diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-03-19 11:10:17 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-03-19 11:10:17 -0700 |
commit | 68df3755e383e6fecf2354a67b08f92f18536594 (patch) | |
tree | a5091127ecb61f30c448ec2abb534509791a7d19 /fs/adfs | |
parent | a1e4ee22863d41a6fbb24310d7951836cb6dafe7 (diff) |
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>
Diffstat (limited to 'fs/adfs')
0 files changed, 0 insertions, 0 deletions