From 7a4d498b42cd3ab708f65fdb7fe258a9282f1aeb Mon Sep 17 00:00:00 2001
From: Gregory Nutt <gnutt@nuttx.org>
Date: Fri, 17 Feb 2017 09:48:55 -0600
Subject: [PATCH] wctype.h needs extern C

---
 include/cxx/cwctype |  2 ++
 include/wctype.h    | 13 +++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/include/cxx/cwctype b/include/cxx/cwctype
index 5a8f35c0fb..7c0424c539 100644
--- a/include/cxx/cwctype
+++ b/include/cxx/cwctype
@@ -48,7 +48,9 @@
 
 namespace std
 {
+  using ::wint_t;
   using ::wctrans_t;
+  using ::wctype_t;
 
   using ::iswalnum;
   using ::iswalpha;
diff --git a/include/wctype.h b/include/wctype.h
index fac596eae1..39f338940e 100644
--- a/include/wctype.h
+++ b/include/wctype.h
@@ -81,6 +81,14 @@ typedef int wctrans_t;
  * Public Function Prototypes
  ****************************************************************************/
 
+#ifdef __cplusplus
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
 /* "The <wchar.h> header declares the following as functions and may also
  *  define them as macros. Function prototypes must be provided for use with
  *  an ISO C compiler."
@@ -108,4 +116,9 @@ wctrans_t         wctrans(FAR const char *);
 int               iswctype(wint_t, wctype_t);
 wctype_t          wctype(FAR const char *);
 
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* INCLUDE_WTYPE_H */