Re: libtool libraries requiring other libraries

[Robert Boehne]

Steffen,

I would suggest asking questions about Libtool on a libtool mailing list.

That said - It looks to me like you're not *using* libtool to do your 
linking.
Libtool's la files contain all the dependencies that a library needs.
This is a big help when using static archives because they need
to have everything listed in the proper order on the link line.
If you add

LT_INIT

to configure.ac your problem should go away.

HTH,

Robert Boehne

On 07/16/13 09:56, Steffen Sledz wrote:
> Sorry, if this is a faq, but i didn't found a clear answer searching around.
>
> Given situation: We have a library called e.g. libfoo which uses e.g. mq_open 
> from librt. Than we have a program e.g. called progbar which requires libfoo 
> (and therefor also librt).
>
> Our current solution looks like this, but it does not work, because linking 
> progbar is missing the -lrt option.
>
> progbar/configure.ac:
> ---------------------> snip <---------------------
> ...
> AC_CHECK_LIB([rt], [mq_open], [], [ AC_MSG_ERROR([*** Could not find librt 
> ***]) ])
> ...
> if test -n "$with_libfoo_path" ; then
>        FOO_LDFLAGS="-L$with_libfoo_path/lib -lfoo"
>        FOO_CPPFLAGS="-I$with_libfoo_path/include"
> else
>        AC_CHECK_LIB([foo], [foo_init], [], [ AC_MSG_ERROR([*** Could not find 
> libfoo, use --with-libfoo-path option ***]) ], [-lrt])
> fi
> AC_SUBST(FOO_LDFLAGS)
> AC_SUBST(FOO_CPPFLAGS)
> ...
> ---------------------> snap <---------------------
>
> progbar/src/Makefile.am:
> ---------------------> snip <---------------------
> bin_PROGRAM = progbar
> ...
> progbar_CPPFLAGS = $(FOO_CPPFLAGS)
> progbar_LDFLAGS = $(FOO_LDFLAGS)
> ...
> ---------------------> snap <---------------------
>
> Where do we have to make which checks?
>
> Do we need a check for librt in the libfoo package?
>
> Do we have to mention the librt link option somewhere in the progbar package?
>
> Thx for any help,
> Steffen
>
> PS: FUP set to <address@hidden>