correctly detect DLL on *nix when running from Python

lostmsu · lostmsu · commit a0a1dc1013ad · 2021-01-28T11:19:45.000-08:00
diff --git a/src/runtime/runtime.cs b/src/runtime/runtime.cs
@@ -37,6 +37,12 @@ private static string GetDefaultDllName()
             string dll = Environment.GetEnvironmentVariable("PYTHONNET_PYDLL");
             if (dll is not null) return dll;
 
+            try
+            {
+                LibraryLoader.Instance.GetFunction(IntPtr.Zero, "PyUnicode_GetMax");
+                return null;
+            } catch (MissingMethodException) { }
+
             string verString = Environment.GetEnvironmentVariable("PYTHONNET_PYVER");
             if (!Version.TryParse(verString, out var version)) return null;
 
