http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51773
--- Comment #5 from joseph at codesourcery dot com <joseph at codesourcery dot com> 2012-01-06 11:47:15 UTC --- On Fri, 6 Jan 2012, redi at gcc dot gnu.org wrote: > does glibc also define macros for alignof, true, false, bool etc. in C++ mode? Those C11 macros are defined in headers required to be provided by freestanding implementations, so provided by GCC, not glibc - but it was felt suitable to use assert.h for static_assert rather than creating a new stdstatic_assert.h header for that macro. We already discussed C++ semantics for those headers, see <http://gcc.gnu.org/ml/gcc-patches/2011-11/msg00847.html>.