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MdePkg: Use builtin offsetof function for GCC 4.0 and newer

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GCC 4.0 and newer have a builtin function for implementing
'offsetof' therefore we make use of it for our OFFSET_OF
macro.

References:
http://gcc.gnu.org/onlinedocs/gcc-4.0.0/gcc/Offsetof.html
http://gcc.gnu.org/onlinedocs/gcc-4.5.1/gcc/Offsetof.html

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10931 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
jljusten 2010-10-13 07:08:06 +00:00
parent 2b0fcbf537
commit 818ff8c267
1 changed files with 117 additions and 109 deletions
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8
MdePkg/Include/Base.h
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@ -573,7 +573,15 @@ typedef UINTN *BASE_LIST;
@return Offset, in bytes, of field.
**/
#ifdef __GNUC__
#if __GNUC__ >= 4
#define OFFSET_OF(TYPE, Field) ((UINTN) __builtin_offsetof(TYPE, Field))
#endif
#endif
#ifndef OFFSET_OF
#define OFFSET_OF(TYPE, Field) ((UINTN) &(((TYPE *)0)->Field))
#endif
/**
Macro that returns a pointer to the data structure that contains a specified field of