https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88576
--- Comment #9 from Zack Weinberg <zackw at panix dot com> --- ... whoops, hit send a little too early. AFAICT, the relevant code is call_may_clobber_ref_p_1 in tree-ssa-alias.c; I would say that the uses of flag_errno_math under the cases BUILT_IN_MALLOC, ALIGNED_ALLOC, CALLOC, STRDUP, STRNDUP, POSIX_MEMALIGN, REALLOC in that function are all wrong, and GCC should unconditionally assume errno may be clobbered by those builtins. If this behavior is felt to be valuable, it should get its own -f switch. (The uses of flag_errno_math under BUILT_IN_GAMMA*, LGAMMA*, and REMQUO* are appropriate, though, as those _are_ math functions.)
