[deliverable/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 ccflags-y)
        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)$(hostlibs-y)$(hostlibs-m)$(hostcxxlibs-y)$(hostcxxlibs-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-)),)
lib-target := $(obj)/lib.a
obj-y += $(obj)/lib-ksyms.o
endif

ifneq ($(strip $(obj-y) $(obj-m) $(obj-) $(subdir-m) $(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),                           \
		$(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
		$(KBUILD_CFLAGS_KERNEL) $(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) $(DISABLE_LTO) -fverbose-asm -S -o $@ $<

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

quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@
cmd_cpp_i_c       = $(CPP) $(c_flags) -o $@ $<

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

cmd_gensymtypes =                                                           \
    $(CPP) -D__GENKSYMS__ $(c_flags) $< |                                   \
    $(GENKSYMS) $(if $(1), -T $(2))                                         \
     $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))             \
     $(if $(KBUILD_PRESERVE),-p)                                            \
     -r $(firstword $(wildcard $(2:.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),$(@:.o=.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
ifdef BUILD_C_RECORDMCOUNT
ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
  RECORDMCOUNT_FLAGS = -w
endif
# Due to recursion, we must skip empty.o.
# The empty.o file is created in the make process in order to determine
#  the target endianness and word size. It is made before all other C
#  files, including recordmcount.
sub_cmd_record_mcount =					\
	if [ $(@) != "scripts/mod/empty.o" ]; then	\
		$(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)";	\
	fi;
recordmcount_source := $(srctree)/scripts/recordmcount.c \
		    $(srctree)/scripts/recordmcount.h
else
sub_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) $(KBUILD_CFLAGS)" \
	"$(LD)" "$(NM)" "$(RM)" "$(MV)" \
	"$(if $(part-of-module),1,0)" "$(@)";
recordmcount_source := $(srctree)/scripts/recordmcount.pl
endif
cmd_record_mcount =						\
	if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" =	\
	     "$(CC_FLAGS_FTRACE)" ]; then			\
		$(sub_cmd_record_mcount)			\
	fi;
endif

ifdef CONFIG_STACK_VALIDATION
ifneq ($(SKIP_STACK_VALIDATION),1)

__objtool_obj := $(objtree)/tools/objtool/objtool

objtool_args = check
ifndef CONFIG_FRAME_POINTER
objtool_args += --no-fp
endif

# 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory
# 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file
# 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file
cmd_objtool = $(if $(patsubst y%,, \
	$(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
	$(__objtool_obj) $(objtool_args) "$(@)";)
objtool_obj = $(if $(patsubst y%,, \
	$(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
	$(__objtool_obj))

endif # SKIP_STACK_VALIDATION
endif # CONFIG_STACK_VALIDATION

define rule_cc_o_c
	$(call echo-cmd,checksrc) $(cmd_checksrc)			  \
	$(call cmd_and_fixdep,cc_o_c)					  \
	$(cmd_modversions)						  \
	$(cmd_objtool)						          \
	$(call echo-cmd,record_mcount) $(cmd_record_mcount)
endef

define rule_as_o_S
	$(call cmd_and_fixdep,as_o_S)					  \
	$(cmd_objtool)
endef

# List module undefined symbols (or empty line if not enabled)
ifdef CONFIG_TRIM_UNUSED_KSYMS
cmd_undef_syms = $(NM) $@ | sed -n 's/^ \+U //p' | xargs echo
else
cmd_undef_syms = echo
endif

# Built-in and composite module parts
$(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_obj) 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 $(recordmcount_source) $(objtool_obj) FORCE
	$(call cmd,force_checksrc)
	$(call if_changed_rule,cc_o_c)
	@{ echo $(@:.o=.ko); echo $@; \
	   $(cmd_undef_syms); } > $(MODVERDIR)/$(@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 := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)

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

quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@
cmd_cpp_s_S       = $(CPP) $(a_flags) -o $@ $<

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

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

$(obj)/%.o: $(src)/%.S $(objtool_obj) FORCE
	$(call if_changed_rule,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)

