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The GCC compiler’s behavior is different than the Microsoft compilers for statically linked vararg functions. The GCC compilers do provide __builtin_ functions for accessing varargs. we should use these intrinsic functions with GCC 

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@8260 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
eric_tian 2009-05-08 02:27:46 +00:00
parent 7c9d25ae76
commit 130a2eecc4
1 changed files with 15 additions and 0 deletions
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15
MdePkg/Include/Base.h
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@ -332,7 +332,20 @@ struct _LIST_ENTRY {
// return Result
// }
//
#if defined(__GNUC__)
//
// In GCC compiler, its behavior for statically linked varargs is different with MSFT tool chain.
// Should use __builtin_* intrinsic functions provided by GCC compiler to access varargs.
//
typedef __builtin_va_list VA_LIST;
#define VA_START(Marker, Parameter) __builtin_va_start(Marker, Parameter)
#define VA_ARG(Marker, TYPE) __builtin_va_arg(Marker, TYPE)
#define VA_END(Marker) __builtin_va_end(Marker)
#else
/**
Return the size of argument that has been aligned to sizeof (UINTN).
@ -394,6 +407,8 @@ typedef CHAR8 *VA_LIST;
**/
#define VA_END(Marker) (Marker = (VA_LIST) 0)
#endif
/**
Macro that returns the byte offset of a field in a data structure.