Re: Removing duplicate occurences from dependency_libs

[Alexandre Oliva <oliva lsd ic unicamp br>]

On May 20, 2001, Martin Baulig <martin home-of-linux org> wrote:

> Alexandre Oliva <oliva lsd ic unicamp br> writes:
>> On May 20, 2001, Martin Baulig <martin home-of-linux org> wrote:
>> 
>> > If you have a "complicated" dependency setup, this will slow down linking
>> > in a very extreme way (it is more than 5 times slower for me) because I get
>> > libraries like -lm or -ldl listed over 30 times in the dependency_libs.
>> 
>> > Is it possible to add an argument to libtool to get back the old behavior,
>> > for instance -unique-dependency-libs ?
>> 
>> Just make sure no library appears explicitly more than once in the
>> dependence list of any library or program, and you'll get exactly what
>> you want.

> This does not work.

> Imagine the following scenario:

>         liba.la         - depends on -lm
>         libb.la         - depends on -lm
>         libc.la         - depends on -la and -lb

> You'll get -l twice in libc.la.

That's why I wrote *explicitly*.  You shouldn't get -lm duplicated in
this case.  If you do, it's a bug.  You should only get it duplicated
if it appeared more than once in the dependence list of liba.la or
libb.la; if it appears only once it both of them, only the last one
should prevail.

-- 
Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer                  aoliva {cygnus com, redhat.com}
CS PhD student at IC-Unicamp        oliva {lsd ic unicamp br, gnu.org}
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