Re: Adding the right flags to a program which dlopens

[Gary V. Vaughan]

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Stephane Bortzmeyer wrote:
| [Feel free to redirect to the proper mailing list if it is not a
| libtool problem, after all.]
|
| I have a program with binary plugins. It loads them by dlopen(3). I
| develop on Debian/Linux (where you need to pass -dl to the linker) and
| NetBSD (where you need nothing special). I use Autoconf, Automake and
| libtool.
|
| How to I set up the proper passing of flags to the linker?
|
| Since I have AC_LIBTOOL_DLOPEN in configure.ac, configure tests
| currently wether it needs -dl or not. How to retrieve the result of
| this test?
|
| Currently, I write in configure.ac:
|
| AC_SUBST(lt_cv_dlopen_libs)
|
| and in Makefile.am:
|
| address@hidden@
|
| lt_cv_dlopen_libs seems undocumented and I wonder if there is a better
| solution?

Arrange for your aclocal.m4 to include ltdl.m4, and then in configure.ac:

~  AC_LTDL_DLLIB
~  AC_SUBST([LIBADD_DL]) # probably not necessary for libtool >= 1.5

and in Makefile.am:

~  program_LDADD = @LIBADD_DL@

Beware the "Great Renaming" wherein, hopefully, libtool 1.6 will move all
macros into the LT_* and LTDL_* namespaces.  autoupdate is your friend.

Cheers,
        Gary.
- --
Gary V. Vaughan      ())_.  address@hidden,gnu.org}
Research Scientist   ( '/   http://tkd.kicks-ass.net
GNU Hacker           / )=   http://www.gnu.org/software/libtool
Technical Author   `(_~)_   http://sources.redhat.com/autobook
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