cmake: use genexes for linking against apple frameworks

CMakeLists.txt

@@ -22,7 +22,8 @@ endif()
 set(EXTRA_LIBS)
 set(EXTRA_LDFLAGS)
 
-set(CMAKE_DEPENDS)
+set(CMAKE_LIBS)
+set(PKGCONFIG_LDFLAGS)
 set(PKGCONFIG_DEPENDS)
 
 # This is a virtual "library" that just exists to collect up compiler and
@@ -2284,73 +2285,96 @@ elseif(APPLE)
     endif()
   endif()
 
+  # Minimum version for $<LINK_LIBRARY:feature,library-list>
+  cmake_minimum_required(VERSION 3.24)
+
   # Actually load the frameworks at the end so we don't duplicate include.
   if(SDL_FRAMEWORK_COREVIDEO)
-    list(APPEND EXTRA_LDFLAGS "-Wl,-framework,CoreVideo")
+    list(APPEND PKGCONFIG_LDFLAGS "-Wl,-framework,CoreVideo")
+    list(APPEND CMAKE_LIBS "$<LINK_LIBRARY:FRAMEWORK,CoreVideo>")
   endif()
   if(SDL_FRAMEWORK_COCOA)
-    list(APPEND EXTRA_LDFLAGS "-Wl,-framework,Cocoa")
+    list(APPEND PKGCONFIG_LDFLAGS "-Wl,-framework,Cocoa")
+    list(APPEND CMAKE_LIBS "$<LINK_LIBRARY:FRAMEWORK,Cocoa>")
   endif()
   if(SDL_FRAMEWORK_IOKIT)
-    list(APPEND EXTRA_LDFLAGS "-Wl,-framework,IOKit")
+    list(APPEND PKGCONFIG_LDFLAGS "-Wl,-framework,IOKit")
+    list(APPEND CMAKE_LIBS "$<LINK_LIBRARY:FRAMEWORK,IOKit>")
   endif()
   if(SDL_FRAMEWORK_FF)
-    list(APPEND EXTRA_LDFLAGS "-Wl,-framework,ForceFeedback")
+    list(APPEND PKGCONFIG_LDFLAGS "-Wl,-framework,ForceFeedback")
+    list(APPEND CMAKE_LIBS "$<LINK_LIBRARY:FRAMEWORK,ForceFeedback>")
   endif()
   if(SDL_FRAMEWORK_CARBON)
-    list(APPEND EXTRA_LDFLAGS "-Wl,-framework,Carbon")
+    list(APPEND PKGCONFIG_LDFLAGS "-Wl,-framework,Carbon")
+    list(APPEND CMAKE_LIBS "$<LINK_LIBRARY:FRAMEWORK,Carbon>")
   endif()
   if(SDL_FRAMEWORK_COREAUDIO)
-    list(APPEND EXTRA_LDFLAGS "-Wl,-framework,CoreAudio")
+    list(APPEND PKGCONFIG_LDFLAGS "-Wl,-framework,CoreAudio")
+    list(APPEND CMAKE_LIBS "$<LINK_LIBRARY:FRAMEWORK,CoreAudio>")
   endif()
   if(SDL_FRAMEWORK_AUDIOTOOLBOX)
-    list(APPEND EXTRA_LDFLAGS "-Wl,-framework,AudioToolbox")
+    list(APPEND PKGCONFIG_LDFLAGS "-Wl,-framework,AudioToolbox")
+    list(APPEND CMAKE_LIBS "$<LINK_LIBRARY:FRAMEWORK,AudioToolbox>")
   endif()
   if(SDL_FRAMEWORK_AVFOUNDATION)
-    list(APPEND EXTRA_LDFLAGS "-Wl,-framework,AVFoundation")
+    list(APPEND PKGCONFIG_LDFLAGS "-Wl,-framework,AVFoundation")
+    list(APPEND CMAKE_LIBS "$<LINK_LIBRARY:FRAMEWORK,AVFoundation>")
   endif()
   if(SDL_FRAMEWORK_COREBLUETOOTH)
-    list(APPEND EXTRA_LDFLAGS "-Wl,-framework,CoreBluetooth")
+    list(APPEND PKGCONFIG_LDFLAGS "-Wl,-framework,CoreBluetooth")
+    list(APPEND CMAKE_LIBS "$<LINK_LIBRARY:FRAMEWORK,CoreBluetooth>")
   endif()
   if(SDL_FRAMEWORK_COREGRAPHICS)
-    list(APPEND EXTRA_LDFLAGS "-Wl,-framework,CoreGraphics")
