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https://issues.apache.org/jira/browse/HDFS-2042?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13045212#comment-13045212
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Allen Wittenauer commented on HDFS-2042:
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Setting of CFLAGS is almost always non-portable.
> Require c99 when building libhdfs
> ---------------------------------
>
> Key: HDFS-2042
> URL: https://issues.apache.org/jira/browse/HDFS-2042
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: libhdfs
> Reporter: Eli Collins
> Priority: Minor
>
> Per the discussion in HDFS-1619, libhdfs uses some c99 features, therefore we
> should use compile with c99 standard flags (eg c99 or gnu99 when using gcc)
> when building it. We could do this with autotools via AC_PROG_CC_C99 (which
> requires a more recent autotools) or by setting CLFAGS in
> src/c++/libhdfs/configure. We should perhaps rename src/c++ to src/c while
> we're at it since libhdfs is not written in c++ and libhdfs is the only
> subdirectory.
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