fix(build): build with Xcode 27 / Swift 6.4

build.sh

@@ -51,7 +51,9 @@ else
     exit 1
 fi
 METALLIB_BUILD_DIR=".build/metallib_build"
-METALLIB_DEST=".build/arm64-apple-macosx/release"
+# Ask SwiftPM for the real bin dir: Swift 6.4+ builds into .build/out/Products/Release
+# instead of .build/arm64-apple-macosx/release.
+METALLIB_DEST="$(swift build -c release --show-bin-path)"
 
 rm -rf "$METALLIB_BUILD_DIR"
 mkdir -p "$METALLIB_BUILD_DIR"
@@ -77,25 +79,19 @@ fi
 
 popd > /dev/null
 
-# Copy the freshly built metallib next to the binary, explicitly naming it default.metallib for mlx-c
+# Copy the freshly built metallib next to the binary. MLX loads a colocated
+# mlx.metallib before anything else, so that name guarantees the full kernel set
+# wins over the partial default.metallib SwiftPM puts in mlx-swift_Cmlx.bundle.
+# default.metallib is kept for mlx-c.
 mkdir -p "$METALLIB_DEST"
-if [ -f "$METALLIB_BUILD_DIR/lib/mlx.metallib" ]; then
-    cp "$METALLIB_BUILD_DIR/lib/mlx.metallib" "$METALLIB_DEST/default.metallib"
-    echo "✅ Built and copied default.metallib to $METALLIB_DEST/"
-elif [ -f "$METALLIB_BUILD_DIR/mlx.metallib" ]; then
-    cp "$METALLIB_BUILD_DIR/mlx.metallib" "$METALLIB_DEST/default.metallib"
-    echo "✅ Built and copied default.metallib to $METALLIB_DEST/"
-else
-    # Search for it anywhere in the build dir
-    BUILT=$(find "$METALLIB_BUILD_DIR" -name "mlx.metallib" | head -1)
-    if [ -n "$BUILT" ]; then
-        cp "$BUILT" "$METALLIB_DEST/default.metallib"
-        echo "✅ Built and copied default.metallib to $METALLIB_DEST/"
-    else
-        echo "❌ Failed to build mlx.metallib. Check cmake output above."
-        exit 1
-    fi
+BUILT=$(find "$METALLIB_BUILD_DIR" -name "mlx.metallib" | head -1)
+if [ -z "$BUILT" ]; then
+    echo "❌ Failed to build mlx.metallib. Check cmake output above."
+    exit 1
 fi
+cp "$BUILT" "$METALLIB_DEST/mlx.metallib"
+cp "$BUILT" "$METALLIB_DEST/default.metallib"
+echo "✅ Built and copied mlx.metallib + default.metallib to $METALLIB_DEST/"
 
 # --- 4. Build SwiftLM ---
 echo ""
@@ -105,6 +101,6 @@ swift build -c release
 echo ""
 echo "=============================================="
 echo "✅ Build complete!"
-echo "   Binary:   .build/release/SwiftLM"
+echo "   Binary:   $METALLIB_DEST/SwiftLM"
 echo "   Metallib: $METALLIB_DEST/mlx.metallib"
 echo "=============================================="

run_benchmark.sh

@@ -86,7 +86,7 @@ print_server_log() {
     fi
 }
 
-export METAL_LIBRARY_PATH="$(pwd)/.build/arm64-apple-macosx/release"
+export METAL_LIBRARY_PATH="$(cd .build/release 2>/dev/null && pwd -P)"
 
 if [ -n "${SUITE_OPT:-}" ]; then
     # Sub-process invocation from automated matrix — skip interactive menu
@@ -302,9 +302,8 @@ if { [ "$suite_opt" == "5" ] || [ "$suite_opt" == "6" ]; } && [[ "$FULL_MODEL" =
 fi
 
 # Quick sanity check
-if [ -f ".build/arm64-apple-macosx/release/SwiftLM" ]; then
-    BIN=".build/arm64-apple-macosx/release/SwiftLM"
-elif [ -f ".build/release/SwiftLM" ]; then
+# .build/release is a symlink to the real bin dir on every SwiftPM layout
+if [ -f ".build/release/SwiftLM" ]; then
     BIN=".build/release/SwiftLM"
 else
     echo "⚠️  SwiftLM release binary not found! Please compile the project by running ./build.sh first."

scripts/profiling/mtp_bench.py

@@ -30,7 +30,7 @@
 import urllib.request
 import urllib.error
 
-SWIFTLM_PATH = ".build/arm64-apple-macosx/release/SwiftLM"
+SWIFTLM_PATH = ".build/release/SwiftLM"
 PORT = 5430
 
 CONFIGS = [

scripts/profiling/profile_runner.py

@@ -16,7 +16,7 @@
     {"name": "MTP + TurboQuant", "flags": ["--stream-experts", "--mtp", "--num-mtp-tokens", "4", "--turbo-kv"]},
 ]
 
-SWIFTLM_PATH = ".build/arm64-apple-macosx/release/SwiftLM"
+SWIFTLM_PATH = ".build/release/SwiftLM"
 
 def get_physical_ram_gb():
     try:

scripts/profiling/profile_speculative.py

@@ -1,6 +1,6 @@
 import subprocess, time, json, urllib.request, os, signal
 
-SWIFTLM_PATH = ".build/arm64-apple-macosx/release/SwiftLM"
+SWIFTLM_PATH = ".build/release/SwiftLM"
 MAIN_MODEL = "mlx-community/gemma-4-26b-a4b-it-4bit"
 DRAFT_MODEL = "mlx-community/gemma-4-e4b-it-4bit"
 

tests/SwiftBuddyTests/AudioTests.swift

@@ -12,7 +12,7 @@ final class AudioTests: XCTestCase {
             .deletingLastPathComponent() // SwiftLM
 
         let debugExecutableURL = projectRoot.appendingPathComponent(".build/arm64-apple-macosx/debug/SwiftLM")
-        let releaseExecutableURL = projectRoot.appendingPathComponent(".build/arm64-apple-macosx/release/SwiftLM")
+        let releaseExecutableURL = projectRoot.appendingPathComponent(".build/release/SwiftLM")
 
         let executableURL = FileManager.default.fileExists(atPath: debugExecutableURL.path) 
                             ? debugExecutableURL 

tests/SwiftBuddyTests/VLMTests.swift

@@ -43,7 +43,7 @@ final class VLMTests: XCTestCase {
             .deletingLastPathComponent()
 
         let debugExecutableURL = projectRoot.appendingPathComponent(".build/arm64-apple-macosx/debug/SwiftLM")
-        let releaseExecutableURL = projectRoot.appendingPathComponent(".build/arm64-apple-macosx/release/SwiftLM")
+        let releaseExecutableURL = projectRoot.appendingPathComponent(".build/release/SwiftLM")
         let executableURL = FileManager.default.fileExists(atPath: debugExecutableURL.path)
             ? debugExecutableURL
             : releaseExecutableURL