[jira] [Created] (HDFS-14394) Add -std=c99 / -std=gnu99 to libhdfs compile flags

["Sahil Takiar (JIRA)" <ji...@apache.org>]

Sahil Takiar created HDFS-14394:
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             Summary: Add -std=c99 / -std=gnu99 to libhdfs compile flags
                 Key: HDFS-14394
                 URL: https://issues.apache.org/jira/browse/HDFS-14394
             Project: Hadoop HDFS
          Issue Type: Task
          Components: hdfs-client, libhdfs, native
            Reporter: Sahil Takiar
            Assignee: Sahil Takiar


libhdfs compilation currently does not enforce a minimum required C version. As of today, the libhdfs build on Hadoop QA works, but when built on a machine with an outdated gcc / cc version where C89 is the default, compilation fails due to errors such as:

{code}
/build/hadoop/hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfs/jclasses.c:106:5: error: ‘for’ loop initial declarations are only allowed in C99 mode
for (int i = 0; i < numCachedClasses; i++) {
^
/build/hadoop/hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfs/jclasses.c:106:5: note: use option -std=c99 or -std=gnu99 to compile your code
{code}

We should add the -std=c99 / -std=gnu99 flags to libhdfs compilation so that we can enforce C99 as the minimum required version.



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