Re: [Boost-bugs] [Boost C++ Libraries] #4594: Boost exception classes do not have GCC default visibility

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #4594: Boost exception classes do not have GCC default visibility
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2011-07-08 14:56:16

#4594: Boost exception classes do not have GCC default visibility
------------------------------------------------------------+---------------
  Reporter:  Jonathan Jones <jonathan.jones@…>              |       Owner:  emildotchevski
      Type:  Patches                                        |      Status:  closed        
 Milestone:  To Be Determined                               |   Component:  exception     
   Version:  Boost 1.40.0                                   |    Severity:  Showstopper   
Resolution:  fixed                                          |    Keywords:                
------------------------------------------------------------+---------------

Comment (by mark.schisler@…):

 This bug is actually causing X-Code 4.01 and LLVM/GCC 4.2 to not link
 Boost 1.46.1 correctly with or without symbols hidden. I ended up with the
 following linker error.
 {{{
 ld: bad codegen, pointer diff in
 boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<std::runtime_error>
 >::rethrow() constto global weak symbol vtable for boost::exceptionfor
 architecture i386
 collect2: ld returned 1 exit status
 }}}

 I'm not sure if it's a minimal solution or not, but I was able to resolve
 the problem by applying a fix similar to what was suggested by Jonathan.
 I enclosed exception/exception.hpp and exception/detail/exception_ptr.hpp
 in the following guards:
 {{{
 #if defined(__GNUC__)
 # if (__GNUC__ == 4 && __GNUC_MINOR__ >= 1) || (__GNUC__ > 4)
 #  pragma GCC visibility push (default)
 # endif
 #endif

 #if defined(__GNUC__)
 # if (__GNUC__ == 4 && __GNUC_MINOR__ >= 1) || (__GNUC__ > 4)
 #  pragma GCC visibility pop
 # endif
 #endif
 }}}

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/4594#comment:11>
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