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Merge branch '3371-check-for-__attribute__-fallthrough-support-is-sometimes-incorrect' into 'main'

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Use C2x [[fallthrough]] when supported by LLVM/clang

Closes #3371

See merge request isc-projects/bind9!6338
This commit is contained in:
Ondřej Surý
2022-05-19 20:01:06 +00:00
parent c9aca34b1e 14c8d43863
commit c0d62c9287
1 changed files with 7 additions and 1 deletions
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8
lib/isc/include/isc/util.h
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@@ -35,6 +35,10 @@
#define __has_attribute(x) 0
#endif /* if !defined(__has_attribute) */
#if !defined(__has_c_attribute)
#define __has_c_attribute(x) 0
#endif /* if !defined(__has_c_attribute) */
#if !defined(__has_feature)
#define __has_feature(x) 0
#endif /* if !defined(__has_feature) */
@@ -61,7 +65,9 @@
#define ISC_NONSTRING
#endif /* __GNUC__ */
#if __GNUC__ >= 7 || __has_attribute(fallthrough)
#if __has_c_attribute(fallthrough)
#define FALLTHROUGH [[fallthrough]]
#elif __GNUC__ >= 7 && !defined(__clang__)
#define FALLTHROUGH __attribute__((fallthrough))
#else
/* clang-format off */