[CMake] Using C++ compilers for C source files?

[Nadir SOUALEM]

Robert Blake wrote:
> I'm converting a large mixed C++/C cmake application to C++.  The 
> project has many ".c" files that I would like to compile with the C++ 
> compiler instead of the C compiler.  Does anyone know the proper way 
> to do this in CMake?
>
> Things I've tried:
> 1.) Changing CMAKE_C_COMPILER myself: Usually CMake doesn't let you 
> change CMAKE_C_COMPILER, but there are ways around that.  This way 
> feels like a hack.  The output while compiling still says "Compiling 
> C".  In addition, forcing CMAKE_*_COMPILER to change makes it very 
> difficult to run plane cmake on Unix machines where curses is not 
> installed.
>
> 2.) Tell CMake that ".c" files are in the CXX language:  I've tried
> PROJECT(Blah CXX)
> list(APPEND CMAKE_CXX_SOURCE_FILE_EXTENSIONS c)
>
> When I run CMake on my project with these changes, I get errors like:
>
> CMake Error: Cannot determine link language for target "foobar"
>
> ...for all my targets that depend only on .c files.
>
> Help!
> Rob
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Try

SET_SOURCE_FILES_PROPERTIES( file1.c file2.c PROPERTIES LANGUAGE CXX )


-- 
Nadir SOUALEM
Ingénieur INRIA - Équipe SAGE