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gmacros: Use _Static_assert when C11 is available

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The static assert message is much nicer to read, and is less likely to
be misinterpreted as a false positive.

glib is built with `-std=gnu89`, but this macro will be available to
projects that use glib with c11 or gnu11.
This commit is contained in:
Nirbheek Chauhan 2019-06-27 13:37:58 +05:30
parent 6a291b3e84
commit 5d14764a6b
1 changed files with 9 additions and 1 deletions
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10
glib/gmacros.h
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@ -734,13 +734,21 @@
#ifndef __GI_SCANNER__ /* The static assert macro really confuses the introspection parser */
#define G_PASTE_ARGS(identifier1,identifier2) identifier1 ## identifier2
#define G_PASTE(identifier1,identifier2) G_PASTE_ARGS (identifier1, identifier2)
#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
#define G_STATIC_ASSERT(expr) _Static_assert (expr, "Expression evaluates to false")
#define G_STATIC_ASSERT_EXPR(expr) _Static_assert (expr, "Expression evaluates to false")
#elif defined(__cplusplus) && __cplusplus >= 201103L
#define G_STATIC_ASSERT(expr) static_assert (expr, "Expression evaluates to false")
#define G_STATIC_ASSERT_EXPR(expr) static_assert (expr, "Expression evaluates to false")
#else
#ifdef __COUNTER__
#define G_STATIC_ASSERT(expr) typedef char G_PASTE (_GStaticAssertCompileTimeAssertion_, __COUNTER__)[(expr) ? 1 : -1] G_GNUC_UNUSED
#else
#define G_STATIC_ASSERT(expr) typedef char G_PASTE (_GStaticAssertCompileTimeAssertion_, __LINE__)[(expr) ? 1 : -1] G_GNUC_UNUSED
#endif
#define G_STATIC_ASSERT_EXPR(expr) ((void) sizeof (char[(expr) ? 1 : -1]))
#endif
#endif /* __STDC_VERSION__ */
#endif /* !__GI_SCANNER__ */
/* Provide a string identifying the current code position */
#if defined(__GNUC__) && (__GNUC__ < 3) && !defined(__cplusplus)