Original patch from: gentoo/src/patchsets/glibc/2.9/0070_all_glibc-i386-x86_64-revert-clone-cfi.patch

-= BEGIN original header =-
revert cfi additions to clone on i386/x86_64 to workaround problems in
gcc's unwinder code.  this is not a bug in glibc, it triggers problems
elsewhere.  this cfi code does not gain us a whole lot anyways.

http://gcc.gnu.org/ml/gcc/2006-12/msg00293.html

-= END original header =-

diff -durN glibc-2_9.orig/sysdeps/unix/sysv/linux/i386/clone.S glibc-2_9/sysdeps/unix/sysv/linux/i386/clone.S
--- glibc-2_9.orig/sysdeps/unix/sysv/linux/i386/clone.S	2006-12-04 00:12:36.000000000 +0100
+++ glibc-2_9/sysdeps/unix/sysv/linux/i386/clone.S	2009-02-02 22:00:45.000000000 +0100
@@ -120,9 +120,6 @@
 	ret
 
 L(thread_start):
-	cfi_startproc;
-	/* Clearing frame pointer is insufficient, use CFI.  */
-	cfi_undefined (eip);
 	/* Note: %esi is zero.  */
 	movl	%esi,%ebp	/* terminate the stack frame */
 #ifdef RESET_PID
@@ -155,7 +152,6 @@
 	jmp	L(haspid)
 	.previous
 #endif
-	cfi_endproc;
 
 	cfi_startproc
 PSEUDO_END (BP_SYM (__clone))
diff -durN glibc-2_9.orig/sysdeps/unix/sysv/linux/x86_64/clone.S glibc-2_9/sysdeps/unix/sysv/linux/x86_64/clone.S
--- glibc-2_9.orig/sysdeps/unix/sysv/linux/x86_64/clone.S	2006-12-04 00:12:36.000000000 +0100
+++ glibc-2_9/sysdeps/unix/sysv/linux/x86_64/clone.S	2009-02-02 22:00:45.000000000 +0100
@@ -89,9 +89,6 @@
 	ret
 
 L(thread_start):
-	cfi_startproc;
-	/* Clearing frame pointer is insufficient, use CFI.  */
-	cfi_undefined (rip);
 	/* Clear the frame pointer.  The ABI suggests this be done, to mark
 	   the outermost frame obviously.  */
 	xorl	%ebp, %ebp
@@ -116,7 +113,6 @@
 	/* Call exit with return value from function call. */
 	movq	%rax, %rdi
 	call	HIDDEN_JUMPTARGET (_exit)
-	cfi_endproc;
 
 	cfi_startproc;
 PSEUDO_END (BP_SYM (__clone))