GHC compile DLL for use in VBA - excel

Question

This is an alternative approach to this question here: Export Haskell lib as DLL
I am working with GHC version 8.6.1 [latest] and am following the documentation for compiling a DLL from a haskell library for the subsequent use in VBA.
My files look like this:
Adder.hs:
{-# LANGUAGE ForeignFunctionInterface #-}
module Adder where
adder :: Int -> Int -> IO Int
adder x y = return (x+y)
foreign export ccall adder :: Int -> Int -> IO Int
StartEnd.c:
#include <Rts.h>
void HsStart() {
int argc = 1;
char* argv[] = {"ghcDll", NULL};
char** args = argv;
hs_init(&argc, &args);
}
void HsEnd() {
hs_exit();
}
I copied the folder ghc-8.6.1\lib\include to the build location and copied the two files into that folder (because I cannot figure out how to pass the -I[PATH] parameter correctly).
Running these compilation steps, I get:
ghc -c Adder.hs
--> no error
ghc -c StartEnd.c
--> no error
ghc -shared -no-hs-main -o Adder.dll Adder.o Adder_stub.h StartEnd.o
--> no error
and the files
Adder.dll
Adder.dll.a
Adder.hi
Adder.o
Adder_stub.h
startEnd.o
I tried using the third compilation command like it is in the documentation ghc -shared -o Adder.dll Adder.o Adder_stub.h StartEnd.o and with the parameter -no-hs-main just to be sure.
My VBA script looks like this:
Private Declare Function Adder Lib "PATH\TO\Adder.dll" Alias "adder" _
(ByVal x As Long, ByVal y As Long) As Long
Private Declare Sub HsStart Lib "PATH\TO\Adder.dll" ()
Private Declare Sub HsEnd Lib "PATH\TO\Adder.dll" ()
Public Sub test()
HsStart
MsgBox "12 + 5 = " & Adder(12, 5)
HsEnd
End Sub
However, whenever I try to run the Sub test, I get the error message:
Run-Time error '48'
File not found:
PATH\TO\Adder.dll
Can you please tell me where I made a mistake and how I can fix it?
If it helps, the output of dumpbin /EXPORTS Adder.dll is this:
Microsoft (R) COFF/PE Dumper Version 14.00.24234.1
Copyright (C) Microsoft Corporation. All rights reserved.
Dump of file Adder.dll
File Type: DLL
Section contains the following exports for Adder.dll
00000000 characteristics
5BBD9533 time date stamp Wed Oct 10 07:59:15 2018
0.00 version
1 ordinal base
29737 number of functions
29737 number of names
ordinal hint RVA name
1 0 004E0F18 ALLOC_BH_adm
...
75 4A 00001681 HsEnd
76 4B 00001640 HsStart
...
472 1D7 00001540 adder
...
My Path:
C:\Users\scfa\AppData\Local\Programs\MiKTeX 2.9\miktex\bin\x64\;C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin;C:\Users\scfa\Documents\myProgramms\dev_msys2\mingw64\bin;C:\Users\scfa\Documents\myProgramms\dev_msys2\mingw32\bin;C:\Users\scfa\Documents\myProgramms\ghc-8.6.1\bin;C:\Users\scfa\Documents\myProgramms\ghc-8.6.1\mingw\bin