Re: [Libvisual-devel] Making DLLs using mingw

[Vitaly V. B. <vit...@uk...>]

On Mon, 14 Feb 2005 21:41:24 +0100
Dennis Smit <sy...@yo...> wrote:

> And put it in front of every symbol you export, IE every >EVERY< 
> function.
Well, it is a common practice...

I believe it not a mandatory. I've built dll library and a import
library. Looks like every thing's fine.

[vitalyb@vb .libs]$ i386-pc-mingw32-objdump -x libvisual-0.dll
.....
[Ordinal/Name Pointer] Table
        [   0] __lv_initialized
        [   1] __lv_paramcontainer
        [   2] __lv_plugins
        [   3] __lv_plugins_actor
        [   4] __lv_plugins_input
        [   5] __lv_plugins_morph
        [   6] __lv_plugins_transform
        [   7] __lv_plugpath_cnt
        [   8] __lv_plugpaths
        [   9] __lv_progname
        [  10] __lv_userinterface
        [  11] _lv_blit_overlay_alpha32_mmx
        [  12] _lv_log
        [  13] _lv_scale_bilinear_32_mmx
        [  14] visual_actor_get_list
        [  15] visual_actor_get_next_by_name
        [  16] visual_actor_get_next_by_name_gl
....
        [ 371] visual_video_set_palette
        [ 372] visual_video_set_pitch
        [ 373] win32_sig_handler_sse@4
....

Every non-static symbol was exported. As by default is.

============ test.c
int main()
{
    return visual_actor_get_list();
}
============ 

[vitalyb@vb .libs]$ i386-pc-mingw32-gcc test.c -L. -lvisual.dll
[vitalyb@vb .libs]$ i386-pc-mingw32-objdump -x a.exe
....
The Import Tables (interpreted .idata section contents)
 vma:            Hint    Time      Forward  DLL       First
                 Table   Stamp     Chain    Name      Thunk
 00004000       00004054 00000000 00000000 000041bc 000040a0

        DLL Name: libvisual-0.dll
        vma:  Hint/Ord Member-Name Bound-To
        40e8       14  visual_actor_get_list
....

So, with GNU tools EXPORT stuff is not necessary.

But with non-GNU tools you need these at least within the headers,
for successful compilation, I think. Import library can be built
from .def (hm, I don't remember exactly) file.

-- 
Vitaly
GPG Key ID: F95A23B9