Undefined symbols( was: how to make multiple libs ?)

[Ionutz Borcoman]

Hi,

I discovered that the problem was actually with some global undefined 
symbols. The package is an old SCO program that I try to port to Linux. 
The original authors used a lot of extern variables. When I was linking 
statically, there was no problem, but now, with libtool and shared libs, 
 I get an error for every undefined extern variable from lib1, lib2 and 
lib3, even if these vars are not used in the functions I call in prog1 
or prog2.

So why is the ld complaining and how do I solve this ? In the present I 
declare locally all the undeclared vars, but this doesn't look too 
elegant to me.

TIA,

Ionutz

Ionutz Borcoman wrote:
> Hi,
>
> I have a package organized like this:
>
> top
>  |_ lib1
>  |_ lib2
>  |_ lib3
>  |_ prog1
>  |_ prog2
>
> lib2 uses on lib1 and prog1 uses lib2.
>
> How do I correctly build the lib2 and prog1 ?
>
> I have try this (but it doesn't work as I have expected):
>
> 1) In lib2/Makefile.am
>
> lib2_la_LIBADD = $(top_builddir)/lib1/lib1.la
>
> 2) In prog1/Makefile.am
>
> prog1_LDADD = $(top_builddir)/lib2/lib2.la
>
> Do I have to explicitly link with lib1.la,  too ?