# ASN.1 grammar
# ---------------------------------------------------------------------------
quiet_cmd_asn1_compiler = ASN.1   $@
      cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
				$(subst .h,.c,$@) $(subst .c,.h,$@)

.PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.h

$(obj)/%-asn1.c $(obj)/%-asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
	$(call cmd,asn1_compiler)

# 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

ifdef CONFIG_THIN_ARCHIVES
  cmd_make_builtin = rm -f $@; $(AR) rcST$(KBUILD_ARFLAGS)
  cmd_make_empty_builtin = rm -f $@; $(AR) rcST$(KBUILD_ARFLAGS)
  quiet_cmd_link_o_target = AR      $@
else
  cmd_make_builtin = $(LD) $(ld_flags) -r -o
  cmd_make_empty_builtin = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS)
  quiet_cmd_link_o_target = LD      $@
endif

# If the list of objects to link is empty, just create an empty built-in.o
cmd_link_o_target = $(if $(strip $(obj-y)),\
		      $(cmd_make_builtin) $@ $(filter $(obj-y), $^) \
		      $(cmd_secanalysis),\
		      $(cmd_make_empty_builtin) $@)

$(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      $@

ifdef CONFIG_THIN_ARCHIVES
  cmd_link_l_target = rm -f $@; $(AR) rcsT$(KBUILD_ARFLAGS) $@ $(lib-y)
else
  cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y)
endif

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

targets += $(lib-target)

dummy-object = $(obj)/.lib_exports.o
ksyms-lds = $(dot-target).lds
ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
ref_prefix = EXTERN(_
else
ref_prefix = EXTERN(
endif

quiet_cmd_export_list = EXPORTS $@
cmd_export_list = $(OBJDUMP) -h $< | \
	sed -ne '/___ksymtab/{s/.*+/$(ref_prefix)/;s/ .*/)/;p}' >$(ksyms-lds);\
	rm -f $(dummy-object);\
	$(AR) rcs$(KBUILD_ARFLAGS) $(dummy-object);\
	$(LD) $(ld_flags) -r -o $@ -T $(ksyms-lds) $(dummy-object);\
	rm $(dummy-object) $(ksyms-lds)

$(obj)/lib-ksyms.o: $(lib-target) FORCE
	$(call if_changed,export_list)
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>
#  or
#    <composite-object>-m    := <list of .o files>
#  The -m syntax only works if <composite object> is a module
link_multi_deps =                     \
$(filter $(addprefix $(obj)/,         \
$($(subst $(obj)/,,$(@:.o=-objs)))    \
$($(subst $(obj)/,,$(@:.o=-y)))       \
$($(subst $(obj)/,,$(@:.o=-m)))), $^)

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)

$(multi-used-y): FORCE
	$(call if_changed,link_multi-y)
$(call multi_depend, $(multi-used-y), .o, -objs -y)

