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1 | #ifndef __LINUX_COMPILER_H |
2 | #error "Please don't include <linux/compiler-gcc4.h> directly, include <linux/compiler.h> instead." |
3 | #endif |
4 | |
5 | /* GCC 4.1.[01] miscompiles __weak */ |
6 | #ifdef __KERNEL__ |
7 | # if GCC_VERSION >= 40100 && GCC_VERSION <= 40101 |
8 | # error Your version of gcc miscompiles the __weak directive |
9 | # endif |
10 | #endif |
11 | |
12 | #define __used __attribute__((__used__)) |
13 | #define __must_check __attribute__((warn_unused_result)) |
14 | #define __compiler_offsetof(a,b) __builtin_offsetof(a,b) |
15 | |
16 | #if GCC_VERSION >= 40100 && GCC_VERSION < 40600 |
17 | # define __compiletime_object_size(obj) __builtin_object_size(obj, 0) |
18 | #endif |
19 | |
20 | #if GCC_VERSION >= 40300 |
21 | /* Mark functions as cold. gcc will assume any path leading to a call |
22 | to them will be unlikely. This means a lot of manual unlikely()s |
23 | are unnecessary now for any paths leading to the usual suspects |
24 | like BUG(), printk(), panic() etc. [but let's keep them for now for |
25 | older compilers] |
26 | |
27 | Early snapshots of gcc 4.3 don't support this and we can't detect this |
28 | in the preprocessor, but we can live with this because they're unreleased. |
29 | Maketime probing would be overkill here. |
30 | |
31 | gcc also has a __attribute__((__hot__)) to move hot functions into |
32 | a special section, but I don't see any sense in this right now in |
33 | the kernel context */ |
34 | #define __cold __attribute__((__cold__)) |
35 | |
36 | #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__) |
37 | |
38 | #ifndef __CHECKER__ |
39 | # define __compiletime_warning(message) __attribute__((warning(message))) |
40 | # define __compiletime_error(message) __attribute__((error(message))) |
41 | #endif /* __CHECKER__ */ |
42 | #endif /* GCC_VERSION >= 40300 */ |
43 | |
44 | #if GCC_VERSION >= 40500 |
45 | /* |
46 | * Mark a position in code as unreachable. This can be used to |
47 | * suppress control flow warnings after asm blocks that transfer |
48 | * control elsewhere. |
49 | * |
50 | * Early snapshots of gcc 4.5 don't support this and we can't detect |
51 | * this in the preprocessor, but we can live with this because they're |
52 | * unreleased. Really, we need to have autoconf for the kernel. |
53 | */ |
54 | #define unreachable() __builtin_unreachable() |
55 | |
56 | /* Mark a function definition as prohibited from being cloned. */ |
57 | #define __noclone __attribute__((__noclone__)) |
58 | |
59 | #endif /* GCC_VERSION >= 40500 */ |
60 | |
61 | #if GCC_VERSION >= 40600 |
62 | /* |
63 | * Tell the optimizer that something else uses this function or variable. |
64 | */ |
65 | #define __visible __attribute__((externally_visible)) |
66 | #endif |
67 | |
68 | /* |
69 | * GCC 'asm goto' miscompiles certain code sequences: |
70 | * |
71 | * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58670 |
72 | * |
73 | * Work it around via a compiler barrier quirk suggested by Jakub Jelinek. |
74 | * Fixed in GCC 4.8.2 and later versions. |
75 | * |
76 | * (asm goto is automatically volatile - the naming reflects this.) |
77 | */ |
78 | #if GCC_VERSION <= 40801 |
79 | # define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) |
80 | #else |
81 | # define asm_volatile_goto(x...) do { asm goto(x); } while (0) |
82 | #endif |
83 | |
84 | #ifdef CONFIG_ARCH_USE_BUILTIN_BSWAP |
85 | #if GCC_VERSION >= 40400 |
86 | #define __HAVE_BUILTIN_BSWAP32__ |
87 | #define __HAVE_BUILTIN_BSWAP64__ |
88 | #endif |
89 | #if GCC_VERSION >= 40800 || (defined(__powerpc__) && GCC_VERSION >= 40600) |
90 | #define __HAVE_BUILTIN_BSWAP16__ |
91 | #endif |
92 | #endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */ |
93 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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v3.9