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https://issues.apache.org/jira/browse/HADOOP-16236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16809007#comment-16809007
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Eric Yang commented on HADOOP-16236:
------------------------------------
Free software foundation consider ASL 2.0 compatible with GPLv3, but ASF says
this is [one way
compatible|https://apache.org/licenses/GPL-compatibility.html]. GPL exemption
based on [GPL exemption
FAQ|https://www.gnu.org/licenses/gcc-exception-3.1-faq.en.html]:
{quote}If you did use GPL-incompatible software in conjunction with GCC during
the Compilation Process, you would not be able to take advantage of this
permission. Since all of the object code that GCC generates is derived from
these GPLed libraries, that means you would be required to follow the terms of
the GPL when propagating any of that object code. You could not use GCC to
develop your own GPL-incompatible software.{quote}
>From Apache point of view, GPL exemption can not be applied because compiler
>is working with Apache licensed source code, which is confusing and maybe
>incompatible.
> Update C code to run with c99 standard
> --------------------------------------
>
> Key: HADOOP-16236
> URL: https://issues.apache.org/jira/browse/HADOOP-16236
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Eric Yang
> Priority: Major
>
> Several files in Hadoop common uses gnu99 standard for writing code. This
> includes:
> - inline assembly in bulk_crc32_x86.c
> - assignment between function pointer and ‘void *’ in SnappyCompressor.c.
> Apache httpd server and important Apache projects are using [c89
> standard|https://github.com/apache/httpd/blob/16211a8cdd52251cb7ae251e693b9053fb545e20/configure.in#L636]
> for coding. It would be nice if Hadoop can compile using c99 standard to
> avoid grey area with GPL license.
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