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Date: Sat, 16 Aug 2025 09:37:13 -0700 (PDT)
X-X-Sender: jeremyd AT resin DOT csoft DOT net
To: ASSI <Stromeko AT nexgo DOT de>
cc: cygwin AT cygwin DOT com
Subject: Re: another possible setup bug: not accepting "provides" name in
 -P
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From: Jeremy Drake via Cygwin <cygwin AT cygwin DOT com>
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On Sat, 16 Aug 2025, ASSI via Cygwin wrote:

> Jeremy Drake via Cygwin writes:
> > I was trying to clean up my workflows now that llvm 20.1.8-2 is published,
> > and I came across another possible setup bug.  It seems that the -P option
> > doesn't accept a package name that is provided rather than being the
> > actual name of a pacakge.
> >
> > llvm20.1-devel is provided by llvm-devel 20.1.8-2, but passing that to -P
> > results in the message: Package 'libllvm20.1-devel' not found.  However,
> > libclang-devel 20.1.8-2 requires libllvm20.1-devel, and selecting that
> > version results in "Install libllvm-devel 20.1.8-2 (automatically added)",
> > so requires does respect provides.
>
> Sorry, but it seems you're misusing provides

Quite possibly, I'm still trying to figure things out ;)

> (and I'm not clear on
> whether there should be any dots in the names of provides, but I think
> it's best avoided).  Provides are meant to guide dependency resolution
> among a group of packages that belong together, not as an alias for the
> install package.  It's the installed base package that delivers a
> provide that ensures that the versions are compatible, so it does not
> make sense for each and every package to have their own versioned
> provide, which would imply that one could mix and match between say, lld
> and llvm-devel versions.

Regardless, BUILD_REQUIRES is documented to allow provides, and scallywag
passes BUILD_REQUIRES entries to setup -P, so there's a bug in there
somewhere.

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