ndk: <sys/cdefs.h> minor update

This patch fixes some formatting issues in <sys/cdefs.h>:

- change '#if __STDC_VERSION__ > xxx' into '#if defined(__STDC_VERSION__) && __STDC_VERSION > xxx'
- add __LIBC_HIDDEN__ definition (not technically required, but makes comparing the headers with upstream easier)

ndk/platforms/android-3/include/sys/cdefs.h

@@ -85,7 +85,7 @@
 #define	___STRING(x)	__STRING(x)
 #define	___CONCAT(x,y)	__CONCAT(x,y)
 
-#if __STDC__ || defined(__cplusplus)
+#if defined(__STDC__) || defined(__cplusplus)
 #define	__P(protos)	protos		/* full-blown ANSI C */
 #define	__CONCAT(x,y)	x ## y
 #define	__STRING(x)	#x
@@ -219,7 +219,7 @@
  * C99 defines the restrict type qualifier keyword, which was made available
  * in GCC 2.92.
  */
-#if __STDC_VERSION__ >= 199901L
+#if defined(__STDC__VERSION__) && __STDC_VERSION__ >= 199901L
 #define	__restrict	restrict
 #else
 #if !__GNUC_PREREQ__(2, 92)
@@ -231,7 +231,7 @@
  * C99 defines __func__ predefined identifier, which was made available
  * in GCC 2.95.
  */
-#if !(__STDC_VERSION__ >= 199901L)
+#if !defined(__STDC_VERSION__) || !(__STDC_VERSION__ >= 199901L)
 #if __GNUC_PREREQ__(2, 6)
 #define	__func__	__PRETTY_FUNCTION__
 #elif __GNUC_PREREQ__(2, 4)
@@ -503,5 +503,6 @@
 #endif
 
 #define  __BIONIC__   1
+#include <android/api-level.h>
 
 #endif /* !_SYS_CDEFS_H_ */

ndk/platforms/android-3/include/sys/cdefs_elf.h

@@ -95,6 +95,10 @@
 	__asm__(".section _sec\n\t.asciz _str\n\t.previous")
 #endif
 
+/* GCC visibility helper macro */
+#define __LIBC_HIDDEN__							\
+	__attribute__ ((visibility ("hidden")))
+
 #define	__IDSTRING(_n,_s)		__SECTIONSTRING(.ident,_s)
 
 #define	__RCSID(_s)			__IDSTRING(rcsid,_s)