mkmf isn't finding my shared object to link with

[Tristin Davis]

[Note: parts of this message were removed to make it a legal post.]

I have an extension I wrote which is actually just a wrapper for a C api.
The directory structure looks like this.

 

[Stefano Crocco]

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

 

[Tristin Davis]

[Note: parts of this message were removed to make it a legal post.]

Thanks Stefano, that worked. Now I get this though.

LoadError: libmdc.so: cannot open shared object file: No such file or
directory - ./metadata.so
from ./metadata.so
from (irb):1

I tried setting LD_LIBRARY_PATH to include the directory, but that didn't
work.