+    list(APPEND PKGCONFIG_LDFLAGS "-Wl,-framework,CoreGraphics")
+    list(APPEND CMAKE_LIBS "$<LINK_LIBRARY:FRAMEWORK,CoreGraphics>")
   endif()
   if(SDL_FRAMEWORK_COREMOTION)
-    list(APPEND EXTRA_LDFLAGS "-Wl,-framework,CoreMotion")
+    list(APPEND PKGCONFIG_LDFLAGS "-Wl,-framework,CoreMotion")
+    list(APPEND CMAKE_LIBS "$<LINK_LIBRARY:FRAMEWORK,Coremotion>")
   endif()
   if(SDL_FRAMEWORK_FOUNDATION)
-    list(APPEND EXTRA_LDFLAGS "-Wl,-framework,Foundation")
+    list(APPEND PKGCONFIG_LDFLAGS "-Wl,-framework,Foundation")
+    list(APPEND CMAKE_LIBS "$<LINK_LIBRARY:FRAMEWORK,Foundation>")
   endif()
   if(SDL_FRAMEWORK_GAMECONTROLLER)
     find_library(GAMECONTROLLER GameController)
     if(GAMECONTROLLER)
-      list(APPEND EXTRA_LDFLAGS "-Wl,-weak_framework,GameController")
+      list(APPEND PKGCONFIG_LDFLAGS "-Wl,-weak_framework,GameController")
+      list(APPEND CMAKE_LIBS "$<LINK_LIBRARY:WEAK_FRAMEWORK,GameController>")
     endif()
   endif()
   if(SDL_FRAMEWORK_METAL)
     if(IOS OR TVOS)
-      list(APPEND EXTRA_LDFLAGS "-Wl,-framework,Metal")
+      list(APPEND PKGCONFIG_LDFLAGS "-Wl,-framework,Metal")
+      list(APPEND CMAKE_LIBS "$<LINK_LIBRARY:FRAMEWORK,Metal>")
     else()
-      list(APPEND EXTRA_LDFLAGS "-Wl,-weak_framework,Metal")
+      list(APPEND PKGCONFIG_LDFLAGS "-Wl,-weak_framework,Metal")
+      list(APPEND CMAKE_LIBS "$<LINK_LIBRARY:WEAK_FRAMEWORK,Metal>")
     endif()
   endif()
   if(SDL_FRAMEWORK_OPENGLES)
-    list(APPEND EXTRA_LDFLAGS "-Wl,-framework,OpenGLES")
+    list(APPEND PKGCONFIG_LDFLAGS "-Wl,-framework,OpenGLES")
+    list(APPEND CMAKE_LIBS "$<LINK_LIBRARY:FRAMEWORK,OpenGLES>")
   endif()
   if(SDL_FRAMEWORK_QUARTZCORE)
     if(IOS OR TVOS)
-      list(APPEND EXTRA_LDFLAGS "-Wl,-framework,QuartzCore")
+      list(APPEND PKGCONFIG_LDFLAGS "-Wl,-framework,QuartzCore")
+      list(APPEND CMAKE_LIBS "$<LINK_LIBRARY:FRAMEWORK,QuartzCore>")
     else()
-      list(APPEND EXTRA_LDFLAGS "-Wl,-weak_framework,QuartzCore")
+      list(APPEND PKGCONFIG_LDFLAGS "-Wl,-weak_framework,QuartzCore")
+      list(APPEND CMAKE_LIBS "$<LINK_LIBRARY:WEAK_FRAMEWORK,QuartzCore>")
     endif()
   endif()
   if(SDL_FRAMEWORK_UIKIT)
-    list(APPEND EXTRA_LDFLAGS "-Wl,-framework,UIKit")
+    list(APPEND PKGCONFIG_LDFLAGS "-Wl,-framework,UIKit")
+    list(APPEND CMAKE_LIBS "$<LINK_LIBRARY:FRAMEWORK,UIKit>")
   endif()
   if(SDL_FRAMEWORK_COREHAPTICS)
     find_library(COREHAPTICS CoreHaptics)
     if(COREHAPTICS)
-      list(APPEND EXTRA_LDFLAGS "-Wl,-weak_framework,CoreHaptics")
+      list(APPEND PKGCONFIG_LDFLAGS "-Wl,-weak_framework,CoreHaptics")
+      list(APPEND CMAKE_LIBS "$<LINK_LIBRARY:WEAK_FRAMEWORK,CoreHaptics>")
     endif()
   endif()
 
