Re: [Mingw-users] Building DLL for Visual Studio 2008

[Vincent T. <vt...@un...>]

On Wed, 29 Oct 2008, Greg Chicares wrote:

> On 2008-10-29 17:29Z, Vincent Torri wrote:
>>
>> On Wed, 29 Oct 2008,   wrote:
>>
>>>> 1) if I build Lib1:
>>>>  a) if i build the DLL, EAPI is defined to __declspec(dllexport)
>>>>  a) If I build the static lib, EAPI is defined to nothing.
>>>> 2) if I do not build Lib1, EAPI is defined to __declspec(dllimport)
>>>
>>>> Hence, if in Lib2, I include that main header file of Lib1, all the
>>>> declaration of Lib1 functions will have __declspec(dllimport)
>>>>
>>>> is it correct ?
>>>
>>> If Lib1 is built as a static library, then probably not.
>>
>> and what should I do, then ?
>
> Use a more complex conditional that defines your API macro
> to be empty when you're building or using a static library.
> Here's mine:
>
> http://cvs.savannah.gnu.org/viewvc/lmi/lmi/so_attributes.hpp?view=annotate
>
> Or just don't ever use any dll attribute, and always link
> dlls directly.

so doing something like that:

1) if I build Lib1:
   a) if i build the DLL, EAPI is defined to __declspec(dllexport)
   b) if I build the static lib, EAPI is defined to nothing.

2) if I do not build Lib1 (i'm currently building another lib, say, Lib2):
   a) if I build the DLL of Lib2, EAPI is defined to __declspec(dllimport)
   b) if I build the static lib of Lib2, EAPI is defined to nothing.

that is:

#ifdef _WIN32
# ifdef EFL_EVIL_BUILD
#  ifdef DLL_EXPORT
#   define EAPI __declspec(dllexport)
#  else
#   define EAPI
#  endif /* ! DLL_EXPORT */
# else
#  ifdef DLL_EXPORT
#   define EAPI __declspec(dllimport)
#  else
#   define EAPI
#  endif /* ! DLL_EXPORT */
# endif /* ! EFL_EVIL_BUILD */
#endif /* _WIN32 */

?

if so, it can be factorized to:

#ifdef _WIN32
# ifdef DLL_EXPORT
#  ifdef EFL_EVIL_BUILD
#   define EAPI __declspec(dllexport)
#  else
#   define EAPI __declspec(dllimport)
#  endif
# else
#  #define EAPI
# endif
#endif

?

Vincent Torri