System.DllNotFoundException in pocketsphinx swig Unity windows build - unity3d

Question

Goal:
Obtain a wrapper dll to use pocketsphinx in a Unity project in Windows.
Problem:
When running the test program, I get an annoying System.DllNotFoundException even though the .so file is in the same directory as the mono program.
Setup and attempted actions:
For starters, I am using Cygwin. I was able to build absolutely everything, sphinxbase and pocketsphinx no problem. Then I went into the swig/csharp directory and attempted make. It does make, a .so file is created. I am using the default Makefile and make in cygwin. Rules 1-3 run perfectly fine, building, linking and everything. So does the pocketsphinx_continuous test.
pocketsphinx.c: ../pocketsphinx.i
mkdir -p gen
swig -I.. -I../../../sphinxbase/swig -I../include -I../../sphinxbase/include \
-csharp \
-dllimport "libpocketsphinxwrap.so" \
-namespace "Pocketsphinx" -o sphinxbase.c \
-outdir gen ../../../sphinxbase/swig/sphinxbase.i
swig -I.. -I../../../sphinxbase/swig -I../include -I../../sphinxbase/include \
-csharp \
-dllimport "libpocketsphinxwrap.so" \
-namespace "Pocketsphinx" -o pocketsphinx.c \
-outdir gen ../pocketsphinx.i
libpocketsphinxwrap.so: pocketsphinx.c
gcc -fPIC pocketsphinx.c sphinxbase.c `pkg-config --libs --cflags pocketsphinx` -shared -o $#
test.exe: libpocketsphinxwrap.so
mcs test.cs gen/*.cs
run: test.exe
MONO_LOG_LEVEL=debug mono test.exe
clean:
rm -rf gen
rm -f libpocketsphinxwrap.so
rm -f pocketsphinx.c
rm -f sphinxbase.c
rm -f test.exe
.PHONY: run clean
When attempting mono test.exe - the following happens:
Unhandled Exception:
System.TypeInitializationException: The type initializer for 'Pocketsphinx.PocketSphinxPINVOKE' threw an exception. ---> System.TypeInitializationException: The type initializer for 'SWIGExceptionHelper' threw an exception. ---> System.DllNotFoundException: libpocketsphinxwrap.so
The .so is in the same directory as the test.exe file and is certainly being looked at because when running mono with MONO_LOG_LEVEL=debug, the output is:
Mono: DllImport error loading library 'C:\Users\fgera\Development\Tools\CMUSphinx\pocketsphinx\swig\csharp\libpocketsphinxwrap.so.dll': 'The system cannot find the file specified.
Many times over and over.
Any help will be greatly appreciated. Again, I need a libpocketsphinx.so x86_64 for windows in Unity to interop with the C# files.
Thanks.
--- edit - added relevant snippet. test.cs just calls this method from the wrapper data structure. These files were all generated by SWIG.
[global::System.Runtime.InteropServices.DllImport("libpocketsphinxwrap.so", EntryPoint="CSharp_Pocketsphinx_Decoder_GetConfig")]
public static extern global::System.IntPtr Decoder_GetConfig(global::System.Runtime.InteropServices.HandleRef jarg1);

Answer 1

I doubt Cygwin DLL is compatible with Mono/Unity. You need to create DLL in Visual Studio, then it will work.

Answer 2

Why do you test the so file with mono, while it is actually used in Unity?
Mono: DllImport error loading library 'C:\Users\fgera\Development\Tools\CMUSphinx\pocketsphinx\swig\csharp\libpocketsphinxwrap.so.dll': 'The system cannot find the file specified.
If file libpocketsphinxwrap.so does exist in C:\Users\fgera\Development\Tools\CMUSphinx\pocketsphinx\swig\csharp\, try rename libpocketsphinxwrap.so to libpocketsphinxwrap.so.dll so mono can find it.
See also mono pinvoke: library names and DllNotfoundException.
You can try build pocketsphinx with Visual Studio since it is offically supported.
BTW, I'd rather write the C# wrapper myself instead of using SWIG since there are many traps in P/Invoke and I don't think SWIG can handle all of them.