Add JSON_DLL_BUILD only for shared lib

Author: jschueller

src/lib_json/CMakeLists.txt

@@ -68,11 +68,11 @@ ELSE(JSONCPP_WITH_CMAKE_PACKAGE)
 ENDIF()
 
 IF(BUILD_SHARED_LIBS)
-    ADD_DEFINITIONS( -DJSON_DLL_BUILD )
     ADD_LIBRARY(jsoncpp_lib SHARED ${PUBLIC_HEADERS} ${jsoncpp_sources})
     SET_TARGET_PROPERTIES( jsoncpp_lib PROPERTIES VERSION ${JSONCPP_VERSION} SOVERSION ${JSONCPP_SOVERSION})
     SET_TARGET_PROPERTIES( jsoncpp_lib PROPERTIES OUTPUT_NAME jsoncpp
                            DEBUG_OUTPUT_NAME jsoncpp${DEBUG_LIBNAME_SUFFIX} )
+    SET_TARGET_PROPERTIES( jsoncpp_lib PROPERTIES COMPILE_DEFINITIONS JSON_DLL_BUILD)
 
     # Set library's runtime search path on OSX
     IF(APPLE)