[net-next-2.6.git] / scripts / Makefile.build

# ==========================================================================
# Building
# ==========================================================================

src := $(obj)

PHONY := __build
__build:

# Init all relevant variables used in kbuild files so
# 1) they have correct type
# 2) they do not inherit any value from the environment
obj-y :=
obj-m :=
lib-y :=
lib-m :=
always :=
targets :=
subdir-y :=
subdir-m :=
EXTRA_AFLAGS   :=
EXTRA_CFLAGS   :=
EXTRA_CPPFLAGS :=
EXTRA_LDFLAGS  :=
asflags-y  :=
ccflags-y  :=
cppflags-y :=
ldflags-y  :=

# Read auto.conf if it exists, otherwise ignore
-include include/config/auto.conf

include scripts/Kbuild.include

# For backward compatibility check that these variables do not change
save-cflags := $(CFLAGS)

# The filename Kbuild has precedence over Makefile
kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
include $(kbuild-file)

# If the save-* variables changed error out
ifeq ($(KBUILD_NOPEDANTIC),)
        ifneq ("$(save-cflags)","$(CFLAGS)")
                $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use EXTRA_CFLAGS)
        endif
endif
include scripts/Makefile.lib

ifdef host-progs
ifneq ($(hostprogs-y),$(host-progs))
$(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
hostprogs-y += $(host-progs)
endif
endif

# Do not include host rules unless needed
ifneq ($(hostprogs-y)$(hostprogs-m),)
include scripts/Makefile.host
endif

ifneq ($(KBUILD_SRC),)
# Create output directory if not already present
_dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))

# Create directories for object files if directory does not exist
# Needed when obj-y := dir/file.o syntax is used
_dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d)))
endif

ifndef obj
$(warning kbuild: Makefile.build is included improperly)
endif

# ===========================================================================

ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),)
lib-target := $(obj)/lib.a
endif

ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(lib-target)),)
builtin-target := $(obj)/built-in.o
endif

modorder-target := $(obj)/modules.order

# We keep a list of all modules in $(MODVERDIR)

__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
	 $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
	 $(subdir-ym) $(always)
	@:

# Linus' kernel sanity checking tool
ifneq ($(KBUILD_CHECKSRC),0)
  ifeq ($(KBUILD_CHECKSRC),2)
    quiet_cmd_force_checksrc = CHECK   $<
          cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
  else
      quiet_cmd_checksrc     = CHECK   $<
            cmd_checksrc     = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
  endif
endif

# Do section mismatch analysis for each module/built-in.o
ifdef CONFIG_DEBUG_SECTION_MISMATCH
  cmd_secanalysis = ; scripts/mod/modpost $@
endif

# Compile C sources (.c)
# ---------------------------------------------------------------------------

# Default is built-in, unless we know otherwise
modkern_cflags := $(CFLAGS_KERNEL)
quiet_modtag := $(empty)   $(empty)

$(real-objs-m)        : modkern_cflags := $(CFLAGS_MODULE)
$(real-objs-m:.o=.i)  : modkern_cflags := $(CFLAGS_MODULE)
$(real-objs-m:.o=.s)  : modkern_cflags := $(CFLAGS_MODULE)
$(real-objs-m:.o=.lst): modkern_cflags := $(CFLAGS_MODULE)

$(real-objs-m)        : quiet_modtag := [M]
$(real-objs-m:.o=.i)  : quiet_modtag := [M]
$(real-objs-m:.o=.s)  : quiet_modtag := [M]
$(real-objs-m:.o=.lst): quiet_modtag := [M]

$(obj-m)              : quiet_modtag := [M]

