C++: Recognize C++11 constexpr

Change-Id: Iac8ba58404284f0d90fd5a3640eb9ccd7e98058d
Reviewed-by: Roberto Raggi <roberto.raggi@nokia.com>

src/libs/3rdparty/cplusplus/Keywords.cpp

@@ -945,7 +945,7 @@ static inline int classify8(const char *s, bool q, bool x) {
   return T_IDENTIFIER;
 }
 
-static inline int classify9(const char *s, bool q, bool) {
+static inline int classify9(const char *s, bool q, bool x) {
   if (s[0] == '_') {
     if (s[1] == '_') {
       if (s[2] == 'c') {
@@ -965,6 +965,25 @@ static inline int classify9(const char *s, bool q, bool) {
       }
     }
   }
+  else if (x && s[0] == 'c') {
+    if (s[1] == 'o') {
+      if (s[2] == 'n') {
+        if (s[3] == 's') {
+          if (s[4] == 't') {
+            if (s[5] == 'e') {
+              if (s[6] == 'x') {
+                if (s[7] == 'p') {
+                  if (s[8] == 'r') {
+                    return T_CONSTEXPR;
+                  }
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+  }
   else if (s[0] == 'n') {
     if (s[1] == 'a') {
       if (s[2] == 'm') {

src/libs/3rdparty/cplusplus/Parser.cpp

@@ -3413,6 +3413,10 @@ bool Parser::lookAtStorageClassSpecifier() const
     case T_MUTABLE:
     case T_TYPEDEF:
         return true;
+    case T_CONSTEXPR:
+        if (_cxx0xEnabled)
+            return true;
+        // fall-through
     default:
         return false;
     }

src/libs/3rdparty/cplusplus/Token.h

@@ -111,6 +111,7 @@ enum Kind {
     T_CLASS,
     T_CONST,
     T_CONST_CAST,
+    T_CONSTEXPR,
     T_CONTINUE,
     T_DEFAULT,
     T_DELETE,