[boost] [math] long double autoconfiguration

Subject: [boost] [math] long double autoconfiguration
From: Vladimir Prus (ghost_at_[hidden])
Date: 2010-02-24 07:31:15

Hi,

at present, Boost.Math library always tries to compile long long versions
of the function, unless explicit --disable-long-long is passed by the user.
I have just checked in a patch that attempt to automatically determine if
long long is available. Attached is a sample output of "bjam --with-math"
build.

The detection is done by compiling new file named 
libs/math/src/long_double_check.cpp -- if it compiles, it is assumed
long double works. Unfortunately, I don't really know what kind
of long double support Boost.Math needs. John, Paul, could either of
you add some more content to that file?

This change an SVN version of bjam as of today. If you use an older
version, nothing should break, but no auto-detection will be performed.
Also, if you need to look at compiler messages produced when compiling
the test file, look at bin.v2/config.log

Thanks,

--
Vladimir Prus
http://vladimir_prus.blogspot.com
Boost.Build: http://boost.org/boost-build2

Building the Boost C++ Libraries.

Configuration checks summary

    - long double support      : yes

Component configuration:

    - date_time                : not building
    - filesystem               : not building
    - graph                    : not building
    - graph_parallel           : not building
    - iostreams                : not building
    - math                     : building
    - mpi                      : not building
    - program_options          : not building
    - python                   : not building
    - regex                    : not building
    - serialization            : not building
    - signals                  : not building
    - system                   : not building
    - test                     : not building
    - thread                   : not building
    - wave                     : not building

...patience...
...found 1584 targets...

The Boost C++ Libraries were successfully built!
          
The following directory should be added to compiler include paths:
          
    /home/ghost/Work/Boost/boost-svn
      
The following directory should be added to linker library paths:
      
    /home/ghost/Work/Boost/boost-svn/stage/lib