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1408 | serge | 1 | #ifndef __LINUX_COMPILER_H |
2 | #error "Please don't include |
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3 | #endif |
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4 | |||
5 | /* GCC 4.1.[01] miscompiles __weak */ |
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6 | #ifdef __KERNEL__ |
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7 | # if __GNUC_MINOR__ == 1 && __GNUC_PATCHLEVEL__ <= 1 |
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8 | # error Your version of gcc miscompiles the __weak directive |
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9 | # endif |
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10 | #endif |
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11 | |||
12 | #define __used __attribute__((__used__)) |
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13 | #define __must_check __attribute__((warn_unused_result)) |
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14 | #define __compiler_offsetof(a,b) __builtin_offsetof(a,b) |
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15 | |||
16 | #if __GNUC_MINOR__ >= 3 |
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17 | /* Mark functions as cold. gcc will assume any path leading to a call |
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18 | to them will be unlikely. This means a lot of manual unlikely()s |
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19 | are unnecessary now for any paths leading to the usual suspects |
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20 | like BUG(), printk(), panic() etc. [but let's keep them for now for |
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21 | older compilers] |
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22 | |||
23 | Early snapshots of gcc 4.3 don't support this and we can't detect this |
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24 | in the preprocessor, but we can live with this because they're unreleased. |
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25 | Maketime probing would be overkill here. |
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26 | |||
27 | gcc also has a __attribute__((__hot__)) to move hot functions into |
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28 | a special section, but I don't see any sense in this right now in |
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29 | the kernel context */ |
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30 | #define __cold __attribute__((__cold__)) |
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31 | |||
32 | |||
33 | #if __GNUC_MINOR__ >= 5 |
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34 | /* |
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35 | * Mark a position in code as unreachable. This can be used to |
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36 | * suppress control flow warnings after asm blocks that transfer |
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37 | * control elsewhere. |
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38 | * |
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39 | * Early snapshots of gcc 4.5 don't support this and we can't detect |
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40 | * this in the preprocessor, but we can live with this because they're |
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41 | * unreleased. Really, we need to have autoconf for the kernel. |
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42 | */ |
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43 | #define unreachable() __builtin_unreachable() |
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1964 | serge | 44 | |
45 | /* Mark a function definition as prohibited from being cloned. */ |
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46 | #define __noclone __attribute__((__noclone__)) |
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47 | |||
1408 | serge | 48 | #endif |
49 | #endif |
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50 | |||
51 | #if __GNUC_MINOR__ > 0 |
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52 | #define __compiletime_object_size(obj) __builtin_object_size(obj, 0) |
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53 | #endif |
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1970 | serge | 54 | #if __GNUC_MINOR__ >= 4 && !defined(__CHECKER__) |
1408 | serge | 55 | #define __compiletime_warning(message) __attribute__((warning(message))) |
56 | #define __compiletime_error(message) __attribute__((error(message))) |
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57 | #endif=> |