# Default for not multi-part modules
modname = $(basetarget)

$(multi-objs-m)         : modname = $(modname-multi)
$(multi-objs-m:.o=.i)   : modname = $(modname-multi)
$(multi-objs-m:.o=.s)   : modname = $(modname-multi)
$(multi-objs-m:.o=.lst) : modname = $(modname-multi)
$(multi-objs-y)         : modname = $(modname-multi)
$(multi-objs-y:.o=.i)   : modname = $(modname-multi)
$(multi-objs-y:.o=.s)   : modname = $(modname-multi)
$(multi-objs-y:.o=.lst) : modname = $(modname-multi)

quiet_cmd_cc_s_c = CC $(quiet_modtag)  $@
cmd_cc_s_c       = $(CC) $(c_flags) -fverbose-asm -S -o $@ $<

$(obj)/%.s: $(src)/%.c FORCE
	$(call if_changed_dep,cc_s_c)

quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@
cmd_cc_i_c       = $(CPP) $(c_flags)   -o $@ $<

$(obj)/%.i: $(src)/%.c FORCE
	$(call if_changed_dep,cc_i_c)

cmd_genksyms =                                                              \
    $(CPP) -D__GENKSYMS__ $(c_flags) $< |                                   \
    $(GENKSYMS) -T $@ -A -a $(ARCH)                                         \
     $(if $(KBUILD_PRESERVE),-p)                                            \
     $(if $(1),-r $(firstword $(wildcard $(@:.symtypes=.symref) /dev/null)))

quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
cmd_cc_symtypes_c =                                                         \
    set -e;                                                                 \
    $(call cmd_genksyms, true) >/dev/null;                                  \
    test -s $@ || rm -f $@

$(obj)/%.symtypes : $(src)/%.c FORCE
	$(call cmd,cc_symtypes_c)

# C (.c) files
# The C file is compiled and updated dependency information is generated.
# (See cmd_cc_o_c + relevant part of rule_cc_o_c)

quiet_cmd_cc_o_c = CC $(quiet_modtag)  $@

ifndef CONFIG_MODVERSIONS
cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<

else
# When module versioning is enabled the following steps are executed:
# o compile a .tmp_<file>.s from <file>.c
# o if .tmp_<file>.s doesn't contain a __ksymtab version, i.e. does
#   not export symbols, we just assemble .tmp_<file>.s to <file>.o and
#   are done.
# o otherwise, we calculate symbol versions using the good old
#   genksyms on the preprocessed source and postprocess them in a way
#   that they are usable as assembly source
# o assemble <file>.o from .tmp_<file>.s forcing inclusion of directives
#   defining the actual values of __crc_*, followed by objcopy-ing them
#   to force these symbols to be local to permit stripping them later.
s_file = $(@D)/.tmp_$(@F:.o=.s)
v_file = $(@D)/.tmp_$(@F:.o=.v)
tmp_o_file = $(@D)/.tmp_$(@F)
no_g_c_flags = $(filter-out -g%,$(c_flags))

cmd_cc_o_c = $(CC) $(c_flags) -S -o $(s_file) $<

cmd_modversions =							\
	if grep -q __ksymtab $(s_file); then				\
		if $(call cmd_genksyms, $(KBUILD_SYMTYPES)) > $(v_file) \
		   && $(CC) $(no_g_c_flags) -c -Wa,$(v_file)		\
			    -o $(tmp_o_file) $(s_file)			\
		   && $(OBJCOPY) -L '__crc_*' -L '___crc_*' -w		\
				 $(tmp_o_file) $@;			\
		then							\
			: ;						\
		else							\
			rm -f $@; exit 1;				\
		fi;							\
	else								\
		rm -f $(v_file);					\
		$(CC) $(no_g_c_flags) -c -o $@ $(s_file);		\
	fi;
endif

ifdef CONFIG_FTRACE_MCOUNT_RECORD
cmd_record_mcount = perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
	"$(if $(CONFIG_64BIT),64,32)" \
	"$(OBJDUMP)" "$(OBJCOPY)" "$(CC)" "$(LD)" "$(NM)" "$(RM)" "$(MV)" "$(@)";
endif

