https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61129
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Paul Eggert from comment #2) > It'd be nice if this were higher priority. I've been wanting this for years. > We jump through a lot of confusing hoops in GNU applications to test for > integer overflow, both signed and unsigned. See, for example, > INT_MULTIPLY_OVERFLOW in: > > http://git.savannah.gnu.org/gitweb/?p=gnulib.git;a=blob;f=lib/intprops.h; > h=d0bb7a6f57734e15e535cfc6b287a555dc6ccbb3;hb=HEAD > > Also, the need for a fast test for unsigned multiplication overflow recently > came up in glibc internals discussions when writing a memory allocator. See: > > https://sourceware.org/ml/libc-alpha/2014-05/msg00480.html You would still need them to compile with older GCCs anyways. Glibc still needs to compiler with a few year old GCC.
