Commit f9d14250 authored Jan 02, 2009 by Linus Torvalds

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>

parent f153b821

include/linux/compiler-gcc4.h

+5 −0

Original line number	Diff line number	Diff line
		@@ -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)