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Omit atomic_{,un}signed_lock_free if unsupported 

On targets that have limited atomic support, e.g. ones that define
ATOMIC_*_LOCK_FREE to '1' ("sometimes lock free"), we would end up
referencing yet-undefined __libcpp_{,un}signed_lock_free.

This commit adds a guard to prevent these references for such
targets.

Differential Revision: https://reviews.llvm.org/D118391
This commit is contained in:
Brian Cain 2022-01-27 08:09:11 -08:00
parent e900f0584e
commit d5ab243c6f
1 changed files with 3 additions and 0 deletions
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3
libcxx/include/atomic
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@ -2692,10 +2692,13 @@ typedef conditional<_LIBCPP_CONTENTION_LOCK_FREE, __cxx_contention_t, char>::typ
typedef conditional<_LIBCPP_CONTENTION_LOCK_FREE, __cxx_contention_t, unsigned char>::type __libcpp_unsigned_lock_free;
#else
// No signed/unsigned lock-free types
#define _LIBCPP_NO_LOCK_FREE_TYPES
#endif
#if !defined(_LIBCPP_NO_LOCK_FREE_TYPES)
typedef atomic<__libcpp_signed_lock_free> atomic_signed_lock_free;
typedef atomic<__libcpp_unsigned_lock_free> atomic_unsigned_lock_free;
#endif
#define ATOMIC_FLAG_INIT {false}
#define ATOMIC_VAR_INIT(__v) {__v}