https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117796

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|x86_64-w64-mingw32          |
      Known to fail|10.2.0, 10.3.0, 11.1.0,     |
                   |11.3.0, 11.4.0, 11.5.0,     |
                   |12.1.0, 12.2.0, 12.3.0,     |
                   |12.4.0, 13.1.0, 13.2.0,     |
                   |13.3.0, 14.1.0, 14.2.0,     |
                   |9.3.0                       |
               Host|x86_64-w64-mingw32          |
              Build|x86_64-w64-mingw32          |
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |INVALID

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>   char (*f)();

...
        f = some_unavailable_symbol;


With -flto and the other options, f becomes local and then f is only written to
so it is able to be removed.

If you marked f as being used with the attribute used, then it would not have
been removed.

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