win32 api & lib issue

[Peter Hu]

On Thursday, 2 November 2023 at 10:02:29 UTC, Imperatorn wrote:
> On Thursday, 2 November 2023 at 09:58:21 UTC, Peter Hu wrote:
>> On Thursday, 2 November 2023 at 09:13:11 UTC, Imperatorn wrote:
>>> On Thursday, 2 November 2023 at 09:08:02 UTC, Imperatorn 
>>> wrote:
>>>> On Thursday, 2 November 2023 at 08:31:41 UTC, Peter Hu wrote:
>>>>> Greetings!
>>>>>
>>>>> From time to time I encountered issues on the subjected 
>>>>> after I upgraded my dmd package.Given below code :
>>>>>
>>>>> [...]
>>>>
>>>> If it still doesn't work try adding this:
>>>>
>>>> ```d
>>>> pragma(lib, "user32");
>>>> pragma(lib, "comdlg32");
>>>> ```
>>>
>>> Another alternative if you're using dub is to add this in 
>>> your dub.json instead:
>>>
>>> ```json
>>> "libs": ["user32", "comdlg32"]
>>> ```
>>>
>>> This seems be something related to DMD vs LDC. Because if I 
>>> change the compiler to DMD I also get unresolved external 
>>> symbols, but not with LDC.
>>>
>>> It seems the forwarding of directives from submodules are 
>>> different.
>> Thank you.
>>
>> Below two pragma solved the isse but am confused as they are 
>> already in the system path.This is the first time I have to 
>> include lib files here.How come other gui programs don't have 
>> to do this.
>> pragma(lib,"user32");
>> pragma(lib,"comdlg32");
>
> I'm not sure why, it works for me, but I think it could be 
> something dmd does different. The pragma lib is inserted into 
> the generated object file, or otherwise passed to the linker, 
> so the linker automatically links in that library.
>
> I'm guessing dmd for some reason does not see it in the 
> submodule, but I have no proof that's the issue, I'm just 
> guessing.

Really appreciated for the help.I am learning to understand.
Not using these two pragma in the source,other in the 
commandline:dmd -m64 user32.lib comdlg32.lib test.d 
compiled.But---
In an IDE say PoseidonD it still failed to compile even if I 
provided the library path to the compiler,I just can't understand 
how come my other small programs ( based on gui libslike 
DFL2,iup4D,dwt,NAppGui4D ) works fine without having to provide 
pragma in the source before compiling.