[Boost-bugs] [Boost C++ Libraries] #2569: export macro cannot be used on same line # in different files in same translation unit

Subject: [Boost-bugs] [Boost C++ Libraries] #2569: export macro cannot be used on same line # in different files in same translation unit
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2008-12-05 16:50:38

#2569: export macro cannot be used on same line # in different files in same
translation unit
---------------------------------+------------------------------------------
 Reporter:  kfriddile_at_[hidden]  |       Owner:  ramey        
     Type:  Patches              |      Status:  new          
Milestone:  Boost 1.38.0         |   Component:  serialization
  Version:  Boost 1.37.0         |    Severity:  Problem      
 Keywords:                       |  
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 In export.hpp the BOOST_CLASS_EXPORT macro calls the
 BOOST_CLASS_EXPORT_GUID macro which uses the __LINE__ directive in an
 attempt to create a globally unique variable name.  However, if multiple
 headers use the aforementioned macro on the same line #, and are included
 in the same translation unit, compilation will fail due to variable
 redefinition.  This scenario isn't unlikely, as I had three conflicting
 headers out of the five I included in a single cpp.  I have attached a
 patch in unified diff format that fixes this issue for me, but has not
 been run through any unit tests.

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Ticket URL: <https://svn.boost.org/trac/boost/ticket/2569>
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