[linux-2.6-block.git] / Kbuild

#
# Kbuild for top-level directory of the kernel
# This file takes care of the following:
# 1) Generate bounds.h
# 2) Generate timeconst.h
# 3) Generate asm-offsets.h (may need bounds.h and timeconst.h)
# 4) Check for missing system calls

# Default sed regexp - multiline due to syntax constraints
define sed-y
	"/^->/{s:->#\(.*\):/* \1 */:; \
	s:^->\([^ ]*\) [\$$#]*\([-0-9]*\) \(.*\):#define \1 \2 /* \3 */:; \
	s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
	s:->::; p;}"
endef

# Use filechk to avoid rebuilds when a header changes, but the resulting file
# does not
define filechk_offsets
	(set -e; \
	 echo "#ifndef $2"; \
	 echo "#define $2"; \
	 echo "/*"; \
	 echo " * DO NOT MODIFY."; \
	 echo " *"; \
	 echo " * This file was generated by Kbuild"; \
	 echo " */"; \
	 echo ""; \
	 sed -ne $(sed-y); \
	 echo ""; \
	 echo "#endif" )
endef

#####
# 1) Generate bounds.h

bounds-file := include/generated/bounds.h

always  := $(bounds-file)
targets := kernel/bounds.s

# We use internal kbuild rules to avoid the "is up to date" message from make
kernel/bounds.s: kernel/bounds.c FORCE
	$(Q)mkdir -p $(dir $@)
	$(call if_changed_dep,cc_s_c)

$(obj)/$(bounds-file): kernel/bounds.s FORCE
	$(call filechk,offsets,__LINUX_BOUNDS_H__)

#####
# 2) Generate timeconst.h

timeconst-file := include/generated/timeconst.h

targets += $(timeconst-file)

quiet_cmd_gentimeconst = GEN     $@
define cmd_gentimeconst
	(echo $(CONFIG_HZ) | bc -q $< ) > $@
endef
define filechk_gentimeconst
	(echo $(CONFIG_HZ) | bc -q $< )
endef

$(obj)/$(timeconst-file): kernel/time/timeconst.bc FORCE
	$(call filechk,gentimeconst)

#####
# 3) Generate asm-offsets.h
#

offsets-file := include/generated/asm-offsets.h

always  += $(offsets-file)
targets += arch/$(SRCARCH)/kernel/asm-offsets.s

# We use internal kbuild rules to avoid the "is up to date" message from make
arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \
                                      $(obj)/$(timeconst-file) $(obj)/$(bounds-file) FORCE
	$(Q)mkdir -p $(dir $@)
	$(call if_changed_dep,cc_s_c)

$(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE
	$(call filechk,offsets,__ASM_OFFSETS_H__)

#####
# 4) Check for missing system calls
#

always += missing-syscalls
targets += missing-syscalls

quiet_cmd_syscalls = CALL    $<
      cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags)

missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE
	$(call cmd,syscalls)

# Keep these three files during make clean
no-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file)
Commit	Line	Data
86feeaa8 SR	1	#
	2	# Kbuild for top-level directory of the kernel
	3	# This file takes care of the following:
1cdf25d7	4	# 1) Generate bounds.h
0a227985 NMG	5	# 2) Generate timeconst.h
	6	# 3) Generate asm-offsets.h (may need bounds.h and timeconst.h)
	7	# 4) Check for missing system calls
86feeaa8	8
39664e2f MY	9	# Default sed regexp - multiline due to syntax constraints
	10	define sed-y
	11	"/^->/{s:->#\(.\):/ \1 */:; \
	12	s:^->\([^ ]\) [\$$#]\([-0-9]\) \(.\):#define \1 \2 /* \3 */:; \
	13	s:^->\([^ ]\) [\$$#]\([^ ]\) \(.\):#define \1 \2 /* \3 */:; \
	14	s:->::; p;}"
	15	endef
1cdf25d7	16
70a4fd6c MM	17	# Use filechk to avoid rebuilds when a header changes, but the resulting file
	18	# does not
	19	define filechk_offsets
1cdf25d7	20	(set -e; \
39664e2f MY	21	echo "#ifndef $2"; \
39664e2f MY	22	echo "#define $2"; \
1cdf25d7 CL	23	echo "/*"; \
	24	echo " * DO NOT MODIFY."; \
	25	echo " *"; \
	26	echo " * This file was generated by Kbuild"; \
1cdf25d7 CL	27	echo " */"; \
1cdf25d7 CL	28	echo ""; \
70a4fd6c	29	sed -ne $(sed-y); \
1cdf25d7	30	echo ""; \
70a4fd6c	31	echo "#endif" )
1cdf25d7 CL	32	endef
1cdf25d7 CL	33
39664e2f MY	34	#####
	35	# 1) Generate bounds.h
	36
	37	bounds-file := include/generated/bounds.h
	38
	39	always := $(bounds-file)
8a58e162	40	targets := kernel/bounds.s
39664e2f	41
1cdf25d7 CL	42	# We use internal kbuild rules to avoid the "is up to date" message from make
	43	kernel/bounds.s: kernel/bounds.c FORCE
	44	$(Q)mkdir -p $(dir $@)
	45	$(call if_changed_dep,cc_s_c)
	46
70a4fd6c MM	47	$(obj)/$(bounds-file): kernel/bounds.s FORCE
70a4fd6c MM	48	$(call filechk,offsets,__LINUX_BOUNDS_H__)
1cdf25d7 CL	49
1cdf25d7 CL	50	#####
0a227985 NMG	51	# 2) Generate timeconst.h
	52
	53	timeconst-file := include/generated/timeconst.h
	54
0a227985 NMG	55	targets += $(timeconst-file)
	56
	57	quiet_cmd_gentimeconst = GEN $@
	58	define cmd_gentimeconst
	59	(echo $(CONFIG_HZ) \| bc -q $< ) > $@
	60	endef
	61	define filechk_gentimeconst
	62	(echo $(CONFIG_HZ) \| bc -q $< )
	63	endef
	64
	65	$(obj)/$(timeconst-file): kernel/time/timeconst.bc FORCE
	66	$(call filechk,gentimeconst)
	67
	68	#####
	69	# 3) Generate asm-offsets.h
86feeaa8 SR	70	#
86feeaa8 SR	71
559df2e0	72	offsets-file := include/generated/asm-offsets.h
86feeaa8	73
1cdf25d7	74	always += $(offsets-file)
6752ed90	75	targets += arch/$(SRCARCH)/kernel/asm-offsets.s
1cdf25d7	76
86feeaa8	77	# We use internal kbuild rules to avoid the "is up to date" message from make
1cdf25d7	78	arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \
0a227985	79	$(obj)/$(timeconst-file) $(obj)/$(bounds-file) FORCE
86feeaa8 SR	80	$(Q)mkdir -p $(dir $@)
	81	$(call if_changed_dep,cc_s_c)
	82
70a4fd6c MM	83	$(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE
70a4fd6c MM	84	$(call filechk,offsets,__ASM_OFFSETS_H__)
86feeaa8	85
c53aeca0	86	#####
0a227985	87	# 4) Check for missing system calls
c53aeca0 SR	88	#
c53aeca0 SR	89
5f7efb4c AL	90	always += missing-syscalls
	91	targets += missing-syscalls
	92
c53aeca0	93	quiet_cmd_syscalls = CALL $<
44656fa0	94	cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags)
c53aeca0	95
5f7efb4c	96	missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE
c53aeca0	97	$(call cmd,syscalls)
1cdf25d7	98
0a227985 NMG	99	# Keep these three files during make clean
0a227985 NMG	100	no-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file)