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Re: [SG15] RFC: Requirements to consume a prebuilt library from arbitrary build systems

From: Bret Brown <mail_at_[hidden]>
Date: Fri, 29 Oct 2021 13:30:30 -0600
For what it's worth, we translate from pkg-config to a proper transitive CMake model at configuration time. We could do other configuration time things if context is the problem.

Yeah, it's fair to say that translation from a context-free pkg-config file to something else would be challenging without making some assumptions. But pkg-config files often make dramatic assumptions already. Like implying system library linkage and search paths, implying language runtimes, use of non portable flags, etc. I expect any solution we come up with will require some in intentional adoption on the part of some package managers.


On Fri, Oct 29, 2021, at 11:31 AM, Matthew Woehlke via SG15 wrote:
> On 28/10/2021 10.40, Daniel Ruoso via SG15 wrote:
> > On Wed, Oct 27, 2021, 22:32 Boris Kolpackov wrote:
> >> A build system that wants to support system-installed libraries on Linux
> >> will need to support pkg-config. This means that if this effort results in
> >> a new format (which I believe where this is heading), such a build system
> >> will now need to support both pkg-config and this new format.
> People, presumably involved in pkg-config, keep saying that, but it
> seems no one wants to do the work. I'm still waiting to see something
> using pkg-config that satisfies even CMake's more basic requirements
> without jumping through hoops.
> Hint: *full path to libraries*.
> > pkg-config is a strict subset of what we're talking about here, so it
> > should be possible to mechanically convert a new format into a pc file
> > (with the subset supported by it) and to generate the file in the new
> > format with all the data that could be extracted from the pc file (which
> > does mean we need it to support proving only the minimal data that exists
> > in the pc file).
> >
> > I think the outcome is that it's a requirement that it should be trivial to
> > convert the information on any new format to and from existing formats.
> I think that is doomed to fail. Pkg-config, as people expect it to work,
> is a fairly impoverished format (not too surprising considering its
> age). Converting *to* pkg-config ought to be do-able. Converting *from*
> pkg-config, especially from the sorts of pkg-config files that currently
> exist, is a much harder proposition. (For starters, you're doomed if you
> don't have access to the package's entire file listing while trying to
> perform the conversion.)
> --
> Matthew
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Received on 2021-10-29 14:30:55