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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 | #define __always_inline inline __attribute__((always_inline)) |
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16 | |||
17 | /* |
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18 | * A trick to suppress uninitialized variable warning without generating any |
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19 | * code |
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20 | */ |
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21 | #define uninitialized_var(x) x = x |
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22 | |||
23 | #if __GNUC_MINOR__ >= 3 |
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24 | /* Mark functions as cold. gcc will assume any path leading to a call |
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25 | to them will be unlikely. This means a lot of manual unlikely()s |
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26 | are unnecessary now for any paths leading to the usual suspects |
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27 | like BUG(), printk(), panic() etc. [but let's keep them for now for |
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28 | older compilers] |
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29 | |||
30 | Early snapshots of gcc 4.3 don't support this and we can't detect this |
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31 | in the preprocessor, but we can live with this because they're unreleased. |
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32 | Maketime probing would be overkill here. |
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33 | |||
34 | gcc also has a __attribute__((__hot__)) to move hot functions into |
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35 | a special section, but I don't see any sense in this right now in |
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36 | the kernel context */ |
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37 | #define __cold __attribute__((__cold__)) |
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38 | |||
39 | |||
40 | #if __GNUC_MINOR__ >= 5 |
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41 | /* |
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42 | * Mark a position in code as unreachable. This can be used to |
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43 | * suppress control flow warnings after asm blocks that transfer |
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44 | * control elsewhere. |
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45 | * |
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46 | * Early snapshots of gcc 4.5 don't support this and we can't detect |
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47 | * this in the preprocessor, but we can live with this because they're |
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48 | * unreleased. Really, we need to have autoconf for the kernel. |
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49 | */ |
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50 | #define unreachable() __builtin_unreachable() |
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1964 | serge | 51 | |
52 | /* Mark a function definition as prohibited from being cloned. */ |
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53 | #define __noclone __attribute__((__noclone__)) |
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54 | |||
1408 | serge | 55 | #endif |
56 | |||
57 | #endif |
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58 | |||
59 | #if __GNUC_MINOR__ > 0 |
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60 | #define __compiletime_object_size(obj) __builtin_object_size(obj, 0) |
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61 | #endif |
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62 | #if __GNUC_MINOR__ >= 4 |
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63 | #define __compiletime_warning(message) __attribute__((warning(message))) |
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64 | #define __compiletime_error(message) __attribute__((error(message))) |
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65 | #endif=> |