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https://issues.apache.org/jira/browse/IMPALA-8529?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon resolved IMPALA-8529.
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Resolution: Fixed
Fix Version/s: Impala 3.3.0
Seems this works now after we upgraded to CMake 3.14, even without changes to
CMakeFiles (at least when I run ninja -v I see ccache in use)
> ccache is ignored when using ninja generator
> --------------------------------------------
>
> Key: IMPALA-8529
> URL: https://issues.apache.org/jira/browse/IMPALA-8529
> Project: IMPALA
> Issue Type: Task
> Reporter: Todd Lipcon
> Priority: Major
> Fix For: Impala 3.3.0
>
>
> The CMakeLists.txt sets up ccache by using RULE_LAUNCH_PREFIX, which is only
> respected by the Makefile generator. So, if we use ninja (which is generally
> better at parallelism) then ccache won't kick in. Newer versions of cmake
> have more explicit support for ccache that ought to also work with the ninja
> generator.
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