Re: [Boost-build] projects and usage requirements

From: Ilya Sokolov (fal_delivery_at_[hidden])
Date: 2006-05-05 06:16:51

Emil Dotchevski wrote:
  > Going through the boost-build documentation didn't help so I decided 
to look
> at some jamfile.v2 files in boost. I'm puzzled by the content of jamfile.v2 
> for boost.thread:
> 
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> import os ;
> 
> if [ os.name ] = NT
> {
>     reqts = <link>shared:<define>BOOST_THREAD_BUILD_DLL=1 ;
> }
> else
> {
>     # Declare the uses system library
>     lib pthread : : <name>pthread ;
>     usage = <library>pthread ;
> }
> 
> project boost/thread
>     : source-location ../src
>     : usage-requirements $(usage)
>     : requirements $(reqts)  <threading>multi
>     : default-build <threading>multi
>     ;
> 
> CPP_SOURCES = condition mutex recursive_mutex thread xtime once
>                   exceptions barrier tss tss_hooks tss_dll tss_pe ;
> 
> lib boost_thread
>    : $(CPP_SOURCES).cpp
>    ;
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> 
> Ideally I want any of my projects that ends up linking boost_thread to have 
> been built with <threading>multi without me having to specify it explicityl 
> in my requirements. But it doesn't seem to work.

i dont know why

 > project boost/thread
 >     : source-location ../src
 >     : usage-requirements $(usage)

is not

project boost/thread
      : source-location ../src
      : usage-requirements $(usage) <threading>multi

in boost/libs/thread/build/Jamfile.v2, it seems like an error. But you 
can create an alias (see below) and use it your own code

alias boost-thread-multi
   : # source
     /boost/thread
   : # requirements
   : # usage-requirements
     <threading>multi
   ;