[MacPorts] #32511: openjpeg @1.4-r697 openjpeg/ffmpeg/libjasper symbol collision

[MacPorts]

#32511: openjpeg @1.4-r697  openjpeg/ffmpeg/libjasper symbol collision
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 Reporter:  marin.saric@…          |       Owner:  macports-tickets@…                   
     Type:  defect                 |      Status:  new                                  
 Priority:  Normal                 |   Milestone:                                       
Component:  ports                  |     Version:  2.0.3                                
 Keywords:                         |        Port:  openjpeg libjasper                   
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 The purpose of this ticket is to point out a serious issue with OpenJPEG
 that can lead to unpredictable crashes and seek feedback and advice.

 I volunteer to cherry-pick the simple symbol-mangling patch from the
 OpenJPEG trunk and apply it to the stable version of OpenJPEG currently in
 MacPorts.

 This issue has been discussed and addressed in the OpenJPEG trunk:
 http://code.google.com/p/openjpeg/issues/detail?id=30

 Background information:
 {{{OpenJPEG}}} was designed as an alternative to {{{libjasper}}}, a
 library providing the JPEG2000 format functionality.
 Ideally, a project will use either {{{OpenJPEG}}} or {{{libjasper}}}.
 Some private symbols in OpenJPEG (such as {{{jp2_decode}}}), which are
 never called by the library user's code end up colliding with the public
 library API symbols of {{{libjasper}}}.

 {{{ffmpeg}}} is a popular library that is compiled with {{{OpenJPEG}}}
 support in MacPorts.

 A program (or, even worse, a {{{dylib}}} plugin) relying on
 {{{libjasper}}} can also depend on {{{ffmpeg}}}. Even worse, a program
 loading a {{{dylib}}} plugin can have {{{OpenJPEG}}} already loaded,
 tripping up a segmentation fault once the plugin loads and the code to
 open a JPEG2000 file executes.

 A simple fix is to change the name of the offending private functions in
 the OpenJPEG code and recompile openjpeg.

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Ticket URL: <https://trac.macports.org/ticket/32511>
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