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Added include: libkern/OSAtomic.h

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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.
This commit is contained in:
Chris Mumford 2022-07-05 06:52:04 -07:00 committed by Sam Lantinga
parent 6187edd41e
commit 98411c0d33
1 changed files with 4 additions and 0 deletions
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4
src/atomic/SDL_spinlock.c
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@ -44,6 +44,10 @@
#include <kernel.h> #include <kernel.h>
#endif #endif
#if !defined(HAVE_GCC_ATOMICS) && defined(__MACOSX__)
#include <libkern/OSAtomic.h>
#endif
#if defined(__WATCOMC__) && defined(__386__) #if defined(__WATCOMC__) && defined(__386__)
SDL_COMPILE_TIME_ASSERT(locksize, 4==sizeof(SDL_SpinLock)); SDL_COMPILE_TIME_ASSERT(locksize, 4==sizeof(SDL_SpinLock));
extern __inline int _SDL_xchg_watcom(volatile int *a, int v); extern __inline int _SDL_xchg_watcom(volatile int *a, int v);