[Boost-build] How to enhance install to register stage targets but not run them?

From: Eric Woodruff (eric.woodruff_at_[hidden])
Date: 2008-08-01 11:04:51

Hi,

I'm working on a set of Jam rules to build an RPM. I'm using stage.jam 
to install files into a buildroot directory, and a scanner to analyze 
the dependencies of the RPM spec file. The goal of the build system is 
to only build dependencies of an RPM when one is being built. At this 
point everything seems to be working fine except for the behavior of the 
install rule.

When install is run, it builds all of its sources and runs the virtual 
targets that install the sources into <location>. The behavior I need is 
that files not listed in the RPM spec file should not be built or 
staged. So I'm looking for a way to extend install () or modify it with 
a build requirement such that install () doesn't actually construct 
anything, but instead only registers the virtual targets for each 
element that has the potential to be staged. This way the stage targets 
can still be found as dependencies of the RPM spec file, and are only 
run in that case rather than unconditionally.

Does anyone have any advice on how this might be enhanced? I've been 
looking at the install-target-class, but the solution hasn't made itself 
apparent to me yet.

Thanks,

Eric