[Boost-build] Issue in glob rule when invoked in <conditional>.

Subject: [Boost-build] Issue in glob rule when invoked in <conditional>.
From: dimak (dvb.kharkov_at_[hidden])
Date: 2012-07-23 16:49:26

Hi everybody,

I am replicating here the issue definition I posted at Boost track tickets,
*Ticket #7163* (https://svn.boost.org/trac/boost/ticket/7163) attached with
issue appearance example. 

*Description of the bug:*
 When we use glob rule inside conditional in dependency target, it makes
 "globbing" not inside directory of dependency project, but inside
 dependent one. To reproduce, take example/libraries from boost build
 repository, amend util/foo/jamfile to introduce <conditional>:

 >>>
 rule print-my-sources ( properties * )
 {
     ECHO My sources: ;
     ECHO [ glob *.cpp ] ;
 }

 project
     : usage-requirements <include>include ;

 lib bar : bar.cpp : <conditional>@print-my-sources ;
 <<<

 Finally, build from jamroot.jam level and see the output:
 My sources:
 app.cpp
 My sources:
 app.cpp

 We expected to see "bar.cpp", while it seems that context was not switched
 from dependent "app" to dependency "util/foo", and thus we got "app.cpp".

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