On Fri, Feb 12, 2021 at 12:24:02AM +0200, Peter Pentchev wrote: > On Thu, Feb 11, 2021 at 10:50:35PM +0200, Boian Bonev wrote: > > -----BEGIN PGP SIGNED MESSAGE----- > > Hash: SHA512 > > > > Hi All, > > > > While playing with glibc 2.33 (I made a couple of changes on the 2.31-9 > > and built it locally), I stumbled upon the following generated > > dependency in libnih1: > > > > $ apt info libnih1 > > Package: libnih1 > > Version: 1.0.3-11 > > Priority: optional > > Section: libs > > Source: libnih > > Maintainer: Debian QA Group <packa...@qa.debian.org> > > Installed-Size: 214 kB > > Depends: libc6 (>> 2.31), libc6 (<< 2.32) > > Homepage: https://launchpad.net/libnih > > Tag: role::shared-lib > > ... > > > > Looking into libnih source package didn't make it obvious for me what > > part of libnih requires this dependency. Can someone aware with that > > package shed some light? > > So... I just learned something new today, thanks! :) > > My first thought was "dpkg-shlibdeps and symbols files". So in short: > > - once upon a time, the library -dev packages came with a .shlibs file > that said "if you use this package to compile against the library, > you need to add these dependencies to your binary package" > > - this was... less than optimal in many cases, e.g. it was lacking > granularity, so sometimes it would introduce dependencies on > needlessly high versions when a much lower version of the same library > would suffice > > - the library symbols file mechanism was introduced; start at > https://wiki.debian.org/UsingSymbolsFiles > > https://www.debian.org/doc/debian-policy/ch-sharedlibs.html#the-symbols-system > > ...and hit me up (or, of course, feel free to ask on the list) if you > have any more questions about the symbols files and their use... > there was a time when I misled some people into thinking that I would > actually help with updating the library packaging guide (yeah, sorry > about that, everyone)
(and for the record, for others reading this: yes, of course I'm aware that the symbols file mechanism is not a panacea, that there are several major and a couple more minor cases when it breaks down or produces kind of less than optimal output itself; I did not mean to represent it as The Final Solution(tm)) G'luck, Peter -- Peter Pentchev r...@ringlet.net r...@debian.org p...@storpool.com PGP key: http://people.FreeBSD.org/~roam/roam.key.asc Key fingerprint 2EE7 A7A5 17FC 124C F115 C354 651E EFB0 2527 DF13
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