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gcc 5.1 throws a rather amusing warning here: glxcmdsswap.c: In function ‘__glXSwapQueryExtensionsString’: glxcmdsswap.c:439:1: warning: function might be candidate for attribute ‘noreturn’ [-Wsuggest-attribute=noreturn] __glXSwapQueryExtensionsString(__GLXclientState * cl, GLbyte * pc) This is entirely accurate, albeit curiously phrased: swapping some bits hanging off the end of a null pointer will make Xdmx crash, so from the perspective of code generation the function will indeed not return. Reviewed-by: Keith Packard <keithp@keithp.com> Signed-off-by: Adam Jackson <ajax@redhat.com>