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

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)")
49c57d25	49	$(error CFLAGS was changed in "$(kbuild-file)". Fix it to use ccflags-y)
0c53c8e6 SR	50	endif
0c53c8e6 SR	51	endif
4a5838ad	52
1da177e4 LT	53	include scripts/Makefile.lib
	54
	55	ifdef host-progs
	56	ifneq ($(hostprogs-y),$(host-progs))
	57	$(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
	58	hostprogs-y += $(host-progs)
	59	endif
	60	endif
	61
3156fd05	62	# Do not include host rules unless needed
24403874	63	ifneq ($(hostprogs-y)$(hostprogs-m)$(hostlibs-y)$(hostlibs-m)$(hostcxxlibs-y)$(hostcxxlibs-m),)
1da177e4 LT	64	include scripts/Makefile.host
	65	endif
	66
	67	ifneq ($(KBUILD_SRC),)
	68	# Create output directory if not already present
	69	_dummy := $(shell [ -d $(obj) ] \|\| mkdir -p $(obj))
	70
	71	# Create directories for object files if directory does not exist
	72	# Needed when obj-y := dir/file.o syntax is used
	73	_dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] \|\| mkdir -p $(d)))
	74	endif
	75
1da177e4 LT	76	ifndef obj
	77	$(warning kbuild: Makefile.build is included improperly)
	78	endif
	79
	80	# ===========================================================================
	81
a4954fd7	82	ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)
1da177e4	83	lib-target := $(obj)/lib.a
7f2084fa	84	obj-y += $(obj)/lib-ksyms.o
1da177e4 LT	85	endif
1da177e4 LT	86
a4954fd7	87	ifneq ($(strip $(obj-y) $(obj-m) $(obj-) $(subdir-m) $(lib-target)),)
1da177e4 LT	88	builtin-target := $(obj)/built-in.o
	89	endif
	90
551559e1 TH	91	modorder-target := $(obj)/modules.order
551559e1 TH	92
1da177e4 LT	93	# We keep a list of all modules in $(MODVERDIR)
	94
	95	__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
551559e1	96	$(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
1da177e4 LT	97	$(subdir-ym) $(always)
	98	@:
	99
	100	# Linus' kernel sanity checking tool
	101	ifneq ($(KBUILD_CHECKSRC),0)
	102	ifeq ($(KBUILD_CHECKSRC),2)
	103	quiet_cmd_force_checksrc = CHECK $<
	104	cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
	105	else
	106	quiet_cmd_checksrc = CHECK $<
	107	cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
	108	endif
	109	endif
	110
91341d4b SR	111	# Do section mismatch analysis for each module/built-in.o
	112	ifdef CONFIG_DEBUG_SECTION_MISMATCH
	113	cmd_secanalysis = ; scripts/mod/modpost $@
	114	endif
1da177e4 LT	115
	116	# Compile C sources (.c)
	117	# ---------------------------------------------------------------------------
	118
	119	# Default is built-in, unless we know otherwise
6588169d SR	120	modkern_cflags = \
	121	$(if $(part-of-module), \
	122	$(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
80c00ba9	123	$(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
1da177e4 LT	124	quiet_modtag := $(empty) $(empty)
1da177e4 LT	125
18c167fd SL	126	$(real-objs-m) : part-of-module := y
	127	$(real-objs-m:.o=.i) : part-of-module := y
	128	$(real-objs-m:.o=.s) : part-of-module := y
	129	$(real-objs-m:.o=.lst): part-of-module := y
1da177e4 LT	130
	131	$(real-objs-m) : quiet_modtag := [M]
	132	$(real-objs-m:.o=.i) : quiet_modtag := [M]
	133	$(real-objs-m:.o=.s) : quiet_modtag := [M]
	134	$(real-objs-m:.o=.lst): quiet_modtag := [M]
	135
	136	$(obj-m) : quiet_modtag := [M]
	137
	138	# Default for not multi-part modules
5e8d780d	139	modname = $(basetarget)
1da177e4 LT	140
	141	$(multi-objs-m) : modname = $(modname-multi)
	142	$(multi-objs-m:.o=.i) : modname = $(modname-multi)
