tree c7d40a33c6c6d73ff0954a616d5897a1289e7813
parent 6187edd41e318f9c434ba178fb32a8ef2b07e5da
author Chris Mumford <cmumford@google.com> 1657029124 -0700
committer Sam Lantinga <slouken@libsdl.org> 1657032657 -0700

Added include: libkern/OSAtomic.h

When building on macOS without gcc (e.g. clang) where HAVE_GCC_ATOMICS
is not defined, `SDL_AtomicTryLock` will call
`OSAtomicCompareAndSwap32Barrier` which is not yet declared.
Including OSAtomic.h on OSX resolves this error/warning:

    SDL_spinlock.c:125:12: error: implicit declaration of function
      'OSAtomicCompareAndSwap32Barrier' is invalid in
      C99 [-Werror,-Wimplicit-function-declaration]
        return OSAtomicCompareAndSwap32Barrier(0, 1, lock);

This was reported in issue #3885 but marked Invalid and closed - possibly
because the default CMake build uses gcc instead of clang.