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cuiziwei
6a51857e90
When _LIBCPP_HAS_NO_CONTENTION_TABLE is defined, libcxx will not allocate the contention table used for semaphore implementation, which can save significant RAM on memory-constrained embedded systems. This optimization is particularly useful for NuttX targets where every byte of RAM matters. Signed-off-by: cuiziwei <cuiziwei@xiaomi.com>