[chore] Use gnu-efi as a part of project

efi/inc/efistdarg.h

@@ -0,0 +1,68 @@
+#ifndef _EFISTDARG_H_
+#define _EFISTDARG_H_
+
+/*++
+
+Copyright (c) 1998  Intel Corporation
+
+Module Name:
+
+    devpath.h
+
+Abstract:
+
+    Defines for parsing the EFI Device Path structures
+
+
+
+Revision History
+
+--*/
+
+/* Use somebody else's definitions */
+#if defined(GNU_EFI_USE_EXTERNAL_STDARG)
+#include <stdarg.h>
+#else
+
+/* MSVC */
+#if defined(_MSC_VER)
+#include <stdarg.h>
+typedef va_list ms_va_list;
+#define ms_va_start(v,l) va_start(v,l)
+#define ms_va_end(v) va_end(v)
+#define ms_va_arg(v,l) va_arg(v,l)
+#define ms_va_copy(d,s) va_copy(d,s)
+#endif
+
+/* GCC x86_64 */
+#if !defined(_MSC_VER) && defined(__x86_64__)
+typedef __builtin_va_list va_list;
+#define va_start(v,l) __builtin_va_start(v,l)
+#define va_end(v) __builtin_va_end(v)
+#define va_arg(v,l) __builtin_va_arg(v,l)
+#define va_copy(d,s) __builtin_va_copy(d,s)
+typedef __builtin_ms_va_list ms_va_list;
+#define ms_va_start(v,l) __builtin_ms_va_start(v,l)
+#define ms_va_end(v) __builtin_ms_va_end(v)
+#define ms_va_arg(v,l) __builtin_va_arg(v,l) /* There is no __builtin_ms_va_arg */
+#define ms_va_copy(d,s) __builtin_ms_va_copy(d,s)
+#endif
+
+/* GCC non-x86_64 */
+#if !defined(_MSC_VER) && !defined(__x86_64__)
+typedef __builtin_va_list va_list;
+#define va_start(v,l) __builtin_va_start(v,l)
+#define va_end(v) __builtin_va_end(v)
+#define va_arg(v,l) __builtin_va_arg(v,l)
+#define va_copy(d,s) __builtin_va_copy(d,s)
+typedef __builtin_va_list ms_va_list;
+#define ms_va_start(v,l) __builtin_va_start(v,l)
+#define ms_va_end(v) __builtin_va_end(v)
+#define ms_va_arg(v,l) __builtin_va_arg(v,l)
+#define ms_va_copy(d,s) __builtin_va_copy(d,s)
+#endif
+
+
+
+#endif
+#endif