Bug #16774 ยป 0001-Don-t-require-sub-word-atomics.patch
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])
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AC_CACHE_CHECK([for __atomic builtins], [rb_cv_gcc_atomic_builtins], [
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AC_TRY_LINK([unsigned char atomic_var;],
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AC_TRY_LINK([unsigned int atomic_var;],
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[
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__atomic_exchange_n(&atomic_var, 0, __ATOMIC_SEQ_CST);
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__atomic_exchange_n(&atomic_var, 1, __ATOMIC_SEQ_CST);
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| ... | ... | |
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])
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AC_CACHE_CHECK([for __sync builtins], [rb_cv_gcc_sync_builtins], [
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AC_TRY_LINK([unsigned char atomic_var;],
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AC_TRY_LINK([unsigned int atomic_var;],
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[
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__sync_lock_test_and_set(&atomic_var, 0);
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__sync_lock_test_and_set(&atomic_var, 1);
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