Please note, that in cases like Proposal: moving fftpack under fortran-lang - #29 by aradi, having the preprocessor in Fortran would only give any advantage over the current situation, if the preprocessor was always compiled with exactly the same compiler as the project. Otherwise, it won’t have access to the compiler-dependent Fortran internals, like the real_kinds array. Probably every compilation of a preprocessor dependent project would then have to start with the compilation of the preprocessor first. Doable, but extra effort when building projects.
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