[Cmake] Forcing the use of C++ compiler for .c files

[Dekeyser, Kris]

Hi,

We currently have some legacy C++ code. Most of these files use extension
.c, but they really contain C++ code. CMake however automatically selects
the CMAKE_C_COMPILER to compile the files, which causes an error. Forcing
CMake to use the C++ compiler doesn't work either, because CMake detects
that it is not a C Compiler, but C++ compiler.

The only solution I found is to hack the
${CMAKE_ROOT}/Modules/CMakeTestCCompiler.cmake and disable the C++ check.

However, we do need to compile another project with the C Compiler and not
with the C++ compiler, so we end up to hack/unhack the test file all the
time.

Is there another - better - way to force the usuage of the C++ compiler in
CMake for certain files? If not, could it be added?

Best regards,
Kris
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