[linux.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  :=

subdir-asflags-y :=
subdir-ccflags-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 = $(if $(part-of-module), $(CFLAGS_MODULE), $(CFLAGS_KERNEL))
quiet_modtag := $(empty)   $(empty)

$(real-objs-m)        : part-of-module := y
$(real-objs-m:.o=.i)  : part-of-module := y
$(real-objs-m:.o=.s)  : part-of-module := y
$(real-objs-m:.o=.lst): part-of-module := y

$(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_gensymtypes =                                                           \
    $(CPP) -D__GENKSYMS__ $(c_flags) $< |                                   \
    $(GENKSYMS) -T $@ -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_gensymtypes, 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>.o from <file>.c
# o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
#   not export symbols, we just rename .tmp_<file>.o 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 a linker script
# o generate <file>.o from .tmp_<file>.o using the linker to
#   replace the unresolved symbols __crc_exported_symbol with
#   the actual value of the checksum generated by genksyms

cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
cmd_modversions =							\
	if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then	\
		$(call cmd_gensymtypes, $(KBUILD_SYMTYPES))		\
		    > $(@D)/.tmp_$(@F:.o=.ver);				\
									\
		$(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) 		\
			-T $(@D)/.tmp_$(@F:.o=.ver);			\
		rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver);	\
	else								\
		mv -f $(@D)/.tmp_$(@F) $@;				\
	fi;
endif

ifdef CONFIG_FTRACE_MCOUNT_RECORD
cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
	"$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
	"$(if $(CONFIG_64BIT),64,32)" \
	"$(OBJDUMP)" "$(OBJCOPY)" "$(CC)" "$(LD)" "$(NM)" "$(RM)" "$(MV)" \
	"$(if $(part-of-module),1,0)" "$(@)";
endif

define rule_cc_o_c
	$(call echo-cmd,checksrc) $(cmd_checksrc)			  \
	$(call echo-cmd,cc_o_c) $(cmd_cc_o_c);				  \
	$(cmd_modversions)						  \
	$(call echo-cmd,record_mcount)					  \
	$(cmd_record_mcount)						  \
	scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' >    \
	                                              $(dot-target).tmp;  \
	rm -f $(depfile);						  \
	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) $(cpp_flags) -P -C -U$(ARCH) \
	                     -D__ASSEMBLY__ -DLINKER_SCRIPT -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
720097d8 SR	30	subdir-asflags-y :=
	31	subdir-ccflags-y :=
	32
3156fd05	33	# Read auto.conf if it exists, otherwise ignore
c955ccaf	34	-include include/config/auto.conf
1da177e4	35
20a468b5 SR	36	include scripts/Kbuild.include
20a468b5 SR	37
3156fd05	38	# For backward compatibility check that these variables do not change
0c53c8e6 SR	39	save-cflags := $(CFLAGS)
0c53c8e6 SR	40
2a691470	41	# The filename Kbuild has precedence over Makefile
db8c1a7b	42	kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
0c53c8e6 SR	43	kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
	44	include $(kbuild-file)
	45
	46	# If the save-* variables changed error out
	47	ifeq ($(KBUILD_NOPEDANTIC),)
	48	ifneq ("$(save-cflags)","$(CFLAGS)")
	49	$(error CFLAGS was changed in "$(kbuild-file)". Fix it to use EXTRA_CFLAGS)
	50	endif
	51	endif
1da177e4 LT	52	include scripts/Makefile.lib
	53
	54	ifdef host-progs
	55	ifneq ($(hostprogs-y),$(host-progs))
	56	$(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
	57	hostprogs-y += $(host-progs)
	58	endif
	59	endif
	60
3156fd05	61	# Do not include host rules unless needed
1da177e4 LT	62	ifneq ($(hostprogs-y)$(hostprogs-m),)
	63	include scripts/Makefile.host
	64	endif
	65
	66	ifneq ($(KBUILD_SRC),)
	67	# Create output directory if not already present
	68	_dummy := $(shell [ -d $(obj) ] \|\| mkdir -p $(obj))
	69
	70	# Create directories for object files if directory does not exist
	71	# Needed when obj-y := dir/file.o syntax is used
	72	_dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] \|\| mkdir -p $(d)))
	73	endif
	74
1da177e4 LT	75	ifndef obj
	76	$(warning kbuild: Makefile.build is included improperly)
	77	endif
