Real simple unresolved external symbols question...

[Rumbu]

On Tuesday, 9 February 2021 at 19:37:17 UTC, WhatMeWorry wrote:
>
> I'm trying to create a super simple dynamic library consisting 
> of two files:
>
>
>  ------------ file2.d ----------------------
> extern(D):
>     double addEight(double d) { return (d + 8.0); }
> 	
> ------------ fileB.d ----------------------
> extern(D)
> {
>     string concatSuffix(string s) { return (s ~ ".ext"); }
> }
>
>
>>dmd -m64 -c file2.d
>>dmd -m64 -c fileB.d
> creates file2.obj and fileB.obj files
>
> link.exe /DLL /NOENTRY file2.obj fileB.obj msvcrt.lib
>
> fileB.obj : error LNK2019: unresolved external symbol 
> _D12TypeInfo_Aya6__initZ referenced in function 
> _D5fileB12concatPrefixFAyaZQe
> fileB.obj : error LNK2019: unresolved external symbol 
> _d_arraycatT referenced in function 
> _D5fileB12concatPrefixFAyaZQe
>
> Ok. I find _d_arraycatT in the D website at:
>
> https://dlang.org/library/rt/lifetime/_d_arraycat_t.html
>
> So I thought, this symbol will be in phobos64.lib.  But when I 
> add it to the command, all hell breaks loose:
>
>
>>link.exe /DLL /NOENTRY file2.obj fileB.obj msvcrt.lib 
>>phobos64.lib
>
> phobos64.lib(bits_23fa_21c.obj) : error LNK2001: unresolved 
> external symbol memcpy
>  o  o  o
> file2.dll : fatal error LNK1120: 57 unresolved externals
>
>
> So I'm stuck and don't have a clue as to how to continue.
>
> I thought Phobos64.lib was self-contained.  Do I need to add 
> other libraries?  And how do I know which ones?

You have 2 obj files, and you link them. Where do you want the 
"self contained" to be present?

The missing symbols in your case are in druntime.lib, not in 
phobos.