From: Matthias Urlichs <smurf@smurf.noris.de>
Date: Thu, 23 Jun 2005 07:10:05 +0000 (-0700)
Subject: [PATCH] Turn off sibling call optimization w/ frame pointers
X-Git-Tag: v2.6.13-rc4~130^2~30
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=0030cbf06c669b65e124414af51b5010fc53b760;p=linux-2.6-omap-h63xx.git

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

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>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/Makefile b/Makefile
index 0d1e74d5006..fad349724e9 100644
--- a/Makefile
+++ b/Makefile
@@ -518,7 +518,7 @@ CFLAGS		+= $(call add-align,CONFIG_CC_ALIGN_LOOPS,-loops)
 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