[Bug 3645] New: -fzero-call-used-regs=used detection seems to fail on Linux ppc64el

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3645

            Bug ID: 3645
           Summary: -fzero-call-used-regs=used detection seems to fail on
                    Linux ppc64el
           Product: Portable OpenSSH
           Version: 9.6p1
          Hardware: PPC64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Build system
          Assignee: unassigned-bugs at mindrot.org
          Reporter: cjwatson at debian.org

9.6p1 failed to build on Debian ppc64(el) with this error:

  ../../cipher.c: In function ‘compression_alg_list’:
  ../../cipher.c:151:1: sorry, unimplemented: argument ‘used’ is not
supported for ‘-fzero-call-used-regs’ on this target
    151 | }
        | ^

A complete build log is at
https://buildd.debian.org/status/fetch.php?pkg=openssh&arch=ppc64el&ver=1%3A9.6p1-1&stamp=1702942848&raw=0.

I have a shell on a relevant machine and am happy to try adding more
things to the conftest.c code that tries to provoke this sort of error,
but I'm not quite sure what to try for myself.  Any suggestions?

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