	143	$(multi-objs-m:.o=.s) : modname = $(modname-multi)
	144	$(multi-objs-m:.o=.lst) : modname = $(modname-multi)
	145	$(multi-objs-y) : modname = $(modname-multi)
	146	$(multi-objs-y:.o=.i) : modname = $(modname-multi)
	147	$(multi-objs-y:.o=.s) : modname = $(modname-multi)
	148	$(multi-objs-y:.o=.lst) : modname = $(modname-multi)
	149
	150	quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
1e64ff42	151	cmd_cc_s_c = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $<
1da177e4	152
767e581d	153	$(obj)/%.s: $(src)/%.c FORCE
1da177e4 LT	154	$(call if_changed_dep,cc_s_c)
1da177e4 LT	155
23d43848 MY	156	quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@
23d43848 MY	157	cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $<
1da177e4	158
767e581d	159	$(obj)/%.i: $(src)/%.c FORCE
23d43848	160	$(call if_changed_dep,cpp_i_c)
1da177e4	161
2ea03891	162	cmd_gensymtypes = \
37a8d9f6	163	$(CPP) -D__GENKSYMS__ $(c_flags) $< \| \
d70f82ac JH	164	$(GENKSYMS) $(if $(1), -T $(2)) \
d70f82ac JH	165	$(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \
37a8d9f6	166	$(if $(KBUILD_PRESERVE),-p) \
e26d6b83	167	-r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
37a8d9f6	168
15fde675	169	quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
37a8d9f6 SR	170	cmd_cc_symtypes_c = \
37a8d9f6 SR	171	set -e; \
e26d6b83	172	$(call cmd_gensymtypes,true,$@) >/dev/null; \
37a8d9f6	173	test -s $@ \|\| rm -f $@
15fde675	174
767e581d	175	$(obj)/%.symtypes : $(src)/%.c FORCE
64e6c1e1	176	$(call cmd,cc_symtypes_c)
15fde675	177
1da177e4 LT	178	# C (.c) files
	179	# The C file is compiled and updated dependency information is generated.
	180	# (See cmd_cc_o_c + relevant part of rule_cc_o_c)
	181
	182	quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
	183
	184	ifndef CONFIG_MODVERSIONS
	185	cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
	186
	187	else
	188	# When module versioning is enabled the following steps are executed:
2ea03891 SR	189	# o compile a .tmp_<file>.o from <file>.c
	190	# o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
	191	# not export symbols, we just rename .tmp_<file>.o to <file>.o and
1da177e4 LT	192	# are done.
	193	# o otherwise, we calculate symbol versions using the good old
	194	# genksyms on the preprocessed source and postprocess them in a way
2ea03891 SR	195	# that they are usable as a linker script
	196	# o generate <file>.o from .tmp_<file>.o using the linker to
	197	# replace the unresolved symbols __crc_exported_symbol with
	198	# the actual value of the checksum generated by genksyms
1da177e4	199
2ea03891	200	cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
e26d6b83 DZ	201	cmd_modversions = \
	202	if $(OBJDUMP) -h $(@D)/.tmp_$(@F) \| grep -q __ksymtab; then \
	203	$(call cmd_gensymtypes,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
	204	> $(@D)/.tmp_$(@F:.o=.ver); \
	205	\
	206	$(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
	207	-T $(@D)/.tmp_$(@F:.o=.ver); \
	208	rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
	209	else \
	210	mv -f $(@D)/.tmp_$(@F) $@; \
1da177e4 LT	211	fi;
	212	endif
	213
8da3821b	214	ifdef CONFIG_FTRACE_MCOUNT_RECORD
72441cb1	215	ifdef BUILD_C_RECORDMCOUNT
85356f80 SR	216	ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
	217	RECORDMCOUNT_FLAGS = -w
	218	endif
d7b4d6de SR	219	# Due to recursion, we must skip empty.o.
	220	# The empty.o file is created in the make process in order to determine
	221	# the target endianness and word size. It is made before all other C
	222	# files, including recordmcount.
