b.sh

#!/bin/bash
CMAKE=1

# Check arguments
while test $# -gt 0
do
	case "$1" in
		--qt) echo "Qt enabled"
			QT=1
			CMAKE_ARGS="-DUSING_QT_UI=ON ${CMAKE_ARGS}"
			;;
		--qtbrew) echo "Qt enabled (homebrew)"
			QT=1
			CMAKE_ARGS="-DUSING_QT_UI=ON -DCMAKE_PREFIX_PATH=$(brew --prefix qt5) ${CMAKE_ARGS}"
			;;
		--ios) CMAKE_ARGS="-DCMAKE_TOOLCHAIN_FILE=cmake/Toolchains/ios.cmake ${CMAKE_ARGS}"
			TARGET_OS=iOS
			;;
		--ios-xcode) CMAKE_ARGS="-DCMAKE_TOOLCHAIN_FILE=cmake/Toolchains/ios.cmake -DIOS_PLATFORM=OS -GXcode ${CMAKE_ARGS}"
			TARGET_OS=iOS-xcode
			;;
		--fat) CMAKE_ARGS="-DCMAKE_OSX_ARCHITECTURES=arm64;x86_64 ${CMAKE_ARGS}"
			;;
		--x64) CMAKE_ARGS="-DCMAKE_OSX_ARCHITECTURES=x86_64 ${CMAKE_ARGS}"
			;;
		--arm64) CMAKE_ARGS="-DCMAKE_OSX_ARCHITECTURES=arm64 ${CMAKE_ARGS}"
			;;
		--no-png) CMAKE_ARGS="-DUSE_SYSTEM_LIBPNG=OFF ${CMAKE_ARGS}"
			;;
		--no-sdl2) CMAKE_ARGS="-DUSE_SYSTEM_LIBSDL2=OFF ${CMAKE_ARGS}"
			;;
		--rpi-armv6)
			CMAKE_ARGS="-DCMAKE_TOOLCHAIN_FILE=cmake/Toolchains/raspberry.armv6.cmake ${CMAKE_ARGS}"
			;;
		--rpi)
			CMAKE_ARGS="-DCMAKE_TOOLCHAIN_FILE=cmake/Toolchains/raspberry.armv7.cmake ${CMAKE_ARGS}"
			;;
		--rpi64)
			CMAKE_ARGS="-DCMAKE_TOOLCHAIN_FILE=cmake/Toolchains/raspberry.armv8.cmake ${CMAKE_ARGS}"
			;;
		--loongarch64)
			CMAKE_ARGS="-DCMAKE_TOOLCHAIN_FILE=cmake/Toolchains/loongarch64-linux-gnu.cmake -DHEADLESS=ON -DUSE_SYSTEM_LIBPNG=OFF -DUSE_SYSTEM_LIBSDL2=OFF ${CMAKE_ARGS}"
			TARGET_OS=loongarch64
			LOONGARCH64_BUILD=1
			;;
		--android) CMAKE_ARGS="-DCMAKE_TOOLCHAIN_FILE=android/android.toolchain.cmake ${CMAKE_ARGS}"
			TARGET_OS=Android
			PACKAGE=1
			;;
		--simulator) echo "Simulator mode enabled"
			CMAKE_ARGS="-DSIMULATOR=ON ${CMAKE_ARGS}"
			;;
		--release)
			CMAKE_ARGS="-DCMAKE_BUILD_TYPE=Release ${CMAKE_ARGS}"
			;;
		--debug)
			CMAKE_ARGS="-DCMAKE_BUILD_TYPE=Debug ${CMAKE_ARGS}"
			;;
		--reldebug)
			CMAKE_ARGS="-DCMAKE_BUILD_TYPE=RelWithDebInfo ${CMAKE_ARGS}"
			;;
		--headless) echo "Headless mode enabled"
			CMAKE_ARGS="-DHEADLESS=ON ${CMAKE_ARGS}"
			;;
		--atlas-tool) echo "Atlas tool enabled"
			CMAKE_ARGS="-DATLAS_TOOL=ON ${CMAKE_ARGS}"
			;;
		--libretro) echo "Build Libretro core"
			CMAKE_ARGS="-DLIBRETRO=ON ${CMAKE_ARGS}"
			;;
		--libretro_android) echo "Build Libretro Android core"
		        CMAKE_ARGS="-DLIBRETRO=ON -DCMAKE_TOOLCHAIN_FILE=${NDK}/build/cmake/android.toolchain.cmake -DANDROID_ABI=${APP_ABI} ${CMAKE_ARGS}"
			;;
		--unittest) echo "Build unittest"
			CMAKE_ARGS="-DUNITTEST=ON ${CMAKE_ARGS}"
			;;
		--no-package) echo "Packaging disabled"
			PACKAGE=0
			;;
		--clang) echo "Clang enabled"
			export CC=/usr/bin/clang
			export CXX=/usr/bin/clang++
			;;
		--sanitize) echo "Enabling address-sanitizer if available"
			CMAKE_ARGS="-DUSE_ASAN=ON ${CMAKE_ARGS}"
			;;
		--sanitizeub) echo "Enabling ub-sanitizer if available"
			CMAKE_ARGS="-DUSE_UBSAN=ON ${CMAKE_ARGS}"
			;;
		--gold) echo "Gold build enabled"
			CMAKE_ARGS="-DGOLD=ON ${CMAKE_ARGS}"
			;;
		--alderlake) echo "Alderlake opt"
			CMAKE_ARGS="-DCMAKE_C_FLAGS=\"-march=alderlake\" -DCMAKE_CPP_FLAGS=\"-march=alderlake\""
			;;
		--no_mmap) echo "Disable mmap"
			CMAKE_ARGS="-DUSE_NO_MMAP=ON ${CMAKE_ARGS}"
			;;
   		--gles) echo "Using GLES/EGL"
                	CMAKE_ARGS="-DUSING_GLES2=ON -DUSING_EGL=ON ${CMAKE_ARGS}"
                	;;
		*) MAKE_OPT="$1 ${MAKE_OPT}"
			;;
	esac
	shift
done

