* libc/include/sys/_types.h (_ssize_t): Define as signed equivalent of

	size_t with GCC.

newlib/ChangeLog

@@ -1,3 +1,9 @@
+2013-02-20  Yaakov Selkowitz  <yselkowitz@users.sourceforge.net>
+	    Joseph S. Myers <joseph@codesourcery.com>
+
+	* libc/include/sys/_types.h (_ssize_t): Define as signed equivalent of
+	size_t with GCC.
+
 2013-02-19  Steve Ellcey  <sellcey@mips.com>
 
 	* libc/machine/mips/memcpy.S: Fix USE_PREFETCH check.

newlib/libc/include/sys/_types.h

@@ -52,12 +52,21 @@ typedef _off64_t _fpos64_t;
 #endif
 
 #ifndef __ssize_t_defined
+#ifdef __SIZE_TYPE__
+/* If __SIZE_TYPE__ is defined (gcc) we define ssize_t based on size_t.
+   We simply change "unsigned" to "signed" for this single definition
+   to make sure ssize_t and size_t only differ by their signedness. */
+#define unsigned signed
+typedef __SIZE_TYPE__ _ssize_t;
+#undef unsigned
+#else
 #if defined(__INT_MAX__) && __INT_MAX__ == 2147483647
 typedef int _ssize_t;
 #else
 typedef long _ssize_t;
 #endif
 #endif
+#endif
 
 #define __need_wint_t
 #include <stddef.h>