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- # SPDX-License-Identifier: GPL-2.0
- #
- # Makefile for the linux kernel.
- #
- ccflags-y := -fno-function-sections -fno-data-sections
- obj-y := main.o version.o mounts.o
- ifneq ($(CONFIG_BLK_DEV_INITRD),y)
- obj-y += noinitramfs.o
- else
- obj-$(CONFIG_BLK_DEV_INITRD) += initramfs.o
- endif
- obj-$(CONFIG_GENERIC_CALIBRATE_DELAY) += calibrate.o
- obj-y += init_task.o
- mounts-y := do_mounts.o
- mounts-$(CONFIG_BLK_DEV_RAM) += do_mounts_rd.o
- mounts-$(CONFIG_BLK_DEV_INITRD) += do_mounts_initrd.o
- #
- # UTS_VERSION
- #
- smp-flag-$(CONFIG_SMP) := SMP
- preempt-flag-$(CONFIG_PREEMPT_BUILD) := PREEMPT
- preempt-flag-$(CONFIG_PREEMPT_DYNAMIC) := PREEMPT_DYNAMIC
- preempt-flag-$(CONFIG_PREEMPT_RT) := PREEMPT_RT
- build-version = $(or $(KBUILD_BUILD_VERSION), $(build-version-auto))
- build-timestamp = $(or $(KBUILD_BUILD_TIMESTAMP), $(build-timestamp-auto))
- # Maximum length of UTS_VERSION is 64 chars
- filechk_uts_version = \
- utsver=$$(echo '$(pound)'"$(build-version)" $(smp-flag-y) $(preempt-flag-y) "$(build-timestamp)" | cut -b -64); \
- echo '$(pound)'define UTS_VERSION \""$${utsver}"\"
- #
- # Build version.c with temporary UTS_VERSION
- #
- $(obj)/utsversion-tmp.h: FORCE
- $(call filechk,uts_version)
- clean-files += utsversion-tmp.h
- $(obj)/version.o: $(obj)/utsversion-tmp.h
- CFLAGS_version.o := -include $(obj)/utsversion-tmp.h
- #
- # Build version-timestamp.c with final UTS_VERSION
- #
- include/generated/utsversion.h: build-version-auto = $(shell $(srctree)/scripts/build-version)
- include/generated/utsversion.h: build-timestamp-auto = $(shell LC_ALL=C date)
- include/generated/utsversion.h: FORCE
- $(call filechk,uts_version)
- $(obj)/version-timestamp.o: include/generated/utsversion.h
- CFLAGS_version-timestamp.o := -include include/generated/utsversion.h
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