[Bug c/90541] Warning not emitted on use of uninitialized variable

[wingo at igalia dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90541

--- Comment #2 from Andy Wingo <wingo at igalia dot com> ---
Thanks for the information.  For what it's worth, clang issues a warning for
this code, and includes this warning under -Wall.