* libc/include/sys/features.h: Define __STDC_ISO_10646__ for Cygwin.

* libc/include/wchar.h: Include features.h.

newlib/ChangeLog

@@ -1,3 +1,8 @@
+2011-01-27  Corinna Vinschen  <vinschen@redhat.com>
+
+	* libc/include/sys/features.h: Define __STDC_ISO_10646__ for Cygwin.
+	* libc/include/wchar.h: Include features.h.
+
 2011-01-15  Yaakov Selkowitz  <yselkowitz@users.sourceforge.net>
 
 	* libc/include/sys/types.h (ulong): Add typedef.

newlib/libc/include/sys/features.h

@@ -178,6 +178,12 @@ extern "C" {
 /* #define _XOPEN_UNIX				    -1 */
 
 #endif /* !__STRICT_ANSI__ || __cplusplus || __STDC_VERSION__ >= 199901L */
+
+/* The value corresponds to UNICODE version 4.0, which is the version
+   supported by XP.  Newlib supports 5.2 (2011) but so far Cygwin needs
+   the MS conversions for double-byte charsets. */
+#define __STDC_ISO_10646__ 200305L
+
 #endif /* __CYGWIN__ */
 
 /* Per the permission given in POSIX.1-2008 section 2.2.1, define

newlib/libc/include/wchar.h

@@ -16,6 +16,9 @@
 /* For _mbstate_t definition. */
 #include <sys/_types.h>
 
+/* For __STDC_ISO_10646__ */
+#include <sys/features.h>
+
 #ifndef NULL
 #define NULL	0
 #endif