ACPICA: Clib: Cleanup va_arg related code

ACPICA commit 32701b33cdc48d9bc43da8c9274cf172135b68fc

We in fact always use the compiler specific stdarg.h for GCC even
when ACPI_USE_STANDARD_HEADERS is not defined. So that the va_arg usages
can always be correct for different compiler options.

Likewise, the va_arg implemented in acenv.h is actually MSVC specific,
this patch also moves it to acmsvc.h and tunes acwin.h to correctly use
it.

After cleaning up, this patch removes all <stdarg.h> inclusions from
other files, but doesn't touch the BSD headers. Lv Zheng.

Link: https://github.com/acpica/acpica/commit/32701b33
Link: https://bugs.acpica.org/show_bug.cgi?id=1298
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

include/acpi/platform/acenv.h

@@ -342,52 +342,12 @@
 
 /* Use the standard headers from the standard locations */
 
-#include <stdarg.h>
 #include <stdlib.h>
 #include <string.h>
 #include <ctype.h>
 
 #endif				/* ACPI_USE_STANDARD_HEADERS */
 
-/* We will be linking to the standard Clib functions */
-
-#else
-
-/******************************************************************************
- *
- * Not using native C library, use local implementations
- *
- *****************************************************************************/
-
-/*
- * Use local definitions of C library macros and functions. These function
- * implementations may not be as efficient as an inline or assembly code
- * implementation provided by a native C library, but they are functionally
- * equivalent.
- */
-#ifndef va_arg
-
-#ifndef _VALIST
-#define _VALIST
-typedef char *va_list;
-#endif				/* _VALIST */
-
-/* Storage alignment properties */
-
-#define  _AUPBND                (sizeof (acpi_native_int) - 1)
-#define  _ADNBND                (sizeof (acpi_native_int) - 1)
-
-/* Variable argument list macro definitions */
-
-#define _bnd(X, bnd)            (((sizeof (X)) + (bnd)) & (~(bnd)))
-#define va_arg(ap, T)           (*(T *)(((ap) += (_bnd (T, _AUPBND))) - (_bnd (T,_ADNBND))))
-#define va_end(ap)              (ap = (va_list) NULL)
-#define va_start(ap, A)         (void) ((ap) = (((char *) &(A)) + (_bnd (A,_AUPBND))))
-
-#endif				/* va_arg */
-
-/* Use the local (ACPICA) definitions of the clib functions */
-
 #endif				/* ACPI_USE_SYSTEM_CLIBRARY */
 
 #ifndef ACPI_FILE

include/acpi/platform/acgcc.h

@@ -44,6 +44,12 @@
 #ifndef __ACGCC_H__
 #define __ACGCC_H__
 
+/*
+ * Use compiler specific <stdarg.h> is a good practice for even when
+ * -nostdinc is specified (i.e., ACPI_USE_STANDARD_HEADERS undefined.
+ */
+#include <stdarg.h>
+
 #define ACPI_INLINE             __inline__
 
 /* Function name is used for debug output. Non-ANSI, compiler-dependent */

include/acpi/platform/aclinux.h

@@ -180,7 +180,6 @@
 
 #else				/* !__KERNEL__ */
 
-#include <stdarg.h>
 #include <string.h>
 #include <stdlib.h>
 #include <ctype.h>