Link protobuf to dfhack core as a shared library.

- Change protobuf libraries to build as DLLs.
- Move some stream features to the lite library.
- Install the lite library and use it from dfhack.

Note that:

- A couple of protobuf headers had to be tweaked.
- The lite library is used because the full one is
  absolutely incompatible with reloading plugins.
- Shutting down protobuf also can't be allowed.

CMakeLists.txt

@@ -80,6 +80,10 @@ ENDIF()
 
 #add depends to include path
 INCLUDE_DIRECTORIES ( library/depends )
+INCLUDE_DIRECTORIES ( library/depends/protobuf/ )
+
+# use shared libraries for protobuf
+ADD_DEFINITIONS(-DPROTOBUF_USE_DLLS)
 
 # build the static lua for dfusion
 INCLUDE_DIRECTORIES ( lua/include )

library/CMakeLists.txt

@@ -196,7 +196,7 @@ endif()
 #effectively disables debug builds...
 SET_TARGET_PROPERTIES(dfhack  PROPERTIES DEBUG_POSTFIX "-debug" )
 
-TARGET_LINK_LIBRARIES(dfhack ${PROJECT_LIBS})
+TARGET_LINK_LIBRARIES(dfhack protobuf-lite ${PROJECT_LIBS})
 
 IF(UNIX)
     # On linux, copy our version of the df launch script which sets LD_PRELOAD

library/depends/protobuf/CMakeLists.txt

@@ -91,6 +91,8 @@ google/protobuf/wire_format_lite.h
 google/protobuf/wire_format_lite_inl.h
 google/protobuf/io/zero_copy_stream.h
 google/protobuf/io/zero_copy_stream_impl_lite.h
+google/protobuf/io/gzip_stream.h
+google/protobuf/io/zero_copy_stream_impl.h
 )
 
 SET(LIBPROTOBUF_FULL_HDRS
@@ -99,7 +101,6 @@ google/protobuf/descriptor.pb.h
 google/protobuf/descriptor_database.h
 google/protobuf/dynamic_message.h
 google/protobuf/generated_message_reflection.h
-google/protobuf/io/gzip_stream.h
 google/protobuf/compiler/importer.h
 google/protobuf/message.h
 google/protobuf/compiler/parser.h
@@ -112,7 +113,6 @@ google/protobuf/text_format.h
 google/protobuf/io/tokenizer.h
 google/protobuf/unknown_field_set.h
 google/protobuf/wire_format.h
-google/protobuf/io/zero_copy_stream_impl.h
 )
 
 LIST(APPEND LIBPROTOBUF_FULL_HDRS ${LIBPROTOBUF_LITE_HDRS})
@@ -128,6 +128,8 @@ google/protobuf/repeated_field.cc
 google/protobuf/wire_format_lite.cc
 google/protobuf/io/zero_copy_stream.cc
 google/protobuf/io/zero_copy_stream_impl_lite.cc
+google/protobuf/io/gzip_stream.cc
+google/protobuf/io/zero_copy_stream_impl.cc
 )
 
 SET(LIBPROTOBUF_FULL_SRCS
@@ -137,7 +139,6 @@ google/protobuf/descriptor_database.cc
 google/protobuf/dynamic_message.cc
 google/protobuf/extension_set_heavy.cc
 google/protobuf/generated_message_reflection.cc
-google/protobuf/io/gzip_stream.cc
 google/protobuf/compiler/importer.cc
 google/protobuf/message.cc
 google/protobuf/compiler/parser.cc
@@ -151,7 +152,6 @@ google/protobuf/text_format.cc
 google/protobuf/io/tokenizer.cc
 google/protobuf/unknown_field_set.cc
 google/protobuf/wire_format.cc
-google/protobuf/io/zero_copy_stream_impl.cc
 )
 
 SET(LIBPROTOC_HDRS
@@ -201,9 +201,36 @@ LIST(APPEND LIBPROTOBUF_FULL_SRCS ${LIBPROTOBUF_LITE_SRCS})
 INCLUDE_DIRECTORIES(${CMAKE_CURRENT_SOURCE_DIR})
 INCLUDE_DIRECTORIES(${dfhack_SOURCE_DIR}/library/depends/zlib)
 
