Re: [Boost-build] Upgrade from Jam-Classic to Boost.Jam

From: Marc Boris Dürner (BDuerner_at_[hidden])
Date: 2006-04-21 12:43:55

Hi,

I successfully used bjam to build a previous jam project by renaming bjam to
xjam. Except for one rule (FDefines) and using the right JAM_TOOLSET no
changes were neccesary. It would be nice if bjam could be kept compatible to
classic-jam in the future.

I am now trying the enhanced syntax of bjam like module etc. IT seems that I
can declare modules but not call rules in it from the global space, even
when qualified.

Example:
module X 
{
        rule greet ( x ) { Echo x ; }
}

module Y 
{
        rule salute { greet ; }
}

# this deoes not work, but is an unknown rule
X.greet ;

Any ideas why? 
Surprisingly, when I IMPORT X : greet : : greet ; then I can call greet like
a global rule.

regards,
Marc

> > Is Boost.Jam backwards compatible with regular jam? 
> 
> Not exactly.  They forked at some point long ago.
> 
> > I have a jam based project here that I want to convert to
> > Boost.Jam. When I use bjam to build the old jam project I get an
> > error message that boost-build.jam and bootstrap.jam are missing. I
> > created an empty bootstrap.jam and cretaed a boost-build.jam that
> > contains only the boost-build rule:
> >
> > boost-build ;
> >
> > This seems to satisfy bjam, however my Jamrules/Jamfiles from the
> previous
> > jam project are not used. What else do I need to add?
> 
> I don't know what it would take.  We are probably not going to support
> the use of Boost.Jam as a pure build engine, without the Boost.Build
> v2 build system, but if you want to try it on your own, it will probably
> work if you just rename "bjam" to something else (e.g. "jam") and
> don't have BOOST_ROOT set in your environment.  See the Jambase file
> in the Boost.Jam source for the reasons why that might work for you.

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