[CMake] Using m4 as a additional preprocessor for C/C++

[Prasad H. L.]

Hi,

I wanted to do some looping in macros which are not possible in GNU
CPP. So, I wrote
macros in m4. I wish to pre-process all my C/C++ code with m4 before
handing it over to
gcc. I did not find any direct way out for doing this in cmake. Any
ideas how to do it with
cmake?

Regards,
Prasad