Re: [Boost-bugs] [Boost C++ Libraries] #2309: Lack of g++ symbol visibility support in Boost.Thread

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #2309: Lack of g++ symbol visibility support in Boost.Thread
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2010-02-09 21:08:34

#2309: Lack of g++ symbol visibility support in Boost.Thread
------------------------------------------------------------------+---------
 Reporter:  rbock@…                                               |       Owner:  anthonyw
     Type:  Bugs                                                  |      Status:  new     
Milestone:  Boost 1.43.0                                          |   Component:  thread  
  Version:  Boost 1.36.0                                          |    Severity:  Problem 
 Keywords:  visibility catch exception thread thread_interrupted  |  
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Changes (by Scott Bailey <Bailey@…>):

 * cc: Bailey@… (added)
  * keywords:  visibility catch exception => visibility catch exception
               thread thread_interrupted
  * milestone:  Boost 1.37.0 => Boost 1.43.0

Comment:

 == Description ==
 thread_interrupted can't be caught when crossing shared object's
 boundaries when visibility is hidden.
 == Found In ==
 Boost v1.40, v1.41, and 1.42
 == Recreating ==
 Here is the setup:

 `MyCommon.so`
  - this lib contains some basic classes, one of which (`baseTRx`) has a
 `boost::thread`.
  - this lib includes `boost_system` and `boost_thread` using the --whole-
 archive flag (linux) and equivalent for darwin and win
  -- this was done to minimize the number of files the customer would
 receive, among other reasons...

 `MyTRx.so`
  - this lib contains a class derived from `baseTRx` (`myTRx`).
  - links to `MyCommon`

 `MyEXE`
  - this contains `main()`.
  - links to `MyCommon`
  - loads `MyTRx` at run time.
  - creates an instance of `myTRx`.
  - signals `MyEXE` (via `interupt()`) when its time to cleanly shut down

 Using GCC 4.2 w/ '''-fvisibility=hidden''', '''thread_interrupted isn't
 being caught''' in `myTRx` since it's being thrown from a different so
 with ''hidden visibility''.

 == Possible Fixes ==
 These are the options as I see them:
  - push, then set visibility to default in the BOOST_ABI_PREFIX.  Then pop
 in the BOOST_ABI_SUFFIX.
  - add class decorators to modify visibility of exceptions
 I provided a patch ([attachment:thread_interrupted.patch]) for the second
 option.  I am using this patch in a production environment.

 == Similar/possibly Related Defects ==
 This is similar to the following defects:
  - #2114 Patch for export symbols from shared library

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/2309#comment:3>
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