Re: -Wl,-rpath question

[Bruno Haible]

> Quite a few packages using autotools seem to have the correct -L,
> but no -Wl,-R. Is it up to libtool to know whether an associated
> -rpath is necessary for each -L? or is it something one has to
> somehow write in Makefile.am ?

It's something you have to add yourself to your Makefile.am, depending
on where the needed library is found, and also depending on whether
the user desires hardcoded rpaths or not.

You find an autoconf macro that determines the right linker flags
(including -Wl,-rpath when libtool is not used, or including -R when
libtool is used) in the autoconf-lib-link subpackage of GNU gettext 0.12.

For your case of libjpeg you would just add

  AC_LIB_LINKFLAGS([jpeg])

in configure.{in,ac} and then use @LIBJPEG@ or @LTLIBJPEG@ in your
Makefile.am. This macro invocation also adds the configuration options

  --with-libjpeg-prefix
  --disable-rpath

to the configure file, so the user can customize the behaviour.

Bruno