[PATCH] Turn off sibling call optimization w/ frame pointers

[Matthias Urlichs <smurf@smurf.noris.de>]

Frame pointers are supposed to enable debuggers to reliably tell
where a call comes from. That is defeated by GCC's sibling call
optimization (aka tail recursion elimination).

This patch turns this optimization off when compiling with frame pointers.

Signed-Off-By: Matthias Urlichs <smurf@smurf.noris.de>

---
Index: Makefile
===================================================================
--- cf96cb2bd8bb633b174549815ad3c45f65ae2848/Makefile  (mode:100644)
+++ df32987da12629d4a4498fc8948bf11b1a49d377/Makefile  (mode:100644)
@@ -518,7 +518,7 @@
 CFLAGS		+= $(call add-align,CONFIG_CC_ALIGN_JUMPS,-jumps)
 
 ifdef CONFIG_FRAME_POINTER
-CFLAGS		+= -fno-omit-frame-pointer
+CFLAGS		+= -fno-omit-frame-pointer $(call cc-option,-fno-optimize-sibling-calls,)
 else
 CFLAGS		+= -fomit-frame-pointer
 endif
-
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