define rule_cc_o_c
	$(call echo-cmd,checksrc) $(cmd_checksrc)			  \
	$(call echo-cmd,cc_o_c) $(cmd_cc_o_c);				  \
	$(cmd_modversions)						  \
	$(cmd_record_mcount)						  \
	scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' >    \
	                                              $(dot-target).tmp;  \
	if [ -r $(@D)/.tmp_$(@F:.o=.v) ]; then				  \
		echo >> $(dot-target).tmp;				  \
		echo '$@: $(GENKSYMS)' >> $(dot-target).tmp;		  \
		echo '$(GENKSYMS):: ;' >> $(dot-target).tmp;		  \
	fi;								  \
	rm -f $(depfile) $(@D)/.tmp_$(@F:.o=.?);			  \
	mv -f $(dot-target).tmp $(dot-target).cmd
endef

# Built-in and composite module parts
$(obj)/%.o: $(src)/%.c FORCE
	$(call cmd,force_checksrc)
	$(call if_changed_rule,cc_o_c)

# Single-part modules are special since we need to mark them in $(MODVERDIR)

$(single-used-m): $(obj)/%.o: $(src)/%.c FORCE
	$(call cmd,force_checksrc)
	$(call if_changed_rule,cc_o_c)
	@{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)

quiet_cmd_cc_lst_c = MKLST   $@
      cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
		     $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
				     System.map $(OBJDUMP) > $@

$(obj)/%.lst: $(src)/%.c FORCE
	$(call if_changed_dep,cc_lst_c)

# Compile assembler sources (.S)
# ---------------------------------------------------------------------------

modkern_aflags := $(AFLAGS_KERNEL)

$(real-objs-m)      : modkern_aflags := $(AFLAGS_MODULE)
$(real-objs-m:.o=.s): modkern_aflags := $(AFLAGS_MODULE)

quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
cmd_as_s_S       = $(CPP) $(a_flags)   -o $@ $< 

$(obj)/%.s: $(src)/%.S FORCE
	$(call if_changed_dep,as_s_S)

quiet_cmd_as_o_S = AS $(quiet_modtag)  $@
cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<

$(obj)/%.o: $(src)/%.S FORCE
	$(call if_changed_dep,as_o_S)

targets += $(real-objs-y) $(real-objs-m) $(lib-y)
targets += $(extra-y) $(MAKECMDGOALS) $(always)

# Linker scripts preprocessor (.lds.S -> .lds)
# ---------------------------------------------------------------------------
quiet_cmd_cpp_lds_S = LDS     $@
      cmd_cpp_lds_S = $(CPP) $(cpp_flags) -D__ASSEMBLY__ -o $@ $<

$(obj)/%.lds: $(src)/%.lds.S FORCE
	$(call if_changed_dep,cpp_lds_S)

# Build the compiled-in targets
# ---------------------------------------------------------------------------

# To build objects in subdirs, we need to descend into the directories
$(sort $(subdir-obj-y)): $(subdir-ym) ;

#
# Rule to compile a set of .o files into one .o file
#
ifdef builtin-target
quiet_cmd_link_o_target = LD      $@
# If the list of objects to link is empty, just create an empty built-in.o
cmd_link_o_target = $(if $(strip $(obj-y)),\
		      $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \
		      $(cmd_secanalysis),\
		      rm -f $@; $(AR) rcs $@)

$(builtin-target): $(obj-y) FORCE
	$(call if_changed,link_o_target)

targets += $(builtin-target)
endif # builtin-target

#
# Rule to create modules.order file
#
# Create commands to either record .ko file or cat modules.order from
# a subdirectory
modorder-cmds =						\
	$(foreach m, $(modorder),			\
		$(if $(filter %/modules.order, $m),	\
			cat $m;, echo kernel/$m;))

$(modorder-target): $(subdir-ym) FORCE
	$(Q)(cat /dev/null; $(modorder-cmds)) > $@

#
# Rule to compile a set of .o files into one .a file
#
ifdef lib-target
quiet_cmd_link_l_target = AR      $@
cmd_link_l_target = rm -f $@; $(AR) rcs $@ $(lib-y)

