[boost] Problem with debug Boost, Mac OS X and g++ 4.6

Subject: [boost] Problem with debug Boost, Mac OS X and g++ 4.6
From: John Wiegley (johnw_at_[hidden])
Date: 2011-03-30 18:48:09

I'm not sure yet whether this is a Boost issue, or a g++ 4.6 issue.  I've
compiled Boost 1.46.1 on Mac OS X using g++ 4.6 and these build options:

  sh bootstrap.sh && ./bjam debug \
      --toolset=darwin --build-type=complete --layout=versioned \
      define=_GLIBCXX_FULLY_DYNAMIC_STRING=1 define=_GLIBCXX_DEBUG=1 \
      install

Then I build and execute the following example code:

  #include <boost/regex.hpp>
  #include <string>
  
  int main(int argc, char *argv[]) {
    boost::regex expr("foo.*bar");
    return boost::regex_search(std::string(argv[1]), expr) ? 0 : 1;
  }

with this compile/link command:

  g++-mp-4.6 -D_GLIBCXX_FULLY_DYNAMIC_STRING=1 -D_GLIBCXX_DEBUG=1 \
    -g -o regex regex.cc -lboost_regex-xgcc46-d-1_46_1

and the result is:

  terminate called after throwing an instance of 'std::bad_cast'
    what():  std::bad_cast

This is happening in boost::re_detail::cpp_regex_traits_base<char>::imbue, on
line cpp_regex_traits.hpp:218.

The same everything, using g++ 4.5, works fine, so maybe this is a g++ 4.6
bug?  I seem to recall having seen this problem before, due to mismatching a
debug Boost with a non-debug client app, or something similar.  But I've have
verified that my client app is using the same flags that I build Boost with.

Has anyone run into this?  Do I need to take this bug to the g++ folks?  Any
pointers, ideas?

Thanks,
  John