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From: "dhekir at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/108500] New: -O -finline-small-functions results in "internal
 compiler error: Segmentation fault" on a very large program (700k function
 calls)
Date: Mon, 23 Jan 2023 17:30:27 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108500

            Bug ID: 108500
           Summary: -O -finline-small-functions results in "internal
                    compiler error: Segmentation fault" on a very large
                    program (700k function calls)
           Product: gcc
           Version: 12.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dhekir at gmail dot com
  Target Milestone: ---

Created attachment 54328
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D54328&action=3Dedit
compressed version of a simplified program causing the ICE

In the attached preprocessed program (compressed with .tar.gz), running
'gcc -O -finline-small-functions' results in:

gcc: internal compiler error: Segmentation fault signal terminated program =
cc1

The original program is more interesting than this simplified version. Stil=
l,
it does have more than 700k function calls in the main function, which is
causing the problem.

The original command line was simply 'gcc -O2', then I narrowed the options
down to -finline-small-functions.

I tried several GCC Docker images (running 'gcc -O2' on the attached file),=
 and
I narrowed it down to:

- with gcc:10.4 (or older), compilation works without any errors;
- with gcc:11.1 (or newer; I tested up to 12.2.0), segmentation fault happe=
ns.=