Kouhei Sutou created ORC-1810:
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Summary: 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
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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