Re: BOOST_LANGBINDING_DECL

Daniel Wallin <[email protected]> writes:

> At 01:38 2003-07-30, David Abrahams wrote:
>
>>IIRC, MinGW (and probably Cygwin, therefore) doesn't respond well when
>>you try to use __declspec(dll-imp/exp-ort) for individual members of a
>>class.  I get into trouble every time I do it.  That's why
>>Boost.Python only exports entire classes.  I always add a layer of
>>inheritance if I need to have inline or templated member functions in
>>a class with exported members.
>
> Ok. I am unable to get even the most trivial dll test with cygwin to work:
>
> A.cpp:
> struct __declspec(dllexport) A
> {
>    void f() {}
> };
>
> B.cpp
> struct __declspec(dllimport) A
> {
>    void f();
> };
>
> int main()
> {
>    A a;
>    a.f();
> }
>
> Jamfile:
> dll A
>          : A.cpp
>          : <include>$(BOOST_ROOT)
>          ;
>
> exe B
>          : B.cpp <dll>A
>          : <include>$(BOOST_ROOT)
>          ;
>
> Fails when linking... What am I doing wrong?

You need to stop having A::f() be inline, I'm guessing.
Cygwin is finicky, like I said.

There are plenty of examples of how to do this in the Boost.Python
codebase.

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com



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