macOS non-bundle build cannot load Vulkan

[neebyA]

Current Behavior

When building Cemu on Mac, the build with default settings is not able to launch games, while the bundled (option -DMACOS_BUNDLE=ON) is. I looked through the logs and found this:

[18:02:47.090] Vulkan loader not available.
[18:02:49.817] Vulkan cant list devices because Vulkan loader failed

It looks like the MoltenVK library is not able to be found. I looked to find what the bundle does differently and found this:

Cemu/src/CMakeLists.txt

Lines 109 to 114 in f801fc1

	add_custom_command (TARGET CemuBin POST_BUILD
	COMMAND ${CMAKE_COMMAND} ARGS -E copy "/usr/local/lib/libMoltenVK.dylib" "${CMAKE_SOURCE_DIR}/bin/${OUTPUT_NAME}.app/Contents/Frameworks/libMoltenVK.dylib"
	COMMAND ${CMAKE_COMMAND} ARGS -E copy "${LIBUSB_PATH}" "${CMAKE_SOURCE_DIR}/bin/${OUTPUT_NAME}.app/Contents/Frameworks/libusb-1.0.0.dylib"
	COMMAND ${CMAKE_COMMAND} ARGS -E copy "${CMAKE_SOURCE_DIR}/src/resource/update.sh" "${CMAKE_SOURCE_DIR}/bin/${OUTPUT_NAME}.app/Contents/MacOS/update.sh"
	COMMAND bash -c "install_name_tool -add_rpath @executable_path/../Frameworks ${CMAKE_SOURCE_DIR}/bin/${OUTPUT_NAME}.app/Contents/MacOS/${OUTPUT_NAME}"
	COMMAND bash -c "install_name_tool -change ${LIBUSB_PATH} @executable_path/../Frameworks/libusb-1.0.0.dylib ${CMAKE_SOURCE_DIR}/bin/${OUTPUT_NAME}.app/Contents/MacOS/${OUTPUT_NAME}")

This copies the libMoltenVK dylib into the Frameworks directory, and adds the directory to the runtime path.

So far, I've tried adding

  find_library(MOLTENVK_LIB MoltenVK)
  if(MOLTENVK_LIB)
    target_link_libraries(CemuCafe PRIVATE ${MOLTENVK_LIB})
  endif()

to this block, as well as setting LDFLAGS to -L/opt/homebrew/opt/molten-vk/lib -lMoltenVK, and confirmed with otool that the dylib appears in the load commands:

Load command 13
          cmd LC_LOAD_DYLIB
      cmdsize 80
         name /opt/homebrew/opt/molten-vk/lib/libMoltenVK.dylib (offset 24)
   time stamp 2 Wed Dec 31 16:00:02 1969
      current version 1.0.0
compatibility version 1.0.0

However, this still has not worked.

The following workarounds have succeeded:

1. Using the app bundle with -DMACOS_BUNDLE=ON
2. Adding a new runtime path to the binary with install_name_tool -add_rpath /opt/homebrew/lib bin/Cemu_release
3. Symlinking the dylib into the existing rpath: ln -s /opt/homebrew/Cellar/molten-vk/1.3.0/lib/libMoltenVK.dylib build/vcpkg_installed/arm64-osx/lib/

Any ideas for a way to resolve this through cmake instead of manually?

Expected Behavior

The Mac non-bundle build should be able to launch games with the Vulkan renderer

Steps to Reproduce

1. Follow the macOS build steps: https://github.com/cemu-project/Cemu/blob/main/BUILD.md#build-cemu-using-cmake
2. Launch the ./bin/Cemu_release executable
3. Navigate to Options->General Settings->Graphics and observe the only available Graphics API is OpenGL

System Info (Optional)

OS: macOS 15.4.1
GPU: Apple M4

Emulation Settings (Optional)

No response

Logs (Optional)

log.txt

[hauntek]

Yes, I also encountered this problem.

[neebyA]

One more workaround I've found is to disable vcpkg, i.e.

cmake -S . -B build -DCMAKE_BUILD_TYPE=Release -DCMAKE_OSX_ARCHITECTURES=arm64 -DCMAKE_POLICY_VERSION_MINIMUM=3.5 -DENABLE_VCPKG=OFF -DCMAKE_MAKE_PROGRAM=/opt/homebrew/bin/ninja -G Ninja

though this requires more libraries to be installed via homebrew:

brew install libusb pugixml rapidjson libzip glslang glm fmt hidapi wxwidgets

and probably some others that I happened to already have. This worked because in this case /opt/homebrew/lib was automatically added to the runtime path:

Load command 51
          cmd LC_RPATH
      cmdsize 32
         path /opt/homebrew/lib (offset 12)

Finding some way via cmake to ensure that MoltenVK dylib's directory (e.g. /opt/homebrew/lib) gets added to the rpath would be enough to close this issue.