Since version 1.2c, libtool has re-introduced the ability to do inter-library dependency on some platforms, thanks to a patch by Toshio Kuratomi email@example.com. Here's a shortened version of the message that contained his patch:
The basic architecture is this: in libtool.m4, the person who writes libtool makes sure ‘$deplibs’ is included in ‘$archive_cmds’ somewhere and also sets the variable ‘$deplibs_check_method’, and maybe ‘$file_magic_cmd’ when ‘deplibs_check_method’ is file_magic.
‘deplibs_check_method’ can be one of five things:
file_magic_test_fileis set by libtool.m4, it is used as an argument to ‘$file_magic_cmd’ in order to verify whether the regular expression matches its output, and warn the user otherwise.
ldd. It is currently unused, and will probably be dropped in the future.
Then in ltmain.in we have the real workhorse: a little initialization and postprocessing (to setup/release variables for use with eval echo libname_spec etc.) and a case statement that decides the method that is being used. This is the real code... I wish I could condense it a little more, but I don't think I can without function calls. I've mostly optimized it (moved things out of loops, etc.) but there is probably some fat left. I thought I should stop while I was ahead, work on whatever bugs you discover, etc. before thinking about more than obvious optimizations.