From: james.d.masters@...
Date: 2007-10-25T05:20:02+09:00
Subject: Help with adding header files for 'mkmf' - new to Swig/mkmf

Hi,

I'm trying to extend a simple function from a large C++ API library
for Ruby (OpenAccess).  Ultimately I'd like to add functionality over
time; however, I want to get a simple test case up and running as a
proof-of-concept.  I believe the problem is properly pointing to the
large C++ library.  Let me begin with the problem seen (after using
Swig and extconf.rb):

irb(main):001:0> require 'libtest'
LoadError: ./libtest.so: undefined symbol:
_ZNK12OpenAccess_46oaFile6existsEv - ./libtest.so
        from ./libtest.so
        from (irb):1

In my libtest.cpp file I have:

#include "oaDesignDB.h"

And in my extconf.rb file:

require 'mkmf'
$libs = append_library($libs, "supc++")

# This does not seem to add the path to the "-I" option in the make
file
# even though the header is found.
find_header('oaDesignDB.h', '/path/to/the/header')

# And this does not work also even though $INCFLAGS has a value before
# as "-I$(topdir)" and with the added path afterwards... it just
doesn't get
# into the make file for some reason
# $INCFLAGS += " -I#{path}"

create_makefile('libtest_wrap')