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From: "ro at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug testsuite/100467] New: [12 regression]
 g++.dg/debug/dwarf2/thunk1.C
Date: Fri, 07 May 2021 08:47:11 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100467

            Bug ID: 100467
           Summary: [12 regression] g++.dg/debug/dwarf2/thunk1.C
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: testsuite
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ro at gcc dot gnu.org
                CC: edlinger at gcc dot gnu.org
  Target Milestone: ---
            Target: i?86-*-*, x86_64-*-*

Between 20210505 (b927ffdd6cecd0eeda6ef77df2623519870b1e75) and 20210506
(07dd185755a791ab19e6a63274cf2cb69f087a6c),
the g++.dg/debug/dwarf2/thunk1.C test regressed:

+FAIL: g++.dg/debug/dwarf2/thunk1.C  -std=3Dgnu++14  scan-assembler-times L=
FB3 5
+FAIL: g++.dg/debug/dwarf2/thunk1.C  -std=3Dgnu++17  scan-assembler-times L=
FB3 5
+FAIL: g++.dg/debug/dwarf2/thunk1.C  -std=3Dgnu++2a  scan-assembler-times L=
FB3 5
+FAIL: g++.dg/debug/dwarf2/thunk1.C  -std=3Dgnu++98  scan-assembler-times L=
FB3 5

I'm seeing this on 32-bit Solaris/x86, but there are also reports for
Linux/x86.

This is most likely due to

commit e69ac0203725fb8da83a1cc88d32191b7a0b2c0c
Author: Bernd Edlinger <bernd.edlinger@hotmail.de>
Date:   Tue Jan 12 16:27:53 2021 +0100

    Add line debug info for virtual thunks

the number of LFB3 instances increased from the expected 5 to 8.=