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

[Niall Douglas]

Might this be a symbol visibility problem?

Niall


On 10 Jun 2011 at 14:16, Jérôme Laheurte wrote:

> On 06/07/2011 09:59 AM, Lars Viklund wrote:
> 
> > On Tue, Jun 07, 2011 at 09:40:25AM +0200, Jérôme Laheurte wrote:
> >> Hello. I already asked this on StackOverflow but it doesn't seem to
> >> inspire many people. I managed to reduce my problem to a trivial
> >> extension module:
> >
> >> On Windows XP SP3, if I build Boost 1.46.1 and then this extension with
> >> GCC 3.4.5 from an older version of Mingw, everything behaves as expected:
> >
> >> Now if I rebuild both Boost and the module using a newer Mingw, with GCC
> >> 4.5.2, this happens:
> >
> >> Any hint would be greatly appreciated.
> >
> > Typically, you need to use the same major flavor of toolchain to build
> > Boost.Python and your extension as was used to build your Python.
> >
> > If the runtimes (and exception handling) differ, you'll get ODR
> > violations on things like FILE* and error handling.
> >
> > What you're observing there is probably console output crashing when an
> > error is printed. If the runtimes have different ideas of what
> > constitutes a FILE* (which output is done through), you blow up good.
> > This also includes using static runtimes to some extent.
> 
> Alas, this does not seem to be the case. I managed to rebuild Python 
> with GCC 4.5 after some minor modifications of the interpreter code, 
> then rebuilt boost and my extension. The same thing happens (except that 
> the call stack is more detailed since the "upper" layers now have GCC 
> debugging symbols).
> 
> Besides, if I replace throw_error_already_set() by PyErr_Print(), the 
> message is properly displayed; and on the other hand in my actual use 
> case, it works with some methods.
> 
> Still lost...
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