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https://issues.apache.org/jira/browse/HDFS-1619?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13044181#comment-13044181
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Eli Collins commented on HDFS-1619:
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bq. The idea behind AC_PROG_CC_C99 is to try and ask C compiler be C99
compliant and we definitely have to do that if for nothing else just to make
sure that #include <stdint.h> alway works
AC_PROG_CC_C99 tries to enable c99 mode on the compiler (via CC), we don't need
to do that as we don't use c99 mode, we just require some c99 headers be
present. Not sure how to tell autoconf you require these headers w/o telling it
to try to enable c99 mode by default. Using AC_PROG_CC_C99 is fine (we could
legitimately start using c99 features in libhdfs and fuse-dfs), just saying we
can remove these AC_* type defines w/o defining AC_PROG_CC_C99.
> Does libhdfs really need to depend on AC_TYPE_INT16_T, AC_TYPE_INT32_T,
> AC_TYPE_INT64_T and AC_TYPE_UINT16_T ?
> --------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-1619
> URL: https://issues.apache.org/jira/browse/HDFS-1619
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Roman Shaposhnik
> Assignee: Konstantin Shvachko
> Attachments: HDFS-1619.patch.txt
>
>
> Currently configure.ac uses AC_TYPE_INT16_T, AC_TYPE_INT32_T, AC_TYPE_INT64_T
> and AC_TYPE_UINT16_T and thus requires autoconf 2.61 or higher.
> This prevents using it on such platforms as CentOS/RHEL 5.4 and 5.5. Given
> that those are pretty popular and also given that it is really difficult to
> find a platform
> these days that doesn't natively define intXX_t types I'm curious as to
> whether we can simply remove those macros or perhaps fail ONLY if we happen
> to be on such
> a platform.
> Here's a link to GNU autoconf docs for your reference:
> http://www.gnu.org/software/hello/manual/autoconf/Particular-Types.html
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