Commit a137802e authored by Linus Torvalds's avatar Linus Torvalds

Don't use '-fwrapv' compiler option: it's buggy in gcc-4.1.x

This causes kernel images that don't run init to completion with certain
broken gcc versions.

This fixes kernel bugzilla entry:

I suspect the gcc problem is this:

Fix the problem by using the -fno-strict-overflow flag instead, which
not only does not exist in the known-to-be-broken versions of gcc (it
was introduced later than fwrapv), but seems to be much less disturbing
to gcc too: the difference in the generated code by -fno-strict-overflow
are smaller (compared to using neither flag) than when using -fwrapv.
Reported-by: default avatarBarry K. Nathan <>
Pushed-by: default avatarFrans Pop <>
Cc: Andrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 8b9f2caa
......@@ -565,7 +565,7 @@ 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 += $(call cc-option,-fno-strict-overflow)
# revert to pre-gcc-4.4 behaviour of .eh_frame
KBUILD_CFLAGS += $(call cc-option,-fno-dwarf2-cfi-asm)
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