[Bug 3673] -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

--- Comment #3 from Colin Watson <cjwatson at debian.org> ---
Created attachment 3803
  --> https://bugzilla.mindrot.org/attachment.cgi?id=3803&action=edit
Add Autoconf cache variables for OSSH_CHECK_*FLAG_*

How about this?  Briefly tested, but it seems to do the job.  For
example:

  $ ./configure ossh_cv_cflag__fzero_call_used_regs_used=no
  [...]
  checking if cc supports compile flag -ftrapv and linking succeeds...
yes
  checking if cc supports compile flag -fzero-call-used-regs=used and
linking succeeds... (cached) no
  checking if cc supports compile flag -ftrivial-auto-var-init=zero...
yes

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