Irina Boverman created PROTON-250:

             Summary: Add -fvisibility option when building shared libraries 
                 Key: PROTON-250
             Project: Qpid Proton
          Issue Type: Improvement
          Components: proton-c
    Affects Versions: 0.3
         Environment: GNU Compiler
            Reporter: Irina Boverman
            Priority: Minor

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" 

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:

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