Hi

I have an existing C shared library that I am trying to link to a D shared library. The D shared library at present only has a binding (extern (C)) definition, nothing else.

When I try to create the shared library using the DMD command line I get link errors.

Platform is Windows 10 64-bit.

The command I am using is:

dmd -m64 -shared -v -L/LIBPATH:c:\ravi\lib -Lravimatrix.lib source\matrix.d

Partial output from DMD follows:

binary    C:\D\dmd2\windows\bin\dmd.exe
version   v2.069.2
config    C:\D\dmd2\windows\bin\sc.ini
parse     matrix
importall Dmatrix
import    object        (C:\D\dmd2\windows\bin\..\..\src\druntime\import\object.d)
import    std.stdint    (C:\D\dmd2\windows\bin\..\..\src\phobos\std\stdint.d)
import    core.stdc.stdint      (C:\D\dmd2\windows\bin\..\..\src\druntime\import\core\stdc\stdint.d)
...
import    core.stdc.string      (C:\D\dmd2\windows\bin\..\..\src\druntime\import\core\stdc\string.d)
semantic2 Dmatrix
semantic3 Dmatrix
code      Dmatrix
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\\bin\x86_amd64\link.exe /NOLOGO matrix   /DLL /LIBPATH:c:\ravi\lib ravimatrix.lib /OPT:NOICF /LIBPATH:"C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\\lib\amd64" /LIBPATH:"C:\Program Files (x86)\Windows Kits\8.1\\lib\x64"  /LIBPATH:"C:\Program Files (x86)\Windows Kits\10\\lib\10.0.10240.0\ucrt\x64" legacy_stdio_definitions.lib
matrix.obj : error LNK2001: unresolved external symbol _D3std5stdio12__ModuleInfoZ
matrix.obj : error LNK2001: unresolved external symbol _D15TypeInfo_Struct6__vtblZ
matrix.obj : error LNK2019: unresolved external symbol _d_assert referenced in function _D7Dmatrix8__assertFiZv
matrix.obj : error LNK2019: unresolved external symbol _d_unittest referenced in function _D7Dmatrix15__unittest_failFiZv
matrix.obj : error LNK2019: unresolved external symbol _d_arraybounds referenced in function _D7Dmatrix7__arrayZ
LINK : error LNK2001: unresolved external symbol _DllMainCRTStartup
matrix.dll : fatal error LNK1120: 6 unresolved externals
--- errorlevel 1120

On Sunday, 17 January 2016 at 16:10:01 UTC, Dibyendu Majumdar wrote:
> LINK : error LNK2001: unresolved external symbol _DllMainCRTStartup

_DllMainCRTStartup:

D shared libs on windows still require a DllMain. If you follow this post here[1] to create one, it should solve some of your problem.

[1] http://wiki.dlang.org/Win32_DLLs_in_D

    Bit

On Sunday, 17 January 2016 at 19:10:16 UTC, bitwise wrote:
> On Sunday, 17 January 2016 at 16:10:01 UTC, Dibyendu Majumdar wrote:
>> LINK : error LNK2001: unresolved external symbol _DllMainCRTStartup
>
> _DllMainCRTStartup:
>
> D shared libs on windows still require a DllMain. If you follow this post here[1] to create one, it should solve some of your problem.
>
> [1] http://wiki.dlang.org/Win32_DLLs_in_D
>

Ok thanks - wasn't aware of that. Presumably there is no compiler flag to auto generate this?

Regards

On Sunday, 17 January 2016 at 22:12:44 UTC, Dibyendu Majumdar wrote:
> Presumably there is no compiler flag to auto generate this?

There's no compiler flag, but you can use this:

https://github.com/D-Programming-Language/druntime/blob/master/src/core/sys/windows/dll.d#L473

    Bit

On Monday, 18 January 2016 at 05:58:38 UTC, bitwise wrote:
> On Sunday, 17 January 2016 at 22:12:44 UTC, Dibyendu Majumdar wrote:
>> Presumably there is no compiler flag to auto generate this?
>
> There's no compiler flag, but you can use this:
>
> https://github.com/D-Programming-Language/druntime/blob/master/src/core/sys/windows/dll.d#L473
>
>     Bit

Thanks - that worked, but I had to write it this way:

  import std.c.windows.windows;
  import core.sys.windows.dll;
  mixin SimpleDllMain;

I noticed that above modules are documented in the library reference so I assume that this template is not supported?

Regards
Dibyendu

On Monday, 18 January 2016 at 23:53:45 UTC, Dibyendu Majumdar wrote:
>
> Thanks - that worked, but I had to write it this way:
>
>   import std.c.windows.windows;
>   import core.sys.windows.dll;
>   mixin SimpleDllMain;
>
> I noticed that above modules are documented in the library reference so I assume that this template is not supported?


Sorry meant to say 'not' documented.

On Monday, 18 January 2016 at 23:55:33 UTC, Dibyendu Majumdar wrote:
> On Monday, 18 January 2016 at 23:53:45 UTC, Dibyendu Majumdar wrote:
>>
>> Thanks - that worked, but I had to write it this way:
>>
>>   import std.c.windows.windows;
>>   import core.sys.windows.dll;
>>   mixin SimpleDllMain;
>>
>> I noticed that above modules are documented in the library reference so I assume that this template is not supported?
>
>
> Sorry meant to say 'not' documented.

Well..I think the docs are far from complete. It's an ongoing task to try and get them to where they need to be. Worst case scenario, is that someone removes that template, at which point you can simply go back in history on github and copy paste it into your own file. I don't see any reason that it would be removed though.

    Bit