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[Bug fortran/68717] [6/7 Regression] New (bogus?) warnings when compiling some gfortran.dg tests with -flto after r231239


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68717

--- Comment #3 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> As discussed in the other related PR, those are real issues - Fortran
> fronetnd should not declare one function with multiple and incompatible
> declarations.

The other related PR is pr68649.

The note: "code may be misoptimized unless -fno-strict-aliasing is used" looks
odd as the warnings are still there if one uses -fno-strict-aliasing as it was
the case before r231239.

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