Feature request - a macro defined for GCC

[x z]

> I very much doubt that any compiler other than gcc uses the gcc
> preprocessor.
>
> In any case, the documentation has in some sense misled you. __GNUC__
> is indeed defined by the compiler proper, not by the preprocessor.
> But that in turn does not matter, as if any non-gcc compiler *did* use
> the gcc preprocessor, it would do so via gcc -E. In gcc, the
> preprocessor is not a separate program.

Just one piece of info: A mpC compiler for parallel language uses GNU CPP: "The mpC compiler uses standard preprocessor cpp. You should specify the directory where cpp is placed when editing Makefile. We recommend to use GNU cpp."  (http://www.ispras.ru/~mpc/mpc-122-iguide.html).  I know, mpC is not exactly a C compiler.  But it seems that it is feasible (and was done) to use GNU CPP as a preprocesser in a compiler for C or a language based on C.

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