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.
