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https://issues.apache.org/jira/browse/HDFS-10355?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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James Clampffer reassigned HDFS-10355:
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Assignee: James Clampffer
> Fix thread_local related build issue on Mac OS X
> ------------------------------------------------
>
> Key: HDFS-10355
> URL: https://issues.apache.org/jira/browse/HDFS-10355
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: hdfs-client
> Environment: OS: Mac OS X 10.11
> clang: Apple LLVM version 7.0.2 (clang-700.1.81)
> Reporter: Tibor Kiss
> Assignee: James Clampffer
>
> The native hdfs library uses C++11 features heavily.
> One of such feature is thread_local storage class which is supported in GCC,
> Visual Studio and the community version of clang compiler, but not by Apple's
> clang (which is default on OS X boxes).
> See further details here: http://stackoverflow.com/a/29929949
> Even though not many Hadoop cluster runs on OS X developers still use this
> platform for development.
> The problem can be solved multiple ways:
> a) Stick to gcc/g++ or community based clang on OS X. Developers will need
> extra steps to build Hadoop.
> b) Workaround thread_local with a helper class.
> c) Get rid of all the globals marked with thread_local. Interface change
> will be erquired.
> d) Disable multi threading support in the native client on OS X and document
> this limitation.
> Compile error related to thread_local:
> {noformat}
> [exec]
> /Users/tiborkiss/workspace/apache-hadoop/hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/lib/bindings/c/hdfs.cc:66:1:
> error: thread-local storage is not supported for the current target
> [exec] thread_local std::string errstr;
> [exec] ^
> [exec]
> /Users/tiborkiss/workspace/apache-hadoop/hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/lib/bindings/c/hdfs.cc:87:1:
> error: thread-local storage is not supported for the current target
> [exec] thread_local std::experimental::optional<fs_event_callback>
> fsEventCallback;
> [exec] ^
> [exec]
> /Users/tiborkiss/workspace/apache-hadoop/hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/lib/bindings/c/hdfs.cc:88:1:
> error: thread-local storage is not supported for the current target
> [exec] thread_local std::experimental::optional<file_event_callback>
> fileEventCallback;
> [exec] ^
> [exec] 1 warning and 3 errors generated.
> {noformat}
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