Make one-bit bit fields unsigned.

third_party/jsoncpp/patches/value.h.diff

Index: third_party/jsoncpp/patches/value.h.diff
diff --git a/third_party/jsoncpp/patches/value.h.diff b/third_party/jsoncpp/patches/value.h.diff
new file mode 100644
index 0000000000000000000000000000000000000000..bce57b2da7418853e6cde1ccc043d7e0baa39af7
--- /dev/null
+++ b/third_party/jsoncpp/patches/value.h.diff
@@ -0,0 +1,37 @@
+diff --git "a/source\\include\\json\\value.h" "b/overrides\\include\\json\\value.h"
+index b013c9b..5707260 100644
+--- "a/source\\include\\json\\value.h"
++++ "b/overrides\\include\\json\\value.h"
+@@ -7,7 +7,7 @@
+ # define CPPTL_JSON_H_INCLUDED
+ 
+ #if !defined(JSON_IS_AMALGAMATION)
+-# include "forwards.h"
++# include "third_party/jsoncpp/source/include/json/forwards.h"
+ #endif // if !defined(JSON_IS_AMALGAMATION)
+ # include <string>
+ # include <vector>
+@@ -136,7 +136,7 @@ namespace Json {
+       typedef Json::LargestUInt LargestUInt;
+       typedef Json::ArrayIndex ArrayIndex;
+ 
+-      static const Value null;
++      static const Value& null;
+       /// Minimum signed integer value that can be stored in a Json::Value.
+       static const LargestInt minLargestInt;
+       /// Maximum signed integer value that can be stored in a Json::Value.
+@@ -496,10 +496,12 @@ namespace Json {
+ # 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 int allocated_ : 1;
+ # ifdef JSON_VALUE_USE_INTERNAL_MAP
+       unsigned int itemIsUsed_ : 1;      // used by the ValueInternalMap container.
+-      int memberNameIsStatic_ : 1;       // used by the ValueInternalMap container.
++      unsigned int memberNameIsStatic_ : 1; // used by the ValueInternalMap container.
+ # endif
+       CommentInfo *comments_;
+    };