@@ -3152,7 +3176,7 @@ endif()
 
 # Clean up the different lists
 listtostr(EXTRA_LIBS _EXTRA_LIBS "-l")
-set(SDL_STATIC_LIBS ${EXTRA_LDFLAGS} ${_EXTRA_LIBS})
+set(SDL_STATIC_LIBS ${EXTRA_LDFLAGS} ${_EXTRA_LIBS} ${PKGCONFIG_LDFLAGS})
 list(REMOVE_DUPLICATES SDL_STATIC_LIBS)
 listtostr(SDL_STATIC_LIBS _SDL_STATIC_LIBS)
 set(SDL_STATIC_LIBS ${_SDL_STATIC_LIBS})
@@ -3442,7 +3466,7 @@ if(SDL_SHARED)
     set_property(TARGET SDL2 APPEND_STRING PROPERTY STATIC_LIBRARY_FLAGS " /NODEFAULTLIB")
   endif()
   # FIXME: if CMAKE_VERSION >= 3.13, use target_link_options for EXTRA_LDFLAGS
-  target_link_libraries(SDL2 PRIVATE ${EXTRA_LIBS} ${EXTRA_LDFLAGS} ${EXTRA_LDFLAGS_BUILD} ${CMAKE_DEPENDS})
+  target_link_libraries(SDL2 PRIVATE ${EXTRA_LIBS} ${EXTRA_LDFLAGS} ${EXTRA_LDFLAGS_BUILD} ${CMAKE_LIBS})
   target_include_directories(SDL2 PUBLIC
       "$<BUILD_INTERFACE:${SDL2_BINARY_DIR}/include>"
       "$<BUILD_INTERFACE:${SDL2_BINARY_DIR}/include/SDL2>"
@@ -3478,7 +3502,7 @@ if(SDL_STATIC)
   target_compile_definitions(SDL2-static PRIVATE SDL_STATIC_LIB)
   # TODO: Win32 platforms keep the same suffix .lib for import and static
   # libraries - do we need to consider this?
-  target_link_libraries(SDL2-static PRIVATE ${EXTRA_LIBS} ${EXTRA_LDFLAGS} ${CMAKE_DEPENDS})
+  target_link_libraries(SDL2-static PRIVATE ${EXTRA_LIBS} ${EXTRA_LDFLAGS} ${CMAKE_LIBS})
   target_include_directories(SDL2-static PUBLIC
       "$<BUILD_INTERFACE:${SDL2_BINARY_DIR}/include>"
       "$<BUILD_INTERFACE:${SDL2_BINARY_DIR}/include/SDL2>"

cmake/sdlchecks.cmake

@@ -119,7 +119,7 @@ macro(CheckALSA)
         endif()
       endif()
       if(NOT HAVE_ALSA_SHARED)
-        list(APPEND CMAKE_DEPENDS ALSA::ALSA)
+        list(APPEND CMAKE_LIBS ALSA::ALSA)
         list(APPEND PKGCONFIG_DEPENDS alsa)
       endif()
       set(HAVE_SDL_AUDIO TRUE)

cmake/test/CMakeLists.txt

@@ -3,6 +3,8 @@
 cmake_minimum_required(VERSION 3.12)
 project(sdl_test LANGUAGES C)
 
+include(CheckLanguage)
+include(FeatureSummary)
 include(GenerateExportHeader)
 
 if(ANDROID)
@@ -19,14 +21,23 @@ cmake_policy(SET CMP0074 NEW)
 # Override CMAKE_FIND_ROOT_PATH_MODE to allow search for SDL2 outside of sysroot
 set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE NEVER)
 
-include(FeatureSummary)
-
 option(TEST_SHARED "Test linking to shared SDL2 library" ON)
 add_feature_info("TEST_SHARED" TEST_SHARED "Test linking with shared library")
 
 option(TEST_STATIC "Test linking to static SDL2 library" ON)
 add_feature_info("TEST_STATIC" TEST_STATIC "Test linking with static library")
 
