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Xcode Build Troubleshooting for MLX-Audio Swift Framework

Metal Toolchain Error with Xcode Beta

Problem

When building the MLXAudio framework with Xcode Beta versions, you may encounter this error:

error: cannot execute tool 'metal' due to missing Metal Toolchain; use: xcodebuild -downloadComponent MetalToolchain

This error occurs because Xcode Beta versions often ship without the complete Metal Toolchain component, which is required to compile Metal shaders (.metal files) used by the mlx-swift dependency.

Root Cause

  • Xcode Beta installations may have incomplete toolchain components
  • The mlx-swift framework dependency requires Metal shader compilation
  • Metal Toolchain component is needed but not installed by default in some Beta versions

Solution

Step 1: Install Metal Toolchain

# For Xcode Beta (adjust path as needed)
env DEVELOPER_DIR=/Applications/Xcode-beta.app xcodebuild -downloadComponent MetalToolchain

# For Xcode Beta with specific version number
env DEVELOPER_DIR=/Applications/Xcode-26.0.0-Beta.app xcodebuild -downloadComponent MetalToolchain

Step 2: Verify Installation After the download completes (approximately 688MB), you should see:

Done downloading: Metal Toolchain 17A5295f.

Step 3: Retry Build

# Command line build
env DEVELOPER_DIR=/Applications/Xcode-beta.app xcrun xcodebuild -IDEClonedSourcePackagesDirPathOverride=$PWD/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath $PWD/.derivedData build -scheme MLXAudio -destination platform=macOS,arch=arm64

# Or simply rebuild in Xcode GUI

Alternative Solutions

Use Stable Xcode

If you have a stable Xcode installation, you can switch to it:

# Check available Xcode installations
ls /Applications/ | grep -i xcode

# Use stable Xcode instead
env DEVELOPER_DIR=/Applications/Xcode.app xcrun xcodebuild -scheme MLXAudio -destination platform=macOS,arch=arm64 build

Fix xcode-select Path

Ensure xcode-select points to the correct installation:

# Check current setting
xcode-select -p

# Switch to stable Xcode if needed
sudo xcode-select --switch /Applications/Xcode.app

# Or switch to Beta if Metal Toolchain is installed
sudo xcode-select --switch /Applications/Xcode-beta.app

Build Commands Reference

Standard Build Commands

# Basic build
swift build

# Xcode project build
xcodebuild -scheme MLXAudio -destination platform=macOS,arch=arm64 build

# With custom derived data path
xcodebuild -derivedDataPath $PWD/.derivedData build -scheme MLXAudio -destination platform=macOS,arch=arm64

# Full command with all flags (as used in CI/testing)
env DEVELOPER_DIR=/Applications/Xcode-beta.app xcrun xcodebuild -IDEClonedSourcePackagesDirPathOverride=$PWD/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath $PWD/.derivedData build -scheme MLXAudio -destination platform=macOS,arch=arm64

Debug Information Commands

# Check Xcode version
xcodebuild -version

# List available SDKs
xcodebuild -showsdks

# List schemes
xcodebuild -list

# Check Metal toolchain availability
which metal

Requirements

  • Hardware: Apple Silicon Mac (M1 or newer)
  • OS: macOS 14.0+
  • Xcode: 15.0+ or compatible Beta with Metal Toolchain
  • Dependencies: MLX Swift framework will be automatically resolved

Related Issues

This fix resolves build failures in:

  • Swift Package Manager builds
  • Xcode GUI builds
  • CI/CD pipeline builds using Xcode Beta
  • Command line builds with xcodebuild

The issue specifically affects compilation of Metal shaders in the mlx-swift dependency, which provides GPU-accelerated operations for the TTS models.