GCC Diagnostic Pragmas

[Jakub Zawadzki <darkjames-ws () darkjames pl>]

Hi,

In few dissectors we're manually disabling some kind of warnings, like
in packet-parlay.c

#ifdef _MSC_VER
/* disable warning: "unreference local variable" */
#pragma warning(disable:4101)
#endif

It's possible to do the same with GCC (4.6) using diagnostics pragmas[1].


Googling around found test:

#if __GNUC__ > 4 || (__GNUC__ == 4 && (__GNUC_MINOR__ >= 6 || __APPLE_CC__))
# pragma GCC diagnostic ignored "-Wunused"
#endif

which seems to be not working with my clang-3.3.

qemu does test during configure, trying to compile some test program with -Werror.

I think we could do the same, test program can looks like this:
#v+
        #pragma GCC diagnostic push
        #pragma GCC diagnostic ignored "-Wunused"
        #pragma GCC diagnostic pop

        int main(void) {
            return 0;
        }
#v-

OK?

[1] http://gcc.gnu.org/onlinedocs/gcc/Diagnostic-Pragmas.html
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