Hi!

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.

Bootstrapped/regtested on powerpc64le-linux and powerpc64-linux (the latter
with -m32/-m64 testing), ok for trunk?

2021-11-09  Jakub Jelinek  <ja...@redhat.com>

        * config/rs6000/linux-unwind.h (ppc_back_fallback): Make it static,
        formatting fix.

--- libgcc/config/rs6000/linux-unwind.h.jj      2021-10-15 11:59:16.227682621 
+0200
+++ libgcc/config/rs6000/linux-unwind.h 2021-11-09 11:42:06.840353422 +0100
@@ -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;

        Jakub

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