c++ - CMAKE_C_COMPILER 未设置，EnableLanguage 之后

Question

除了 gcc 和 g++ 编译器之外，我还在 Windows 上安装了 CMake 我将变量添加到路径中，但仍然出现以下错误，请您帮忙。

-- Building for: NMake Makefiles
CMake Error at CMakeLists.txt:6 (project):
  Running

   'nmake' '-?'

  failed with:

   The system cannot find the file specified


CMake Error: CMAKE_C_COMPILER not set, after EnableLanguage
CMake Error: CMAKE_CXX_COMPILER not set, after EnableLanguage
-- Configuring incomplete, errors occurred!
See also "C:/Users/DEANHOS/Desktop/peer/cmake tutorial/codeAndTech/sample/CMakeFiles/CMakeOutput.log".

Answer 1

这些变量需要在命令行上传递为：

$ cmake -DCMAKE_CXX_COMPILER=/pathto/g++ -DCMAKE_C_COMPILER=/pathto/gcc /pathto/source

project()或在 CMakeLists.txt中的行前设置：

set( CMAKE_CXX_COMPILER "/pathto/g++" )
set( CMAKE_C_COMPILER "/pathto/gcc" )

project(mytest)
...

或者使用-C <toolchain>命令作为

# mygcc.cmake 
# toolchain file
set( CMAKE_CXX_COMPILER "/pathto/g++" )
set( CMAKE_C_COMPILER "/pathto/gcc" )

$ cmake -C /pathto/mygcc.cmake /pathto/source