[C++-sig] exporting __stdcall methods

[Nicolas Lelong]

Hi Dave,

sorry I linger in responding, I'm only getting back to business after some 
holidays :)

> I think it would be great to support these other calling conventions.

glad you see some interest in this too!

> Your patch looks good, but I'm quite surprised that it's so small.  Is
> that really all that's required to implement full stdcall/fastcall
> support?

hm, as I did this some time ago already, I took some time to test it a 
little more.
I extensively used the patch with stdcall "C" functions, but I investigated 
some more by tweaking the "polymorphism" test.

I seems to work all right for regular functions and member functions. I 
noticed a "limitation" though : if a pure virtual member function is 
exported with a given default implementation, this default implement _must_ 
the same calling convention as the pure virtual function. I'm not sure that 
this is annoying, perhaps this can be corrected : the problem comes from the 
'not_a_derived_class_member' call in 'class.hpp' (line 146 in boost 1.33 
release) - see attached file 'func_sig_def_impl_fail.cpp'.

I attach the tweaked 'polymorphism' files. I also added the support for 
__cdecl member functions, and changed the macros to enable the functionality 
to match more closely what is found in type traits lib, so I attach a patch 
for signature.hpp (not widely different from the previous one) and 
config.hpp.

I'm open to any thoughts or directions you could give me to integrate 
properly this patch into BPL.

Cheers,

Nicolas. 
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