SDL2 无法在 macOS Big Sur 上编译

Question

在我的一个项目中，我使用 git 子模块下载 SDL2 库并进行编译。这给了我一个奇怪的错误，所以我尝试编译 SDL2 Standalone，但我得到了同样的错误。

我使用的是 13" MacBook Pro Big Sur

重现步骤：

    git clone https://github.com/libsdl-org/SDL.git
    cd SDL
    cmake . -Bbuild
    make -C ./build

我得到的错误是

In file included from /Users/<user>/Documents/side side projects/neural networks/libs/SDL/src/file/cocoa/SDL_rwopsbundlesupport.m:24:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.0.sdk/System/Library/Frameworks/Foundation.framework/Headers/Foundation.h:12:
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.0.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSBundle.h:91:143: error: function does not return NSString
- (NSAttributedString *)localizedAttributedStringForKey:(NSString *)key value:(nullable NSString *)value table:(nullable NSString *)tableName NS_FORMAT_ARGUMENT(1) NS_REFINED_FOR_SWIFT API_AVAILABLE(macos(12.0), ios(15.0), watchos(8.0), tvos(15.0));
                                                         ~~~~~~~~~~~~~~                                                                       ^                  ~
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.0.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:103:48: note: expanded from macro 'NS_FORMAT_ARGUMENT'
        #define NS_FORMAT_ARGUMENT(A) __attribute__ ((format_arg(A)))
                                                      ^          ~
1 error generated.
make[2]: *** [libs/SDL/CMakeFiles/SDL2.dir/src/file/cocoa/SDL_rwopsbundlesupport.m.o] Error 1
make[1]: *** [libs/SDL/CMakeFiles/SDL2.dir/all] Error 2
make: *** [all] Error 2

该消息暗示 Apple 自己的 SDK 文件无法编译，但这是不对的。更奇怪的是，我在另一个项目中使用带有 SDL2 的 git 子模块，但编译成功，我找不到这个项目和另一个项目之间的任何明显区别。

编辑：我使用 make -C ./build VERBOSE=1 将输出与编译成功的项目和编译失败的项目进行比较。

编译成功：

[  0%] Building C object libs/SDL/CMakeFiles/SDL2.dir/src/file/cocoa/SDL_rwopsbundlesupport.m.o
cd "/Users/<user>/Documents/side side projects/Legion/build/libs/SDL" && /usr/local/opt/llvm/bin/clang -DSDL2_EXPORTS -DUSING_GENERATED_CONFIG_H -I"/Users/<user>/Documents/side side projects/Legion/build/libs/SDL/include" -I"/Users/<user>/Documents/side side projects/Legion/libs/SDL/include" -g -O3 -idirafter "/Users/<user>/Documents/side side projects/Legion/libs/SDL/src/video/khronos" -D_THREAD_SAFE -msse3 -msse2 -msse -m3dnow -mmmx -Wshadow -fvisibility=hidden -Wdeclaration-after-statement -Werror=declaration-after-statement -fno-strict-aliasing -Wall  -fPIC -F/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.3.sdk/System/Library/Frameworks  -o CMakeFiles/SDL2.dir/src/file/cocoa/SDL_rwopsbundlesupport.m.o -c "/Users/<user>/Documents/side side projects/Legion/libs/SDL/src/file/cocoa/SDL_rwopsbundlesupport.m"

Take note of: -F/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.3.sdk/System/Library/Frameworks

编译失败：

[  0%] Building C object CMakeFiles/SDL2.dir/src/file/cocoa/SDL_rwopsbundlesupport.m.o
/usr/local/opt/llvm/bin/clang -DSDL2_EXPORTS -DUSING_GENERATED_CONFIG_H -I/Users/<user>/Desktop/SDL-main/build/include -I/Users/<user>/Desktop/SDL-main/include -idirafter "/Users/<user>/Desktop/SDL-main/src/video/khronos" -I/usr/local/Cellar/libusb/1.0.24/include/libusb-1.0 -D_THREAD_SAFE -msse3 -msse2 -msse -m3dnow -mmmx -Wshadow -fvisibility=hidden -Wdeclaration-after-statement -Werror=declaration-after-statement -fno-strict-aliasing -Wall  -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.0.sdk -mmacosx-version-min=11.5 -fPIC -o CMakeFiles/SDL2.dir/src/file/cocoa/SDL_rwopsbundlesupport.m.o -c /Users/<user>/Desktop/SDL-main/src/file/cocoa/SDL_rwopsbundlesupport.m

Take note of: /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.0.sdk

Answer 1

编译成功的项目和编译失败的项目唯一的区别是MacOS SDK版本。编译失败的使用MacOS SDK 12，成功的使用MacOS 11.3。在解决此问题之前，临时解决方案是将您的 MacOS SDK 降级到 11.3。

SDL2 无法在 macOS Big Sur 上编译

SDL2 doesn't compile on macos Big Sur

macos

objective-c

cmake

sdl-2