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commit d38d37bdfe24b7ce1bdcb55642fb6b904718e68f
Author: Howard Chu <hyc@symas.com>
Date:   Tue Apr 25 19:02:18 2017 -0700

    Fix ctype for newer NDK headers

---
 libstdc++-v3/config/os/bionic/ctype_base.h |   34 +++++++++++++++++++----------
 1 file changed, 23 insertions(+), 11 deletions(-)

--- a/libstdc++-v3/config/os/bionic/ctype_base.h
+++ b/libstdc++-v3/config/os/bionic/ctype_base.h
@@ -28,6 +28,18 @@
 
 // Information as gleaned from /usr/include/ctype.h
 
+// _CTYPE prefix was added in NDK r14 unified headers
+#ifndef _CTYPE_U
+#define _CTYPE_U _U
+#define _CTYPE_L _L
+#define _CTYPE_D _N
+#define _CTYPE_S _S
+#define _CTYPE_P _P
+#define _CTYPE_C _C
+#define _CTYPE_X _X
+#define _CTYPE_B _B
+#endif
+
 namespace std _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
@@ -41,17 +53,17 @@
     // NB: Offsets into ctype<char>::_M_table force a particular size
     // on the mask type. Because of this, we don't use an enum.
     typedef char 		mask;
-    static const mask upper    	= _U;
-    static const mask lower 	= _L;
-    static const mask alpha 	= _U | _L;
-    static const mask digit 	= _N;
-    static const mask xdigit 	= _X | _N;
-    static const mask space 	= _S;
-    static const mask print 	= _P | _U | _L | _N | _B;
-    static const mask graph 	= _P | _U | _L | _N;
-    static const mask cntrl 	= _C;
-    static const mask punct 	= _P;
-    static const mask alnum 	= _U | _L | _N;
+    static const mask upper    	= _CTYPE_U;
+    static const mask lower 	= _CTYPE_L;
+    static const mask alpha 	= _CTYPE_U | _CTYPE_L;
+    static const mask digit 	= _CTYPE_D;
+    static const mask xdigit 	= _CTYPE_X | _CTYPE_D;
+    static const mask space 	= _CTYPE_S;
+    static const mask print 	= _CTYPE_P | _CTYPE_U | _CTYPE_L | _CTYPE_D | _CTYPE_B;
+    static const mask graph 	= _CTYPE_P | _CTYPE_U | _CTYPE_L | _CTYPE_D;
+    static const mask cntrl 	= _CTYPE_C;
+    static const mask punct 	= _CTYPE_P;
+    static const mask alnum 	= _CTYPE_U | _CTYPE_L | _CTYPE_D;
 #if __cplusplus >= 201103L
     static const mask blank 	= space;
 #endif