https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96057
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |WONTFIX
Status|NEW |RESOLVED
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
That's because the -Wreturn-type diagnostic happens after we remove unused
functions which we only do at -O1+:
t.c: At global scope:
t.c:2:9: warning: 'int {anonymous}::foo()' defined but not used
[-Wunused-function]
2 | int foo() { 1 ? 0 : throw 0 ; }
| ^~~
which in turn is because the function is local (in an anonymous namespace).
Likely GCC 4.1 removed the function only later.
IMHO a WONTFIX, sorry.
