https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80152
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Blocks| |24639
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I think this is a commonly reported bug, conditional constant propagation
optimizes away the conditional uninitialized use (substituting 1 for foo)
and thus there is nothing to warn about left. The warning code before
any optimization happened does not warn about conditional uninitializations
because of too many false positives.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=24639
[Bug 24639] [meta-bug] bug to track all Wuninitialized issues
