[Bug 3673] New: -fzero-call-used-regs=used detection fails on Linux m68k with GCC 13

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3673

            Bug ID: 3673
           Summary: -fzero-call-used-regs=used detection fails on Linux
                    m68k with GCC 13
           Product: Portable OpenSSH
           Version: 9.7p1
          Hardware: 68k
               URL: https://bugs.debian.org/1067243
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Build system
          Assignee: unassigned-bugs at mindrot.org
          Reporter: cjwatson at debian.org

Created attachment 3797
  --> https://bugzilla.mindrot.org/attachment.cgi?id=3797&action=edit
Extend -fzero-call-used-regs check to catch m68k gcc bug

Thorsten Glaser reported that there's an ICE in GCC 13 on Linux m68k
(https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110934) that's missed by
the autoconf machinery to detect whether -fzero-call-used-regs=used is
usable.  The attached patch beefs up the autoconf check a bit more so
that it notices this.

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