$(lib-target): $(lib-y) FORCE
	$(call if_changed,link_l_target)

targets += $(lib-target)
endif

#
# Rule to link composite objects
#
#  Composite objects are specified in kbuild makefile as follows:
#    <composite-object>-objs := <list of .o files>
#  or
#    <composite-object>-y    := <list of .o files>
link_multi_deps =                     \
$(filter $(addprefix $(obj)/,         \
$($(subst $(obj)/,,$(@:.o=-objs)))    \
$($(subst $(obj)/,,$(@:.o=-y)))), $^)
 
quiet_cmd_link_multi-y = LD      $@
cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)

quiet_cmd_link_multi-m = LD [M]  $@
cmd_link_multi-m = $(cmd_link_multi-y)

# We would rather have a list of rules like
# 	foo.o: $(foo-objs)
# but that's not so easy, so we rather make all composite objects depend
# on the set of all their parts
$(multi-used-y) : %.o: $(multi-objs-y) FORCE
	$(call if_changed,link_multi-y)

$(multi-used-m) : %.o: $(multi-objs-m) FORCE
	$(call if_changed,link_multi-m)
	@{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)

targets += $(multi-used-y) $(multi-used-m)


# Descending
# ---------------------------------------------------------------------------

PHONY += $(subdir-ym)
$(subdir-ym):
	$(Q)$(MAKE) $(build)=$@

# Add FORCE to the prequisites of a target to force it to be always rebuilt.
# ---------------------------------------------------------------------------

PHONY += FORCE

FORCE:

# Read all saved command lines and dependencies for the $(targets) we
# may be building above, using $(if_changed{,_dep}). As an
# optimization, we don't need to read them if the target does not
# exist, we will rebuild anyway in that case.

targets := $(wildcard $(sort $(targets)))
cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))

ifneq ($(cmd_files),)
  include $(cmd_files)
endif


# Declare the contents of the .PHONY variable as phony.  We keep that
# information in a variable se we can use it in if_changed and friends.

