[Bug libstdc++/50441] [C++0x] is missing GNU extension types

[marc.glisse at normalesup dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50441

--- Comment #14 from Marc Glisse <marc.glisse at normalesup dot org> 2011-09-18 
06:28:32 UTC ---
(In reply to comment #10)
> I'd like to have some help about the best way to figure out whether the target
> supports __int128_t and __uint128_t: is __CHAR_BIT__ * __SIZEOF_LONG__ >= 64
> good enough?

#ifdef __SIZEOF_INT128__
(that's used in the testsuite)