Linker error for core.sys.windows.winuser imports when compiling as 64 bit.

[Chris M.]

On Sunday, 1 July 2018 at 01:16:59 UTC, Jonathan M Davis wrote:
> On Sunday, July 01, 2018 00:42:30 spikespaz via 
> Digitalmars-d-learn wrote:
>> Hey guys, I'm getting a linker error when compiling with DMD 
>> `-m63` that I don't get as 23 bit.
>>
>> I'm importing `ShowWindow` from `core.sys.windows.winuser`, 
>> and I get the following:
>>
>> C:\D\dmd2\windows\bin\lld-link.exe: warning: main.obj: 
>> undefined
>> symbol: ShowWindow
>> error: link failed
>> Error: linker exited with status 1
>>
>> My compiler command is `dmd main.d -m64 -i -O -release -inline
>> -boundscheck=off
>> `.
>>
>> I don't think the source code would make a difference other 
>> than to say that I'm calling `ShowWindow`.
>>
>> Any help would be much appreciated. Thanks!
>
> Well, per the MSDN page, that symbol is in User32.lib, so make 
> sure that you're linking against it - though why it would link 
> against it with 32-bit and not 64-bit, I don't know.
>
> - Jonathan M Davis

Check to make sure it's actually defined in user32.lib. I'm 
having a similar issue and would love to know why these functions 
are apparently not being defined

https://forum.dlang.org/thread/ncarbitntjeobljragfd@forum.dlang.org