.PHONY: $(PHONY)
Commit	Line	Data
1da177e4 LT	1	# ==========================================================================
	2	# Building
	3	# ==========================================================================
	4
	5	src := $(obj)
	6
4f193362	7	PHONY := __build
1da177e4 LT	8	__build:
1da177e4 LT	9
d72e5edb SR	10	# Init all relevant variables used in kbuild files so
	11	# 1) they have correct type
	12	# 2) they do not inherit any value from the environment
	13	obj-y :=
	14	obj-m :=
	15	lib-y :=
	16	lib-m :=
	17	always :=
	18	targets :=
	19	subdir-y :=
	20	subdir-m :=
	21	EXTRA_AFLAGS :=
	22	EXTRA_CFLAGS :=
	23	EXTRA_CPPFLAGS :=
	24	EXTRA_LDFLAGS :=
f77bf014 SR	25	asflags-y :=
	26	ccflags-y :=
	27	cppflags-y :=
	28	ldflags-y :=
d72e5edb	29
3156fd05	30	# Read auto.conf if it exists, otherwise ignore
c955ccaf	31	-include include/config/auto.conf
1da177e4	32
20a468b5 SR	33	include scripts/Kbuild.include
20a468b5 SR	34
3156fd05	35	# For backward compatibility check that these variables do not change
0c53c8e6 SR	36	save-cflags := $(CFLAGS)
0c53c8e6 SR	37
2a691470	38	# The filename Kbuild has precedence over Makefile
db8c1a7b	39	kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
0c53c8e6 SR	40	kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
	41	include $(kbuild-file)
	42
	43	# If the save-* variables changed error out
	44	ifeq ($(KBUILD_NOPEDANTIC),)
	45	ifneq ("$(save-cflags)","$(CFLAGS)")
	46	$(error CFLAGS was changed in "$(kbuild-file)". Fix it to use EXTRA_CFLAGS)
	47	endif
	48	endif
1da177e4 LT	49	include scripts/Makefile.lib
	50
	51	ifdef host-progs
	52	ifneq ($(hostprogs-y),$(host-progs))
	53	$(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
	54	hostprogs-y += $(host-progs)
	55	endif
	56	endif
	57
3156fd05	58	# Do not include host rules unless needed
1da177e4 LT	59	ifneq ($(hostprogs-y)$(hostprogs-m),)
	60	include scripts/Makefile.host
	61	endif
	62
	63	ifneq ($(KBUILD_SRC),)
	64	# Create output directory if not already present
	65	_dummy := $(shell [ -d $(obj) ] \|\| mkdir -p $(obj))
	66
	67	# Create directories for object files if directory does not exist
	68	# Needed when obj-y := dir/file.o syntax is used
	69	_dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] \|\| mkdir -p $(d)))
	70	endif
	71
1da177e4 LT	72	ifndef obj
	73	$(warning kbuild: Makefile.build is included improperly)
	74	endif
	75
	76	# ===========================================================================
	77
	78	ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),)
	79	lib-target := $(obj)/lib.a
	80	endif
	81
	82	ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(lib-target)),)
	83	builtin-target := $(obj)/built-in.o
	84	endif
	85
551559e1 TH	86	modorder-target := $(obj)/modules.order
551559e1 TH	87
1da177e4 LT	88	# We keep a list of all modules in $(MODVERDIR)
	89
	90	__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
551559e1	91	$(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
1da177e4 LT	92	$(subdir-ym) $(always)
	93	@:
	94
	95	# Linus' kernel sanity checking tool
	96	ifneq ($(KBUILD_CHECKSRC),0)
	97	ifeq ($(KBUILD_CHECKSRC),2)
	98	quiet_cmd_force_checksrc = CHECK $<
	99	cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
	100	else
	101	quiet_cmd_checksrc = CHECK $<
	102	cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
	103	endif
	104	endif
	105
91341d4b SR	106	# Do section mismatch analysis for each module/built-in.o
	107	ifdef CONFIG_DEBUG_SECTION_MISMATCH
	108	cmd_secanalysis = ; scripts/mod/modpost $@
	109	endif
1da177e4 LT	110
	111	# Compile C sources (.c)
