From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Thu, 19 Mar 2009 18:10:17 +0000 (-0700)
Subject: Add '-fwrapv' to gcc CFLAGS
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=68df3755e383e6fecf2354a67b08f92f18536594;p=linux-2.6-omap-h63xx.git

Add '-fwrapv' to gcc CFLAGS

This makes sure that gcc doesn't try to optimize away wrapping
arithmetic, which the kernel occasionally uses for overflow testing, ie
things like

	if (ptr + offset < ptr)

which technically is undefined for non-unsigned types. See

	http://bugzilla.kernel.org/show_bug.cgi?id=12597

for details.

Not all versions of gcc support it, so we need to make it conditional
(it looks like it was introduced in gcc-3.4).

Reminded-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/Makefile b/Makefile
index 2e2f4a4324a..f607658ac89 100644
--- a/Makefile
+++ b/Makefile
@@ -347,6 +347,7 @@ KBUILD_CPPFLAGS := -D__KERNEL__
 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 		   -fno-strict-aliasing -fno-common \
 		   -Werror-implicit-function-declaration
+KBUILD_CFLAGS	+= $(call cc-option,-fwrapv)
 KBUILD_AFLAGS   := -D__ASSEMBLY__
 
 # Read KERNELRELEASE from include/config/kernel.release (if it exists)