	78
	79	# ===========================================================================
	80
	81	ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),)
	82	lib-target := $(obj)/lib.a
	83	endif
	84
	85	ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(lib-target)),)
	86	builtin-target := $(obj)/built-in.o
	87	endif
	88
551559e1 TH	89	modorder-target := $(obj)/modules.order
551559e1 TH	90
1da177e4 LT	91	# We keep a list of all modules in $(MODVERDIR)
	92
	93	__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
551559e1	94	$(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
1da177e4 LT	95	$(subdir-ym) $(always)
	96	@:
	97
	98	# Linus' kernel sanity checking tool
	99	ifneq ($(KBUILD_CHECKSRC),0)
	100	ifeq ($(KBUILD_CHECKSRC),2)
	101	quiet_cmd_force_checksrc = CHECK $<
	102	cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
	103	else
	104	quiet_cmd_checksrc = CHECK $<
	105	cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
	106	endif
	107	endif
	108
91341d4b SR	109	# Do section mismatch analysis for each module/built-in.o
	110	ifdef CONFIG_DEBUG_SECTION_MISMATCH
	111	cmd_secanalysis = ; scripts/mod/modpost $@
	112	endif
1da177e4 LT	113
	114	# Compile C sources (.c)
	115	# ---------------------------------------------------------------------------
	116
	117	# Default is built-in, unless we know otherwise
18c167fd	118	modkern_cflags = $(if $(part-of-module), $(CFLAGS_MODULE), $(CFLAGS_KERNEL))
1da177e4 LT	119	quiet_modtag := $(empty) $(empty)
1da177e4 LT	120
18c167fd SL	121	$(real-objs-m) : part-of-module := y
	122	$(real-objs-m:.o=.i) : part-of-module := y
	123	$(real-objs-m:.o=.s) : part-of-module := y
	124	$(real-objs-m:.o=.lst): part-of-module := y
1da177e4 LT	125
	126	$(real-objs-m) : quiet_modtag := [M]
	127	$(real-objs-m:.o=.i) : quiet_modtag := [M]
	128	$(real-objs-m:.o=.s) : quiet_modtag := [M]
	129	$(real-objs-m:.o=.lst): quiet_modtag := [M]
	130
	131	$(obj-m) : quiet_modtag := [M]
	132
	133	# Default for not multi-part modules
5e8d780d	134	modname = $(basetarget)
1da177e4 LT	135
	136	$(multi-objs-m) : modname = $(modname-multi)
	137	$(multi-objs-m:.o=.i) : modname = $(modname-multi)
	138	$(multi-objs-m:.o=.s) : modname = $(modname-multi)
	139	$(multi-objs-m:.o=.lst) : modname = $(modname-multi)
	140	$(multi-objs-y) : modname = $(modname-multi)
	141	$(multi-objs-y:.o=.i) : modname = $(modname-multi)
	142	$(multi-objs-y:.o=.s) : modname = $(modname-multi)
	143	$(multi-objs-y:.o=.lst) : modname = $(modname-multi)
	144
	145	quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
7d185983	146	cmd_cc_s_c = $(CC) $(c_flags) -fverbose-asm -S -o $@ $<
1da177e4	147
767e581d	148	$(obj)/%.s: $(src)/%.c FORCE
1da177e4 LT	149	$(call if_changed_dep,cc_s_c)
	150
	151	quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@
	152	cmd_cc_i_c = $(CPP) $(c_flags) -o $@ $<
	153
767e581d	154	$(obj)/%.i: $(src)/%.c FORCE
1da177e4 LT	155	$(call if_changed_dep,cc_i_c)
1da177e4 LT	156
2ea03891	157	cmd_gensymtypes = \
37a8d9f6	158	$(CPP) -D__GENKSYMS__ $(c_flags) $< \| \
2ea03891	159	$(GENKSYMS) -T $@ -a $(ARCH) \
37a8d9f6 SR	160	$(if $(KBUILD_PRESERVE),-p) \
	161	$(if $(1),-r $(firstword $(wildcard $(@:.symtypes=.symref) /dev/null)))
	162
15fde675	163	quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
37a8d9f6 SR	164	cmd_cc_symtypes_c = \
37a8d9f6 SR	165	set -e; \
2ea03891	166	$(call cmd_gensymtypes, true) >/dev/null; \
37a8d9f6	167	test -s $@ \|\| rm -f $@
15fde675	168
767e581d	169	$(obj)/%.symtypes : $(src)/%.c FORCE
64e6c1e1	170	$(call cmd,cc_symtypes_c)
15fde675	171
1da177e4 LT	172	# C (.c) files
	173	# The C file is compiled and updated dependency information is generated.
	174	# (See cmd_cc_o_c + relevant part of rule_cc_o_c)
	175
	176	quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
	177
	178	ifndef CONFIG_MODVERSIONS
	179	cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
	180
	181	else
	182	# When module versioning is enabled the following steps are executed:
2ea03891 SR	183	# o compile a .tmp_<file>.o from <file>.c
	184	# o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
	185	# not export symbols, we just rename .tmp_<file>.o to <file>.o and
1da177e4 LT	186	# are done.
