build SGP just once for all languages

another down; a gorillion to go

CMakeLists.txt

@@ -56,6 +56,7 @@ add_subdirectory("ext/export/src")
 # and therefore only need to be compiled once. Good.
 add_subdirectory(Lua)
 add_subdirectory(Multiplayer)
+add_subdirectory(sgp)
 
 # static libraries whose source files, header files or header files included
 # by header files rely on Application and Language preprocessor definitions, and
@@ -65,7 +66,6 @@ TileEngine
 TacticalAI
 Utils
 Strategic
-sgp
 Laptop
 Editor
 Console
@@ -129,10 +129,5 @@ foreach(lang IN LISTS LangTargets)
 			)
 			target_link_libraries(${Executable} PUBLIC ${VeryBadLib})
 		endforeach()
-
-		# for sgp only
-		target_link_libraries(${Executable}_sgp PRIVATE "ddraw.lib" "${PROJECT_SOURCE_DIR}/fmodvc.lib")
-		target_link_libraries(${Executable}_sgp PUBLIC libpng)
-		target_compile_definitions(${Executable}_sgp PRIVATE NO_ZLIB_COMPRESSION)
 	endforeach()
 endforeach()

Ja2/CMakeLists.txt

@@ -50,4 +50,5 @@ Lua
 bfVFS
 "ws2_32.lib"
 Multiplayer
+sgp
 PARENT_SCOPE)

sgp/CMakeLists.txt

@@ -1,4 +1,4 @@
-set(sgpSrc
+add_library(sgp
 "${CMAKE_CURRENT_SOURCE_DIR}/Button Sound Control.cpp"
 "${CMAKE_CURRENT_SOURCE_DIR}/Button System.cpp"
 "${CMAKE_CURRENT_SOURCE_DIR}/Compression.cpp"
@@ -33,4 +33,7 @@ set(sgpSrc
 "${CMAKE_CURRENT_SOURCE_DIR}/vobject_blitters.cpp"
 "${CMAKE_CURRENT_SOURCE_DIR}/vsurface.cpp"
 "${CMAKE_CURRENT_SOURCE_DIR}/WinFont.cpp"
-PARENT_SCOPE)
+)
+target_link_libraries(sgp PRIVATE "ddraw.lib" "${PROJECT_SOURCE_DIR}/fmodvc.lib")
+target_link_libraries(sgp PUBLIC libpng)
+target_compile_definitions(sgp PRIVATE NO_ZLIB_COMPRESSION)