（1）问题1：cl is not a full path and was not found in the PATH
cmake .
-- Building for: NMake Makefiles
-- The C compiler identification is unknown
-- The CXX compiler identification is unknown
CMake Error at CMakeLists.txt:5 (project):
The CMAKE_C_COMPILER:
cl
is not a full path and was not found in the PATH.
To use the NMake generator with Visual C++, cmake must be run from a shell
that can use the compiler cl from the command line. This environment is
unable to invoke the cl compiler. To fix this problem, run cmake from the
Visual Studio Command Prompt (vcvarsall.bat).
Tell CMake where to find the compiler by setting either the environment
variable "CC" or the CMake cache entry CMAKE_C_COMPILER to the full path to
the compiler, or to the compiler name if it is in the PATH.
CMake Error at CMakeLists.txt:5 (project):
The CMAKE_CXX_COMPILER:
cl
is not a full path and was not found in the PATH.
To use the NMake generator with Visual C++, cmake must be run from a shell
that can use the compiler cl from the command line. This environment is
unable to invoke the cl compiler. To fix this problem, run cmake from the
Visual Studio Command Prompt (vcvarsall.bat).
Tell CMake where to find the compiler by setting either the environment
variable "CXX" or the CMake cache entry CMAKE_CXX_COMPILER to the full path
to the compiler, or to the compiler name if it is in the PATH.
解决方法：注意gcc.exe一定要带上exe文件名!
export CC="/d/msys32/mingw32/bin/gcc.exe"
export CXX="/d/msys32/mingw32/bin/g++.exe"
cmake /path/to/your/project
（2）问题2
$ cmake .
-- Building for: NMake Makefiles
-- The C compiler identification is GNU 5.3.0
-- The CXX compiler identification is GNU 5.3.0
-- Check for working C compiler: D:/msys32/mingw32/bin/gcc.exe
CMake Error: Generator: execution of make failed. Make command was: "nmake" "/NOLOGO" "cmTC_409d1\fast"
-- Check for working C compiler: D:/msys32/mingw32/bin/gcc.exe -- broken
CMake Error at D:/msys32/mingw32/share/cmake-3.4/Modules/CMakeTestCCompiler.cmake:61 (message):
The C compiler "D:/msys32/mingw32/bin/gcc.exe" is not able to compile a
simple test program.
It fails with the following output:
Change Dir: D:/msys32/home/Demo1/CMakeFiles/CMakeTmp
Run Build Command:"nmake" "/NOLOGO" "cmTC_409d1\fast"
系统找不到指定的文件。
Generator: execution of make failed. Make command was: "nmake" "/NOLOGO"
"cmTC_409d1\fast"
解决方法：
cmake . -G"MSYS Makefiles"
(3) 运行结果
$ cmake . -G"MSYS Makefiles"
-- The C compiler identification is GNU 5.3.0
-- The CXX compiler identification is GNU 5.3.0
-- Check for working C compiler: D:/msys32/mingw32/bin/gcc.exe
-- Check for working C compiler: D:/msys32/mingw32/bin/gcc.exe -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: D:/msys32/mingw32/bin/g++.exe
-- Check for working CXX compiler: D:/msys32/mingw32/bin/g++.exe -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Configuring done
-- Generating done
-- Build files have been written to: D:/msys32/home/Demo2
$ make
Scanning dependencies of target Demo
[ 33%] Building CXX object CMakeFiles/Demo.dir/main.cc.obj
[ 66%] Building CXX object CMakeFiles/Demo.dir/MathFunctions.cc.obj
[100%] Linking CXX executable Demo.exe
[100%] Built target Demo
$ ./demo 3 3
3 ^ 3 is 27