[gcc r12-5103] rs6000, libgcc: Fix up -Wmissing-prototypes warning on rs6000/linux-unwind.h

[gcc r12-5103] rs6000, libgcc: Fix up -Wmissing-prototypes warning on rs6000/linux-unwind.h

[Jakub Jelinek]

https://gcc.gnu.org/g:75ef0353a2d31dad1bda8e35f1849024f7f1e941

commit r12-5103-g75ef0353a2d31dad1bda8e35f1849024f7f1e941
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Wed Nov 10 10:24:49 2021 +0100

    rs6000, libgcc: Fix up -Wmissing-prototypes warning on rs6000/linux-unwind.h
    
    Jonathan reported and I've verified a
    In file included from ../../../libgcc/unwind-dw2.c:412:
    ./md-unwind-support.h:398:6: warning: no previous prototype for ‘ppc_backchain_fallback’ [-Wmissing-prototypes]
      398 | void ppc_backchain_fallback (struct _Unwind_Context *context, void *a)
          |      ^~~~~~~~~~~~~~~~~~~~~~
    warning on powerpc*-linux* libgcc build.
    
    All the other MD_* macro functions are static, so I think the following
    is the right thing rather than adding a previous prototype for
    ppc_backchain_fallback.
    
    2021-11-10  Jakub Jelinek  <jakub@redhat.com>
    
            * config/rs6000/linux-unwind.h (ppc_back_fallback): Make it static,
            formatting fix.

Diff:
---
 libgcc/config/rs6000/linux-unwind.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libgcc/config/rs6000/linux-unwind.h b/libgcc/config/rs6000/linux-unwind.h
index 8deccc1d650..47884973ca5 100644
--- a/libgcc/config/rs6000/linux-unwind.h
+++ b/libgcc/config/rs6000/linux-unwind.h
@@ -395,7 +395,8 @@ struct frame_layout
 };
 
 
-void ppc_backchain_fallback (struct _Unwind_Context *context, void *a)
+static void
+ppc_backchain_fallback (struct _Unwind_Context *context, void *a)
 {
   struct frame_layout *current;
   struct trace_arg *arg = a;