big diff for darwin

[Peter O'Gorman]

Okay, my copyright assignment has gone through, here is my latest patch.
TODO: All the darwin code expects apple gcc, but doesn't check for it, 
add the checks.

This passes all tests (well, fortran tests need a patch to autoconf's 
fortran.m4, but I need to look at that more closely before submitting 
it anywhere).

Here is the Changelog entry:
2003-03-19  Peter O'Gorman  <address@hidden>
        
        * ltmain.in: Always use $echo not echo for consistency.
        Changes for darwin building. Warn if linking against libs linked
        with -module. Use module_cmds if available and building a module,
        move convenience double lib check,
        * libltdl/ltdl.c: ltdl support for darwin (first blush)
        * libltdl/README: note that darwin is supported
        * ltdl.m4: Changes for darwin, and for new shrext
        * libtool.m4: Changed the way darwin builds stuff (make check passes)
        added module_cmds, module_expsym_cmds and hardcode_automatic and put
        them in the libtool script. check for zsh's removal of escapes. Allow
        libraries to be stripped on darwin.
        * TODO: Remove the todo about zsh's removal of excapes. note that zsh
        echo works perfectly well, eval is screwed up. Seems to be fixed in
        latest zsh.
        * THANKS: added self :)
        * configure.ac: At least my autoconf reports $F77 as '' if it isn't
        installed, check for this.
        * f77demo/configure.ac: Use config.h or it doesn't work.

darwin.3.diff.gz
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