Add cmake configuration to select if stubs include symbols

G++ generates structure debug symbols for a few df namespace classes to
generated stub source files. I decided to test how much symbols from
those files would increase binary size. When the result was about double
size I decided to add cmake configuration option to let user easily
select if they prefer complete symbols or reduced size.

CMakeLists.txt

@@ -11,6 +11,7 @@ else(CMAKE_CONFIGURATION_TYPES)
 endif(CMAKE_CONFIGURATION_TYPES)
 
 OPTION(BUILD_DOCS "Choose whether to build the documentation (requires python and Sphinx)." OFF)
+OPTION(REMOVE_SYMBOLS_FROM_DF_STUBS "Remove debug symbols from DF stubs. (Reduces libdfhack size to about half but removes a few useful symbols)" ON)
 
 ## some generic CMake magic
 cmake_minimum_required(VERSION 2.8.12 FATAL_ERROR)

library/CMakeLists.txt

@@ -267,14 +267,15 @@ ADD_CUSTOM_COMMAND(
 )
 
 ADD_CUSTOM_TARGET(generate_headers DEPENDS ${dfapi_SOURCE_DIR}/include/df/codegen.out.xml)
-
-IF(UNIX)
+IF(REMOVE_SYMBOLS_FROM_DF_STUBS)
+  IF(UNIX)
     # Don't produce debug info for generated stubs
     SET_SOURCE_FILES_PROPERTIES(DataStatics.cpp DataStaticsCtor.cpp DataStaticsFields.cpp ${STATIC_FIELDS_FILES}
                                 PROPERTIES COMPILE_FLAGS "-g0 -O1")
-ELSE(WIN32)
+  ELSE(WIN32)
     SET_SOURCE_FILES_PROPERTIES(DataStatics.cpp DataStaticsCtor.cpp DataStaticsFields.cpp ${STATIC_FIELDS_FILES}
                                 PROPERTIES COMPILE_FLAGS "/O1 /bigobj")
+  ENDIF()
 ENDIF()
 
 # Compilation