James Clampffer commented on HDFS-12237:

Disregard my last comment, I misread the patch and thought it was getting rid 
of a line.  Adding PROTOBUF_INCLUDE_DIRS for try_compile makes sense, and the 
warning should be sufficient to help people sort out linking issues.


> libhdfs++: PROTOC_IS_COMPATIBLE check fails if protobuf library is built from 
> source
> ------------------------------------------------------------------------------------
>                 Key: HDFS-12237
>                 URL: https://issues.apache.org/jira/browse/HDFS-12237
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs-client
>            Reporter: Anatoli Shein
>            Assignee: Anatoli Shein
>         Attachments: HDFS-12237.HDFS-8707.000.patch, 
> HDFS-12237.HDFS-8707.001.patch, HDFS-12237.HDFS-8707.002.patch
> Looks like the PROTOC_IS_COMPATIBLE check fails when Protobuf library is 
> built from source. This happens because the check if performed during the 
> cmake phase, and the protobuf library needed for this test is build from 
> source only during the make phase, so the check fails with "ld: cannot find 
> -lprotobuf" because it was not built yet. We should probably restrict this 
> test to run only in cases when Protobuf library is already present and not 
> being built from source.

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