	112	# ---------------------------------------------------------------------------
	113
	114	# Default is built-in, unless we know otherwise
	115	modkern_cflags := $(CFLAGS_KERNEL)
	116	quiet_modtag := $(empty) $(empty)
	117
	118	$(real-objs-m) : modkern_cflags := $(CFLAGS_MODULE)
	119	$(real-objs-m:.o=.i) : modkern_cflags := $(CFLAGS_MODULE)
	120	$(real-objs-m:.o=.s) : modkern_cflags := $(CFLAGS_MODULE)
	121	$(real-objs-m:.o=.lst): modkern_cflags := $(CFLAGS_MODULE)
	122
	123	$(real-objs-m) : quiet_modtag := [M]
	124	$(real-objs-m:.o=.i) : quiet_modtag := [M]
	125	$(real-objs-m:.o=.s) : quiet_modtag := [M]
	126	$(real-objs-m:.o=.lst): quiet_modtag := [M]
	127
	128	$(obj-m) : quiet_modtag := [M]
	129
	130	# Default for not multi-part modules
5e8d780d	131	modname = $(basetarget)
1da177e4 LT	132
	133	$(multi-objs-m) : modname = $(modname-multi)
	134	$(multi-objs-m:.o=.i) : modname = $(modname-multi)
	135	$(multi-objs-m:.o=.s) : modname = $(modname-multi)
	136	$(multi-objs-m:.o=.lst) : modname = $(modname-multi)
	137	$(multi-objs-y) : modname = $(modname-multi)
	138	$(multi-objs-y:.o=.i) : modname = $(modname-multi)
	139	$(multi-objs-y:.o=.s) : modname = $(modname-multi)
	140	$(multi-objs-y:.o=.lst) : modname = $(modname-multi)
	141
	142	quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
7d185983	143	cmd_cc_s_c = $(CC) $(c_flags) -fverbose-asm -S -o $@ $<
1da177e4	144
767e581d	145	$(obj)/%.s: $(src)/%.c FORCE
1da177e4 LT	146	$(call if_changed_dep,cc_s_c)
	147
	148	quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@
	149	cmd_cc_i_c = $(CPP) $(c_flags) -o $@ $<
	150
767e581d	151	$(obj)/%.i: $(src)/%.c FORCE
1da177e4 LT	152	$(call if_changed_dep,cc_i_c)
1da177e4 LT	153
ad7a953c	154	cmd_genksyms = \
37a8d9f6	155	$(CPP) -D__GENKSYMS__ $(c_flags) $< \| \
ad7a953c	156	$(GENKSYMS) -T $@ -A -a $(ARCH) \
37a8d9f6 SR	157	$(if $(KBUILD_PRESERVE),-p) \
	158	$(if $(1),-r $(firstword $(wildcard $(@:.symtypes=.symref) /dev/null)))
	159
15fde675	160	quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
37a8d9f6 SR	161	cmd_cc_symtypes_c = \
37a8d9f6 SR	162	set -e; \
ad7a953c	163	$(call cmd_genksyms, true) >/dev/null; \
37a8d9f6	164	test -s $@ \|\| rm -f $@
15fde675	165
767e581d	166	$(obj)/%.symtypes : $(src)/%.c FORCE
64e6c1e1	167	$(call cmd,cc_symtypes_c)
15fde675	168
1da177e4 LT	169	# C (.c) files
	170	# The C file is compiled and updated dependency information is generated.
	171	# (See cmd_cc_o_c + relevant part of rule_cc_o_c)
	172
	173	quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
	174
	175	ifndef CONFIG_MODVERSIONS
	176	cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
	177
	178	else
	179	# When module versioning is enabled the following steps are executed:
ad7a953c JB	180	# o compile a .tmp_<file>.s from <file>.c
	181	# o if .tmp_<file>.s doesn't contain a __ksymtab version, i.e. does
	182	# not export symbols, we just assemble .tmp_<file>.s to <file>.o and
1da177e4 LT	183	# are done.
	184	# o otherwise, we calculate symbol versions using the good old
	185	# genksyms on the preprocessed source and postprocess them in a way
ad7a953c JB	186	# that they are usable as assembly source
	187	# o assemble <file>.o from .tmp_<file>.s forcing inclusion of directives
	188	# defining the actual values of __crc_*, followed by objcopy-ing them
	189	# to force these symbols to be local to permit stripping them later.
	190	s_file = $(@D)/.tmp_$(@F:.o=.s)
	191	v_file = $(@D)/.tmp_$(@F:.o=.v)
	192	tmp_o_file = $(@D)/.tmp_$(@F)
	193	no_g_c_flags = $(filter-out -g%,$(c_flags))
	194
	195	cmd_cc_o_c = $(CC) $(c_flags) -S -o $(s_file) $<
1da177e4	196
