yuxihu opened a new pull request #14615: Add PushAsyncPtr and PushSyncPtr APIs in engine URL: https://github.com/apache/incubator-mxnet/pull/14615 std::function definition is not compatible between GCC [4.x](https://github.com/gcc-mirror/gcc/blob/gcc-4_8_4-release/libstdc++-v3/include/std/functional#L2069) and GCC [5.x](https://github.com/gcc-mirror/gcc/blob/gcc-5_4_0-release/libstdc++-v3/include/std/functional#L1854). The incompatibility caused [segmentation fault](https://github.com/horovod/horovod/issues/884) when a third-party library compiled with GCC 5+ uses the PushAsync/PushSync interfaces in engine. To avoid the above incompatibility issue, this PR addes PushAsyncPtr/PushSyncPtr APIs in engine. These two APIs take function pointer instead of std::function as the engine execution function.
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