Eric Yang created HADOOP-16236:
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             Summary: 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


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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