Re: [Qbs] How to download and uncompress files with Qbs directly?

[Richard Weickelt]

>> Another automated and platform-independent library interface would be Conan
>> or vcpgkg. Have you searched for packages on bintray?
>> 
> these are some of the services that would need wrapping.

Why would you wrap these tools with Qbs and not use them side-by-side or - the 
other way round - use them as a wrapper for Qbs? It is my understanding that 
configuration/dependency/package management sits on top of build automation. 
Conan provides a recipe containing versions and configuration options for each 
dependency. It downloads all dependencies and generates something that can be 
consumed by your build system. In case of Qbs, see 
https://docs.conan.io/en/latest/integrations/build_system/qbs.html. That 
defines a sharp boundary between build automation and 
configuration/dependency/package management. I don't say that Conan is 
particularly beautiful, but I think it's a reasonable approach.

I haven't used vcpkg. Is it different?

>> If all that is not an option, then you might implement your own download &
>> install solution.
>> 
> i would recommend that "your own" be something contributable upstream,
> to get https://bugreports.qt.io/browse/QBS-62 resolved.
> 
> note that a key feature for configuration management is the ability to
> pin the sources and versions of modules, which is why the "grown-ups"
> from the java world (at least maven and bazel, and i presume also
> gradle) support it. conversely, linux distributors *hate* it - they want
> abstract package names and ranges of acceptable versions, based on
> binary compatibility promises. a good implementation would permit strict
> and relaxed operation with the same project files, and per-module
> overrides from the outside to support selective unbundling (see also
> QBS-61).

Given the current manpower behind Qbs, I have serious doubts that this is going 
to happen any time soon.

Richard
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Re: [Qbs] How to download and uncompress files with Qbs directly?

[Oswald Buddenhagen]

On Mon, Aug 05, 2019 at 08:25:35AM +0200, Richard Weickelt wrote:
> > Does Qbs support downloading and uncompressing files directly?
> 
> Not directly, because it is a build automation tool and not a package
> manager.
> 
that's not an argument at all. "support" often enough means "call
appropriate tools".

> > For example, I need to use Eigen 3.3.7
> >  in my project, and
> > install it in the build folders of my projects. How to achieve my goal?
> 
> If you have a pkg-config file for Your library, then Qbs can generate a
> module on-the-fly. See https://doc.qt.io/qbs/module-providers.html
> 
already locally present packages are not the task at hand.

> Another automated and platform-independent library interface would be Conan
> or vpgkg. Have you searched for packages on bintray?
> 
these are some of the services that would need wrapping.

> If all that is not an option, then you might implement your own download &
> install solution.
> 
i would recommend that "your own" be something contributable upstream,
to get https://bugreports.qt.io/browse/QBS-62 resolved.

note that a key feature for configuration management is the ability to
pin the sources and versions of modules, which is why the "grown-ups"
from the java world (at least maven and bazel, and i presume also
gradle) support it. conversely, linux distributors *hate* it - they want
abstract package names and ranges of acceptable versions, based on
binary compatibility promises. a good implementation would permit strict
and relaxed operation with the same project files, and per-module
overrides from the outside to support selective unbundling (see also
QBS-61).

> You could potentially abuse Qbs probes for this.
>
i suspect the module provider framework would be a better basis.

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