder%\%src_folder% -G "Visual Studio 14 2015 Win64" -DCMAKE_INSTALL_PREFIX=%OUTDIR% ^
    %cmake_prefix_path% ^
	-DBUILD_SHARED_AND_STATIC_LIBS=ON ^
	-DENABLE_CJSON_UTILS=%BUILD_UTILS% ^
    -DENABLE_CJSON_TEST=%BUILD_TEST% ^
    -DCMAKE_DEBUG_POSTFIX=_d ^
	-DENABLE_TARGET_EXPORT=ON  || EXIT /B

:: 编译Release版
cmake --build . --config Release --target install -- /maxcpucount || EXIT /B
:: 编译Debug版
cmake --build . --config Debug   --target install -- /maxcpucount || EXIT /B
POPD
ENDLOCAL

GNU C编译脚本

gnu_build.sh
要求cJSON源码文件夹与gnu_build.sh脚本在同一级文件夹
执行以下脚本同会编译出cJSOn动态库、静态库,并安装到release/cJSON-$machine 文件夹下
如果未指定环境变量BUILD_TYPE为DEBUG,默认编译Release版本

#!/bin/bash
# cJSON 编译脚本(支持交叉编译)
# Optional Command Arguments:
#    ONLYBUILD   不执行 cmake 创建工程只编译版本
#	 BUILD_UTILS build cjson utils
#	 BUILD_TEST  build test
# Optional Environment Variables: 
#    TOOLCHAIN_FILE 指定交叉编译的工具链文件
# 	 MACHINE 目标平台, such as x86_64-linux-gnu,默认使用当前系统平台
#    PREFIX 安装路径
#    PROJECT_FOLDER cmake 生成的工程文件(Makefile)文件夹
#    BUILD_TYPE 编译版本类型(DEBUG|RELEASE),默认 RELEASE

#字符串转大写
#参数：1字符串
function string_toupper()
{
    echo $1 | tr '[a-z]' '[A-Z]'
}
sh_folder=$(cd "$(dirname $0)"; pwd -P)
folder_name=$(basename $sh_folder) 
# 定义编译的版本类型(DEBUG|RELEASE)
build_type=RELEASE
[[ "$(string_toupper $BUILD_TYPE)" =~ DEBUG|RELEASE ]] && build_type=$(string_toupper ${BUILD_TYPE})

echo build_type=$build_type

# 执行 cmake 创建工程
create_prj=ON
build_utils=OFF
build_test=OFF
while [[ $# -gt 0 ]]
do
# 转大写
key=$(string_toupper ${1})
case $key in
ONLYBUILD)
	create_prj=OFF;shift;;
BUILD_UTILS)
	build_utils=ON;;
BUILD_TEST)
	build_test=ON;;
*) shift;;
esac
done

machine=$(g++ -dumpmachine)

[ -n "$MACHINE" ] && machine=$MACHINE

# 工具链文件
toolchain=
[ -n "$TOOLCHAIN_FILE" ] && toolchain="-DCMAKE_TOOLCHAIN_FILE=$TOOLCHAIN_FILE"

# 安装路径
[ -n "$PREFIX" ] && install_prefix="$PREFIX"
[ -z "$PREFIX" ] && install_prefix=$sh_folder/release/cJSON-$machine

# 编译路径
[ -n "$PROJECT_FOLDER" ] && prj_folder="$PROJECT_FOLDER"
[ -z "$PROJECT_FOLDER" ] && prj_folder=$sh_folder/build/cJSON-$machine

echo =========================================================================
echo       Configuration: cJSON $machine:$build_type
echo     Build Directory: $prj_folder
echo   Install Directory: $install_prefix
echo =========================================================================

if [[ "${create_prj}" = ON ]]
then
	[ -d $prj_folder ] && rm -fr $prj_folder
	mkdir -p $prj_folder || exit 

	pushd $prj_folder || exit
	echo "creating Project for $machine ..."
	cmake "$sh_folder/cJSON" -G "Eclipse CDT4 - Unix Makefiles" -DCMAKE_BUILD_TYPE=$build_type \
		-DCMAKE_INSTALL_PREFIX=$install_prefix \
		-DCMAKE_POSITION_INDEPENDENT_CODE=ON \
		-DBUILD_SHARED_AND_STATIC_LIBS=ON \
		-DENABLE_CJSON_UTILS=$build_utils \
    	-DENABLE_CJSON_TEST=$build_test \
		-DCMAKE_DEBUG_POSTFIX=_d \
		-DENABLE_TARGET_EXPORT=ON \
		-DENABLE_CUSTOM_COMPILER_FLAGS=OFF \
		$toolchain || exit

else
	pushd $prj_folder || exit
fi

cmake --build . --target install/strip -- -j8 || exit 

popd

cjson.build

以上完整脚本参见码云仓库 https://gitee.com/l0km/cjson.build.git

如果你只想编译cJSON,可以如下直接克隆 https://gitee.com/l0km/cjson.build.git 这个项目到本地(一定要加--recursive参数)

git clone --recursive https://gitee.com/l0km/cjson.build.git

然后执行其中的msvc_build.bat或gnu_build.sh就可以编译出你想要的cJSON库