Sync isoworld, some protobuf building changes

plugins/CMakeLists.txt

@@ -66,6 +66,7 @@ ADD_CUSTOM_COMMAND(
             ${PROJECT_PROTOS}
     DEPENDS protoc-bin ${PROJECT_PROTOS}
 )
+add_custom_target(generate_proto DEPENDS ${PROJECT_PROTO_SRCS} ${PROJECT_PROTO_HDRS})
 
 SET_SOURCE_FILES_PROPERTIES( Brushes.h PROPERTIES HEADER_FILE_ONLY TRUE )
 

plugins/Plugins.cmake

@@ -65,14 +65,22 @@ MACRO(DFHACK_PLUGIN)
     )
   CAR(PLUGIN_NAME ${PLUGIN_DEFAULT_ARGS})
   CDR(PLUGIN_SOURCES ${PLUGIN_DEFAULT_ARGS})
-
+
+  SET(PLUGIN_PROTOCPP)
   FOREACH(pbuf ${PLUGIN_PROTOBUFS})
     SET(PLUGIN_SOURCES ${PLUGIN_SOURCES} ${CMAKE_CURRENT_SOURCE_DIR}/proto/${pbuf}.pb.cc)
+    SET(PLUGIN_PROTOCPP ${PLUGIN_PROTOCPP} ${CMAKE_CURRENT_SOURCE_DIR}/proto/${pbuf}.pb.cc)
   ENDFOREACH()
 
+  # Tell CMake the source won't be available until build time.
+  SET_SOURCE_FILES_PROPERTIES(${PLUGIN_PROTOCPP} PROPERTIES GENERATED 1)
+
   ADD_LIBRARY(${PLUGIN_NAME} MODULE ${PLUGIN_SOURCES})
   IDE_FOLDER(${PLUGIN_NAME} "Plugins")
-
+
+  # Make sure the source is generated before the executable builds.
+  ADD_DEPENDENCIES(${PLUGIN_NAME} generate_proto)
+
   LIST(LENGTH PLUGIN_PROTOBUFS NUM_PROTO)
   IF(NUM_PROTO)
     TARGET_LINK_LIBRARIES(${PLUGIN_NAME} dfhack protobuf-lite ${PLUGIN_LINK_LIBRARIES})