From: Torsten Robitzki <lists@...>
Date: 2012-06-29T20:24:45+09:00
Subject: C++ extension using boost

Hello,
I'm trying to create a ruby extension with a library that uses boost.
This little example

#include <boost/regex.hpp>

extern "C" void Init_bayeux()
{
    boost::regex
expression("^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\\?([^#]*))?(#(.*))?");
}

results in a std::bad_cast exception being thrown, when loaded into the
ruby interpreter. I used the mac port installation of the gcc to build
the extension and installed ruby via rvm.

ruby -v
ruby 1.9.2p320 (2012-04-20 revision 35421) [x86_64-darwin10.8.0]

gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/opt/local/libexec/gcc/x86_64-apple-darwin10/4.5.2/lto-wrapper
Target: x86_64-apple-darwin10
Configured with: ../gcc-4.5.2/configure --prefix=/opt/local
--build=x86_64-apple-darwin10
--enable-languages=c,c++,objc,obj-c++,fortran,java
--libdir=/opt/local/lib/gcc45 --includedir=/opt/local/include/gcc45
--infodir=/opt/local/share/info --mandir=/opt/local/share/man
--datarootdir=/opt/local/share/gcc-4.5 --with-local-prefix=/opt/local
--with-system-zlib --disable-nls --program-suffix=-mp-4.5
--with-gxx-include-dir=/opt/local/include/gcc45/c++/
--with-gmp=/opt/local --with-mpfr=/opt/local --with-mpc=/opt/local
--enable-stage1-checking --disable-multilib
--enable-fully-dynamic-string
Thread model: posix
gcc version 4.5.2 (GCC)

I elaborated already on the issue (see
http://stackoverflow.com/questions/11224096/unable-to-create-a-c-ruby-extension
for details) but found no way to build a shared library, that links to
boost and can be successfully loaded by the ruby interpreter.

Is there someone out who was able to build a ruby extension, that uses
boost? Any help and pointers are highly appreciated.

best regards
Torsten

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