[gcc r12-4954] Darwin, crts: Fix a build warning.

[gcc r12-4954] Darwin, crts: Fix a build warning.

[Iain D Sandoe]

https://gcc.gnu.org/g:7a300b413a62e1989bd89064fd5594aabe371d3a

commit r12-4954-g7a300b413a62e1989bd89064fd5594aabe371d3a
Author: Iain Sandoe <iain@sandoe.co.uk>
Date:   Mon Nov 1 16:58:20 2021 +0000

    Darwin, crts: Fix a build warning.
    
    We have a shim crt for Darwin10 that implements functionality
    missing in libSystem. Provide this with a prototype to silence the
    warning about this.
    
    libgcc/ChangeLog:
    
            * config/darwin10-unwind-find-enc-func.c: Include libgcc_tm.h.
            * config/i386/darwin-lib.h: Declare Darwin10 crt function.
    
    Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>

Diff:
---
 libgcc/config/darwin10-unwind-find-enc-func.c | 1 +
 libgcc/config/i386/darwin-lib.h               | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/libgcc/config/darwin10-unwind-find-enc-func.c b/libgcc/config/darwin10-unwind-find-enc-func.c
index 67c43757e50..882ec3a2372 100644
--- a/libgcc/config/darwin10-unwind-find-enc-func.c
+++ b/libgcc/config/darwin10-unwind-find-enc-func.c
@@ -1,6 +1,7 @@
 #include "tconfig.h"
 #include "tsystem.h"
 #include "unwind-dw2-fde.h"
+#include "libgcc_tm.h"
 
 void *
 _darwin10_Unwind_FindEnclosingFunction (void *pc)
diff --git a/libgcc/config/i386/darwin-lib.h b/libgcc/config/i386/darwin-lib.h
index e424b8820bb..5aeee335348 100644
--- a/libgcc/config/i386/darwin-lib.h
+++ b/libgcc/config/i386/darwin-lib.h
@@ -30,3 +30,5 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 #define DECLARE_LIBRARY_RENAMES \
   asm(".text; ___divdc3: jmp ___ieee_divdc3 ; .globl ___divdc3");
 #endif
+
+extern void * _darwin10_Unwind_FindEnclosingFunction (void *);