[Development] Notes on "Qt Build Systems" @ QtCon 2016
annulen at yandex.ru
Tue Sep 20 21:24:23 CEST 2016
20.09.2016, 22:21, "Matthew Woehlke" <mwoehlke.floss at gmail.com>:
> On 2016-09-15 02:57, Oswald Buddenhagen wrote:
>> On Wed, Sep 14, 2016 at 12:05:15PM +0200, Stephen Kelly via Development wrote:
>>> I want to understand Qbs and what it can do with a dynamic build graph
>>> which CMake can't do.
>> there is no such thing, as after full expansion the graph has to be
>> static by definition (the output artifacts are expected to be
>> deterministic, after all).
> I don't think that's actually true; it just has to *halt*. That is, you
> can execute as many steps as you like that generate new build edges, as
> long as *at some point* you end up with a static graph.
> CMake necessarily imposes that you can run exactly one iteration, but
> I'm not aware of any theoretical reason you couldn't have an entire
> chain of targets each of which don't know their outputs (which are the
> inputs of the next in the chain) until you go to actually build them.
> For that matter, you can do that sort of thing with make, by having each
> target depend on the previous one, and generate a new Makefile that is
> used to build the next one.
More popular pattern: include generated makefile (e.g., depfile produced by GCC)
into "master" makefile
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