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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/96057] [9/10/11/12 Regression] -Wreturn-type warning
 message disappears with -O1+ in anonymous namespace definition
Date: Fri, 21 Jan 2022 13:30:29 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96057

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.=