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lib: Use offsetof() builtin with GCC

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The default offsetof() implementation generates a warning
(variably modified <variable> at file scope) when used in
to define the size of an array. By using this builtin with
GCC we avoid the warning and make sure no variable-size
arrays are used.

Change-Id: Iae215f777241f7daaa061067230086dffaa8311d
Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>
This commit is contained in:
Carles Cufi 2016-08-23 09:41:17 -07:00 • committed by Anas Nashif
commit 1980b7bb0f
1 changed files with 4 additions and 0 deletions
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4
lib/libc/minimal/include/stddef.h
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@ -27,6 +27,10 @@
typedef int ptrdiff_t; typedef int ptrdiff_t;
#endif #endif
#if defined(__GNUC__)
#define offsetof(type, member) __builtin_offsetof(type, member)
#else
#define offsetof(type, member) ((size_t) (&((type *) NULL)->member)) #define offsetof(type, member) ((size_t) (&((type *) NULL)->member))
#endif
#endif /* __INC_stddef_h__ */ #endif /* __INC_stddef_h__ */