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Re: transitive shared library dependencies and installation

From: wferi
Subject: Re: transitive shared library dependencies and installation
Date: Sat, 04 Jan 2020 16:28:25 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux)

Roumen Petrov <address@hidden> writes:

> address@hidden wrote:
>> I'm experimenting with the attached skeleton project on a Debian buster
>> system (autoconf 2.69-11, automake 1:1.16.1-4 and libtool 2.4.6-9):
> [SNIP]
>> /usr/bin/ld: cannot find -lb
>> collect2: error: ld returned 1 exit status
>> libtool:   error: error: relink 'a/' with the above command before 
>> installing it
>> make[1]: *** [Makefile:446: install-libLTLIBRARIES] Error 1
>> make[1]: Leaving directory '/home/wferi/ha/pacemaker/translib'
>> make: *** [Makefile:798: install-am] Error 2
> Libtool does not change "order" :(. Automake just uses project rules.
> Let view
> ...
> install-exec-am: install-binPROGRAMS install-libLTLIBRARIES
> ...
> install-binPROGRAMS: install-libLTLIBRARIES
> ...
> install-libLTLIBRARIES: $(lib_LTLIBRARIES)
> ...
> Above dependency explain all - lib_LTLIBRARIES is project (sample)
> specific. Project should ensure order.

Fair enogh, but my point (which I didn't really emphasize) is that
installation could work in any order, if relinking didn't depend on
already installed libraries.  It's even necessary for mutually dependent

>> and use it from liba, linking the final binary fails:
>> $ make
>> [...]
>> /bin/bash ./libtool  --tag=CC   --mode=link gcc  -g -O2 -avoid-version  -o 
>> translib translib.o a/
>> libtool: link: gcc -g -O2 -o .libs/translib translib.o  a/.libs/ 
>> -Wl,-rpath -Wl,/tmp/translib/lib
>> /usr/bin/ld: a/.libs/ undefined reference to `b2'
>> As I understand it, the -rpath linker option on the above command makes
>> a/.libs/ use the already installed (old) version of libb, which
>> lacks the b2 symbol.  What's the solution here?  Why isn't that -rpath
>> option "delayed" until the relinking phase?
> Not reproducible with FSF release.

Could you please share your link command?  Does you system use the new
dynamic tags (DT_RUNPATH instead of DT_RPATH)?

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