linux/init/Makefile
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   1# SPDX-License-Identifier: GPL-2.0
   2#
   3# Makefile for the linux kernel.
   4#
   5
   6ccflags-y := -fno-function-sections -fno-data-sections
   7
   8obj-y                          := main.o version.o mounts.o
   9ifneq ($(CONFIG_BLK_DEV_INITRD),y)
  10obj-y                          += noinitramfs.o
  11else
  12obj-$(CONFIG_BLK_DEV_INITRD)   += initramfs.o
  13endif
  14obj-$(CONFIG_GENERIC_CALIBRATE_DELAY) += calibrate.o
  15
  16obj-y                          += init_task.o
  17
  18mounts-y                        := do_mounts.o
  19mounts-$(CONFIG_BLK_DEV_RAM)    += do_mounts_rd.o
  20mounts-$(CONFIG_BLK_DEV_INITRD) += do_mounts_initrd.o
  21
  22#
  23# UTS_VERSION
  24#
  25
  26smp-flag-$(CONFIG_SMP)                  := SMP
  27preempt-flag-$(CONFIG_PREEMPT_BUILD)    := PREEMPT
  28preempt-flag-$(CONFIG_PREEMPT_DYNAMIC)  := PREEMPT_DYNAMIC
  29preempt-flag-$(CONFIG_PREEMPT_RT)       := PREEMPT_RT
  30
  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 chars
  35filechk_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        $(call filechk,uts_version)
  45
  46clean-files += utsversion-tmp.h
  47
  48$(obj)/version.o: $(obj)/utsversion-tmp.h
  49CFLAGS_version.o := -include $(obj)/utsversion-tmp.h
  50
  51#
  52# Build version-timestamp.c with final UTS_VERSION
  53#
  54
  55include/generated/utsversion.h: build-version-auto = $(shell $(srctree)/$(src)/build-version)
  56include/generated/utsversion.h: build-timestamp-auto = $(shell LC_ALL=C date)
  57include/generated/utsversion.h: FORCE
  58        $(call filechk,uts_version)
  59
  60$(obj)/version-timestamp.o: include/generated/utsversion.h
  61CFLAGS_version-timestamp.o := -include include/generated/utsversion.h
  62KASAN_SANITIZE_version-timestamp.o := n
  63KCSAN_SANITIZE_version-timestamp.o := n
  64GCOV_PROFILE_version-timestamp.o := n
  65