+if(APPLE)
+    # multiple values for CMAKE_OSX_ARCHITECTURES not supported with Swift
+    list(LENGTH CMAKE_OSX_ARCHITECTURES count_osx_archs)
+    if(count_osx_archs LESS_EQUAL 1)
+        check_language(Swift)
+        if(CMAKE_Swift_COMPILER)
+            enable_language(Swift)
+        endif()
+    endif()
+endif()
+
 if(TEST_SHARED)
     find_package(SDL2 REQUIRED CONFIG COMPONENTS SDL2)
     if(EMSCRIPTEN OR (WIN32 AND NOT WINDOWS_STORE))
@@ -75,6 +86,12 @@ if(TEST_SHARED)
     generate_export_header(sharedlib-shared-vars EXPORT_MACRO_NAME MYLIBRARY_EXPORT)
     target_compile_definitions(sharedlib-shared-vars PRIVATE "EXPORT_HEADER=\"${CMAKE_CURRENT_BINARY_DIR}/sharedlib-shared-vars_export.h\"")
     set_target_properties(sharedlib-shared-vars PROPERTIES C_VISIBILITY_PRESET "hidden")
+
+    if(CMAKE_Swift_COMPILER)
+        add_executable(swift-shared main.swift)
+        target_include_directories(swift-shared PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/swift")
+        target_link_libraries(swift-shared PRIVATE SDL2::SDL2)
+    endif()
 endif()
 
 if(TEST_STATIC)
@@ -111,6 +128,12 @@ if(TEST_STATIC)
         target_link_libraries(cli-static-vars PRIVATE ${SDL2_STATIC_LIBRARIES})
         target_include_directories(cli-static-vars PRIVATE ${SDL2_INCLUDE_DIRS})
     endif()
+
+    if(CMAKE_Swift_COMPILER)
+        add_executable(swift-static main.swift)
+        target_include_directories(swift-static PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/swift")
+        target_link_libraries(swift-static PRIVATE SDL2::SDL2-static)
+    endif()
 endif()
 
 message(STATUS "SDL2_PREFIX:            ${SDL2_PREFIX}")

cmake/test/main.swift

@@ -0,0 +1,12 @@
+/* Contributed by Piotr Usewicz (https://github.com/pusewicz) */
+
+import SDL2
+
+guard SDL_Init(Uint32(SDL_INIT_VIDEO)) == 0 else {
+  fatalError("SDL_Init error: \(String(cString: SDL_GetError()))")
+}
+
+var sdlVersion = SDL_version()
+SDL_GetVersion(&sdlVersion)
+
+print("SDL version: \(sdlVersion.major).\(sdlVersion.minor).\(sdlVersion.patch)")

cmake/test/swift/module.modulemap

@@ -0,0 +1,4 @@
+module SDL2 [extern_c] {
+    header "shim.h"
+    export *
+}

cmake/test/swift/shim.h

@@ -0,0 +1,3 @@
+/* Contributed by Piotr Usewicz (https://github.com/pusewicz) */
+
+#include "SDL.h"

sdl2-config.cmake.in

@@ -56,6 +56,9 @@ list(APPEND _sdl2_libdirs "${SDL2_LIBDIR}")
 string(REGEX MATCHALL "(-[lm]([-a-zA-Z0-9._]+))|(-Wl,[^ ]*framework[^ ]*)|(-pthread)" _sdl2_static_private_libs "${_sdl2_static_private_libs_in}")
 string(REGEX REPLACE "^-l" "" _sdl2_static_private_libs "${_sdl2_static_private_libs}")
 string(REGEX REPLACE ";-l" ";" _sdl2_static_private_libs "${_sdl2_static_private_libs}")
+string(REGEX REPLACE "-Wl,-framework,([a-zA-Z0-9_]+)" "$<LINK_LIBRARY:FRAMEWORK,\\1>" _sdl2_static_private_libs "${_sdl2_static_private_libs}")
+string(REGEX REPLACE "-Wl,-weak_framework,([a-zA-Z0-9_]+)" "$<LINK_LIBRARY:WEAK_FRAMEWORK,\\1>" _sdl2_static_private_libs "${_sdl2_static_private_libs}")
+
 string(REGEX MATCHALL "-L([-a-zA-Z0-9._/]+)" _sdl2_static_private_libdirs "${_sdl2_static_private_libs_in}")
 string(REGEX REPLACE "^-L" "" _sdl2_static_private_libdirs "${_sdl2_static_private_libdirs}")
 string(REGEX REPLACE ";-L" ";" _sdl2_static_private_libdirs "${_sdl2_static_private_libdirs}")