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https://issues.apache.org/jira/browse/PROTON-250?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15147756#comment-15147756
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ASF subversion and git services commented on PROTON-250:
--------------------------------------------------------

Commit 874d85b2d6ec53e4ca9e75c3018862f84cf18300 in qpid-proton's branch 
refs/heads/master from [~astitcher]
[ https://git-wip-us.apache.org/repos/asf?p=qpid-proton.git;h=874d85b ]

PROTON-250: Fix misc symbol visibility issues:
- Hide all library internal only symbols
- Make log.h export only unmangled C symbols


> Add -fvisibility option when building shared libraries 
> -------------------------------------------------------
>
>                 Key: PROTON-250
>                 URL: https://issues.apache.org/jira/browse/PROTON-250
>             Project: Qpid Proton
>          Issue Type: Improvement
>          Components: proton-c
>    Affects Versions: 0.3
>         Environment: GNU Compiler
>            Reporter: Irina Boverman
>            Assignee: Andrew Stitcher
>            Priority: Minor
>              Labels: patch
>         Attachments: proton.patch
>
>
> Add an option to "hide" symbols in shared libraries except when they are 
> declared public.
> Extends efforts already in place for Windows builds.
> Excludes an effort to determine what symbols should be considered "public" 
> interfaces.
> The gcc 4 -fvisibility option is said to:
> ...very substantially improve linking and load times of shared object 
> libraries, produce more optimized code, provide near-perfect API export and 
> prevent symbol clashes. It is strongly recommended that you use this in any 
> shared objects you distribute.
> See here: http://gcc.gnu.org/wiki/Visibility
> Attached patch (patch.txt) will build libqpid-proton.so shared library using 
> this flag.
> It reduces number of symbols from 700+ to 500+.



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