Script to compile spine runtime static library for emscripten

build_spine_emscripten.sh

#!/bin/bash

SPINE_VERSION="3.7.83"

ROOT_DIR=$(pwd)
WORKER=$(getconf _NPROCESSORS_ONLN)
BUILD_DIR="build/emscripten/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"

echo " "
cd "$ROOT_DIR" || exit 1

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

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

export CFLAGS="-m32 -Os"
export CXXFLAGS="$CFLAGS -std=c++14 -stdlib=libc++ -fno-exceptions -fno-rtti"
export CXX="em++"
export AR="emar"

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

echo "Compiling: spine emscripten"
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 emscripten"

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