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1# SPDX-License-Identifier: GPL-2.02#3# Makefile for the linux kernel.4#5 6ccflags-y := -fno-function-sections -fno-data-sections7 8obj-y := main.o version.o mounts.o9ifneq ($(CONFIG_BLK_DEV_INITRD),y)10obj-y += noinitramfs.o11else12obj-$(CONFIG_BLK_DEV_INITRD) += initramfs.o13endif14obj-$(CONFIG_GENERIC_CALIBRATE_DELAY) += calibrate.o15 16obj-y += init_task.o17 18mounts-y := do_mounts.o19mounts-$(CONFIG_BLK_DEV_RAM) += do_mounts_rd.o20mounts-$(CONFIG_BLK_DEV_INITRD) += do_mounts_initrd.o21 22#23# UTS_VERSION24#25 26smp-flag-$(CONFIG_SMP) := SMP27preempt-flag-$(CONFIG_PREEMPT_BUILD) := PREEMPT28preempt-flag-$(CONFIG_PREEMPT_DYNAMIC) := PREEMPT_DYNAMIC29preempt-flag-$(CONFIG_PREEMPT_RT) := PREEMPT_RT30 31build-version = $(or $(KBUILD_BUILD_VERSION), $(build-version-auto))32build-timestamp = $(or $(KBUILD_BUILD_TIMESTAMP), $(build-timestamp-auto))33 34# Maximum length of UTS_VERSION is 64 chars35filechk_uts_version = \36 utsver=$$(echo '$(pound)'"$(build-version)" $(smp-flag-y) $(preempt-flag-y) "$(build-timestamp)" | cut -b -64); \37 echo '$(pound)'define UTS_VERSION \""$${utsver}"\"38 39#40# Build version.c with temporary UTS_VERSION41#42 43$(obj)/utsversion-tmp.h: FORCE44 $(call filechk,uts_version)45 46clean-files += utsversion-tmp.h47 48$(obj)/version.o: $(obj)/utsversion-tmp.h49CFLAGS_version.o := -include $(obj)/utsversion-tmp.h50 51#52# Build version-timestamp.c with final UTS_VERSION53#54 55include/generated/utsversion.h: build-version-auto = $(shell $(srctree)/scripts/build-version)56include/generated/utsversion.h: build-timestamp-auto = $(shell LC_ALL=C date)57include/generated/utsversion.h: FORCE58 $(call filechk,uts_version)59 60$(obj)/version-timestamp.o: include/generated/utsversion.h61CFLAGS_version-timestamp.o := -include include/generated/utsversion.h62