[mirror_ubuntu-artful-kernel.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),)
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
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_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)

# These mirror gensymtypes_S and co below, keep them in synch.
cmd_gensymtypes_c =                                                         \
    $(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;                                                                 \
    $(call cmd_gensymtypes_c,true,$@) >/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_c =								\
	if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then		\
		$(call cmd_gensymtypes_c,$(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_RETPOLINE
cmd_ubuntu_retpoline = $(CONFIG_SHELL) $(srctree)/scripts/ubuntu-retpoline-extract-one $(@) $(<) "$(filter -m16 %code16gcc.h,$(a_flags))";
else
cmd_ubuntu_retpoline =
endif

define rule_cc_o_c
	$(call echo-cmd,checksrc) $(cmd_checksrc)			  \
	$(call echo-cmd,cc_o_c) $(cmd_cc_o_c);				  \
	$(cmd_modversions_c)						  \
	$(call echo-cmd,ubuntu-retpoline) $(cmd_ubuntu_retpoline)	  \
	$(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

define rule_as_o_S
       $(call echo-cmd,as_o_S) $(cmd_as_o_S);                            \
       scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,as_o_S)' >    \
                                                     $(dot-target).tmp;  \
       $(cmd_modversions_S)						 \
       $(call echo-cmd,ubuntu-retpoline) $(cmd_ubuntu_retpoline)	 \
       rm -f $(depfile);                                                 \
       mv -f $(dot-target).tmp $(dot-target).cmd
endef

# Built-in and composite module parts
$(obj)/%.o: $(src)/%.c $(recordmcount_source) 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) 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 := $(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)

# .S file exports must have their C prototypes defined in asm/asm-prototypes.h
# or a file that it includes, in order to get versioned symbols. We build a
# dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from
# the .S file (with trailing ';'), and run genksyms on that, to extract vers.
#
# This is convoluted. The .S file must first be preprocessed to run guards and
# expand names, then the resulting exports must be constructed into plain
# EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed
# to make the genksyms input.
#
# These mirror gensymtypes_c and co above, keep them in synch.
cmd_gensymtypes_S =                                                         \
    (echo "\#include <linux/kernel.h>" ;                                    \
     echo "\#include <asm/asm-prototypes.h>" ;                              \
    $(CPP) $(a_flags) $< |                                                  \
      grep "\<___EXPORT_SYMBOL\>" |                                          \
      sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ) | \
    $(CPP) -D__GENKSYMS__ $(c_flags) -xc - |                                \
    $(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_S = SYM $(quiet_modtag) $@
cmd_cc_symtypes_S =                                                         \
    set -e;                                                                 \
    $(call cmd_gensymtypes_S,true,$@) >/dev/null;                           \
    test -s $@ || rm -f $@

$(obj)/%.symtypes : $(src)/%.S FORCE
	$(call cmd,cc_symtypes_S)

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)  $@

ifndef CONFIG_MODVERSIONS
cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<

else

ASM_PROTOTYPES := $(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/asm-prototypes.h)

ifeq ($(ASM_PROTOTYPES),)
cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<

else

# versioning matches the C process described above, with difference that
# we parse asm-prototypes.h C header to get function definitions.

cmd_as_o_S = $(CC) $(a_flags) -c -o $(@D)/.tmp_$(@F) $<

cmd_modversions_S =								\
	if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then		\
		$(call cmd_gensymtypes_S,$(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
endif

$(obj)/%.o: $(src)/%.S 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
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 $@; $(AR) rcs$(KBUILD_ARFLAGS) $@)

$(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 $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(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)

$(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); } > $(MODVERDIR)/$(@F:.o=.mod)
$(call multi_depend, $(multi-used-m), .o, -objs -y)

