[Boost-bugs] [Boost C++ Libraries] #6060: Warning generated in SNC C++ compiler by use of __sync_fetch_and_add

Subject: [Boost-bugs] [Boost C++ Libraries] #6060: Warning generated in SNC C++ compiler by use of __sync_fetch_and_add
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2011-10-25 20:30:25

#6060: Warning generated in SNC C++ compiler by use of __sync_fetch_and_add
----------------------------------------------+-----------------------------
 Reporter:  Fernando Diaz <fdiaza@…>          |       Owner:  pdimov      
     Type:  Patches                           |      Status:  new         
Milestone:  To Be Determined                  |   Component:  smart_ptr   
  Version:  Boost 1.47.0                      |    Severity:  Optimization
 Keywords:                                    |  
----------------------------------------------+-----------------------------
 When compiling code that uses boost/shared_array.hpp in SNC C++ compiler,
 the following warning is generated:

 ../../SDKs/Boost/boost/smart_ptr/detail/sp_counted_base_sync.hpp(48,37):
 warning 68: integer conversion resulted in a change of sign

 in this line:

 {{{
 return __sync_fetch_and_add( pw, -1 );
 }}}

 I've managed to fix the warning by replacing "__sync_fetch_and_add" with
 "__sync_fetch_and_sub", and changing the second argument from "-1" to "1".
 I've included a patch, hope it helps.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/6060>
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