lebeg commented on issue #15369: Fix build with system's openmp URL: https://github.com/apache/incubator-mxnet/pull/15369#issuecomment-505872172 I'm afraid that this change is rather a complicated one due to long discussions that have not ended yet. You can find more info on the dev mailing list: [[Discussion] Remove bundled llvm OpenMP](https://lists.apache.org/thread.html/4827f0f742b6e7e070da350ea81226d059401527f3072ce8b33c1fdf@%3Cdev.mxnet.apache.org%3E). Initially the proposed change was in this PR [#12160: Remove conflicting llvm OpenMP from cmake builds ](https://github.com/apache/incubator-mxnet/pull/12160). We have already provided performance data on this, you can find and announcement on dev [here](https://lists.apache.org/thread.html/53030388434c90552d8dbed13488e25c1b153c53fc5970369f715e48@%3Cdev.mxnet.apache.org%3E) and the document [here](https://cwiki.apache.org/confluence/x/2wclBg). That was not enough, for reasons that are unclear to me, to convince everybody on validity and necessity of this change. Latest discussions happen in following dev threads: [OMP](https://lists.apache.org/thread.html/a4435d48f4253c85821e19828e57f706582926f70cd9f73cbe2dc080@%3Cdev.mxnet.apache.org%3E) and [[VOTE] Remove conflicting OpenMP from CMake builds](https://lists.apache.org/thread.html/f9897d76cd073f7a83cf6837ccacaf70670a592d727f0c2baa7a503b@%3Cdev.mxnet.apache.org%3E). @hubutui If you feel motivated enough to proceed with this change you can join the debate.
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