-ADD_LIBRARY(protobuf-lite ${LIBPROTOBUF_LITE_SRCS} ${LIBPROTOBUF_LITE_HDRS})
-ADD_LIBRARY(protobuf ${LIBPROTOBUF_FULL_SRCS} ${LIBPROTOBUF_FULL_HDRS})
-ADD_LIBRARY(protoc ${LIBPROTOC_SRCS} ${LIBPROTOC_HDRS})
+# Protobuf shared libraries
+
+ADD_LIBRARY(protobuf SHARED ${LIBPROTOBUF_FULL_SRCS} ${LIBPROTOBUF_FULL_HDRS})
+ADD_LIBRARY(protobuf-lite SHARED ${LIBPROTOBUF_LITE_SRCS} ${LIBPROTOBUF_LITE_HDRS})
+
+SET_TARGET_PROPERTIES(protobuf PROPERTIES COMPILE_DEFINITIONS LIBPROTOBUF_EXPORTS)
+SET_TARGET_PROPERTIES(protobuf-lite PROPERTIES COMPILE_DEFINITIONS LIBPROTOBUF_EXPORTS)
+
+IF(WIN32)
+    TARGET_LINK_LIBRARIES(protobuf ${CMAKE_THREAD_LIBS_INIT} zlib)
+    TARGET_LINK_LIBRARIES(protobuf-lite ${CMAKE_THREAD_LIBS_INIT} zlib)
+ELSE()
+    TARGET_LINK_LIBRARIES(protobuf ${CMAKE_THREAD_LIBS_INIT} z)
+    TARGET_LINK_LIBRARIES(protobuf-lite ${CMAKE_THREAD_LIBS_INIT} z)
+ENDIF()
+
+install(TARGETS protobuf-lite
+        LIBRARY DESTINATION ${DFHACK_LIBRARY_DESTINATION}/deplibs
+        RUNTIME DESTINATION ${DFHACK_LIBRARY_DESTINATION}/deplibs)
+
+# Protobuf compiler shared library
+
+ADD_LIBRARY(protoc SHARED ${LIBPROTOC_SRCS} ${LIBPROTOC_HDRS})
+
+SET_TARGET_PROPERTIES(protoc PROPERTIES COMPILE_DEFINITIONS LIBPROTOC_EXPORTS)
+TARGET_LINK_LIBRARIES(protoc protobuf)
+
+# Protobuf compiler executable
+
 ADD_EXECUTABLE(protoc-bin google/protobuf/compiler/main.cc google/protobuf/compiler/command_line_interface.h google/protobuf/compiler/cpp/cpp_generator.h)
+
 SET_TARGET_PROPERTIES(protoc-bin PROPERTIES OUTPUT_NAME protoc)
-TARGET_LINK_LIBRARIES(protoc-bin protoc protobuf ${CMAKE_THREAD_LIBS_INIT})
+TARGET_LINK_LIBRARIES(protoc-bin protoc)

library/depends/protobuf/google/protobuf/generated_message_util.h

@@ -72,7 +72,7 @@ double Infinity();
 double NaN();
 
 // Constant used for empty default strings.
-extern const ::std::string kEmptyString;
+extern LIBPROTOBUF_EXPORT const ::std::string kEmptyString;
 
 
 }  // namespace internal

library/depends/protobuf/google/protobuf/stubs/common.h

@@ -96,6 +96,9 @@ namespace protobuf {
   #else
     #define LIBPROTOC_EXPORT   __declspec(dllimport)
   #endif
+#elif defined(PROTOBUF_USE_DLLS)
+  #define LIBPROTOBUF_EXPORT __attribute__ ((visibility("default")))
+  #define LIBPROTOC_EXPORT __attribute__ ((visibility("default")))
 #else
   #define LIBPROTOBUF_EXPORT
   #define LIBPROTOC_EXPORT

plugins/mapexport/CMakeLists.txt

@@ -1,15 +1,5 @@
 PROJECT(mapexport)
 
-INCLUDE_DIRECTORIES (
-    ${CMAKE_CURRENT_SOURCE_DIR}
-    ${dfhack_SOURCE_DIR}/library/depends/protobuf/
-    ${dfhack_SOURCE_DIR}/library/depends/zlib/
-)
-
-LINK_DIRECTORIES(
-    ${dfhack_SOURCE_DIR}/library/depends/zlib/
-)
-
 #The protobuf sources we generate will require these headers
 SET(PROJECT_HDRS
 ${dfhack_SOURCE_DIR}/library/depends/protobuf/google/protobuf/stubs/once.h
@@ -51,7 +41,7 @@ DEPENDS protoc-bin ${PROJECT_PROTOS}
 )
 
 IF(WIN32)
-    DFHACK_PLUGIN(mapexport ${PROJECT_SRCS} ${PROJECT_HDRS} LINK_LIBRARIES protobuf zlib)
+    DFHACK_PLUGIN(mapexport ${PROJECT_SRCS} ${PROJECT_HDRS} LINK_LIBRARIES protobuf-lite)
 ELSE()
-    DFHACK_PLUGIN(mapexport ${PROJECT_SRCS} ${PROJECT_HDRS} LINK_LIBRARIES protobuf z)
+    DFHACK_PLUGIN(mapexport ${PROJECT_SRCS} ${PROJECT_HDRS} LINK_LIBRARIES protobuf-lite)
 ENDIF()

plugins/mapexport/mapexport.cpp

@@ -37,7 +37,6 @@ DFhackCExport command_result plugin_init ( Core * c, std::vector <PluginCommand>
 
 DFhackCExport command_result plugin_shutdown ( Core * c )
 {
-    google::protobuf::ShutdownProtobufLibrary();
     return CR_OK;
 }