https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89501
--- Comment #13 from ncm at cantrip dot org --- What I am getting is that the compiler is leaving that permitted optimization -- eliminating the inode check -- on the table. It is doing that not so much because it would make Linus angry, but as an artifact of the particular optimization processes used in Gcc at the moment. Clang, or some later release of Gcc or Clang, or even this Gcc under different circumstances, might choose differently. But maybe there are some flavors of UB, among which returning uninitialized variables might be the poster child, that you don't ever want to use to drive some kinds of optimizations. Maybe Gcc's process has that baked in.
