init/Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 #
   3 # Makefile for the linux kernel.
   4 #
   5
   6 ccflags-y := -fno-function-sections -fno-data-sections
   7
   8 obj-y                          := main.o version.o mounts.o
   9 ifneq ($(CONFIG_BLK_DEV_INITRD),y)
  10 obj-y                          += noinitramfs.o
  11 else
  12 obj-$(CONFIG_BLK_DEV_INITRD)   += initramfs.o
  13 endif
  14 obj-$(CONFIG_GENERIC_CALIBRATE_DELAY) += calibrate.o
  15
  16 obj-y                          += init_task.o
  17
  18 mounts-y                        := do_mounts.o
  19 mounts-$(CONFIG_BLK_DEV_RAM)    += do_mounts_rd.o
  20 mounts-$(CONFIG_BLK_DEV_INITRD) += do_mounts_initrd.o
  21
  22 #
  23 # UTS_VERSION
  24 #
  25
  26 smp-flag-$(CONFIG_SMP)                  := SMP
  27 preempt-flag-$(CONFIG_PREEMPT_BUILD)    := PREEMPT
  28 preempt-flag-$(CONFIG_PREEMPT_DYNAMIC)  := PREEMPT_DYNAMIC
  29 preempt-flag-$(CONFIG_PREEMPT_RT)       := PREEMPT_RT
  30
  31 build-version = $(or $(KBUILD_BUILD_VERSION), $(build-version-auto))
  32 build-timestamp = $(or $(KBUILD_BUILD_TIMESTAMP), $(build-timestamp-auto))
  33
  34 # Maximum length of UTS_VERSION is 64 chars
  35 filechk_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_VERSION
  41 #
  42
  43 $(obj)/utsversion-tmp.h: FORCE
  44         $(call filechk,uts_version)
  45
  46 clean-files += utsversion-tmp.h
  47
  48 $(obj)/version.o: $(obj)/utsversion-tmp.h
  49 CFLAGS_version.o := -include $(obj)/utsversion-tmp.h
  50
  51 #
  52 # Build version-timestamp.c with final UTS_VERSION
  53 #
  54
  55 include/generated/utsversion.h: build-version-auto = $(shell $(srctree)/$(src)/build-version)
  56 include/generated/utsversion.h: build-timestamp-auto = $(shell LC_ALL=C date)
  57 include/generated/utsversion.h: FORCE
  58         $(call filechk,uts_version)
  59
  60 $(obj)/version-timestamp.o: include/generated/utsversion.h
  61 CFLAGS_version-timestamp.o := -include include/generated/utsversion.h