Make JSON chunk functionality conditional for VC6 builds

Author: bobtista

Core/GameEngine/CMakeLists.txt

@@ -57,8 +57,8 @@ set(GAMEENGINE_SRC
 #    Include/Common/GameType.h
     Include/Common/GameUtility.h
 #    Include/Common/Geometry.h
-    Include/Common/JSONChunkInput.h
-    Include/Common/JSONChunkOutput.h
+    $<$<NOT:$<BOOL:${IS_VS6_BUILD}>>:Include/Common/JSONChunkInput.h>
+    $<$<NOT:$<BOOL:${IS_VS6_BUILD}>>:Include/Common/JSONChunkOutput.h>
 #    Include/Common/GlobalData.h
 #    Include/Common/Handicap.h
 #    Include/Common/IgnorePreferences.h
@@ -648,8 +648,8 @@ set(GAMEENGINE_SRC
 #    Source/Common/System/CriticalSection.cpp
 #    Source/Common/System/DataChunk.cpp
     Source/Common/System/Debug.cpp
-    Source/Common/System/JSONChunkInput.cpp
-    Source/Common/System/JSONChunkOutput.cpp
+    $<$<NOT:$<BOOL:${IS_VS6_BUILD}>>:Source/Common/System/JSONChunkInput.cpp>
+    $<$<NOT:$<BOOL:${IS_VS6_BUILD}>>:Source/Common/System/JSONChunkOutput.cpp>
 #    Source/Common/System/Directory.cpp
 #    Source/Common/System/DisabledTypes.cpp
 #    Source/Common/System/encrypt.cpp
@@ -1168,14 +1168,19 @@ else()
 endif()
 
 
-find_package(nlohmann_json CONFIG)
-if (TARGET nlohmann_json::nlohmann_json)
-    # Uses nlohmann-json from vcpkg
-    set(NLOHMANN_JSON_TARGET nlohmann_json::nlohmann_json)
+if (NOT IS_VS6_BUILD)
+    find_package(nlohmann_json CONFIG)
+    if (TARGET nlohmann_json::nlohmann_json)
+        # Uses nlohmann-json from vcpkg
+        set(NLOHMANN_JSON_TARGET nlohmann_json::nlohmann_json)
+    else()
+        # Uses nlohmann-json from github repository
+        include(${CMAKE_SOURCE_DIR}/cmake/nlohmann-json.cmake)
+        set(NLOHMANN_JSON_TARGET nlohmann_json)
+    endif()
 else()
-    # Uses nlohmann-json from github repository
-    include(${CMAKE_SOURCE_DIR}/cmake/nlohmann-json.cmake)
-    set(NLOHMANN_JSON_TARGET nlohmann_json)
+    # VC6 doesn't support C++11, so nlohmann-json is not available
+    set(NLOHMANN_JSON_TARGET "")
 endif()
 
 add_library(corei_gameengine_private INTERFACE)
@@ -1212,5 +1217,5 @@ target_link_libraries(corei_gameengine_public INTERFACE
     d3d8lib
     gamespy::gamespy
     stlport
-    ${NLOHMANN_JSON_TARGET}
+    $<$<NOT:$<BOOL:${IS_VS6_BUILD}>>:${NLOHMANN_JSON_TARGET}>
 )