1 #ifndef __LINUX_COMPILER_H
2 #error "Please don't include <linux/compiler-gcc4.h> directly, include <linux/compiler.h> instead."
5 /* GCC 4.1.[01] miscompiles __weak */
7 # if __GNUC_MINOR__ == 1 && __GNUC_PATCHLEVEL__ <= 1
8 # error Your version of gcc miscompiles the __weak directive
12 #define __used __attribute__((__used__))
13 #define __must_check __attribute__((warn_unused_result))
14 #define __compiler_offsetof(a,b) __builtin_offsetof(a,b)
16 #if __GNUC_MINOR__ >= 3
17 /* Mark functions as cold. gcc will assume any path leading to a call
18 to them will be unlikely. This means a lot of manual unlikely()s
19 are unnecessary now for any paths leading to the usual suspects
20 like BUG(), printk(), panic() etc. [but let's keep them for now for
23 Early snapshots of gcc 4.3 don't support this and we can't detect this
24 in the preprocessor, but we can live with this because they're unreleased.
25 Maketime probing would be overkill here.
27 gcc also has a __attribute__((__hot__)) to move hot functions into
28 a special section, but I don't see any sense in this right now in
30 #define __cold __attribute__((__cold__))
33 #if __GNUC_MINOR__ >= 5
35 * Mark a position in code as unreachable. This can be used to
36 * suppress control flow warnings after asm blocks that transfer
39 * Early snapshots of gcc 4.5 don't support this and we can't detect
40 * this in the preprocessor, but we can live with this because they're
41 * unreleased. Really, we need to have autoconf for the kernel.
43 #define unreachable() __builtin_unreachable()
45 /* Mark a function definition as prohibited from being cloned. */
46 #define __noclone __attribute__((__noclone__))
51 #if __GNUC_MINOR__ > 0
52 #define __compiletime_object_size(obj) __builtin_object_size(obj, 0)
54 #if __GNUC_MINOR__ >= 4 && !defined(__CHECKER__)
55 #define __compiletime_warning(message) __attribute__((warning(message)))
56 #define __compiletime_error(message) __attribute__((error(message)))
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