if [ ! -z "$TARGET_OS" ]; then
	echo "Building for $TARGET_OS"
	BUILD_DIR="$(tr [A-Z] [a-z] <<< build-"$TARGET_OS")"
else
	echo "Building for native host."
	BUILD_DIR="build"
fi

CORES_COUNT=4
if [[ "$OSTYPE" == "linux-gnu"* ]]; then
        CORES_COUNT="$(nproc)"
elif [[ "$OSTYPE" == "darwin"* ]]; then
        CORES_COUNT="$(sysctl -n hw.physicalcpu)"
fi

# Strict errors. Any non-zero return exits this script
set -e

echo Building with $CORES_COUNT threads

mkdir -p ${BUILD_DIR}

# For loongarch64 cross-compilation, build a comprehensive GL/GLX stub into
# <build>/stublibs/libGL.so so GLEW's static archive can resolve its symbols
# via PLT entries (a direct B26 branch to address 0 overflows on LoongArch).
# This stub is always (re)generated to pick up any new needed symbols.
if [ ! -z "$LOONGARCH64_BUILD" ]; then
	STUB_DIR=${BUILD_DIR}/stublibs
	STUB_GL=${STUB_DIR}/libGL.so
	mkdir -p "${STUB_DIR}"
	STUB_C=$(mktemp /tmp/gl_stub_XXXXXX.c)
	echo "/* Loongarch64 GL/GLX stub - cross-compilation only */" > "$STUB_C"
	# Collect all T (exported) symbols from GL/GLX libs, deduplicate, emit stubs
	{
		for lib in /usr/lib/x86_64-linux-gnu/libGL.so.1 \
		           /usr/lib/x86_64-linux-gnu/libGLX.so.0 \
		           /usr/lib/x86_64-linux-gnu/libGLdispatch.so.0; do
			[ -f "$lib" ] && nm -D "$lib" 2>/dev/null | awk '/^[0-9a-f]+ T /{ print $3 }'
		done
		# Always include the minimal GLX symbols GLEW directly references
		printf '%s\n' glXGetProcAddressARB glXGetClientString glXQueryVersion \
		              glBindTexture glGetString glGetIntegerv
	} | sort -u | awk '{ print "void "$1"(void){}" }' >> "$STUB_C"
	loongarch64-linux-gnu-gcc-14 -shared -fPIC -Wno-implicit-function-declaration \
		-o "${STUB_GL}" "$STUB_C"
	rm "$STUB_C"
fi

pushd ${BUILD_DIR}

cmake $CMAKE_ARGS ..
make -j$CORES_COUNT $MAKE_OPT
popd