Test project builds on Windows 11 64-bit but doesn't work in Godot

[aliendisco]

I tried compiling beta 8 and 9 versions of Godot-cpp and demo project and they compile ok. But extension doesn't work in Godot b8/b9.

I also tried building GDExtensionSummator and got same results.
Here's also link to GDExtensionSummator issue I posted: Link

Everything work OK on linux x64.

The error:

  Can't open dynamic library: C:/Users/Bostjan/work/git/godot-cpp/test/demo/bin/libgdexample.windows.template_debug.x86_64.dll, error: Error 126: The specified module could not be found.
  .
  core/extension/gdextension.cpp:400 - GDExtension dynamic library not found: C:/Users/Bostjan/work/git/godot-cpp/test/demo/bin/libgdexample.windows.template_debug.x86_64.dll
  Failed loading resource: res://example.gdextension. Make sure resources have been imported by opening the project in the editor at least once.
  Transient parent has another exclusive child.
  Cannot get class 'Example'.
  Cannot get class 'ExampleMin'.
  In Object of type 'MissingNode': Attempt to connect nonexistent signal 'custom_signal' to callable 'Node(main.gd)::_on_Example_custom_signal'.

[fatduckling]

I got it to work after doing a make clean.

I ran directly from terminal: cmake .. && make instead of doing through Visual studio.

[epchain]

I have the same issue with Godot 4.0beta10. I do clean and successful builds of godot-cpp and godot-cpp/test (commit 3da6db4...) according to instructions from this page (a bit outdated) with the same error messages in Godot. Both official Godot 4.0beta10 build and custom build of commit d0398f6... behave similarly. I build on Windows 10 x64 with MSYS2 Mingw-w64 v12.2.0.
Before building I dumped extension_api.json and gdextension_interface.h from Godot as suggested in godot-cpp/gdextension/README.md, updated them in godot-cpp/gdextension and immediately see difference: godot-cpp's extension_api.json doesn't have entries for FramebufferCacheRD and UniformSetCacheRD which are present in Godot. This means godot-cpp 3da6db4... looks like not so synced with Godot d0398f6...
If it helps, I attached my build options and logs:
godot-cpp_build-flags.zip
godot-cpp_build-log.zip
godot-cpp-test_build-log.zip

[AmberOrange]

Having the same issue here too, Windows 10 x64 with MSYS2 Mingw-w64

[feiyunw]

You can use Dependencies to check your DLL dependcies.
Copy them (libgcc_s_seh-1.dll, libstdc++-6.dll and libwinpthread-1.dll) from MinGW installation to the same directory where libgdexample.windows.*.dll resides (i.e. godot-cpp\test\demo\bin).

Better to link the DLL statically, without any external MinGW DLL dependency.

[epchain]

Thanks, @feiyunw!
I've walked through the whole building process from scratch on Godot v.4.0.stable / Windows 10 x64 / MSYS2 Mingw-w64 v12.2.0 and can confirm that missing dependency libraries are cause of this issue. Default build of godot-cpp/test depends on dynamic libraries libgcc_s_seh-1.dll, libstdc++-6.dll and libwinpthread-1.dll. Copying them to godot-cpp/test/demo/bin solves the issue. You can get them from <MSYS2-installation>\mingw64\bin. As for linking those libraries statically, you can add the following line to godot-cpp/test/SConstruct file:

...
else:
    # This line
    env["LINKFLAGS"] = "-static-libgcc -static-libstdc++ -static -pthread"
    library = env.SharedLibrary(
...

However, the error message Godot gives out in this situation is still misleading. It could be something like "failed to load" instead of "couldn't find" a library.

[feiyunw]

As for linking those libraries statically, you can add the following line to godot-cpp/test/SConstruct file:

You may be interested in PR #1082

[doonv]

I was also having this issue, and @epchain 's solution solved it for me! Thank you so much!

[NatGazer]

Devs, I love your work but, if possible I would like to know why, in 08/2023 with Godot 4.1.1, do I still have this problem. And by the way, thank you so much @feiyunw and @epchain for giving the solution, I've lost a week just to put gdextension to work because of this issue.

EDIT:
At least add env["LINKFLAGS"] = "-static-libgcc -static-libstdc++ -static -pthread" to the "hardcoded SConstruct file" present in the tutorial: https://docs.godotengine.org/en/stable/tutorials/scripting/gdextension/gdextension_cpp_example.html