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I installed CMake on windows in addition to gcc and g++ compiler I added the variables to the path but still getting the following error could you please help.

enter image description here

-- 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".
Anas Hosami
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  • You are trying to configure the project for NMake generator, but executable `nmake` is not accessible on your machine. This is what the **first error message** about. – Tsyvarev Dec 29 '21 at 19:52
  • Thanks @Tsyvarev you are right. I defined the generator like this `cmake -G "MinGW Makefiles" .` and the first error disappeared Appreciate it – Anas Hosami Dec 30 '21 at 11:56
  • In my case it was because of trying to build (`cmake --build ..`) before configuring (`cmake ..`). Any subsequeny configure commands ended up with the above error. Deleting everything in the build directory and rerunning `cmake ..` fixed it! – Jonathan Levin Mar 03 '22 at 14:28

1 Answers1

13

These variables need to be passed on the command line as:

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

or set up before the project() line in CMakeLists.txt:

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

project(mytest)
...

or alternatively brought in with the -C <toolchain> command as

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

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