llama : add required tools check in build-xcframework.sh

Author: danbev

build-xcframework.sh

@@ -14,6 +14,22 @@ GGML_METAL_EMBED_LIBRARY=ON
 GGML_BLAS_DEFAULT=ON
 GGML_METAL_USE_BF16=ON
 
+check_required_tool() {
+    local tool=$1
+    local install_message=$2
+
+    if ! command -v $tool &> /dev/null; then
+        echo "Error: $tool is required but not found."
+        echo "$install_message"
+        exit 1
+    fi
+}
+
+echo "Checking for required tools..."
+check_required_tool "cmake" "Please install CMake (brew install cmake)"
+check_required_tool "xcodebuild" "Please install Xcode and Xcode Command Line Tools (xcode-select --install)"
+check_required_tool "libtool" "Please install libtool which should be available with Xcode Command Line Tools (CLT). Make sure Xcode CLT is installed (xcode-select --install)"
+
 set -xe
 
 rm -rf build-apple
@@ -204,5 +220,5 @@ xcodebuild -create-xcframework \
     -framework $(pwd)/build-visionos-sim/framework/llama.framework \
     -output $(pwd)/build-apple/llama.xcframework
 
-# The generated framework can be found in build-ios/llama.xcframework and
+# The generated framework can be found in build-apple/llama.xcframework and
 # can be added to a projects "Frameworks, Libraries, and Embedded Content"