1 # SPDX-License-Identifier: GPL-2.0 1 # SPDX-License-Identifier: GPL-2.0
2 # 2 #
3 # Makefile for the linux kernel. 3 # Makefile for the linux kernel.
4 # 4 #
5 5
6 ccflags-y := -fno-function-sections -fno-data- 6 ccflags-y := -fno-function-sections -fno-data-sections
7 7
8 obj-y := main.o versi 8 obj-y := main.o version.o mounts.o
9 ifneq ($(CONFIG_BLK_DEV_INITRD),y) 9 ifneq ($(CONFIG_BLK_DEV_INITRD),y)
10 obj-y += noinitramfs. 10 obj-y += noinitramfs.o
11 else 11 else
12 obj-$(CONFIG_BLK_DEV_INITRD) += initramfs.o 12 obj-$(CONFIG_BLK_DEV_INITRD) += initramfs.o
13 endif 13 endif
14 obj-$(CONFIG_GENERIC_CALIBRATE_DELAY) += calib 14 obj-$(CONFIG_GENERIC_CALIBRATE_DELAY) += calibrate.o
15 15
16 obj-y += init_task.o 16 obj-y += init_task.o
17 17
18 mounts-y := do_mounts.o 18 mounts-y := do_mounts.o
19 mounts-$(CONFIG_BLK_DEV_RAM) += do_mounts_r 19 mounts-$(CONFIG_BLK_DEV_RAM) += do_mounts_rd.o
20 mounts-$(CONFIG_BLK_DEV_INITRD) += do_mounts_i 20 mounts-$(CONFIG_BLK_DEV_INITRD) += do_mounts_initrd.o
21 21
22 # !! 22 # dependencies on generated files need to be listed explicitly
23 # UTS_VERSION !! 23 $(obj)/version.o: include/generated/compile.h
24 # <<
25 24
26 smp-flag-$(CONFIG_SMP) := SMP !! 25 # compile.h changes depending on hostname, generation number, etc,
27 preempt-flag-$(CONFIG_PREEMPT_BUILD) := PRE !! 26 # so we regenerate it always.
28 preempt-flag-$(CONFIG_PREEMPT_DYNAMIC) := PRE !! 27 # mkcompile_h will make sure to only update the
29 preempt-flag-$(CONFIG_PREEMPT_RT) := PRE !! 28 # actual file if its content has changed.
30 !! 29
31 build-version = $(or $(KBUILD_BUILD_VERSION), !! 30 chk_compile.h = :
32 build-timestamp = $(or $(KBUILD_BUILD_TIMESTAM !! 31 quiet_chk_compile.h = echo ' CHK $@'
33 !! 32 silent_chk_compile.h = :
34 # Maximum length of UTS_VERSION is 64 chars !! 33 include/generated/compile.h: FORCE
35 filechk_uts_version = \ !! 34 @$($(quiet)chk_compile.h)
36 utsver=$$(echo '$(pound)'"$(build-vers !! 35 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkcompile_h $@ \
37 echo '$(pound)'define UTS_VERSION \""$ !! 36 "$(UTS_MACHINE)" "$(CONFIG_SMP)" "$(CONFIG_PREEMPT)" \
38 !! 37 "$(CONFIG_PREEMPT_RT)" $(CONFIG_CC_VERSION_TEXT) "$(LD)"
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 <<
50 <<
51 # <<
52 # Build version-timestamp.c with final UTS_VER <<
53 # <<
54 <<
55 include/generated/utsversion.h: build-version- <<
56 include/generated/utsversion.h: build-timestam <<
57 include/generated/utsversion.h: FORCE <<
58 $(call filechk,uts_version) <<
59 <<
60 $(obj)/version-timestamp.o: include/generated/ <<
61 CFLAGS_version-timestamp.o := -include include <<
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