diff options
Diffstat (limited to 'backport/backport-include/linux/build_bug.h')
| -rw-r--r-- | backport/backport-include/linux/build_bug.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/backport/backport-include/linux/build_bug.h b/backport/backport-include/linux/build_bug.h index 13ee5d6a..c883e525 100644 --- a/backport/backport-include/linux/build_bug.h +++ b/backport/backport-include/linux/build_bug.h @@ -7,4 +7,25 @@ #include <linux/bug.h> #endif /* LINUX_VERSION_IS_GEQ(4,13,0) */ +#ifndef static_assert +/** + * static_assert - check integer constant expression at build time + * + * static_assert() is a wrapper for the C11 _Static_assert, with a + * little macro magic to make the message optional (defaulting to the + * stringification of the tested expression). + * + * Contrary to BUILD_BUG_ON(), static_assert() can be used at global + * scope, but requires the expression to be an integer constant + * expression (i.e., it is not enough that __builtin_constant_p() is + * true for expr). + * + * Also note that BUILD_BUG_ON() fails the build if the condition is + * true, while static_assert() fails the build if the expression is + * false. + */ +#define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr) +#define __static_assert(expr, msg, ...) _Static_assert(expr, msg) +#endif + #endif /* __BP_BUILD_BUG_H */ |