https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121159
--- Comment #21 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I must say I'm not sure how musttail calls work at all on SPARC at -O0.
The thing is sparc_function_ok_for_sibcall depends on flag_delayed_branch and
that is only enabled by default for -O1 and higher.
Perhaps we need to enable some subset of delayed branch processing in
cfun->has_musttail functions even if !flag_delayed_branch?
As a temporary workaround, perhaps the test could have /* {
dg-additional-options "-fdelayed-branch" { target sparc*-*-* } } */ or so.
