https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78901
--- Comment #12 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Created attachment 40407 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40407&action=edit gcc7-pr78901-1.patch Untested fix. With this snprintf in -std=c++11 and above will be actually noexcept even if badly declared. But with -std=c++98 snprintf should not be recognized as a builtin. The gimple-ssa-sprintf.c changes will be still needed, because: extern "C" int __snprintf_chk (char *, __SIZE_TYPE__, int, __SIZE_TYPE__, const char *, ...); int foo (char *c) { try { return __snprintf_chk (c, 64, 0, 32, "%s", "abcdefghijklmnopq"); } catch (...) { } } still ICEs in -std=gnu++14 -O2 mode. That function and other *_chk ones aren't part of C89/C99/C11 and so if they aren't properly declared noexcept or nothrow(), we have to consider they might throw.
