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https://issues.apache.org/jira/browse/ORC-1810?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17905014#comment-17905014
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Hao Zou commented on ORC-1810:
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I'll take care of this.
> Offline build support
> ---------------------
>
> Key: ORC-1810
> URL: https://issues.apache.org/jira/browse/ORC-1810
> Project: ORC
> Issue Type: Improvement
> Components: C++
> Reporter: Kouhei Sutou
> Assignee: Hao Zou
> Priority: Minor
>
> The C++ implementation always downloads orc-fromat by
> {{ExternalProject_Add}}:
> https://github.com/apache/orc/blob/48118e0493d94a7f83ddb3814de22462b07396e2/cmake_modules/ThirdpartyToolchain.cmake#L139-L147
> Could you provide a way to avoid it? For example, we may be able to vendor
> orc-format to {{orc-X.Y.Z.tar.gz}} source archive.
> Background: Apache Arrow supports offline build:
> https://arrow.apache.org/docs/developers/cpp/building.html#offline-builds
> It uses pre-downloaded archives instead of downloading archives in build
> phase. We can download {{orc-X.Y.Z.tar.gz}} and use it in Apache Arrow build.
> But we can't use ORC with our offline build support. Because ORC always
> downloads orc-format in build phase.
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