Add '-fwrapv' to gcc CFLAGS
authorLinus Torvalds <torvalds@linux-foundation.org>
Thu, 19 Mar 2009 18:10:17 +0000 (11:10 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 19 Mar 2009 18:10:17 +0000 (11:10 -0700)
commit68df3755e383e6fecf2354a67b08f92f18536594
treea5091127ecb61f30c448ec2abb534509791a7d19
parenta1e4ee22863d41a6fbb24310d7951836cb6dafe7
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>
Makefile