45677454 WZ	223	sub_cmd_record_mcount = \
45677454 WZ	224	if [ $(@) != "scripts/mod/empty.o" ]; then \
85356f80	225	$(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \
45677454	226	fi;
d6971822 MM	227	recordmcount_source := $(srctree)/scripts/recordmcount.c \
d6971822 MM	228	$(srctree)/scripts/recordmcount.h
72441cb1	229	else
45677454	230	sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
e6299d26	231	"$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
b3acf29a	232	"$(if $(CONFIG_64BIT),64,32)" \
f9810a82 RV	233	"$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
f9810a82 RV	234	"$(LD)" "$(NM)" "$(RM)" "$(MV)" \
18c167fd	235	"$(if $(part-of-module),1,0)" "$(@)";
d6971822	236	recordmcount_source := $(srctree)/scripts/recordmcount.pl
8da3821b	237	endif
c0a80c0c HC	238	cmd_record_mcount = \
	239	if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" = \
	240	"$(CC_FLAGS_FTRACE)" ]; then \
45677454 WZ	241	$(sub_cmd_record_mcount) \
45677454 WZ	242	fi;
72441cb1	243	endif
8da3821b	244
b9ab5ebb	245	ifdef CONFIG_STACK_VALIDATION
3b27a0c8	246	ifneq ($(SKIP_STACK_VALIDATION),1)
b9ab5ebb JP	247
	248	__objtool_obj := $(objtree)/tools/objtool/objtool
	249
	250	objtool_args = check
	251	ifndef CONFIG_FRAME_POINTER
	252	objtool_args += --no-fp
	253	endif
	254
	255	# 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory
	256	# 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file
	257	# 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file
	258	cmd_objtool = $(if $(patsubst y%,, \
	259	$(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
	260	$(__objtool_obj) $(objtool_args) "$(@)";)
	261	objtool_obj = $(if $(patsubst y%,, \
	262	$(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
	263	$(__objtool_obj))
	264
3b27a0c8	265	endif # SKIP_STACK_VALIDATION
b9ab5ebb JP	266	endif # CONFIG_STACK_VALIDATION
b9ab5ebb JP	267
1da177e4	268	define rule_cc_o_c
6176aa9a	269	$(call echo-cmd,checksrc) $(cmd_checksrc) \
e4aca459	270	$(call cmd_and_fixdep,cc_o_c) \
1da177e4	271	$(cmd_modversions) \
e4aca459 NP	272	$(cmd_objtool) \
e4aca459 NP	273	$(call echo-cmd,record_mcount) $(cmd_record_mcount)
1da177e4 LT	274	endef
1da177e4 LT	275
b9ab5ebb	276	define rule_as_o_S
e4aca459 NP	277	$(call cmd_and_fixdep,as_o_S) \
e4aca459 NP	278	$(cmd_objtool)
b9ab5ebb JP	279	endef
b9ab5ebb JP	280
9895c03d NP	281	# List module undefined symbols (or empty line if not enabled)
	282	ifdef CONFIG_TRIM_UNUSED_KSYMS
	283	cmd_undef_syms = $(NM) $@ \| sed -n 's/^ \+U //p' \| xargs echo
	284	else
	285	cmd_undef_syms = echo
	286	endif
	287
1da177e4	288	# Built-in and composite module parts
b9ab5ebb	289	$(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_obj) FORCE
1da177e4 LT	290	$(call cmd,force_checksrc)
	291	$(call if_changed_rule,cc_o_c)
	292
	293	# Single-part modules are special since we need to mark them in $(MODVERDIR)
	294
b9ab5ebb	295	$(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_obj) FORCE
1da177e4 LT	296	$(call cmd,force_checksrc)
1da177e4 LT	297	$(call if_changed_rule,cc_o_c)
9895c03d NP	298	@{ echo $(@:.o=.ko); echo $@; \
9895c03d NP	299	$(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
1da177e4 LT	300
	301	quiet_cmd_cc_lst_c = MKLST $@
	302	cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
	303	$(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
	304	System.map $(OBJDUMP) > $@
	305
767e581d	306	$(obj)/%.lst: $(src)/%.c FORCE
1da177e4 LT	307	$(call if_changed_dep,cc_lst_c)
	308
	309	# Compile assembler sources (.S)
