* libc/include/sys/cdefs.h (__CONCAT1): Define.

	(__CONCAT): Define.
	(__STRING): Define.
	(__XSTRING): Define.
	(__ASMNAME): Define.
	* libc/include/string.h (strerror_r): Use __ASMNAME to take target
	specific label prefixes into account.

1 files changed, 21 insertions, 0 deletions

diff --git a/newlib/libc/include/sys/cdefs.h b/newlib/libc/include/sys/cdefs.h
index f0b6a27b4..e3298efaf 100644
--- a/newlib/libc/include/sys/cdefs.h
+++ b/newlib/libc/include/sys/cdefs.h
@@ -58,6 +58,27 @@
 #define __DOTS    	, ...
 #define __THROW
 
+/*
+ * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
+ * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
+ * The __CONCAT macro is a bit tricky to use if it must work in non-ANSI
+ * mode -- there must be no spaces between its arguments, and for nested
+ * __CONCAT's, all the __CONCAT's must be at the left.  __CONCAT can also
+ * concatenate double-quoted strings produced by the __STRING macro, but
+ * this only works with ANSI C.
+ *
+ * __XSTRING is like __STRING, but it expands any macros in its argument
+ * first.  It is only available with ANSI C.
+ */
+#define __CONCAT1(x,y)  x ## y
+#define __CONCAT(x,y)   __CONCAT1(x,y)
+#define __STRING(x)     #x              /* stringify without expanding x */
+#define __XSTRING(x)    __STRING(x)     /* expand x, then stringify */
+
+#ifdef __GNUC__
+# define __ASMNAME(cname)  __XSTRING (__USER_LABEL_PREFIX__) cname
+#endif
+
 #define __ptr_t void *
 #define __long_double_t  long double