From: Stefano Crocco <stefano.crocco@...>
Date: 2008-07-07T02:12:00+09:00
Subject: Re: mkmf isn't finding my shared object to link with

On Sunday 06 July 2008, Tristin Davis wrote:
> I have an extension I wrote which is actually just a wrapper for a C api.
> The directory structure looks like this.
> .
>
> |-- Makefile
> |-- extconf.rb
> |-- extconf.rb~
> |-- libmdc.so
> |-- mdc.h
> |-- metadata-backup.c~
> |-- metadata.c
> |-- metadata.c~
> |-- metadata.o
> |-- metadata.so
>
> `-- mkmf.log
>
> When I generate the makefile, it doesn't find libmdc.so.  How can I fix
> this?
>
> require 'mkmf'
>
> have_header("mdc.h")
> have_library('libmdc.so','MDOpenConnection')
>
> dir_config('metadata')
> create_makefile('metadata')
>
> When I run it, I get
>
> checking for mdc.h... yes
> checking for MDOpenConnection() in -llibmdc.so... no
> creating Makefile

I'm not sure, but I think you shouldn't put the lib prefix in the call to 
have_library:

have_library('mdc', 'MDOpenConnection')

I hope this helps

Stefano