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From "Andy Isaacson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3742) libhdfs symbol visibility issues
Date Mon, 30 Jul 2012 23:58:35 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13425403#comment-13425403
] 

Andy Isaacson commented on HDFS-3742:
-------------------------------------

It's much better to use a linker script rather than attempting to get all of the visibility
information correctly represented in the source code.

Here's a reasonably concise intro to the topic: http://stackoverflow.com/questions/435352/limiting-visibility-of-symbols-when-linking-shared-libraries
 
                
> libhdfs symbol visibility issues
> --------------------------------
>
>                 Key: HDFS-3742
>                 URL: https://issues.apache.org/jira/browse/HDFS-3742
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.2.0-alpha
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>            Priority: Minor
>
> libhdfs symbols should be hidden unless they're part of the API.  If we don't hide symbols,
they could conflict with symbols in a library user's program.
> This can be accomplished with __attribute__((visibility)) like this:
> {code}
> void __attribute__((visibility("hidden"))) bar(int i);
> {code}

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