https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96312

Thomas Koenig <tkoenig at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rguenther at suse dot de

--- Comment #4 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Bisection points towards

2092f134b7180cd2542cff93bd8a876b3e59a77b is the first bad commit
commit 2092f134b7180cd2542cff93bd8a876b3e59a77b
Author: Richard Biener <rguent...@suse.de>
Date:   Wed May 15 12:57:32 2019 +0000

    tree-into-ssa.c (pass_build_ssa::execute): Run update_address_taken before
going into SSA.

    2019-05-15  Richard Biener  <rguent...@suse.de>

        * tree-into-ssa.c (pass_build_ssa::execute): Run
        update_address_taken before going into SSA.

    From-SVN: r271209

I tested this (in the bisect script) for the occurrence of the
warning with

$HOME/trunk-bin/gcc/f951 -quiet moda.f90
$HOME/trunk-bin/gcc/f951 -quiet -Wall -O3  modc.f90 -Werror

so it is likely that this patch just started issuing a warning
for a pre-existing bug in the front end.

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