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Improve STATIC_ASSERT macro for older compilers

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Previously, when using compiler without support for static assertions,
the STATIC_ASSERT() macro would be replaced with runtime assertion.
Change the STATIC_ASSERT() macro to a version that's compile time
assertion even when using pre-C11 compilers.

Courtesy of Joseph Quinsey: https://godbolt.org/z/K9RvWS
This commit is contained in:
Ondřej Surý
2021-10-04 17:14:53 +02:00
parent 9f5985bae5
commit 804ec1bcaa
1 changed files with 6 additions and 1 deletions
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7
lib/isc/include/isc/util.h
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@@ -228,7 +228,12 @@
#elif __has_feature(c_static_assert)
#define STATIC_ASSERT(cond, msg) _Static_assert(cond, msg)
#else /* if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR >= 6) */
#define STATIC_ASSERT(cond, msg) INSIST(cond)
/* Courtesy of Joseph Quinsey: https://godbolt.org/z/K9RvWS */
#define TOKENPASTE(a, b) a##b /* "##" is the "Token Pasting Operator" */
#define EXPAND_THEN_PASTE(a, b) TOKENPASTE(a, b) /* expand then paste */
#define STATIC_ASSERT(x, msg) \
enum { EXPAND_THEN_PASTE(ASSERT_line_, __LINE__) = 1 / ((msg) && (x)) }
#endif /* if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR >= 6) */
#ifdef UNIT_TESTING