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Sun C 5.12 defines __SUNPRO_C to 0x5120 but diagnoses ‘__attribute__ ((__unused__))’. Change the ifdefs to use the same method as Gnulib in this area. * data/skeletons/c.m4 (YY_ATTRIBUTE): Remove, since not all attributes were added in the same compiler version. (YY_ATTRIBUTE_PURE, YY_ATTRIBUTE_UNUSED): Use specific GCC version for each attribute. Pay no attention to __SUNPRO_C. * tests/headers.at (Several parsers): Tighten tests accordingly.