1. 官方网站：https://www.msys2.org/
2.清华大学镜像：https://mirror.tuna.tsinghua.edu.cn/help/msys2/
3. 常用操作：https://segmentfault.com/n/1330000004236998
4.msys2包含mingw32和mingw64两个目录，pacman安装的时候查询的包会出来一堆，要看清楚是mingw32还是mingw64，一不小心就会安装错了
一般是用pacman -Sl cmake | grep mingw64这种命令搜索一下
1.cmake
windows下不能像linux下使用命令:
cmake .
这个时候会把项目生成vc的sln文件，实际上pacman安装的cmake和从cmake官方的工功能是一样的，默认都是生成vc的sln文件
如果想要linux下生成Makefile文件的功能，执行cmake时要添加下面的选项
cmake -G "MinGW Makefiles" . # 这个有时候有问题 cmake -G "MSYS Makefiles" . # 这个更好一些
2.make
make安装完之后，文件名是mingw32-make.exe，要手工改成make.exe
3.gdb也需要单独安装
pacman -S mingw-w64-x86_64-gdb
4.git bash中使用gcc、make、cmake等命令
mingw64默认是不包含GUN的Toolchain的，msys2的主要作用是提供了pacman工具可以安装这些Toolchain
我们一般习惯使用git bash，而且他跟文件夹上下文菜单和其他工具的命令行绑定的比较好，所以我更愿意在git bash中使用gcc、make、cmake等命令
这个时候PATH中添加C:msys64mingw64in即可
5.日常开发工具
日常开发调试，要执行cmake、make、./app.exe很烦，可以自己写一个命令执行这三个命令即可
vs2017和vs2019是支持cmake的，但是我本地环境都报这个错误，换成mingw64的ToolChain错误是一样的
1> CMake generation started for configuration: 'x64-Debug'. 1> Command line: "cmd.exe" /c ""C:PROGRAM FILES (X86)MICROSOFT VISUAL STUDIO2019COMMUNITYCOMMON7IDECOMMONEXTENSIONSMICROSOFTCMAKECMakeincmake.exe" -G "Ninja" -DCMAKE_INSTALL_PREFIX:PATH="D:gitcvcmkcmk04outinstallx64-Debug" -DCMAKE_C_COMPILER:FILEPATH="C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.25.28610/bin/HostX64/x64/cl.exe" -DCMAKE_CXX_COMPILER:FILEPATH="C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.25.28610/bin/HostX64/x64/cl.exe" -DCMAKE_BUILD_TYPE="Debug" -DCMAKE_MAKE_PROGRAM="C:PROGRAM FILES (X86)MICROSOFT VISUAL STUDIO2019COMMUNITYCOMMON7IDECOMMONEXTENSIONSMICROSOFTCMAKENinja inja.exe" "D:gitcvcmkcmk04" 2>&1" 1> Working directory: D:gitcvcmkcmk04outuildx64-Debug 1> [CMake] -- The C compiler identification is MSVC 19.25.28612.0 1> [CMake] -- The CXX compiler identification is MSVC 19.25.28612.0 1> [CMake] -- Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.25.28610/bin/HostX64/x64/cl.exe 1> [CMake] -- Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.25.28610/bin/HostX64/x64/cl.exe -- broken 1> [CMake] CMake Error at C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/Common7/IDE/CommonExtensions/Microsoft/CMake/CMake/share/cmake-3.16/Modules/CMakeTestCCompiler.cmake:60 (message): 1> [CMake] The C compiler 1> [CMake] 1> [CMake] "C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.25.28610/bin/HostX64/x64/cl.exe" 1> [CMake] 1> [CMake] is not able to compile a simple test program. 1> [CMake] 1> [CMake] It fails with the following output: 1> [CMake] 1> [CMake] Change Dir: D:/git/cv/cmk/cmk04/out/build/x64-Debug/CMakeFiles/CMakeTmp 1> [CMake] 1> [CMake] Run Build Command(s):C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/Common7/IDE/CommonExtensions/Microsoft/CMake/Ninja/ninja.exe cmTC_8fabf && [1/2] Building C object CMakeFilescmTC_8fabf.dir estCCompiler.c.obj 1> [CMake] [2/2] Linking C executable cmTC_8fabf.exe 1> [CMake] FAILED: cmTC_8fabf.exe 1> [CMake] cmd.exe /C "cd . && "C:Program Files (x86)Microsoft Visual Studio2019CommunityCommon7IDECommonExtensionsMicrosoftCMakeCMakeincmake.exe" -E vs_link_exe --intdir=CMakeFilescmTC_8fabf.dir --rc=C:PROGRA~2WI3CF2~110in100183~1.0x64 c.exe --mt=C:PROGRA~2WI3CF2~110in100183~1.0x64mt.exe --manifests -- C:PROGRA~2MICROS~32019COMMUN~1VCToolsMSVC1425~1.286inHostx64x64link.exe /nologo CMakeFilescmTC_8fabf.dir estCCompiler.c.obj /out:cmTC_8fabf.exe /implib:cmTC_8fabf.lib /pdb:cmTC_8fabf.pdb /version:0.0 /machine:x64 /debug /INCREMENTAL /subsystem:console kernel32.lib user32.lib gdi32.lib winspool.lib shell32.lib ole32.lib oleaut32.lib uuid.lib comdlg32.lib advapi32.lib && cd ." 1> [CMake] Active code page: 65001 1> [CMake] The system cannot find the path specified. 1> [CMake] ninja: build stopped: subcommand failed. 1> [CMake] 1> [CMake] 1> [CMake] 1> [CMake] 1> [CMake] 1> [CMake] CMake will not be able to correctly generate this project. 1> [CMake] Call Stack (most recent call first): 1> [CMake] CMakeLists.txt:6 (project) 1> [CMake] -- Configuring incomplete, errors occurred! 1> [CMake] See also "D:/git/cv/cmk/cmk04/out/build/x64-Debug/CMakeFiles/CMakeOutput.log". 1> [CMake] See also "D:/git/cv/cmk/cmk04/out/build/x64-Debug/CMakeFiles/CMakeError.log". 1> [CMake] 1> cmd.exe /c ""C:PROGRAM FILES (X86)MICROSOFT VISUAL STUDIO2019COMMUNITYCOMMON7IDECOMMONEXTENSIONSMICROSOFTCMAKECMakeincmake.exe" -G "Ninja" -DCMAKE_INSTALL_PREFIX:PATH="D:gitcvcmkcmk04outinstallx64-Debug" -DCMAKE_C_COMPILER:FILEPATH="C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.25.28610/bin/HostX64/x64/cl.exe" -DCMAKE_CXX_COMPILER:FILEPATH="C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.25.28610/bin/HostX64/x64/cl.exe" -DCMAKE_BUILD_TYPE="Debug" -DCMAKE_MAKE_PROGRAM="C:PROGRAM FILES (X86)MICROSOFT VISUAL STUDIO2019COMMUNITYCOMMON7IDECOMMONEXTENSIONSMICROSOFTCMAKENinja inja.exe" "D:gitcvcmkcmk04" 2>&1" returned with exit code: 1