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fiddle: Use C11 _Alignof to define ALIGN_OF when possible #120

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Merged
kou merged 2 commits into from
Jan 25, 2023
Merged

fiddle: Use C11 _Alignof to define ALIGN_OF when possible #120

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fiddle: Use C11 _Alignof to define ALIGN_OF when possible
kraj Jan 15, 2023
558a880
Add missing parenthesis
kou Jan 25, 2023
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12 changes: 11 additions & 1 deletion ext/fiddle/fiddle.h
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Original file line number Diff line number Diff line change
Expand Up @@ -196,7 +196,17 @@
#endif
#define TYPE_UINTPTR_T (-TYPE_INTPTR_T)

#define ALIGN_OF(type) offsetof(struct {char align_c; type align_x;}, align_x)
/* GCC releases before GCC 4.9 had a bug in _Alignof. See GCC bug 52023
<https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52023>.
clang versions < 8.0.0 have the same bug. */
#if (!defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112 \
|| (defined(__GNUC__) && __GNUC__ < 4 + (__GNUC_MINOR__ < 9) \
&& !defined(__clang__)) \
|| (defined(__clang__) && __clang_major__ < 8))
# define ALIGN_OF(type) offsetof(struct {char align_c; type align_x;}, align_x)
#else
# define ALIGN_OF(type) _Alignof(type)
#endif

#define ALIGN_VOIDP ALIGN_OF(void*)
#define ALIGN_CHAR ALIGN_OF(char)
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