[jira] [Commented] (ARROW-12785) [CI] Nightly builds can't install GCC and OpenBLAS properly

["Jonathan Keane (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-12785?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17344882#comment-17344882 ] 

Jonathan Keane commented on ARROW-12785:
----------------------------------------

I can't fully explain why, but something about [https://github.com/Homebrew/homebrew-core/pull/76984] is triggering gcc to be installed with brew (which fails to link because there's a macos version of gfortran in the way).

[The last passing build does|https://github.com/ursacomputing/crossbow/runs/2563406333] not include gcc at all:


{code:java}
==> Installing dependencies for apache-arrow: gflags, glog, abseil, protobuf, re2, grpc, openblas, numpy, rapidjson, snappy and thrift
{code}

But subsequent builds have:
{code:java}
==> Installing dependencies for apache-arrow: gflags, glog, abseil, protobuf, re2, grpc, gcc, openblas, numpy, rapidjson, snappy and thrift
{code}

For now I'm removing the offending gfortran from the path so that brew will happily install gcc regardless. 


> [CI] Nightly builds can't install GCC and OpenBLAS properly
> -----------------------------------------------------------
>
>                 Key: ARROW-12785
>                 URL: https://issues.apache.org/jira/browse/ARROW-12785
>             Project: Apache Arrow
>          Issue Type: Task
>          Components: Continuous Integration
>            Reporter: Mauricio 'Pachá' Vargas Sepúlveda
>            Assignee: Jonathan Keane
>            Priority: Major
>
> This affects github-test-r-devdocs (R devdocs macOS-latest). The brew step to install gcc fails, and then OpenBLAS fails as well.
> See https://github.com/ursacomputing/crossbow/runs/2573031778#step:8:1494



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