SFML fails to build with GCC on macOS

[eXpl0it3r]

Describe your issue here

SFML currently actively prevents the usage of GCC on macOS, due to issues within the macOS SDK.

We currently don't see a way to fix this on our side and have to wait for either GCC or Apple to get this sorted.
Additionally, Apple-Clang seems to be the better alternative in most cases anyways, as such we don't see this as a priority.

This issue exist mainly as a catch-all for all the report we got overtime and in case someone is looking for an explanation.

In case someone can provide a fix in any capacity, we'd be more than happy to add support for GCC.
Note that by default gcc and g++ are just aliases for clang and clang++ respectively.

Steps to reproduce

Build SFML with GCC (not just the Clang aliases)

Expected behavior

Compilation succeedes

Actual behavior

Compilation fails

[ 19%] Building CXX object src/SFML/Window/CMakeFiles/sfml-window.dir/Joystick.cpp.o
cd /Users/eijkhout/Installation/sfml/build-2.6.0-macbookair-gcc12/src/SFML/Window && /opt/local/bin/g++ -DSFML_WINDOW_EXPORTS -I/Users/eijkhout/Installation/sfml/sfml-2.6.0/include -I/Users/eijkhout/Installation/sfml/sfml-2.6.0/src -I/Users/eijkhout/Installation/sfml/sfml-2.6.0/extlibs/headers/vulkan -isystem /Users/eijkhout/Installation/sfml/sfml-2.6.0/extlibs/headers/glad/include -iframework /Library/Developer/CommandLineTools/SDKs/MacOSX13.3.sdk/System/Library/Frameworks -O3 -DNDEBUG -arch arm64 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX13.3.sdk -mmacosx-version-min=13.0 -fPIC -fvisibility=hidden -stdlib=libc++  -Wall -Wextra -Wshadow -Wnon-virtual-dtor -Wcast-align -Wunused -Woverloaded-virtual -Wconversion -Wsign-conversion -Wdouble-promotion -Wformat=2 -Wnull-dereference -Wold-style-cast -Wpedantic -Wmisleading-indentation -Wduplicated-cond -Wlogical-op -Wduplicated-branches -MD -MT src/SFML/Window/CMakeFiles/sfml-window.dir/Joystick.cpp.o -MF CMakeFiles/sfml-window.dir/Joystick.cpp.o.d -o CMakeFiles/sfml-window.dir/Joystick.cpp.o -c /Users/eijkhout/Installation/sfml/sfml-2.6.0/src/SFML/Window/Joystick.cpp
In file included from /Users/eijkhout/Installation/sfml/sfml-2.6.0/src/SFML/Window/OSX/JoystickImpl.hpp:35,
                 from /Users/eijkhout/Installation/sfml/sfml-2.6.0/src/SFML/Window/JoystickImpl.hpp:102,
                 from /Users/eijkhout/Installation/sfml/sfml-2.6.0/src/SFML/Window/JoystickManager.hpp:32,
                 from /Users/eijkhout/Installation/sfml/sfml-2.6.0/src/SFML/Window/Joystick.cpp:29:
/Library/Developer/CommandLineTools/SDKs/MacOSX13.3.sdk/System/Library/Frameworks/IOKit.framework/Headers/hid/IOHIDDevice.h:273:34: error: 'dispatch_block_t' has not been declared
  273 |                                  dispatch_block_t               handler)
      |                                  ^~~~~~~~~~~~~~~~
make[3]: *** [src/SFML/Window/CMakeFiles/sfml-window.dir/Joystick.cpp.o] Error 1
make[2]: *** [src/SFML/Window/CMakeFiles/sfml-window.dir/all] Error 2
make[2]: *** Waiting for unfinished jobs....