Re: __builtin_mul_overflow_p support with llvm 5.0

[Paul Eggert]

Sorry, what's the context here?

In the past we've avoided having intprops.h depend on configure-time 
checks and to some extent I suppose I'd rather continue in that 
tradition, if only because that'll make it easier to fold into glibc one 
of these days. Can you reformulate the patch so that it just uses 
__has_attribute or __clang_major__ or whatever?