1ifndef ARCH_arm64_TOOLCHAIN_INCLUDED 2ARCH_arm64_TOOLCHAIN_INCLUDED := 1 3 4ifndef ARCH_arm64_TOOLCHAIN_PREFIX 5ARCH_arm64_TOOLCHAIN_PREFIX := aarch64-elf- 6FOUNDTOOL=$(shell which $(ARCH_arm64_TOOLCHAIN_PREFIX)gcc) 7ifeq ($(FOUNDTOOL),) 8ARCH_arm64_TOOLCHAIN_PREFIX := aarch64-linux-android- 9FOUNDTOOL=$(shell which $(ARCH_arm64_TOOLCHAIN_PREFIX)gcc) 10ifeq ($(FOUNDTOOL),) 11$(warning cannot find toolchain in path, assuming aarch64-elf- prefix) 12ARCH_arm64_TOOLCHAIN_PREFIX := aarch64-elf- 13endif 14endif 15endif 16endif 17