cmake: build hardened dll game with sub cmake to use different compilation flags

Author: illwieckz

cmake/DaemonFlags.cmake

@@ -337,9 +337,15 @@ else()
 		try_c_cxx_flag(WSTACK_PROTECTOR "-Wstack-protector")
 
 		if (NOT NACL OR (NACL AND GAME_PIE))
-			try_c_cxx_flag(FPIE "-fPIE")
-			if (NOT APPLE)
-				try_linker_flag(LINKER_PIE "-pie")
+			if (FORK EQUAL 2 AND BUILD_GAME_NATIVE_DLL)
+				try_c_cxx_flag(FPIC "-fPIC")
+				try_linker_flag(LINKER_PIC "-pic")
+			else()
+				try_c_cxx_flag(FPIE "-fPIE")
+
+				if (NOT APPLE)
+					try_linker_flag(LINKER_PIE "-pie")
+				endif()
 			endif()
 		endif()
 

cmake/DaemonGame.cmake

@@ -98,7 +98,11 @@ function(GAMEMODULE)
 		endif()
 
 		if (BUILD_GAME_NATIVE_DLL)
-			buildGameModule("native-dll")
+			if (USE_HARDENING)
+				set(FORK 1 PARENT_SCOPE)
+			else()
+				buildGameModule("native-dll")
+			endif()
 		endif()
 
 		if (BUILD_GAME_NATIVE_EXE)
@@ -121,6 +125,17 @@ function(GAMEMODULE)
 				"-D${inherited_option}=${${inherited_option}}")
 		endforeach(inherited_option)
 
+		if (BUILD_GAME_NATIVE_DLL AND USE_HARDENING)
+			set(VMS_PROJECT dll-vms)
+			set(VMS_PROJECTS ${VMS_PROJECT})
+
+			gameSubProject(
+				-DBUILD_GAME_NACL=OFF
+				-DBUILD_GAME_NATIVE_DLL=ON
+				-DBUILD_GAME_NATIVE_EXE=OFF
+			)
+		endif()
+
 		if (BUILD_GAME_NACL)
 			if (USE_NACL_SAIGO)
 				add_custom_target(nacl-vms ALL)
@@ -170,7 +185,12 @@ function(GAMEMODULE)
 
 		set(VMS_PROJECTS ${VMS_PROJECTS} PARENT_SCOPE)
 	elseif (FORK EQUAL 2)
-		if (BUILD_GAME_NACL)
+		if (BUILD_GAME_NATIVE_DLL)
+			# Put the .dll and .so files in the same directory as the engine.
+			set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/..)
+
+			buildGameModule("native-dll")
+		elseif (BUILD_GAME_NACL)
 			if (USE_NACL_SAIGO)
 				set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})
 			else()