Clib: Add -nostdinc support for EFI layer

This patch adds sprintf()/snprintf()/vsnprintf()/printf()/vfprintf()
support for OSPMs that have ACPI_USE_SYSTEM_CLIBRARY defined but do not
have ACPI_USE_STANDARD_HEADERS defined.

This patch also converts the entire EFI porting layer to use the standard
system Clibrary and implements GNU EFI specific standard Clibrary stdio
operations.

-fno-builtin is required for GCC to avoid optimization performed printf().
This optimization cannot be automatically disabled by specifying -nostdlib.
Please refer to the Link 1 for the details.
-iwithprefix include is required to include <stdarg.h> which contains
compiler specific implementation of vargs. It is unclear why there is the
vargs macros defined for OSPMs that do not have ACPI_USE_SYSTEM_CLIBRARY
defined. After applying this patch, this special vargs implementation
should also get deleted.

Standard C header files shouldn't be included here and there throughout the
entire ACPICA code base. This patch corrects some of them. Lv Zheng.

Link 1: http://www.ciselant.de/projects/gcc_printf/gcc_printf.html
Signed-off-by: Lv Zheng <lv.zheng@intel.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/source/include/platform/acgcc.h b/source/include/platform/acgcc.h
index 3d36a38a3..773bd8959 100644
--- a/source/include/platform/acgcc.h
+++ b/source/include/platform/acgcc.h
@@ -116,6 +116,10 @@
 #ifndef __ACGCC_H__
 #define __ACGCC_H__
 
+/* Allow inclusion of stdarg.h */
+
+#define ACPI_USE_COMPILER_VA
+
 #define ACPI_INLINE             __inline__
 
 /* Function name is used for debug output. Non-ANSI, compiler-dependent */