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https://issues.apache.org/jira/browse/ARROW-3522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16650750#comment-16650750
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Wes McKinney commented on ARROW-3522:
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That first line is called before {{include(ThirdpartyToolchain)}}, though
https://github.com/apache/arrow/blob/master/cpp/CMakeLists.txt#L383
In any case we should get to the bottom of the issue you're having
> [C++] Remove -Wconversion from build flags
> ------------------------------------------
>
> Key: ARROW-3522
> URL: https://issues.apache.org/jira/browse/ARROW-3522
> Project: Apache Arrow
> Issue Type: Wish
> Components: C++
> Affects Versions: 0.11.0
> Reporter: Antoine Pitrou
> Priority: Major
>
> I would request removing {{-Wconversion}} from the CI build flags. It is
> overly finicky, generating errors for things such as converting a {{size_t}}
> to {{double}}. Furthermore, {{gbenchmark}} fails building with it, making it
> difficult to exercise locally.
> I will mention that MSVC's conversion warnings are vastly more reasonable.
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