	187	# o otherwise, we calculate symbol versions using the good old
	188	# genksyms on the preprocessed source and postprocess them in a way
2ea03891 SR	189	# that they are usable as a linker script
	190	# o generate <file>.o from .tmp_<file>.o using the linker to
	191	# replace the unresolved symbols __crc_exported_symbol with
	192	# the actual value of the checksum generated by genksyms
1da177e4	193
2ea03891	194	cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
1da177e4	195	cmd_modversions = \
2ea03891 SR	196	if $(OBJDUMP) -h $(@D)/.tmp_$(@F) \| grep -q __ksymtab; then \
	197	$(call cmd_gensymtypes, $(KBUILD_SYMTYPES)) \
	198	> $(@D)/.tmp_$(@F:.o=.ver); \
	199	\
	200	$(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
	201	-T $(@D)/.tmp_$(@F:.o=.ver); \
	202	rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
1da177e4	203	else \
2ea03891	204	mv -f $(@D)/.tmp_$(@F) $@; \
1da177e4 LT	205	fi;
	206	endif
	207
8da3821b	208	ifdef CONFIG_FTRACE_MCOUNT_RECORD
66a57062	209	cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
e6299d26	210	"$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
b3acf29a	211	"$(if $(CONFIG_64BIT),64,32)" \
18c167fd SL	212	"$(OBJDUMP)" "$(OBJCOPY)" "$(CC)" "$(LD)" "$(NM)" "$(RM)" "$(MV)" \
18c167fd SL	213	"$(if $(part-of-module),1,0)" "$(@)";
8da3821b SR	214	endif
8da3821b SR	215
1da177e4	216	define rule_cc_o_c
6176aa9a JB	217	$(call echo-cmd,checksrc) $(cmd_checksrc) \
6176aa9a JB	218	$(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \
1da177e4	219	$(cmd_modversions) \
c3c63b6b	220	$(call echo-cmd,record_mcount) \
8da3821b	221	$(cmd_record_mcount) \
48f1f058 SR	222	scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > \
48f1f058 SR	223	$(dot-target).tmp; \
2ea03891	224	rm -f $(depfile); \
48f1f058	225	mv -f $(dot-target).tmp $(dot-target).cmd
1da177e4 LT	226	endef
	227
	228	# Built-in and composite module parts
767e581d	229	$(obj)/%.o: $(src)/%.c FORCE
1da177e4 LT	230	$(call cmd,force_checksrc)
	231	$(call if_changed_rule,cc_o_c)
	232
	233	# Single-part modules are special since we need to mark them in $(MODVERDIR)
	234
767e581d	235	$(single-used-m): $(obj)/%.o: $(src)/%.c FORCE
1da177e4 LT	236	$(call cmd,force_checksrc)
	237	$(call if_changed_rule,cc_o_c)
	238	@{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)
	239
	240	quiet_cmd_cc_lst_c = MKLST $@
	241	cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
	242	$(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
	243	System.map $(OBJDUMP) > $@
	244
767e581d	245	$(obj)/%.lst: $(src)/%.c FORCE
1da177e4 LT	246	$(call if_changed_dep,cc_lst_c)
	247
	248	# Compile assembler sources (.S)
	249	# ---------------------------------------------------------------------------
	250
	251	modkern_aflags := $(AFLAGS_KERNEL)
	252
	253	$(real-objs-m) : modkern_aflags := $(AFLAGS_MODULE)
	254	$(real-objs-m:.o=.s): modkern_aflags := $(AFLAGS_MODULE)
	255
	256	quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
	257	cmd_as_s_S = $(CPP) $(a_flags) -o $@ $<
	258
767e581d	259	$(obj)/%.s: $(src)/%.S FORCE
1da177e4 LT	260	$(call if_changed_dep,as_s_S)
	261
	262	quiet_cmd_as_o_S = AS $(quiet_modtag) $@
	263	cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
	264
767e581d	265	$(obj)/%.o: $(src)/%.S FORCE
1da177e4 LT	266	$(call if_changed_dep,as_o_S)
	267
	268	targets += $(real-objs-y) $(real-objs-m) $(lib-y)
	269	targets += $(extra-y) $(MAKECMDGOALS) $(always)
	270
	271	# Linker scripts preprocessor (.lds.S -> .lds)
	272	# ---------------------------------------------------------------------------
	273	quiet_cmd_cpp_lds_S = LDS $@
51b563fc	274	cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \
42f29a25	275	-D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
1da177e4	276
767e581d	277	$(obj)/%.lds: $(src)/%.lds.S FORCE
