Re: [PATCH] tests: import variables for MSVC.

[Vincent Torri]

On Fri, 24 Sep 2010, Peter Rosin wrote:

> Hi!
> I don't know how to set up the defines so that EXTERN becomes
>
> 1. "extern" when you use a static library
> 2. "extern" when you build a static library
> 3. "extern declspec(dllimport)" when you use a shared library
> 4. "extern declspec(dllexport)" when you build a shared library
>
> I could fix 2 and 4, but separating 1 and 3 is not possible. Since
> extern declspec(dllimport) works everywhere with MSVC I'm taking the
> easy option with this patch.
>
> Or should I add -DBUILDING_FOO to Makefile.am and variations of the below
> to the code?
>
> #ifdef _MSC_VER
> # ifdef BUILDING_FOO
> #  ifdef DLL_EXPORT
> #   define EXTERN extern declspec(dllexport)
> #  endif
> # else
> #  define EXTERN extern declspec(dllimport)
> # endif
> #endif
> #ifndef EXTERN
> # define EXTERN extern
> #endif

here is what I use:

http://trac.enlightenment.org/e/browser/trunk/PROTO/evil/src/lib/Evil.h#L7

It's what you do, with just an additional else in DLL_EXPORT case, without 
your #ifndef.

works fine with gcc (mingw, mingw-w64, mingw32ce) and vc++

hth

Vincent Torri