GauthamBanasandra opened a new pull request, #4601:
URL: https://github.com/apache/hadoop/pull/4601
* This PR ensures that the Protobuf generated headers
are always included first, even when these headers
are included transitively.
* This problem is specific to Windows only.
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### Description of PR
We need to ensure that the Protobuf generated headers ([such as
ClientNamenodeProtocol.pb.h](https://github.com/apache/hadoop/blob/cce5a6f6094cefd2e23b73d202cc173cf4fc2cc5/hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/lib/connection/datanodeconnection.h#L23))
are included at the top. In other words, `*.ph.h` should be the first header
files to be included in any of the .c/.cc/.h files. Otherwise, it causes symbol
redefinition errors during compilation. Also, we need to ensure that Protobuf
generated header files are the first ones to be included even in the case of
`transitive inclusion` of header files.
This issue seems to be specific to Windows only. Not sure why the other
platforms aren't running into this.
### How was this patch tested?
1. Tested this locally by building on my Windows system.
2. Hadoop Jenkins CI validation.
### For code changes:
- [x] Does the title or this PR starts with the corresponding JIRA issue id
(e.g. 'HADOOP-17799. Your PR title ...')?
- [ ] Object storage: have the integration tests been executed and the
endpoint declared according to the connector-specific documentation?
- [ ] If adding new dependencies to the code, are these dependencies
licensed in a way that is compatible for inclusion under [ASF
2.0](http://www.apache.org/legal/resolved.html#category-a)?
- [ ] If applicable, have you updated the `LICENSE`, `LICENSE-binary`,
`NOTICE-binary` files?
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