Swift runtime DLL search path issue on Windows

[tishin]

After building the extension from tutorial on Windows and placing SimpleRunnerDriver.dll and SwiftGodot.dll into /bin I get the following error from Godot:

ERROR: Can't open dynamic library: C:/Projects/SimpleRunner-Base/bin/SimpleRunnerDriver.dll. Error: Error 126: The specified module could not be found..
   at: (platform/windows/os_windows.cpp:394)
ERROR: GDExtension dynamic library not found: C:/Projects/SimpleRunner-Base/bin/SimpleRunnerDriver.dll
   at: open_library (core/extension/gdextension.cpp:455)

The dll itself is obviously there. What appears to be missing is dll's dependencies: swiftCore.dll, swift_Concurrency.dll and so on. I managed to work around this issue by copying swift runtime directly into /bin. But there has to be a better way of doing this, right? Putting swift runtime in %PATH% environment variable doesn't seem to have any effect on the issue.

[tishin]

Godot runs LoadLibraryExA with LOAD_LIBRARY_SEARCH_DEFAULT_DIRS, which itself is a combination of

• LOAD_LIBRARY_SEARCH_APPLICATION_DIR - Godot's executable directory
• LOAD_LIBRARY_SEARCH_SYSTEM32 - System32 directory
• LOAD_LIBRARY_SEARCH_USER_DIRS - Custom dll directories added with AddDllDirectory. Godot adds GDExtension's directory using that api, that's why copying runtime into bin works

[migueldeicaza]

I suspect we will have a similar issue with Linux if Swift is not part of the system installation.

[rrenna]

Question from someone who doesn't quite understand how much of a blocker this is: If someone were to publish a game with a SwiftGodot extension - could the Swift runtime be copied to the appropriate folder during installation? Or is that folder off limits to be mutated on Windows by an installation wizard/Steam?

[migueldeicaza]

You can just copy it to the directory where your extension is (bin, see the comment from October 7

[rrenna]

Oh jeez I misunderstood - I thought the solution was the runtime needed to be in a bin subfolder in the installed computer after distribution to be runnable. Thanks for the clarification!