musl detection by preprocessor

[Jens Gustedt <jens.gustedt@inria.fr>]

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Hi everybody,
I was trying to compile my P99 test cases with musl and ran into
difficulties. Not because it has bugs, but the inverse, because it is
missing bugs that glibc has :)

In short I have some problem where they (the gnus) deviate from
standard interfaces, here this was triggered by their different
iterface for strerror_r. Now the musl compiler wrapper doesn't allow
to distinguish a linux system with glibc or with musl (or at least I
didn'find one).

Inspecting the wrapper, it looks quite easy to add something like

-D__MUSL__=000909UL

to the cpp_options section of musl-gcc.specs.sh

(I wouldn' know how to produce that version number automatically)

What do you think?

Best

Jens

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