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digitalmars.D - DMD - issue building shared library

reply Dibyendu Majumdar <d.majumdar gmail.com> writes:
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
Jan 17 2016
parent reply bitwise <bitwise.pvt gmail.com> writes:
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
Jan 17 2016
parent reply Dibyendu Majumdar <d.majumdar gmail.com> writes:
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
Jan 17 2016
parent reply bitwise <bitwise.pvt gmail.com> writes:
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
Jan 17 2016
parent reply Dibyendu Majumdar <d.majumdar gmail.com> writes:
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
Jan 18 2016
parent reply Dibyendu Majumdar <d.majumdar gmail.com> writes:
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.
Jan 18 2016
parent bitwise <bitwise.pvt gmail.com> writes:
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
Jan 18 2016