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From: "pvitt at posteo dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/97009] New: Inlining with non-standard
 selected_int_kind leads to errors
Date: Thu, 10 Sep 2020 11:32:02 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97009

            Bug ID: 97009
           Summary: Inlining with non-standard selected_int_kind leads to
                    errors
           Product: gcc
           Version: 10.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pvitt at posteo dot de
  Target Milestone: ---

Created attachment 49207
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D49207&action=3Dedit
Minimum working example to reproduce the problem.

We ran into a problem that I stripped down to a minimal working example (see
attachment).=20

When the MWE is compiled with `gfortran -O1 2269_mwe.f90`, it produces the
expected output

 Level            3  treeID                     0
 Level            2  treeID                     1
 Level            1  treeID                     9

When it is compiled with O2, it fails:

 Level            3  treeID       140732851705864
 Level            2  treeID       140732851705352
 Level            1  treeID            4545064992

When the line

    integer, parameter :: long_k =3D selected_int_kind(15)

is changed to

    integer, parameter :: long_k =3D selected_int_kind(9)

it works with O1 and O2.

We stumbled over this when some unit tests failed after we activated LTO. O=
ur
first guess was that LTO stumbles over the elemental function (which tem_pa=
thOf
was before I stripped it down). However, while creating the MWE, we ended up
reproducing the behavior also without LTO, but the called function in the s=
ame
file. And as it disappears with O1, it seems to be related to inlining in
general.=