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From: "rimvydas.jas at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/108349] New: LTO mismatch for __builtin_realloc between
 glibc and gfortran frontend
Date: Tue, 10 Jan 2023 09:28:01 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: fortran
X-Bugzilla-Version: 13.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108349

            Bug ID: 108349
           Summary: LTO mismatch for __builtin_realloc between glibc and
                    gfortran frontend
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rimvydas.jas at gmail dot com
  Target Milestone: ---

$ cat foo.f90
program foo
end program

module buffer
 integer,allocatable :: mpi_ids(:)
contains
 subroutine method(ids)
  integer,intent(in) :: ids(:)
  mpi_ids=3Dids
 end subroutine
end module

$ cat bar.c
#include "stdlib.h"
void bar(void *ptr){ptr =3D realloc(ptr,6);}

$ gfortran -flto foo.f90 bar.c             # no warning given
$ gfortran -flto bar.c foo.f90
<built-in>: warning: type of =E2=80=98__builtin_realloc=E2=80=99 does not m=
atch original
declaration [-Wlto-type-mismatch]
/usr/include/stdlib.h:564:14: note: type mismatch in parameter 1
  564 | extern void *realloc (void *__ptr, size_t __size)
      |              ^
/usr/include/stdlib.h:564:14: note: =E2=80=98realloc=E2=80=99 was previousl=
y declared here
/usr/include/stdlib.h:564:14: note: code may be misoptimized unless
=E2=80=98-fno-strict-aliasing=E2=80=99 is used

Why diagnostic is given depending on sources (or objects) order?

No diagnostic is provided if type arguments are swapped in
gcc/fortran/f95-lang.cc:996=