Add Xcode target support

It is really messy at the moment. There is no support for copying the
necessary frameworks and dylibs out to the bundle for distribution, and
it is a frankenstein of manual find_library and find_package which can
sometimes pick up Homebrew dylibs.

CMakeLists.txt

@@ -15,6 +15,24 @@ function(prepend_sources SOURCE_FILES)
 	set(${SOURCE_FILES} ${MODIFIED} PARENT_SCOPE)
 endfunction()
 
+# Macro to add OSX framework
+macro(add_framework fwname appname)
+	find_library(FRAMEWORK_${fwname}
+    	NAMES ${fwname}
+    	PATHS ${CMAKE_OSX_SYSROOT}/System/Library
+    		${CMAKE_OSX_SYSROOT}/Library
+    		/System/Library
+    		/Library
+    	PATH_SUFFIXES Frameworks
+    	NO_DEFAULT_PATH)
+    if( ${FRAMEWORK_${fwname}} STREQUAL FRAMEWORK_${fwname}-NOTFOUND)
+        MESSAGE(ERROR ": Framework ${fwname} not found")
+    else()
+        TARGET_LINK_LIBRARIES(${appname} PRIVATE "${FRAMEWORK_${fwname}}/${fwname}")
+        MESSAGE(STATUS "Framework ${fwname} found at ${FRAMEWORK_${fwname}}")
+    endif()
+endmacro()
+
 # 64-bit check
 if(${CMAKE_SIZEOF_VOID_P} EQUAL 8)
 	message(STATUS "Target is 64-bit")
@@ -32,12 +50,21 @@ endif()
 if (UNIX)
 	add_definitions(-DUNIXCOMMON)
 endif()
+
 if(${CMAKE_SYSTEM} MATCHES "Linux")
 	add_definitions(-DLINUX)
 	if(${SRB2_SYSTEM_BITS} EQUAL 64)
 		add_definitions(-DLINUX64)
 	endif()
 endif()
+
+if(${CMAKE_SYSTEM} MATCHES "Darwin")
+	add_definitions(-DMACOSX)
+	if(${CMAKE_C_COMPILER_ID} MATCHES "Clang")
+		set(CLANG ON)
+	endif()
+endif()
+
 # TODO support MacOSX builds
 
 add_subdirectory(src/)

src/CMakeLists.txt

@@ -64,7 +64,7 @@ set(SRB2_CORE_SOURCES
 	screen.c
 	sounds.c
 	st_stuff.c
-	string.c
+	#string.c
 	tables.c
 	v_video.c
 	w_wad.c
@@ -342,6 +342,8 @@ endif()
 
 # Compatibility flag with later versions of GCC
 # We should really fix our code to not need this
-add_compile_options(-mno-ms-bitfields)
+if(NOT CLANG)
+	add_compile_options(-mno-ms-bitfields)
+endif()
 
 add_subdirectory(sdl)

src/sdl/CMakeLists.txt

@@ -40,6 +40,9 @@ set(SRB2_SDL2_EXE_NAME srb2sdl2)
 if(${CMAKE_SYSTEM} MATCHES "Windows")
 	set(SRB2_SDL2_EXE_NAME srb2win)
 endif()
+if(CLANG)
+	set(SRB2_SDL2_EXE_NAME SRB2)
+endif()
 
 # Dependency
 find_package(SDL2)
@@ -76,14 +79,36 @@ if(${SDL2_FOUND})
 		)
 	endif()
 
-	add_executable(${SRB2_SDL2_EXE_NAME} WIN32 ${SRB2_SDL2_TOTAL_SOURCES})
+	if(${CMAKE_SYSTEM} MATCHES Darwin)
+		set(MACOSX_BUNDLE_ICON_FILE Srb2mac.icns)
+		set_source_files_properties(macosx/Srb2mac.icns PROPERTIES MACOSX_PACKAGE_LOCATION "Resources")
+		set(SRB2_SDL2_TOTAL_SOURCES ${SRB2_SDL2_TOTAL_SOURCES}
+			macosx/mac_alert.c
+			macosx/mac_alert.h
+			macosx/Srb2mac.icns
+		)
+	endif()
 
-	target_link_libraries(${SRB2_SDL2_EXE_NAME} PRIVATE
-		${SDL2_LIBRARIES}
-		${PNG_LIBRARIES}
-		${ZLIB_LIBRARIES}
-		${OPENGL_LIBRARIES}
-	)
+	if(CLANG)
+		add_executable(${SRB2_SDL2_EXE_NAME} MACOSX_BUNDLE ${SRB2_SDL2_TOTAL_SOURCES})
+		add_framework(CoreFoundation ${SRB2_SDL2_EXE_NAME})
+		add_framework(SDL2 ${SRB2_SDL2_EXE_NAME})
+		target_link_libraries(${SRB2_SDL2_EXE_NAME} PRIVATE
+			${PNG_LIBRARIES}
+			${ZLIB_LIBRARIES}
+			${OPENGL_LIBRARIES}
+		)
+	else()
+		add_executable(${SRB2_SDL2_EXE_NAME} WIN32 ${SRB2_SDL2_TOTAL_SOURCES})
+
+		target_link_libraries(${SRB2_SDL2_EXE_NAME} PRIVATE
+			${SDL2_LIBRARIES}
+			${PNG_LIBRARIES}
+			${ZLIB_LIBRARIES}
+			${OPENGL_LIBRARIES}
+		)
+
+	endif()
 
 	if(${CMAKE_SYSTEM} MATCHES Windows)
 		target_link_libraries(${SRB2_SDL2_EXE_NAME} PRIVATE