1da177e4 LT	278	$(call if_changed_dep,cpp_lds_S)
	279
	280	# Build the compiled-in targets
	281	# ---------------------------------------------------------------------------
	282
	283	# To build objects in subdirs, we need to descend into the directories
	284	$(sort $(subdir-obj-y)): $(subdir-ym) ;
	285
	286	#
	287	# Rule to compile a set of .o files into one .o file
	288	#
	289	ifdef builtin-target
	290	quiet_cmd_link_o_target = LD $@
	291	# If the list of objects to link is empty, just create an empty built-in.o
	292	cmd_link_o_target = $(if $(strip $(obj-y)),\
91341d4b SR	293	$(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \
91341d4b SR	294	$(cmd_secanalysis),\
1da177e4 LT	295	rm -f $@; $(AR) rcs $@)
	296
	297	$(builtin-target): $(obj-y) FORCE
	298	$(call if_changed,link_o_target)
	299
	300	targets += $(builtin-target)
	301	endif # builtin-target
	302
551559e1 TH	303	#
	304	# Rule to create modules.order file
	305	#
	306	# Create commands to either record .ko file or cat modules.order from
	307	# a subdirectory
	308	modorder-cmds = \
	309	$(foreach m, $(modorder), \
	310	$(if $(filter %/modules.order, $m), \
	311	cat $m;, echo kernel/$m;))
	312
	313	$(modorder-target): $(subdir-ym) FORCE
	314	$(Q)(cat /dev/null; $(modorder-cmds)) > $@
	315
1da177e4 LT	316	#
	317	# Rule to compile a set of .o files into one .a file
	318	#
	319	ifdef lib-target
	320	quiet_cmd_link_l_target = AR $@
5e54d5e5	321	cmd_link_l_target = rm -f $@; $(AR) rcs $@ $(lib-y)
1da177e4 LT	322
	323	$(lib-target): $(lib-y) FORCE
	324	$(call if_changed,link_l_target)
	325
	326	targets += $(lib-target)
	327	endif
	328
	329	#
	330	# Rule to link composite objects
	331	#
	332	# Composite objects are specified in kbuild makefile as follows:
	333	# <composite-object>-objs := <list of .o files>
	334	# or
	335	# <composite-object>-y := <list of .o files>
	336	link_multi_deps = \
	337	$(filter $(addprefix $(obj)/, \
	338	$($(subst $(obj)/,,$(@:.o=-objs))) \
	339	$($(subst $(obj)/,,$(@:.o=-y)))), $^)
	340
	341	quiet_cmd_link_multi-y = LD $@
91341d4b	342	cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
1da177e4 LT	343
1da177e4 LT	344	quiet_cmd_link_multi-m = LD [M] $@
114f5157	345	cmd_link_multi-m = $(cmd_link_multi-y)
1da177e4 LT	346
	347	# We would rather have a list of rules like
	348	# foo.o: $(foo-objs)
	349	# but that's not so easy, so we rather make all composite objects depend
	350	# on the set of all their parts
	351	$(multi-used-y) : %.o: $(multi-objs-y) FORCE
	352	$(call if_changed,link_multi-y)
	353
	354	$(multi-used-m) : %.o: $(multi-objs-m) FORCE
	355	$(call if_changed,link_multi-m)
	356	@{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
	357
	358	targets += $(multi-used-y) $(multi-used-m)
	359
	360
	361	# Descending
	362	# ---------------------------------------------------------------------------
	363
4f193362	364	PHONY += $(subdir-ym)
1da177e4 LT	365	$(subdir-ym):
	366	$(Q)$(MAKE) $(build)=$@
	367
	368	# Add FORCE to the prequisites of a target to force it to be always rebuilt.
	369	# ---------------------------------------------------------------------------
	370
4f193362	371	PHONY += FORCE
1da177e4 LT	372
	373	FORCE:
	374
	375	# Read all saved command lines and dependencies for the $(targets) we
	376	# may be building above, using $(if_changed{,_dep}). As an
	377	# optimization, we don't need to read them if the target does not
	378	# exist, we will rebuild anyway in that case.
	379
	380	targets := $(wildcard $(sort $(targets)))
	381	cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
	382
	383	ifneq ($(cmd_files),)
	384	include $(cmd_files)
	385	endif
4f193362 PS	386
	387
	388	# Declare the contents of the .PHONY variable as phony. We keep that
	389	# information in a variable se we can use it in if_changed and friends.
	390
	391	.PHONY: $(PHONY)