Make one-bit bit fields unsigned.

third_party/jsoncpp/overrides/include/json/value.h

 // Copyright 2007-2010 Baptiste Lepilleur
 // Distributed under MIT license, or public domain if desired and
 // recognized in your jurisdiction.
 // See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE
 
 #ifndef CPPTL_JSON_H_INCLUDED
 # define CPPTL_JSON_H_INCLUDED
 
 #if !defined(JSON_IS_AMALGAMATION)
 # include "third_party/jsoncpp/source/include/json/forwards.h"
@@ skipping 478 matching lines @@
          bool bool_;
          char *string_;
 # ifdef JSON_VALUE_USE_INTERNAL_MAP
          ValueInternalArray *array_;
          ValueInternalMap *map_;
 #else
          ObjectValues *map_;
 # endif
       } value_;
       ValueType type_ : 8;
-      int allocated_ : 1;     // Notes: if declared as bool, bitfield is useless.
+      // One-bit bitfields must be unsigned to allow storing 1.
+      // They must be 32-bits to share storage with ValueHolder.
+      unsigned allocated_ : 1;

[scottmg, 2015/04/13 22:45:51]

can you make these `unsigned int` to match the other one?

 # ifdef JSON_VALUE_USE_INTERNAL_MAP
       unsigned int itemIsUsed_ : 1;      // used by the ValueInternalMap container.
-      int memberNameIsStatic_ : 1;       // used by the ValueInternalMap container.
+      unsigned memberNameIsStatic_ : 1;       // used by the ValueInternalMap container.
 # endif
       CommentInfo *comments_;
    };
 
 
    /** \brief Experimental and untested: represents an element of the "path" to access a node.
     */
    class PathArgument
    {
    public:
@@ skipping 587 matching lines @@
       {
          return deref();
       }
    };
 
 
 } // namespace Json
 
 
 #endif // CPPTL_JSON_H_INCLUDED