On Sun, Jan 29, 2023 at 12:03 AM Zbigniew Jędrzejewski-Szmek
<zbys...@in.waw.pl> wrote:
>
> On Sat, Jan 28, 2023 at 01:49:17PM -0800, Kevin Fenzi wrote:
> > On Sat, Jan 28, 2023 at 09:03:35PM +0000, Zbigniew Jędrzejewski-Szmek wrote:
> > >
> > > This is indeed a shortcoming in the rpm symbol dependency generation 
> > > scheme.
> >
> > Is it though? I'm probibly reading this too quickly and missing
> > something, but isn't the underlying problem here that nghttp2 changed
> > abi and didn't change soname? If they had, soup would have kept the
> > older version around, or asked to upgrade both libsoup and libnghttp2?
>
> No. libnghttp2 added one symbol, and (correctly, i.e. following the usual
> practice), it changed the suffix from .so.14.23.0 to .so.14.24.1.  (The last
> number is bumped when the implementation of existing symbols changes, the 
> middle
> one when when new symbols are added, and the first one when an incompatible
> change happens, i.e. symbols are removed or changed incompatibly. Lower 
> numbers
> are reset to zero whenever a higher one changes.)  The SOVERSION corresponds 
> to
> the major number and does not change in the case under discussion.
>
> As Gordon wrote, our rpm dependency generation logic does not care about the
> minor or patch numbers.

If I understand things correctly, this is not entirely true. RPM
generates a dependency for the soname / soversion, and some projects
include not only X, but all of X.Y.Z in that, which RPM will happily
generate Provides / Requires for (whether that's a nice thing to do
for an upstream project or whether that's a bug in their build systems
I leave as an exercise to the reader).

Fabio
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