> ...not all C
> libraries define fabs() as a macro, since often there are more efficient
way
> to do the job. And I was talking about those other C libraries.

Specifically, windows/config.h contains the following code:

  #ifdef _MSC_VER            /* Microsoft Visual C++ */ /* [LSK] */
    #define COMPILER_VER            ".msvc"
    #define IFF_SWITCH_CAST       (long)
    ...

I thought it would be perfectly appropriate to augment that with:

    #define fabs fabs

that would force the use of intrinsic fabs() generating a single
instruction -- just for the particular development system with known
features.

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