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https://issues.apache.org/jira/browse/HADOOP-12036?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14591418#comment-14591418
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Alan Burlison commented on HADOOP-12036:
----------------------------------------

Whilst there's quite a lot of change much of it is cosmetic - factoring out 
common code etc. The ARM support is self contained and I've simply moved it 
into a new shared location rather than modifying it. As I said above I've done 
the changes as a patch per project/subtree. The common changes are in 
hadoop-common-project so that patch needs applying first, but the other CMake 
infrastructure changes can be applied incrementally. I've left the old 
hadoop-common JNIFlags.cmake in place as it is used by other sub-projects. Once 
they have all been updated the old JNIFlags.cmake can then be removed.

There are two other categories of patch that aren't CMake related, those that 
make the existing code -Wall-clean and those that add Solaris support. Again, 
they are done on a per-subproject basis.

> Consolidate all of the cmake extensions in one directory
> --------------------------------------------------------
>
>                 Key: HADOOP-12036
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12036
>             Project: Hadoop Common
>          Issue Type: Sub-task
>            Reporter: Allen Wittenauer
>            Assignee: Alan Burlison
>         Attachments: prototype01.txt
>
>
> Rather than have a half-dozen redefinitions, custom extensions, etc, we 
> should move them all to one location so that the cmake environment is 
> consistent between the various native components.



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