Trying to create a trivial 64 bit D Lang DLL on a Windows 10 machine and cant get past linking.

[WhatMeWorry]

On Thursday, 1 October 2020 at 20:28:58 UTC, kinke wrote:
> On Thursday, 1 October 2020 at 20:03:19 UTC, WhatMeWorry wrote:
>> Yes, but shouldn't the /NOENTRY option take care of that. Say, 
>> I just want to make a DLL of simple functions.
>
> Your little example has 2 problems, the first being an 
> incompatible extern(D) ex/import (mydll.myAddSeven vs. 
> user.myAddSeven) and the second being an incomplete/wrong 
> linker cmdline. When changing the myAddSeven declarations to 
> extern(C++) (another option being a mydll.di header for the 
> import), it works with
>
>> dmd -m64 -shared -L/NOENTRY mydll.d
>> dmd -m64 user.d mydll.lib
>
> For more details, see also 
> https://wiki.dlang.org/Win32_DLLs_in_D.


Thanks all. I've gotten it to work with:

>dmd -m64 -ofmydll.dll  mydll.d  -L/NOENTRY -L/DLL

>dmd -m64 user.d mydll.lib

>user.exe
total = 12


But then I got cocky and decided to just added a writeln() in the 
mydll.d file and I've been fighting this link error ever since:

C:\Program Files (x86)\Microsoft Visual 
Studio\2019\Community\VC\Tools\MSVC\14.27.29110\bin\Hostx64\x64\link.exe /NOLOGO "mydll.obj" /OUT:"mydll.dll"  /DEFAULTLIB:phobos64 /NOENTRY /DLL /OPT:NOICF  /LIBPATH:"C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.27.29110\lib\x64" legacy_stdio_definitions.lib /LIBPATH:"C:\Program Files (x86)\Windows Kits\10\Lib\10.0.18362.0\ucrt\x64" /LIBPATH:"C:\Program Files (x86)\Windows Kits\10\lib\10.0.18362.0\um\x64"
    Creating library mydll.lib and object mydll.exp
mydll.obj : error LNK2019: unresolved external symbol fwrite 
referenced in function 
_D3std5stdio__T13trustedFwriteTaZQsFNbNiNePOS4core4stdcQBx6_iobufxAaZm
phobos64.lib(object_72_81a.obj) : error LNK2001: unresolved 
external symbol memcpy
phobos64.lib(exception_cf4_fff.obj) : error LNK2001: unresolved 
external symbol memcpy
phobos64.lib(bits_23fa_21c.obj) : error LNK2001: unresolved 
external symbol memcpy
phobos64.lib(gc_2413_a4e.obj) : error LNK2001: unresolved 
external symbol memcpy
phobos64.lib(gc_2415_a03.obj) : error LNK2001: unresolved 
external symbol memcpy
phobos64.lib(gc_2478_432.obj) : error LNK2001: unresolved 
external symbol memcpy
   o  o  o