Re: [Boost-bugs] [Boost C++ Libraries] #9766: boost >= 1.54 failes to compile with gcc-4.8.2 and LTO enabled

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #9766: boost >= 1.54 failes to compile with gcc-4.8.2 and LTO enabled
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2014-04-23 12:41:10

#9766: boost >= 1.54 failes to compile with gcc-4.8.2 and LTO enabled
-------------------------------+---------------------
  Reporter:  steffen@…         |      Owner:  andysem
      Type:  Bugs              |     Status:  new
 Milestone:  To Be Determined  |  Component:  log
   Version:  Boost 1.54.0      |   Severity:  Problem
Resolution:                    |   Keywords:
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Comment (by anonymous):

 I can see you're using LTO. That may be the source of the problem. There
 are several source files in Boost.Log which are compiled with different
 compiler flags. In particular, it's dump_avx2.cpp, which contains the
 failing function you seen in the compiler errors. To verify that try
 disabling LTO and rebuilding the library.

 I have no experience with GCC LTO, but from what I know I can't use all
 the flags on the linking stage since that would make the whole resulting
 binary AVX2-only instead of only just the optimized part in dump_avx2.cpp.
 I could try adding attributes to the particular functions in dump_avx2.cpp
 so that they contain the required compiler options. But really, this has
 to be done by the compiler since I already pass the options on the
 compilation stage.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/9766#comment:5>
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