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https://issues.apache.org/jira/browse/ARROW-6447?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16922560#comment-16922560
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Wes McKinney commented on ARROW-6447:
-------------------------------------
All of the toolchain libraries are dependencies of the entire {{arrow_objlib}}
target, so the build graph blocks until jemalloc_ep is complete. Really
jemalloc_ep should only be a dependency of compiling memory_pool.cc but I
haven't figured out how to convince CMake to do that
> [C++] Builds with ARROW_JEMALLOC=ON wait until jemalloc_ep is complete before
> building any libarrow .cc files
> -------------------------------------------------------------------------------------------------------------
>
> Key: ARROW-6447
> URL: https://issues.apache.org/jira/browse/ARROW-6447
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Wes McKinney
> Priority: Major
>
> This has been a frustration for me that my builds wait for the jemalloc_ep
> build to complete before proceeding to compile any C++ files for libarrow.
> Since only memory_pool.cc depends on jemalloc_ep, there must be some way to
> create a dependency between that single C++ file and jemalloc_ep. I spent a
> few minutes Googling about it but did not come up with an easy answer
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