probing for compiler attributes?

[Joshua Hoblitt]

Is there a pre-canned AC macro or other reliable means of testing for
compiler attributes?

I have an awful lot of code that looks something like this:

        void *myfunc(char *myvar
        #ifdef __GNUC__
        ) __attribute__((malloc));
        # else // ifdef __GNUC__
        );
        #endif // ifdef __GNUC__

and it has to the potential to get a lot worse if I have to start testing
for what version of GNUC we have to use a new attribute.  While I
realize this could all be done with CPP macros it occurred to me it would
be nice to have this information available from config.h.

-J

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