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From: Vladimir Prus (ghost_at_[hidden])
Date: 2004-12-10 02:44:40

On Friday 10 December 2004 01:21, David Abrahams wrote:

> > or if you want to use an env.var.
> >
> >
> > BUILDDIR = [ modules.peek : ALL_LOCATE_TARGET ] ;
> > project my-project : : build-dir $(BUILDDIR) ;
> Well, thanks, but IMO this is bad. It should be an officially-supported
> command-line option for bjam. Projects shouldn't be expected to
> cooperate in choosing environment variables, and any project should be
> buildable from read-only media, including a project with dependencies on
> other projects also on read-only media.

I was thinking about this recently and almost decided that the approach Toon
has outlines is the right one. However, you're right that it's better to
have a standard name of an option.

The problem is this this:


lib my_lib : my_lib.cpp ..//some_other_project ;

If you run

bjam --build_dir=/tmp/foo

then my_lib is compiled to /tmp/foo/bin/....., but where
does ..//some_other_project go?

Related to this, I think it would be great to have "global build dir". Say, I
have 3 copies of Boost, and several other non-so-small projects. They are
built in different places, so it's not easy to delete all build products.

I'd like to have directive like:

global-build-dir /space/p2/build_dir ;

which will causes all projects to be build under /space/p2/build_dir, with
paths like


Maybe, this will solve the "build from read only medium" issue too (if global
build dir can be specified from command line).

- Volodya


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