Script to compile spine runtime static library for macOS

build_spine_macos.sh

#!/bin/bash

SPINE_VERSION="3.7.83"
ARCHS=("x86_64")
SDK_VERSION="10.14"

ROOT_DIR=$(pwd)
WORKER=$(getconf _NPROCESSORS_ONLN)
BUILD_DIR="build/macos/spine"
LOG_FILE="$ROOT_DIR/$BUILD_DIR/build.log"

if [ -d "$BUILD_DIR/download" ]; then
  rm -rf "$BUILD_DIR/download"
fi
if [ -d "$BUILD_DIR/source" ]; then
  rm -rf "$BUILD_DIR/source"
fi

if [ -f "$LOG_FILE" ]; then
    rm "$LOG_FILE"
    touch "$LOG_FILE"
fi

mkdir -p "$BUILD_DIR/download"
mkdir -p "$BUILD_DIR/source"

error() {
	echo "$@" 1>&2
}

fail() {
	error "$@"
	exit 1
}

compile_c++() {
	includes=("${!2}")

	includeArg=""
	if [ ${#includes} -ne 0 ]; then
		for i in "${includes[@]}"; do
			includeArg+="-I \"$i\" "
		done
	fi

	if [ -f "$1" ]; then
		eval "$CXX $CXXFLAGS -c \"$1\" $includeArg -o \"${1%.cpp}.o\"" >> "$LOG_FILE" 2>&1 || fail "$1 compilation error"
	else
		fail "$1 doesn't exist"
	fi
}

ar_c++() {
	lib_name="$1"
	srcs=("${!2}")

	objects=""
	for f in "${srcs[@]}"; do
		filename_obj="${f%.cpp}.o"
		if [ ! -f "$filename_obj" ]; then
			fail "$filename_obj doesn't exist"
		else
			objects+="\"$filename_obj\" "
		fi
	done

	# echo "$AR -rcs \"$ROOT/$lib_name.a\" $objects"
	eval "$AR -rcs \"$lib_name.a\" $objects" >> "$LOG_FILE" 2>&1 || fail "ar error"
}

build_static_library() {
	lib_name="$1"
	files=("${!2}")
	includes=("${!3}")

	N=$WORKER
	for f in "${files[@]}"; do
		((i=i%N)); ((i++==0)) && wait
		compile_c++ "$f" includes[@] &
	done
	wait

	ar_c++ "$lib_name" files[@]
}

echo "Downloading: spine"
curl -Lo "$BUILD_DIR/download/spine-$SPINE_VERSION.tar.gz" "https://github.com/EsotericSoftware/spine-runtimes/archive/$SPINE_VERSION.tar.gz" >> "$LOG_FILE" 2>&1 || fail "Error download spine"
echo "Downloaded: spine"

echo " "
echo "Uncompressing: spine"
tar zxf "$BUILD_DIR/download/spine-$SPINE_VERSION.tar.gz" -C "$BUILD_DIR/source" >> "$LOG_FILE" 2>&1 || fail "Error uncompress spine"
echo "Uncompressed: spine"

for ARCH in "${ARCHS[@]}"; do
    echo " "
    cd "$ROOT_DIR" || exit 1

    if [ -d "$BUILD_DIR/output/$ARCH" ]; then
        rm -rf "$BUILD_DIR/output/$ARCH"
    fi
    mkdir -p "$BUILD_DIR/output/$ARCH"
    cp -R "$BUILD_DIR/source/spine-runtimes-$SPINE_VERSION/spine-cpp/spine-cpp" "$BUILD_DIR/output/$ARCH"

    if [ -d "$BUILD_DIR/install/$ARCH" ]; then
        rm -rf "$BUILD_DIR/install/$ARCH"
    fi
    mkdir -p "$BUILD_DIR/install/$ARCH"

    PLATFORM="MacOSX"
    MIN_VERSION="-mmacosx-version-min"
    BUILD_SDKROOT="/Applications/Xcode.app/Contents/Developer/Platforms/$PLATFORM.platform/Developer/SDKs/${PLATFORM}${SDK_VERSION}.sdk"
    export CFLAGS="-arch $ARCH -pipe -isysroot $BUILD_SDKROOT $MIN_VERSION=10.12 -Ofast"
    export CXXFLAGS="$CFLAGS -std=c++14 -stdlib=libc++ -fno-exceptions -fno-rtti"
    export CXX="clang++"
    export AR="ar"

    cd "$ROOT_DIR/$BUILD_DIR/output/$ARCH" || exit 1
    if [ -d "$BUILD_DIR/download" ]; then
        rm -rf "$BUILD_DIR/download"
    fi

    echo "Compiling: spine $ARCH"
    files=()
    while IFS='' read -r line; do
        files+=("$line");
    done < <(find . -type f -name "*.cpp")

    includes=(
        "spine-cpp/include"
    )

    build_static_library "libspine" files[@] includes[@]
    echo "Compiled: spine $ARCH"

    echo " "
    echo "Installing: spine $ARCH"
    mkdir -p "$ROOT_DIR/$BUILD_DIR/install/$ARCH/lib"
    cp libspine.a "$ROOT_DIR/$BUILD_DIR/install/$ARCH/lib/libspine.a"
    mkdir -p "$ROOT_DIR/$BUILD_DIR/install/$ARCH/include"
    cp -R spine-cpp/include/spine "$ROOT_DIR/$BUILD_DIR/install/$ARCH/include"
    echo "Installed: spine $ARCH"
done

cd "$ROOT_DIR/$BUILD_DIR" || exit 1
if [ -f "libspine.a" ]; then
    rm -f "libspine.a"
fi
echo " "
echo "Creating Flat Lib: spine"
LIPO_CMD="lipo -create"
for ARCH in "${ARCHS[@]}"; do
    if [ -f "$ROOT_DIR/$BUILD_DIR/install/$ARCH/lib/libspine.a" ]; then
        LIPO_CMD="$LIPO_CMD $ROOT_DIR/$BUILD_DIR/install/$ARCH/lib/libspine.a"
    fi
done

LIPO_CMD="$LIPO_CMD -output libspine.a"
eval "$LIPO_CMD" >> "$LOG_FILE" 2>&1 || fail "Error creation flat spine"
echo "Created Flat Lib: spine"