Building on macOS (Metal): "xcrun: error: unable to find utility "metal", not a developer tool or in PATH"

[ChristianWeyer]

LocalAI version:

Commit b739cbb

Environment, CPU architecture, OS, and Version:

macOS 14.4.1
MBP Mx Max

Darwin MacBook-Pro 23.4.0 Darwin Kernel Version 23.4.0: Fri Mar 15 00:12:37 PDT 2024; root:xnu-10063.101.17~1/RELEASE_ARM64_T6031 arm64

Describe the bug

Compiling (with all documented pre-reqs from https://localai.io/basics/build/)

Running into this error:
xcrun: error: unable to find utility "metal", not a developer tool or in PATH

To Reproduce

Check out commit b739cbb

make clean

make build

Expected behavior

Successful compilation

Logs

[  1%] Compiling Metal kernels
xcrun: error: unable to find utility "metal", not a developer tool or in PATH
make[4]: *** [bin/default.metallib] Error 72
make[3]: *** [CMakeFiles/ggml-metal.dir/all] Error 2
make[2]: *** [all] Error 2
make[1]: *** [grpc-server] Error 2
make: *** [backend/cpp/llama/grpc-server] Error 2

---

My previous checkout built successfully, BTW 🙂 (not sure which commit).
Now I do not have a working version... 🙈

[ChristianWeyer]

Turns out that maybe some recent XCode update changed things...

This fix helped me:
gfx-rs/gfx#2309 (comment)