[PATCH] support: Use unwinder in links-dso-program-c only with libgcc_s

[Joseph Myers]

On Wed, 26 Mar 2025, Florian Weimer wrote:

> Do not build links-dso-program-c with exception (unwinding) support
> if libgcc_s is not available.  In this case, the unwinder may be
> part of libgcc.a or libgcc_eh.a, depending on how GCC was built.
> If the unwinder is in libgcc_eh.a only, linking links-dso-program-c
> failed before this change.  After this change, the exception
> handling landing pad is only generated if libgcc_s available,
> avoiding an undefined _Unwind_Resume (or equivalent) symbol
> reference in the non-libgcc_s case.
> 
> Fixes commit ffd36cc27407003a6f9efcb9c16370e3435c5b1d ("support: Use
> unwinder in links-dso-program-c only with libgcc_s") and
> commit 5dfbc3c43ecc1bcfc760a032c91bb002660051bc ("support: Link
> links-dso-program-c with libgcc_s only if available").

This is OK.

-- 
Joseph S. Myers
josmyers@redhat.com