[Bug target/97107] libgo fails to build for power10

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97107

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Alan Modra <amodra@gcc.gnu.org>:

https://gcc.gnu.org/g:199baa71f7a6c8f255afdda03cd3b2644f8f0fcd

commit r11-3416-g199baa71f7a6c8f255afdda03cd3b2644f8f0fcd
Author: Alan Modra <amodra@gmail.com>
Date:   Fri Sep 18 23:03:11 2020 +0930

    [RS6000] PR97107, libgo fails to build for power10

    Calls from split-stack code to non-split-stack code need to expand
    mapped stack memory via __morestack.  Even tail calls.

    __morestack is quite a surprising function on powerpc in that it calls
    back to its caller, and a tail call will continue running in the
    context of extra mapped stack.

            PR target/97107
            * config/rs6000/rs6000-internal.h (struct rs6000_stack): Improve
            calls_p comment.
            * config/rs6000/rs6000-logue.c (rs6000_stack_info): Likewise.
            (rs6000_expand_split_stack_prologue): Emit the prologue for
            functions that make a sibling call.