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List:       boost-build
Subject:    Re: [Boost-build] [Boost-users] [System] Link issues using BOOST_ERROR_CODE_HEADER_ONLY
From:       "Vicente J. Botet Escriba" <vicente.botet () wanadoo ! fr>
Date:       2015-02-07 7:30:24
Message-ID: 54D5BF10.3020103 () wanadoo ! fr
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Le 06/02/15 20:36, Jonathan Jones a =E9crit :
> Hello,

Hi, adding the Boost build list.
>
> We're in the process of upgrading from Boost 1.49 to Boost 1.56.
>
> As part of this upgrade, we've noticed the linkage requirements for using
> the "system" library are much more strict in 1.56.  We are getting linker
> errors like the following across dozens of our libraries:
>
>      boost/system/error_code.hpp: undefined reference to
> `boost::system::generic_category()'
>      boost/system/error_code.hpp: undefined reference to
> `boost::system::system_category()'
>
>
> We decided to fix these by defining the macro BOOST_ERROR_CODE_HEADER_ONLY
> according to this link:
>
>      =

> http://www.boost.org/doc/libs/1_56_0/libs/system/doc/reference.html#Heade=
r-
> error_code
>
>
> However, when building Boost itself with this macro defined, we're
> encountering several problems:
> 1) Some Boost libraries (chrono, filesystem, random) that use the
>     "system" library no longer link, as if they are still expecting
>     the library to be present.  Note that some libraries, like thread,
>     that use "system", link fine without the shared library being present.
> 2) We get multiple definitions of "boost::system::throws"
>
> Any thoughts on how to resolve these?  Google search has not turned up any
> bugs that I can find.
>
>
on what concerns chrono and thread libraries, could you try the following
* in libs/chrono/build/Jamfile.v2  change the comments

         <library>/boost/system//boost_system
         #<define>BOOST_ERROR_CODE_HEADER_ONLY

by

         #<library>/boost/system//boost_system
         <define>BOOST_ERROR_CODE_HEADER_ONLY

* in libs/thread/build/Jamfile.v2  change

       <library>/boost/system//boost_system

by

         #<library>/boost/system//boost_system
         <define>BOOST_ERROR_CODE_HEADER_ONLY

Note to the Boost Build ML. What is the best way to solve this issue? I =

suspect that we need a header_only feature in Boost.System and that the =

the other libraries must be build in function of this feature.

Best,
Vicente

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