	310	# ---------------------------------------------------------------------------
	311
80c00ba9	312	modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
1da177e4	313
6588169d SR	314	$(real-objs-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
6588169d SR	315	$(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
1da177e4	316
e0f41e52 MY	317	quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@
e0f41e52 MY	318	cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $<
1da177e4	319
767e581d	320	$(obj)/%.s: $(src)/%.S FORCE
e0f41e52	321	$(call if_changed_dep,cpp_s_S)
1da177e4 LT	322
	323	quiet_cmd_as_o_S = AS $(quiet_modtag) $@
	324	cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
	325
b9ab5ebb JP	326	$(obj)/%.o: $(src)/%.S $(objtool_obj) FORCE
b9ab5ebb JP	327	$(call if_changed_rule,as_o_S)
1da177e4 LT	328
	329	targets += $(real-objs-y) $(real-objs-m) $(lib-y)
	330	targets += $(extra-y) $(MAKECMDGOALS) $(always)
	331
	332	# Linker scripts preprocessor (.lds.S -> .lds)
	333	# ---------------------------------------------------------------------------
	334	quiet_cmd_cpp_lds_S = LDS $@
51b563fc	335	cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \
42f29a25	336	-D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
1da177e4	337
767e581d	338	$(obj)/%.lds: $(src)/%.lds.S FORCE
1da177e4 LT	339	$(call if_changed_dep,cpp_lds_S)
1da177e4 LT	340
4520c6a4 DH	341	# ASN.1 grammar
	342	# ---------------------------------------------------------------------------
	343	quiet_cmd_asn1_compiler = ASN.1 $@
	344	cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
	345	$(subst .h,.c,$@) $(subst .c,.h,$@)
	346
	347	.PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.h
	348
	349	$(obj)/%-asn1.c $(obj)/%-asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
	350	$(call cmd,asn1_compiler)
	351
1da177e4 LT	352	# Build the compiled-in targets
	353	# ---------------------------------------------------------------------------
	354
	355	# To build objects in subdirs, we need to descend into the directories
	356	$(sort $(subdir-obj-y)): $(subdir-ym) ;
	357
	358	#
	359	# Rule to compile a set of .o files into one .o file
	360	#
	361	ifdef builtin-target
a5967db9 SR	362
	363	ifdef CONFIG_THIN_ARCHIVES
	364	cmd_make_builtin = rm -f $@; $(AR) rcST$(KBUILD_ARFLAGS)
	365	cmd_make_empty_builtin = rm -f $@; $(AR) rcST$(KBUILD_ARFLAGS)
	366	quiet_cmd_link_o_target = AR $@
	367	else
	368	cmd_make_builtin = $(LD) $(ld_flags) -r -o
	369	cmd_make_empty_builtin = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS)
	370	quiet_cmd_link_o_target = LD $@
	371	endif
	372
1da177e4 LT	373	# If the list of objects to link is empty, just create an empty built-in.o
1da177e4 LT	374	cmd_link_o_target = $(if $(strip $(obj-y)),\
a5967db9	375	$(cmd_make_builtin) $@ $(filter $(obj-y), $^) \
91341d4b	376	$(cmd_secanalysis),\
a5967db9	377	$(cmd_make_empty_builtin) $@)
1da177e4 LT	378
	379	$(builtin-target): $(obj-y) FORCE
	380	$(call if_changed,link_o_target)
	381
	382	targets += $(builtin-target)
	383	endif # builtin-target
	384
551559e1 TH	385	#
	386	# Rule to create modules.order file
	387	#
	388	# Create commands to either record .ko file or cat modules.order from
	389	# a subdirectory
	390	modorder-cmds = \
	391	$(foreach m, $(modorder), \
	392	$(if $(filter %/modules.order, $m), \
	393	cat $m;, echo kernel/$m;))
	394
	395	$(modorder-target): $(subdir-ym) FORCE
	396	$(Q)(cat /dev/null; $(modorder-cmds)) > $@
	397
1da177e4 LT	398	#
	399	# Rule to compile a set of .o files into one .a file
	400	#
