[Boost-bugs] [Boost C++ Libraries] #6156: fenv.hpp broken on clang+glibc

Subject: [Boost-bugs] [Boost C++ Libraries] #6156: fenv.hpp broken on clang+glibc
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2011-11-21 20:03:51

#6156: fenv.hpp broken on clang+glibc
-------------------------------------------------+--------------------------
 Reporter:  Marc Glisse <marc.glisse@…>          |       Owner:         
     Type:  Bugs                                 |      Status:  new    
Milestone:  To Be Determined                     |   Component:  None   
  Version:  Boost 1.48.0                         |    Severity:  Problem
 Keywords:                                       |  
-------------------------------------------------+--------------------------
 Hello,

 with clang and glibc, boost doesn't protect against multiple inclusion of
 bits/fenv.h:

 #include <fenv.h>
 #include <boost/lexical_cast.hpp>

 /localhome/glisse2/include/boost/detail/fenv.hpp:22:11: warning: '_FENV_H'
 macro redefined
 /usr/include/fenv.h:24:9: note: previous definition is here
 /usr/include/x86_64-linux-gnu/bits/fenv.h:30:5: error: redefinition of
 enumerator 'FE_INVALID'
 ...

 Someone apparently thought it was a good idea to add some subtleties to
 fenv.hpp to help people who misconfigured clang, but that is imho a bad
 idea and the special case should be removed (note that clang-3.0 has a
 good default configuration). If you insist on keeping it, please ensure
 that _FENV_H is not defined.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/6156>
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