Bug#536354: linux-2.6: [s390,lenny] kernel panic during boot
On Friday 10 July 2009, Frans Pop wrote:
> I've proposed the attached patch on lkml:
> http://lkml.org/lkml/2009/7/10/49.
The version check in the patch was incorrect. Here's an improved version
that also allows -fwrapv for gcc 4.2.
See also the follow ups on lkml.
From: Frans Pop <elendil@planet.nl>
Subject: Only add '-fwrapv' to gcc CFLAGS for gcc 4.2 and later
This flag has been shown to cause init to segfault for kernels
compiled with gcc-4.1. gcc version 4.2.4 has been shown to be OK.
This fixes http://bugzilla.kernel.org/show_bug.cgi?id=13012.
Reported-by: Barry K. Nathan <barryn@pobox.com>
Signed-off-by: Frans Pop <elendil@planet.nl>
diff --git a/Makefile b/Makefile
index 0aeec59..2519fde 100644
--- a/Makefile
+++ b/Makefile
@@ -565,7 +565,8 @@ KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
# disable invalid "can't wrap" optimizations for signed / pointers
-KBUILD_CFLAGS += $(call cc-option,-fwrapv)
+KBUILD_CFLAGS += $(shell if [ $(call cc-version) -ge 0402 ]; then \
+ echo $(call cc-option,-fwrapv); fi ;)
# revert to pre-gcc-4.4 behaviour of .eh_frame
KBUILD_CFLAGS += $(call cc-option,-fno-dwarf2-cfi-asm)
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