leezu edited a comment on issue #17842: CI: Attempt fixing illegal instruction errors URL: https://github.com/apache/incubator-mxnet/pull/17842#issuecomment-599671409 @marcoabreu the flag disables AVX instruction set. https://github.com/facebook/zstd contains code that can be vectorized. For whatever reason, gcc uses avx instruction set even if it shouldn't (cf https://github.com/apache/incubator-mxnet/issues/14664) and we need to explicitly disable it as the resulting binary is used on different machines thanks to the docker cache.
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