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https://issues.apache.org/jira/browse/ARROW-6925?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16954127#comment-16954127
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John Norris commented on ARROW-6925:
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It appears to be set to gcc.
> [C++] Arrow fails to buld on MacOS 10.13.6 using brew gcc 7 and 8
> -----------------------------------------------------------------
>
> Key: ARROW-6925
> URL: https://issues.apache.org/jira/browse/ARROW-6925
> Project: Apache Arrow
> Issue Type: Bug
> Environment: MacOS 10.13.6 using both brew gcc 7 and 8.
> Reporter: John Norris
> Priority: Major
> Labels: C++
>
> Both SetupCxxFlags.cmake and ThirdpartyToolchain.cmake add -stdlib=libc++ to
> the compiler flags when APPLE is true, but if you're using GCC from brew (or
> presumably from anywhere other that Apple), this flag is not recognized and
> the build fails.
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