Re: [Boost-bugs] [Boost C++ Libraries] #9704: b2: Compiler flavour has no flexibility for cross-compiling projects.

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #9704: b2: Compiler flavour has no flexibility for cross-compiling projects.
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2014-04-04 21:09:39

#9704: b2: Compiler flavour has no flexibility for cross-compiling projects.
--------------------------------+--------------------------------
  Reporter:  lukasz.forynski@…  |      Owner:  steven_watanabe
      Type:  Bugs               |     Status:  assigned
 Milestone:  To Be Determined   |  Component:  build
   Version:  Boost 1.54.0       |   Severity:  Problem
Resolution:                     |   Keywords:  boost build system
--------------------------------+--------------------------------

Comment (by steven_watanabe):

 Replying to [ticket:9704 lukasz.forynski@…]:
 >
 > {{{
 > import toolset ;
 >
 > if [ toolset.name ] == gcc
 > {
 >   if [ toolset.flavor ] == flav_1
 >   {
 >   }
 > }
 > <snip>
 > }}}
 >

 This is fundamentally impossible in Boost.Build.  The main reason being
 that there is no such thing as the value of a feature in a Jamfile.  See
 http://www.boost.org/boost-

 build2/doc/html/bbv2/faq.html#bbv2.faq.featurevalue

 You would need to write this using a conditional

 {{{
 import feature ;
 rule calculate-install-dir ( properties * )
 {
     local gcc-version = [ feature.get-values <toolset-gcc:version> :
 $(properties) ] ;
     return <location>../../release_$(gcc-version) ;
 }

 install copy_binaries_to_release
   : # target names
   :
     <conditional>@calculate-install-dir
   ;
 }}}

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/9704#comment:2>
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