http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56019
Jobst.Ziebell at mailbox dot tu-dresden.de changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |Jobst.Ziebell at mailbox dot tu-dr | |esden.de --- Comment #4 from Jobst.Ziebell at mailbox dot tu-dresden.de --- The fix introduces another problem. Whenever '__need_size_t' is defined prior to the inclusion of <cstddef>, the type 'max_align_t' will not have been defined. This inevitably causes a compiler error: #define __need_size_t #include <cstddef> int main( void ) { return 0; } This happens on Mac OS X 10.9. In my case it got triggered by including <gmp.h>. Presumably this bug also occurs when #defining the other '__need_*' macros.