NDK_ROOT := $(shell dirname $(CC))/../../../../..

ifeq "$(findstring 64, $(ARCH))" "64"
	# lowest 64-bit API level
	API_LEVEL := 21
else ifeq "$(ARCH)" "i386"
	# clone(2) declaration is present only since this api level
	API_LEVEL := 17
else
	# lowest supported 32-bit API level
	API_LEVEL := 9
endif

ifeq "$(ARCH)" "arm"
	SYSROOT_ARCH := arm
	STL_ARCH := armeabi-v7a
	ARCH_CFLAGS += -march=armv7-a -mfloat-abi=softfp -mfpu=vfpv3-d16 -marm
else ifeq "$(ARCH)" "aarch64"
	SYSROOT_ARCH := arm64
	STL_ARCH := arm64-v8a
else ifeq "$(ARCH)" "i386"
	SYSROOT_ARCH := x86
	STL_ARCH := x86
else ifeq "$(ARCH)" "mips64r6"
	SYSROOT_ARCH := mips64
	STL_ARCH := mips64
else ifeq "$(ARCH)" "mips32"
	SYSROOT_ARCH := mips
	STL_ARCH := mips
else
	SYSROOT_ARCH := $(ARCH)
	STL_ARCH := $(ARCH)
endif

ARCH_CFLAGS += \
	--sysroot=$(NDK_ROOT)/platforms/android-$(API_LEVEL)/arch-$(SYSROOT_ARCH) \
	-isystem $(NDK_ROOT)/sources/cxx-stl/gnu-libstdc++/4.9/include \
	-isystem $(NDK_ROOT)/sources/cxx-stl/gnu-libstdc++/4.9/libs/$(STL_ARCH)/include \
	-isystem $(NDK_ROOT)/sources/cxx-stl/gnu-libstdc++/4.9/include/backward
ARCH_LDFLAGS += -lm \
	$(NDK_ROOT)/sources/cxx-stl/gnu-libstdc++/4.9/libs/$(STL_ARCH)/libgnustl_static.a \
	--sysroot=$(NDK_ROOT)/platforms/android-$(API_LEVEL)/arch-$(SYSROOT_ARCH)