- New CMake based build system. Based in part on contribution from

Igor Okulist and Damien Buhl (Patch #14). Added support for running
tests and building with DLL on Windows.
- added missing JSON_API
- Visual Studio DLL: suppressed warning "C4251: <data member>: <type> 
needs to have dll-interface to be used by..." via pragma push/pop
in json-cpp headers.
- New header json/version.h now contains version number macros
(JSONCPP_VERSION_MAJOR, JSONCPP_VERSION_MINOR, JSONCPP_VERSION_PATCH
and JSONCPP_VERSION_HEXA). While this header is generated by CMake,
it is committed to ease build with alternate build system 
(CMake only update the file when it changes avoid issues with VCS).

src/CMakeLists.txt

@@ -0,0 +1,5 @@
+ADD_SUBDIRECTORY(lib_json)
+IF(JSONCPP_WITH_TESTS)
+    ADD_SUBDIRECTORY(jsontestrunner)
+    ADD_SUBDIRECTORY(test_lib_json)
+ENDIF(JSONCPP_WITH_TESTS)

src/jsontestrunner/CMakeLists.txt

@@ -0,0 +1,23 @@
+FIND_PACKAGE(PythonInterp 2.6 REQUIRED)
+
+IF(JSONCPP_LIB_BUILD_SHARED)
+  ADD_DEFINITIONS( -DJSON_DLL )
+ENDIF(JSONCPP_LIB_BUILD_SHARED)
+
+ADD_EXECUTABLE(jsontestrunner_exe
+               main.cpp
+               )
+TARGET_LINK_LIBRARIES(jsontestrunner_exe jsoncpp_lib)
+SET_TARGET_PROPERTIES(jsontestrunner_exe PROPERTIES OUTPUT_NAME jsontestrunner_exe)
+
+IF(PYTHONINTERP_FOUND)
+    # Run end to end parser/writer tests
+    GET_PROPERTY(JSONTESTRUNNER_EXE_PATH TARGET jsontestrunner_exe PROPERTY LOCATION)
+    SET(TEST_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../../test)
+    SET(RUNJSONTESTS_PATH ${TEST_DIR}/runjsontests.py)
+    ADD_CUSTOM_TARGET(jsoncpp_readerwriter_tests ALL
+                      "${PYTHON_EXECUTABLE}" -B "${RUNJSONTESTS_PATH}" "${JSONTESTRUNNER_EXE_PATH}" "${TEST_DIR}/data"
+                      DEPENDS jsontestrunner_exe jsoncpp_test
+                      )
+    ADD_CUSTOM_TARGET(jsoncpp_check DEPENDS jsoncpp_readerwriter_tests)
+ENDIF(PYTHONINTERP_FOUND)

src/lib_json/CMakeLists.txt

@@ -0,0 +1,43 @@
+OPTION(JSONCPP_LIB_BUILD_SHARED "Build jsoncpp_lib as a shared library." OFF)
+IF(JSONCPP_LIB_BUILD_SHARED)
+  SET(JSONCPP_LIB_TYPE SHARED)
+  ADD_DEFINITIONS( -DJSON_DLL_BUILD )
+ELSE(JSONCPP_LIB_BUILD_SHARED)
+  SET(JSONCPP_LIB_TYPE STATIC)
+ENDIF(JSONCPP_LIB_BUILD_SHARED)
+
+
+SET( JSONCPP_INCLUDE_DIR ../../include )
+
+SET( PUBLIC_HEADERS
+    ${JSONCPP_INCLUDE_DIR}/json/config.h
+    ${JSONCPP_INCLUDE_DIR}/json/forwards.h
+    ${JSONCPP_INCLUDE_DIR}/json/features.h
+    ${JSONCPP_INCLUDE_DIR}/json/value.h
+    ${JSONCPP_INCLUDE_DIR}/json/reader.h
+    ${JSONCPP_INCLUDE_DIR}/json/writer.h
+    ${JSONCPP_INCLUDE_DIR}/json/assertions.h
+    ${JSONCPP_INCLUDE_DIR}/json/version.h
+    )
+
+SOURCE_GROUP( "Public API" FILES ${PUBLIC_HEADERS} )
+
+ADD_LIBRARY( jsoncpp_lib ${JSONCPP_LIB_TYPE}
+             ${PUBLIC_HEADERS} 
+             json_tool.h
+             json_reader.cpp
+             json_batchallocator.h
+             json_valueiterator.inl
+             json_value.cpp
+             json_writer.cpp
+             version.h.in
+             )
+SET_TARGET_PROPERTIES( jsoncpp_lib PROPERTIES OUTPUT_NAME jsoncpp )
+SET_TARGET_PROPERTIES( jsoncpp_lib PROPERTIES VERSION ${JSON_CPP_VERSION} SOVERSION ${JSON_CPP_VERSION} )
+
+# Install instructions for this target
+INSTALL( TARGETS jsoncpp_lib
+         RUNTIME DESTINATION bin
+         LIBRARY DESTINATION lib
+         ARCHIVE DESTINATION lib
+)

src/lib_json/version.h.in

@@ -0,0 +1,14 @@
+// DO NOT EDIT. This file is generated by CMake from  "version" 
+// and "version.h.in" files.
+// Run CMake configure step to update it.
+#ifndef JSON_VERSION_H_INCLUDED
+# define JSON_VERSION_H_INCLUDED
+
+# define JSONCPP_VERSION_STRING "@JSONCPP_VERSION@"
+# define JSONCPP_VERSION_MAJOR @JSONCPP_VERSION_MAJOR@
+# define JSONCPP_VERSION_MINOR @JSONCPP_VERSION_MINOR@
+# define JSONCPP_VERSION_PATCH @JSONCPP_VERSION_PATCH@
+# define JSONCPP_VERSION_QUALIFIER @JSONCPP_VERSION_QUALIFIER@
+# define JSONCPP_VERSION_HEXA ((JSONCPP_VERSION_MAJOR << 24) | (JSONCPP_VERSION_MINOR << 16) | (JSONCPP_VERSION_PATCH << 8))
+
+#endif // JSON_VERSION_H_INCLUDED

src/test_lib_json/CMakeLists.txt

@@ -0,0 +1,21 @@
+
+IF(JSONCPP_LIB_BUILD_SHARED)
+  ADD_DEFINITIONS( -DJSON_DLL )
+ENDIF(JSONCPP_LIB_BUILD_SHARED)
+
+ADD_EXECUTABLE( jsoncpp_test 
+                jsontest.cpp
+                main.cpp
+                )
+
+TARGET_LINK_LIBRARIES(jsoncpp_test jsoncpp_lib)
+
+# Run unit tests in post-build
+# (default cmake workflow hides away the test result into a file, resulting in poor dev workflow?!?)
+IF(JSONCPP_WITH_POST_BUILD_UNITTEST)
+    ADD_CUSTOM_COMMAND( TARGET jsoncpp_test
+				        POST_BUILD
+				        COMMAND jsoncpp_test)
+ENDIF(JSONCPP_WITH_POST_BUILD_UNITTEST)
+
+SET_TARGET_PROPERTIES(jsoncpp_test PROPERTIES OUTPUT_NAME jsoncpp_test)