Re: [Boost-bugs] [Boost C++ Libraries] #8778: Building boost.log fails due to failure in date_time_format_parser

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #8778: Building boost.log fails due to failure in date_time_format_parser
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2013-10-12 15:13:30

#8778: Building boost.log fails due to failure in date_time_format_parser
-------------------------------+---------------------
  Reporter:  benjamin@…        |      Owner:  hkaiser
      Type:  Bugs              |     Status:  new
 Milestone:  To Be Determined  |  Component:  spirit
   Version:  Boost 1.54.0      |   Severity:  Problem
Resolution:                    |   Keywords:
-------------------------------+---------------------
Changes (by andysem):

 * cc: Andrey.Semashev@… (added)
 * owner:  andysem => hkaiser
 * component:  log => spirit

Comment:

 I think the problem is in Boost.Spirit.Karma. Boost.Log uses
 karma::uint_generator< uint32_t >, but somehow absolute_value< long double
 > gets instantiated. Apparently, Boost.Math doesn't support long double on
 Cygwin (and defines BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS, which should
 be checked for by Boost.Spirit), which results in the build failure.

 I think, preliminary fix would be checking for
 BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS in Bost.Spirit and fallback to
 the generic code based on fabs. But it is not clear to me why
 absolute_value< long double > is used in the first place. Maybe this is a
 sign of a deeper problem. I'm reassigning this ticket to Boost.Spirit.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/8778#comment:2>
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