1da177e4	197	cmd_modversions = \
ad7a953c JB	198	if grep -q __ksymtab $(s_file); then \
	199	if $(call cmd_genksyms, $(KBUILD_SYMTYPES)) > $(v_file) \
	200	&& $(CC) $(no_g_c_flags) -c -Wa,$(v_file) \
	201	-o $(tmp_o_file) $(s_file) \
	202	&& $(OBJCOPY) -L '__crc_' -L '___crc_' -w \
	203	$(tmp_o_file) $@; \
	204	then \
	205	: ; \
	206	else \
	207	rm -f $@; exit 1; \
	208	fi; \
1da177e4	209	else \
ad7a953c JB	210	rm -f $(v_file); \
ad7a953c JB	211	$(CC) $(no_g_c_flags) -c -o $@ $(s_file); \
1da177e4 LT	212	fi;
	213	endif
	214
8da3821b	215	ifdef CONFIG_FTRACE_MCOUNT_RECORD
b3acf29a SR	216	cmd_record_mcount = perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
	217	"$(if $(CONFIG_64BIT),64,32)" \
	218	"$(OBJDUMP)" "$(OBJCOPY)" "$(CC)" "$(LD)" "$(NM)" "$(RM)" "$(MV)" "$(@)";
8da3821b SR	219	endif
8da3821b SR	220
1da177e4	221	define rule_cc_o_c
6176aa9a JB	222	$(call echo-cmd,checksrc) $(cmd_checksrc) \
6176aa9a JB	223	$(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \
1da177e4	224	$(cmd_modversions) \
8da3821b	225	$(cmd_record_mcount) \
48f1f058 SR	226	scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > \
48f1f058 SR	227	$(dot-target).tmp; \
ad7a953c JB	228	if [ -r $(@D)/.tmp_$(@F:.o=.v) ]; then \
	229	echo >> $(dot-target).tmp; \
	230	echo '$@: $(GENKSYMS)' >> $(dot-target).tmp; \
	231	echo '$(GENKSYMS):: ;' >> $(dot-target).tmp; \
	232	fi; \
	233	rm -f $(depfile) $(@D)/.tmp_$(@F:.o=.?); \
48f1f058	234	mv -f $(dot-target).tmp $(dot-target).cmd
1da177e4 LT	235	endef
	236
	237	# Built-in and composite module parts
767e581d	238	$(obj)/%.o: $(src)/%.c FORCE
1da177e4 LT	239	$(call cmd,force_checksrc)
	240	$(call if_changed_rule,cc_o_c)
	241
	242	# Single-part modules are special since we need to mark them in $(MODVERDIR)
	243
767e581d	244	$(single-used-m): $(obj)/%.o: $(src)/%.c FORCE
1da177e4 LT	245	$(call cmd,force_checksrc)
	246	$(call if_changed_rule,cc_o_c)
	247	@{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)
	248
	249	quiet_cmd_cc_lst_c = MKLST $@
	250	cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
	251	$(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
	252	System.map $(OBJDUMP) > $@
	253
767e581d	254	$(obj)/%.lst: $(src)/%.c FORCE
1da177e4 LT	255	$(call if_changed_dep,cc_lst_c)
	256
	257	# Compile assembler sources (.S)
	258	# ---------------------------------------------------------------------------
	259
	260	modkern_aflags := $(AFLAGS_KERNEL)
	261
	262	$(real-objs-m) : modkern_aflags := $(AFLAGS_MODULE)
	263	$(real-objs-m:.o=.s): modkern_aflags := $(AFLAGS_MODULE)
	264
	265	quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
	266	cmd_as_s_S = $(CPP) $(a_flags) -o $@ $<
	267
767e581d	268	$(obj)/%.s: $(src)/%.S FORCE
1da177e4 LT	269	$(call if_changed_dep,as_s_S)
	270
	271	quiet_cmd_as_o_S = AS $(quiet_modtag) $@
	272	cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
	273
767e581d	274	$(obj)/%.o: $(src)/%.S FORCE
1da177e4 LT	275	$(call if_changed_dep,as_o_S)
	276
	277	targets += $(real-objs-y) $(real-objs-m) $(lib-y)
	278	targets += $(extra-y) $(MAKECMDGOALS) $(always)
	279
	280	# Linker scripts preprocessor (.lds.S -> .lds)
	281	# ---------------------------------------------------------------------------
	282	quiet_cmd_cpp_lds_S = LDS $@
	283	cmd_cpp_lds_S = $(CPP) $(cpp_flags) -D__ASSEMBLY__ -o $@ $<
	284
767e581d	285	$(obj)/%.lds: $(src)/%.lds.S FORCE
1da177e4 LT	286	$(call if_changed_dep,cpp_lds_S)
	287
	288	# Build the compiled-in targets
	289	# ---------------------------------------------------------------------------
	290
	291	# To build objects in subdirs, we need to descend into the directories
