From: Jason Roelofs <jameskilton@...>
Date: 2009-12-18T23:38:25+09:00
Subject: Re: [ANN] rb++ / rbgccxml 0.9.1

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What you're running into is a general C++ compilation issue when you have
code in your header files. By default, rb++ writes out code in a
one-file-per-class format, along with another file that's the ruby extension
starting point. Your test.hpp file ends up getting included into multiple
files, and g++ doesn't like it when it sees a fully defined method multiple
times.

Two ways to deal with this:

1) Tell rb++ to write all code to single file:

  ext.writer_mode :single

2) Split your C++ code out:

test.hpp
  namespace T { void test(); }

test.cpp
  namespace T { void test() { ... } }

Jason

On Fri, Dec 18, 2009 at 9:02 AM, Thorsten Hater <th@tp1.rub.de> wrote:

> Hi,
>
> I seem to have something like a bug in rb++. For the case that I want to
> wrap a simple method
> the extension doesn't compile because of multiple definitions. The issue
> is somewhat tricky since
> when I have a previously compiled extension and merely extend the header
> file, it compiles fine.
> Here test case:
>
> wrapper.rb
> require 'rubygems'
> require 'rbplusplus'
>
> include RbPlusPlus
>
> Extension.new "test" do |ext|
>  ext.sources ["/home/thor/rb++/test.hpp"]
>
>  ext.module "Test" do |mod|
>    node = mod.namespace "T"
>  end
> end
>
> test.hpp
> #ifndef TEST
> #define TEST
>
> #include <iostream>
>
> namespace T
> {
>
>  void test()
>  {
>    std::cout << "i'm just sitting here" << std::endl;
>  }
>
> }
> #endif
>
> The error is encountered also if I have a class before the function test.
>
> Thorsten
>
>
> Jason Roelofs wrote:
> > What is rb++ / rbgccxml?
> >
> >   Rb++, rbgccxml, and rice compose a suite of tools that make wrapping
> C++
> > libraries into
> >   Ruby extensions as simple as possible. This is built as a replacement
> for
> > SWIG-Ruby.
> >
> > What's New
> >
> >   * Full 1.9 support through the entire stack!
> >   * MinGW / MSYS build support on Windows.
> >
> >   rb++:
> >     * Updated to work with the Rice::Director changes
> >     * Fixed a bug where rb++ wasn't using any superclass on classes with
> > multiple superclasses
> >     * Generated extension handles exceptions cleaner
> >
> >     * Various other small bug fixes and tweaks
> >
> >
> >   rbgccxml:
> >     * Switched parsing from libxml-ruby to nokogiri
> >     * Fixed crash on encountering <Union>, but no real handling of the
> type
> > yet.
> >     * Fixed a bug with older gcc versions on dealing with anonymous
> > enumerations
> >
> >
> > Project
> >
> >   Documentation: http://rbplusplus.rubyforge.org
> >
> >   rb++:     http://github.com/jameskilton/rbplusplus
> >   rbgccxml: http://github.com/jameskilton/rbgccxml
> >
> >
> > Installation
> >
> >   This single command will grab the whole stack needed for rb++ to work.
> >
> >     gem install rbplusplus
> >
> >   The stack includes four libraries: rb++, rbgccxml, gccxml_gem, and rice
> >
> >
> > rb++
> >
> >   Rb++ makes it almost trivially easy to create Ruby extensions for C++
> > library.
> >   In the simplest of cases, there is no need to ever touch C++,
> everything
> > is done
> >   in a very simple and clean Ruby API.
> >
> >
> >
> > rbgccxml
> >
> >   RbGCCXML allows one to easily parse out and query C / C++ code.
> >   This library uses GCC-XML to parse out the C / C++ code into XML, and
> then
> > nokogiri
> >   to parse and query that XML.
> >
> >
> >
> > gccxml_gem
> >
> >   GCC-XML (www.gccxml.org) is an application that takes takes the parse
> tree
> > of C / C++
> >   and constructs a very parsable and queryable XML file with all related
> > information.
> >
> >   This gem includes a binary build of GCC-XML for supported platforms,
> >   to make it trivially easy to install. Platforms currently supported
> are:
> >
> >     * Linux 32 & 64 bit
> >     * Mac OS X
> >     * Windows via MinGW / MSYS
> >
> >
> > Rice
> >
> >   The Ruby Interface for C++ Extensions, it provides a C++ API for
> working
> > with ruby. More information
> >   available at its project page:
> >
> >     http://rice.rubyforge.org
> >
> >
> > Notes
> >
> >   Released under the MIT licence.
> >
> >   For those familiar with py++ / pygccxml, the similarities are in
> function
> > only.
> >   Rb++ / rbgccxml were written from scratch to take advantage of the Ruby
> > language to it's fullest.
> >
> >   Bugs, patches, feature requests, et al should be posted to the
> > corresponding project's Issues page on github.
> >
> >
>
>
>

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