ACPICA: Clib: Add -nostdinc support for EFI layer

ACPICA commit d261d40ea168f8e4c4e3986de720b8651c4aba1c

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.

-iwithprefix include is required to include <stdarg.h> which contains
compiler specific implementation of vargs when -nostdinc is specified.
-fno-builtin is required for GCC to avoid optimization performed printf().
This optimization cannot be automatically disabled by specifying -nostdlib.
Please refer to the first link below for the details. However, the build
option changes do not affect Linux kernel builds and are not included.
Lv Zheng.

Link: http://www.ciselant.de/projects/gcc_printf/gcc_printf.html
Link: https://github.com/acpica/acpica/commit/d261d40e
Link: https://bugs.acpica.org/show_bug.cgi?id=1302
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>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/acpi/acpica/utdebug.c b/drivers/acpi/acpica/utdebug.c
index 84c08539117d..005a4a2125a5 100644
--- a/drivers/acpi/acpica/utdebug.c
+++ b/drivers/acpi/acpica/utdebug.c
@@ -646,7 +646,7 @@ void ACPI_INTERNAL_VAR_XFACE acpi_log_error(const char *format, ...)
 	va_list args;
 
 	va_start(args, format);
-	(void)acpi_ut_file_vprintf(ACPI_FILE_ERR, format, args);
+	(void)vfprintf(ACPI_FILE_ERR, format, args);
 	va_end(args);
 }