[Bug c/108500] New: -O -finline-small-functions results in "internal compiler error: Segmentation fault" on a very large program (700k function calls)

["dhekir at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108500

            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=54328&action=edit
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. Still,
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 happens.