From: Vladimir Prus (ghost_at_[hidden])
Date: 2003-01-05 09:27:49
David Abrahams wrote:
> Hi Volodya,
> Every time I go to look at addressing BB4, I get confused.
> Needd to implement new version of the "flags" rule.
> Generators ids
> Where can I read about "generator IDs"?
Generator id is the first parameter to class generator constructors.
The idea is that whenever you create a new generate, you give it
an id via ctor. This was it's possible to refer to the generator
using more convenient name than "object_at_....".
> will be used to denote generator, to which flags apply.
> What does it mean that flags will apply to a generator? Is the idea
> simply to limit the "on target" variable assignments to the products
> of that generator?
Kind of. Generator id has a second function. It names a rule which is
used to actually set up build action. E.g. gcc.link generator has
associated gcc.link rule. (In fact, gcc.link *rule* is empty, there's
only gcc.link *action*, but that's detail).
I meant that if you say that flags apply to gcc.link, that the variable
assingment will be only done for that rule, but not for gcc.compile, for example.
> Before calling user-supplied rule,
> What user-supplied rule? The one which implements the generator's
> generator will set target variables accordingly.
> Also, I don't know how to reach this link mentioned in BB4 anymore:
Hmm... I get to it simply by clicking in Mozilla... Can Outlook open
news article by URL?
P.S. BTW, there's now a long row of holidays in Russia. I had a week of them
already, and there will be two more: 6th and 7th. I'll be online as usual
after that (and will resume Boost.Build hacking as well).
Boost-Build list run by bdawes at acm.org, david.abrahams at rcn.com, gregod at cs.rpi.edu, cpdaniel at pacbell.net, john at johnmaddock.co.uk