	401	ifdef lib-target
	402	quiet_cmd_link_l_target = AR $@
a5967db9 SR	403
	404	ifdef CONFIG_THIN_ARCHIVES
	405	cmd_link_l_target = rm -f $@; $(AR) rcsT$(KBUILD_ARFLAGS) $@ $(lib-y)
	406	else
	407	cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y)
	408	endif
1da177e4 LT	409
	410	$(lib-target): $(lib-y) FORCE
	411	$(call if_changed,link_l_target)
	412
	413	targets += $(lib-target)
7f2084fa AV	414
	415	dummy-object = $(obj)/.lib_exports.o
	416	ksyms-lds = $(dot-target).lds
	417	ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
	418	ref_prefix = EXTERN(_
	419	else
	420	ref_prefix = EXTERN(
	421	endif
	422
	423	quiet_cmd_export_list = EXPORTS $@
	424	cmd_export_list = $(OBJDUMP) -h $< \| \
	425	sed -ne '/___ksymtab/{s/.+/$(ref_prefix)/;s/ ./)/;p}' >$(ksyms-lds);\
	426	rm -f $(dummy-object);\
	427	$(AR) rcs$(KBUILD_ARFLAGS) $(dummy-object);\
	428	$(LD) $(ld_flags) -r -o $@ -T $(ksyms-lds) $(dummy-object);\
	429	rm $(dummy-object) $(ksyms-lds)
	430
	431	$(obj)/lib-ksyms.o: $(lib-target) FORCE
	432	$(call if_changed,export_list)
1da177e4 LT	433	endif
	434
	435	#
	436	# Rule to link composite objects
	437	#
	438	# Composite objects are specified in kbuild makefile as follows:
	439	# <composite-object>-objs := <list of .o files>
	440	# or
	441	# <composite-object>-y := <list of .o files>
cf4f2193 MM	442	# or
	443	# <composite-object>-m := <list of .o files>
	444	# The -m syntax only works if <composite object> is a module
1da177e4 LT	445	link_multi_deps = \
	446	$(filter $(addprefix $(obj)/, \
	447	$($(subst $(obj)/,,$(@:.o=-objs))) \
cf4f2193 MM	448	$($(subst $(obj)/,,$(@:.o=-y))) \
cf4f2193 MM	449	$($(subst $(obj)/,,$(@:.o=-m)))), $^)
38385f8f	450
1da177e4	451	quiet_cmd_link_multi-y = LD $@
91341d4b	452	cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
1da177e4 LT	453
1da177e4 LT	454	quiet_cmd_link_multi-m = LD [M] $@
114f5157	455	cmd_link_multi-m = $(cmd_link_multi-y)
1da177e4	456
c8589d1e	457	$(multi-used-y): FORCE
1da177e4	458	$(call if_changed,link_multi-y)
c8589d1e	459	$(call multi_depend, $(multi-used-y), .o, -objs -y)
1da177e4	460
c8589d1e	461	$(multi-used-m): FORCE
1da177e4	462	$(call if_changed,link_multi-m)
9895c03d NP	463	@{ echo $(@:.o=.ko); echo $(link_multi_deps); \
9895c03d NP	464	$(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
cf4f2193	465	$(call multi_depend, $(multi-used-m), .o, -objs -y -m)
1da177e4 LT	466
	467	targets += $(multi-used-y) $(multi-used-m)
	468
	469
	470	# Descending
	471	# ---------------------------------------------------------------------------
	472
4f193362	473	PHONY += $(subdir-ym)
1da177e4 LT	474	$(subdir-ym):
	475	$(Q)$(MAKE) $(build)=$@
	476
	477	# Add FORCE to the prequisites of a target to force it to be always rebuilt.
	478	# ---------------------------------------------------------------------------
	479
4f193362	480	PHONY += FORCE
1da177e4 LT	481
	482	FORCE:
	483
	484	# Read all saved command lines and dependencies for the $(targets) we
	485	# may be building above, using $(if_changed{,_dep}). As an
	486	# optimization, we don't need to read them if the target does not
	487	# exist, we will rebuild anyway in that case.
	488
	489	targets := $(wildcard $(sort $(targets)))
	490	cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
	491
	492	ifneq ($(cmd_files),)
	493	include $(cmd_files)
	494	endif
4f193362	495
4f193362 PS	496	# Declare the contents of the .PHONY variable as phony. We keep that
	497	# information in a variable se we can use it in if_changed and friends.
	498
	499	.PHONY: $(PHONY)