https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89550
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Created attachment 45916 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45916&action=edit gcc9-pr89550.patch While investigating why r264868 didn't warn even when the IL is pretty much the same, I've found that it is because c_strlen was called with a different location (from system header) during ccp and without -Wsystem-headers it set TREE_NO_WARNING, yet hasn't emitted any warnings, and then later on it would warn, but doesn't, because TREE_NO_WARNING was set. This patch fixes all such spots I found, I guess it might cause more warnings generally, will see what it does in the testsuite.