	292	$(sort $(subdir-obj-y)): $(subdir-ym) ;
	293
	294	#
	295	# Rule to compile a set of .o files into one .o file
	296	#
	297	ifdef builtin-target
	298	quiet_cmd_link_o_target = LD $@
	299	# If the list of objects to link is empty, just create an empty built-in.o
	300	cmd_link_o_target = $(if $(strip $(obj-y)),\
91341d4b SR	301	$(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \
91341d4b SR	302	$(cmd_secanalysis),\
1da177e4 LT	303	rm -f $@; $(AR) rcs $@)
	304
	305	$(builtin-target): $(obj-y) FORCE
	306	$(call if_changed,link_o_target)
	307
	308	targets += $(builtin-target)
	309	endif # builtin-target
	310
551559e1 TH	311	#
	312	# Rule to create modules.order file
	313	#
	314	# Create commands to either record .ko file or cat modules.order from
	315	# a subdirectory
	316	modorder-cmds = \
	317	$(foreach m, $(modorder), \
	318	$(if $(filter %/modules.order, $m), \
	319	cat $m;, echo kernel/$m;))
	320
	321	$(modorder-target): $(subdir-ym) FORCE
	322	$(Q)(cat /dev/null; $(modorder-cmds)) > $@
	323
1da177e4 LT	324	#
	325	# Rule to compile a set of .o files into one .a file
	326	#
	327	ifdef lib-target
	328	quiet_cmd_link_l_target = AR $@
5e54d5e5	329	cmd_link_l_target = rm -f $@; $(AR) rcs $@ $(lib-y)
1da177e4 LT	330
	331	$(lib-target): $(lib-y) FORCE
	332	$(call if_changed,link_l_target)
	333
	334	targets += $(lib-target)
	335	endif
	336
	337	#
	338	# Rule to link composite objects
	339	#
	340	# Composite objects are specified in kbuild makefile as follows:
	341	# <composite-object>-objs := <list of .o files>
	342	# or
	343	# <composite-object>-y := <list of .o files>
	344	link_multi_deps = \
	345	$(filter $(addprefix $(obj)/, \
	346	$($(subst $(obj)/,,$(@:.o=-objs))) \
	347	$($(subst $(obj)/,,$(@:.o=-y)))), $^)
	348
	349	quiet_cmd_link_multi-y = LD $@
91341d4b	350	cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
1da177e4 LT	351
1da177e4 LT	352	quiet_cmd_link_multi-m = LD [M] $@
114f5157	353	cmd_link_multi-m = $(cmd_link_multi-y)
1da177e4 LT	354
	355	# We would rather have a list of rules like
	356	# foo.o: $(foo-objs)
	357	# but that's not so easy, so we rather make all composite objects depend
	358	# on the set of all their parts
	359	$(multi-used-y) : %.o: $(multi-objs-y) FORCE
	360	$(call if_changed,link_multi-y)
	361
	362	$(multi-used-m) : %.o: $(multi-objs-m) FORCE
	363	$(call if_changed,link_multi-m)
	364	@{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
	365
	366	targets += $(multi-used-y) $(multi-used-m)
	367
	368
	369	# Descending
	370	# ---------------------------------------------------------------------------
	371
4f193362	372	PHONY += $(subdir-ym)
1da177e4 LT	373	$(subdir-ym):
	374	$(Q)$(MAKE) $(build)=$@
	375
	376	# Add FORCE to the prequisites of a target to force it to be always rebuilt.
	377	# ---------------------------------------------------------------------------
	378
4f193362	379	PHONY += FORCE
1da177e4 LT	380
	381	FORCE:
	382
	383	# Read all saved command lines and dependencies for the $(targets) we
	384	# may be building above, using $(if_changed{,_dep}). As an
	385	# optimization, we don't need to read them if the target does not
	386	# exist, we will rebuild anyway in that case.
	387
	388	targets := $(wildcard $(sort $(targets)))
	389	cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
	390
	391	ifneq ($(cmd_files),)
	392	include $(cmd_files)
	393	endif
4f193362 PS	394
	395
	396	# Declare the contents of the .PHONY variable as phony. We keep that
	397	# information in a variable se we can use it in if_changed and friends.
	398
	399	.PHONY: $(PHONY)