[C++-sig] A very strange behaviour of Boost (Mingw, gcc 4.5)

Jérôme Laheurte fraca7 at free.fr
Wed Jun 15 12:46:11 CEST 2011

On 06/10/2011 07:47 PM, Niall Douglas wrote:

>>> Or you could stick with an older version of Mingw and wait till
>>> someone else fixes the problem. Or use MSVC.
>> Not really an option; GCC 4 gave us a factor 3 performance improvement
>> over GCC 3, which we really need, and we're not really MSVC people.
> Ah that's a useful clue - I patched symbol visibility into what
> became GCC v4.0. I bet what's happened is that the PE outputting GCC
> doesn't have support for this new feature, or it's been borked.
> BTW MSVC is little different to GCC when used via the command line
> e.g. using Boost Jam, Makefiles or scons. It's also free of cost via
> Visual Studio Express.

I guess the simplest workaround would be VS. We even have licences for 
VS 2008 because we use it for other .NET stuff, so it would be 
relatively painless. I'm still gonna take a few days to try to get a 
minimal case.

>>> BTW, debugging exception throws is a royal PITA. There ought to be
>>> some debug code in the GCC runtime if I remember, you could try
>>> turning that on and it will print each stage of what it does when you
>>> throw and/or rethrow an exception.
>> OK Thanks for all the tips. Basically, this is not a Boost issue so I'll
>> have to follow the GCC bug track :)
> Last time I was involved with GCC the PE backend was definitely low
> priority. I hope it's changed since, but since Visual Studio became
> free of charge a lot of fire has vanished from PE producing GCC.

OK. Thanks for the tips.

Jérôme Laheurte

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