Unable to specify the compiler with CMake

Question

I have a problem with this CMakeLists txt file   cmake minimum required VERSION 2 6   SET CMAKE C COMPILER C  MinGW bin gcc  SET CMAKE CXX COMPILER C  MinGW bin g     project cmake test   add executable a exe test cpp    Calling cmake with  cmake -G  MinGW Makefiles    it fails with the following output   c  Users pietro mele projects tests buildSystem test cmake test gt cmake -G  MinGW Makefiles    -- The C compiler identification is GNU 4 6 1 -- The CXX compiler identification is GNU 4 6 1 -- Check for working C compiler  C  MinGW bin gcc CMake Error  your C compiler   C  MinGW bin gcc  was not found    Please set CMAKE C COMPILER to a valid compiler path or name  CMake Error  Internal CMake error  TryCompile configure of cmake failed -- Check for working C compiler  C  MinGW bin gcc -- broken CMake Error at C  Program Files  x86  CMake 2 8 share cmake-2 8 Modules CMakeTestCCompiler cmake 52  MESSAGE     The C compiler  C  MinGW bin gcc  is not able to compile a simple test   program   CMake will not be able to correctly generate this project  Call Stack  most recent call first   CMakeLists txt 10  project   CMake Error  your C compiler   C  MinGW bin gcc  was not found    Please set CMAKE C COMPILER to a valid compiler path or name  CMake Error  your CXX compiler   C  MinGW bin g    was not found    Please set CMAKE CXX COMPILER to a valid compiler path or name  -- Configuring incomplete  errors occurred    However the gcc compiler is in C  MinGW bin  and it works   Any idea   Platform    Windows 7   MinGW GCC 4 6

User · Answer

I had similar problem as Pietro   I am on Window 10 and using  Git Bash   I tried to execute   cmake -G  MinGW Makefiles   but I got the same error as Pietro   Then  I tried   cmake -G  MSYS Makefiles   but realized that I need to set my environment correctly   Make sure set a path to C  MinGW msys 1 0 bin and check if you have gcc exe there  If gcc exe is not there then you have to run C  MinGW bin mingw-get exe and install gcc from MSYS   After that it works fine for me

User · Answer

Never try to set the compiler in the CMakeLists txt file   See the CMake FAQ about how to use a different compiler   https   gitlab kitware com cmake community wikis FAQ how-do-i-use-a-different-compiler   Note that you are attempting method  3 and the FAQ says   avoid        We recommend avoiding the  in the CMakeLists  technique because there are problems with it when a different compiler was used for a first configure  and then the CMakeLists file changes to try setting a different compiler    And because the intent of a CMakeLists file should be to work with multiple compilers  according to the preference of the developer running CMake   The best method is to set the environment variables CC and CXX before calling CMake for the very first time in a build tree   After CMake detects what compilers to use  it saves them in the CMakeCache txt file so that it can still generate proper build systems even if those variables disappear from the environment     If you ever need to change compilers  you need to start with a fresh build tree

User · Answer

I had the same issue  And in my case the fix was pretty simple  The trick is to simply add the   exe  to your compilers path  So  instead of    SET CMAKE C COMPILER C  MinGW bin gcc    It should be   SET CMAKE C COMPILER C  MinGW bin gcc exe    The same applies for g

User · Answer

Using with FILEPATH option might work   set CMAKE CXX COMPILER FILEPATH C  MinGW bin gcc exe

[gcc] Unable to specify the compiler with CMake

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