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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-02 09:29:43 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-02 09:29:43 -0800 |
| commit | f9d14250071eda9972e4c9cea745a11185952114 (patch) | |
| tree | a8839b522bf83b96a238bd6cb0e88093731a1e24 /include/linux/compiler-gcc4.h | |
| parent | f153b82121b0366fe0e5f9553545cce237335175 (diff) | |
| download | lwn-f9d14250071eda9972e4c9cea745a11185952114.tar.gz lwn-f9d14250071eda9972e4c9cea745a11185952114.zip | |
Disallow gcc versions 4.1.{0,1}
These compiler versions are known to miscompile __weak functions and
thus generate kernels that don't necessarily work correctly. If a weak
function is int he same compilation unit as a caller, gcc may end up
inlining it, and thus binding the weak function too early.
See
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27781
for details.
Cc: Adrian Bunk <bunk@kernel.org>
Cc: Helge Deller <deller@gmx.de>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/compiler-gcc4.h')
| -rw-r--r-- | include/linux/compiler-gcc4.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/compiler-gcc4.h b/include/linux/compiler-gcc4.h index aa426214331b..09992718f9e8 100644 --- a/include/linux/compiler-gcc4.h +++ b/include/linux/compiler-gcc4.h @@ -2,6 +2,11 @@ #error "Please don't include <linux/compiler-gcc4.h> directly, include <linux/compiler.h> instead." #endif +/* GCC 4.1.[01] miscompiles __weak */ +#if __GNUC_MINOR__ == 1 && __GNUC_PATCHLEVEL__ <= 1 +# error Your version of gcc miscompiles the __weak directive +#endif + #define __used __attribute__((__used__)) #define __must_check __attribute__((warn_unused_result)) #define __compiler_offsetof(a,b) __builtin_offsetof(a,b) |