On Wed, 2012-08-01 at 00:21 -0700, Adam Williamson wrote:
> On Wed, 2012-08-01 at 02:17 -0400, Tom Lane wrote:
> > I have been working for the better part of a year on moving Fedora off
> > of libpng's obsolete 1.2.x release series and onto the current 1.5.x
> > series. We are practically there now, and I had hoped to drop libpng
> > 1.2 from the distribution before the F18 branch. However, I find that
> > redhat-lsb-desktop still has a dependency on 1.2, and it's not even
> > because that package contains any PNG-using code; rather, there's a
> > manually inserted version-specific dependency in the specfile:
> >
> > %ifarch %{ix86}
> > Requires: libpng12.so.0
> > %endif
> > %ifarch x86_64
> > Requires: libpng12.so.0()(64bit)
> > %endif
> >
> > This is unlike that specfile's treatment of any other library
> > it requires. I have been told, at
> > https://bugzilla.redhat.com/show_bug.cgi?id=835777#c8
> > that the LSB standard requires libpng 1.2, but without any supporting
> > evidence. I looked at the underlying ISO documents and don't see any
> > requirement for libpng at all, let alone 1.2 in particular. I am
> > doubtful that every other Linux distro is maintaining this long-obsolete
> > libpng version, too.
> >
> > I would like to know how to proceed here. "You should keep libpng 1.2
> > around indefinitely, on the basis of no evidence" is not an answer
> > I intend to accept.
>
> A very quick search returns this:
>
> http://refspecs.linuxbase.org/LSB_4.1.0/LSB-Desktop-generic/LSB-Desktop-generic/libpng.html
>
> in the 'desktop' section of LSB 4.1. I'm looking at it more closely now.
Well, that's really it. The format of LSB is a bit odd to a lay reader,
but AFAICT, it really does mean: to be technically in compliance with
LSB-desktop, you need to ship a libpng12.so.0 which provides the listed
functions. End of story. I don't see a workaround.
See
http://lists.linuxfoundation.org/pipermail/lsb-infrastructure/2012-June/004006.html for e.g., for confirmation that it does mean what it seems to mean - that seems like a 'real world' (and relatively recent) case where someone says, yup, you need to ship a library called libpng12.so.0 with the right symbols in it.
--
Adam Williamson
Fedora QA Community Monkey
IRC: adamw | Twitter: AdamW_Fedora | identi.ca: adamwfedora
http://www.happyassassin.net
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