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[RFC]: append dwarf2 unwinder on sparc


as gcc 4.9 has switched to dwarf-4 by default, it now emits DW_OP_call_frame_cfa.
But gdb is able to handle it only if the frame was unwinded by dwarf2
(See dwarf2-frame.c:dwarf2_frame_cfa)

Is there any reason not to append the dwarf2 unwinder on sparc ?


	* sparc-tdep.c (sparc32_gdbarch_init): Call dwarf2_append_unwinders.

diff --git a/gdb/sparc-tdep.c b/gdb/sparc-tdep.c
index e7b3090..5b8ad38 100644
--- a/gdb/sparc-tdep.c
+++ b/gdb/sparc-tdep.c
@@ -1739,6 +1739,11 @@ sparc32_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   /* Hook in ABI-specific overrides, if they have been registered.  */
   gdbarch_init_osabi (info, gdbarch);
+  /* Hook in the DWARF CFI frame unwinder.  This unwinder is appended
+     to the list before the prologue-based unwinders, so that DWARF
+     CFI info will be used if it is available.  */
+  dwarf2_append_unwinders (gdbarch);
   frame_unwind_append_unwinder (gdbarch, &sparc32_frame_unwind);
   /* If we have register sets, enable the generic core file support.  */

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