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

Subject: Re: [boost] Problem with debug Boost, Mac OS X and g++ 4.6
From: Christopher Jefferson (chris_at_[hidden])
Date: 2011-03-31 03:08:46

On 30 Mar 2011, at 23:48, John Wiegley wrote:

> 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

Did you build g++ with _GLIBCXX_FULLY_DYNAMIC_STRING? Or are you sure where it is picking up it's standard library from?

My suspicion is that you are hitting the (which you seem to know about) _GLIBCXX_DEBUG and std::string bug in Mac OS X. Unfortunately I don't have a good answer on how to avoid it, I have tried various workarounds, but I always seem to end up getting bitten in the end.

> 
> 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
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