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 += $(host-progs)
	59	endif
	60	endif
	61
3156fd05	62	# Do not include host rules unless needed
1da177e4 LT	63	ifneq ($(hostprogs-y)$(hostprogs-m),)
	64	include scripts/Makefile.host
	65	endif
	66
	67	ifneq ($(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 LT	83	lib-target := $(obj)/lib.a
	84	endif
	85
a4954fd7	86	ifneq ($(strip $(obj-y) $(obj-m) $(obj-) $(subdir-m) $(lib-target)),)
1da177e4 LT	87	builtin-target := $(obj)/built-in.o
	88	endif
	89
551559e1 TH	90	modorder-target := $(obj)/modules.order
551559e1 TH	91
1da177e4 LT	92	# We keep a list of all modules in $(MODVERDIR)
	93
	94	__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
551559e1	95	$(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
1da177e4 LT	96	$(subdir-ym) $(always)
	97	@:
	98
	99	# Linus' kernel sanity checking tool
	100	ifneq ($(KBUILD_CHECKSRC),0)
	101	ifeq ($(KBUILD_CHECKSRC),2)
	102	quiet_cmd_force_checksrc = CHECK $<
	103	cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
	104	else
	105	quiet_cmd_checksrc = CHECK $<
	106	cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
	107	endif
	108	endif
	109
91341d4b SR	110	# Do section mismatch analysis for each module/built-in.o
	111	ifdef CONFIG_DEBUG_SECTION_MISMATCH
	112	cmd_secanalysis = ; scripts/mod/modpost $@
	113	endif
1da177e4 LT	114
	115	# Compile C sources (.c)
	116	# ---------------------------------------------------------------------------
	117
	118	# Default is built-in, unless we know otherwise
6588169d SR	119	modkern_cflags = \
	120	$(if $(part-of-module), \
	121	$(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
80c00ba9	122	$(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
1da177e4 LT	123	quiet_modtag := $(empty) $(empty)
1da177e4 LT	124
18c167fd SL	125	$(real-objs-m) : part-of-module := y
	126	$(real-objs-m:.o=.i) : part-of-module := y
	127	$(real-objs-m:.o=.s) : part-of-module := y
	128	$(real-objs-m:.o=.lst): part-of-module := y
1da177e4 LT	129
	130	$(real-objs-m) : quiet_modtag := [M]
	131	$(real-objs-m:.o=.i) : quiet_modtag := [M]
	132	$(real-objs-m:.o=.s) : quiet_modtag := [M]
	133	$(real-objs-m:.o=.lst): quiet_modtag := [M]
	134
	135	$(obj-m) : quiet_modtag := [M]
	136
	137	# Default for not multi-part modules
5e8d780d	138	modname = $(basetarget)
1da177e4 LT	139
	140	$(multi-objs-m) : modname = $(modname-multi)
	141	$(multi-objs-m:.o=.i) : modname = $(modname-multi)
	142	$(multi-objs-m:.o=.s) : modname = $(modname-multi)
	143	$(multi-objs-m:.o=.lst) : modname = $(modname-multi)
	144	$(multi-objs-y) : modname = $(modname-multi)
	145	$(multi-objs-y:.o=.i) : modname = $(modname-multi)
	146	$(multi-objs-y:.o=.s) : modname = $(modname-multi)
	147	$(multi-objs-y:.o=.lst) : modname = $(modname-multi)
	148
	149	quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
1e64ff42	150	cmd_cc_s_c = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $<
1da177e4	151
767e581d	152	$(obj)/%.s: $(src)/%.c FORCE
1da177e4 LT	153	$(call if_changed_dep,cc_s_c)
	154
	155	quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@
	156	cmd_cc_i_c = $(CPP) $(c_flags) -o $@ $<
	157
767e581d	158	$(obj)/%.i: $(src)/%.c FORCE
1da177e4 LT	159	$(call if_changed_dep,cc_i_c)
1da177e4 LT	160
0c7de3e0 NP	161	# These mirror gensymtypes_S and co below, keep them in synch.
0c7de3e0 NP	162	cmd_gensymtypes_c = \
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; \
0c7de3e0	172	$(call cmd_gensymtypes_c,true,$@) >/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) $<
0c7de3e0 NP	201
0c7de3e0 NP	202	cmd_modversions_c = \
e26d6b83	203	if $(OBJDUMP) -h $(@D)/.tmp_$(@F) \| grep -q __ksymtab; then \
0c7de3e0	204	$(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
e26d6b83 DZ	205	> $(@D)/.tmp_$(@F:.o=.ver); \
	206	\
	207	$(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
	208	-T $(@D)/.tmp_$(@F:.o=.ver); \
	209	rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
	210	else \
	211	mv -f $(@D)/.tmp_$(@F) $@; \
1da177e4 LT	212	fi;
	213	endif
	214
8da3821b	215	ifdef CONFIG_FTRACE_MCOUNT_RECORD
72441cb1	216	ifdef BUILD_C_RECORDMCOUNT
85356f80 SR	217	ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
	218	RECORDMCOUNT_FLAGS = -w
	219	endif
d7b4d6de SR	220	# Due to recursion, we must skip empty.o.
	221	# The empty.o file is created in the make process in order to determine
	222	# the target endianness and word size. It is made before all other C
	223	# files, including recordmcount.
45677454 WZ	224	sub_cmd_record_mcount = \
45677454 WZ	225	if [ $(@) != "scripts/mod/empty.o" ]; then \
85356f80	226	$(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \
45677454	227	fi;
d6971822 MM	228	recordmcount_source := $(srctree)/scripts/recordmcount.c \
d6971822 MM	229	$(srctree)/scripts/recordmcount.h
72441cb1	230	else
45677454	231	sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
e6299d26	232	"$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
b3acf29a	233	"$(if $(CONFIG_64BIT),64,32)" \
f9810a82 RV	234	"$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
f9810a82 RV	235	"$(LD)" "$(NM)" "$(RM)" "$(MV)" \
18c167fd	236	"$(if $(part-of-module),1,0)" "$(@)";
d6971822	237	recordmcount_source := $(srctree)/scripts/recordmcount.pl
8da3821b	238	endif
c0a80c0c HC	239	cmd_record_mcount = \
	240	if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" = \
	241	"$(CC_FLAGS_FTRACE)" ]; then \
45677454 WZ	242	$(sub_cmd_record_mcount) \
45677454 WZ	243	fi;
72441cb1	244	endif
8da3821b	245
c452e5f0	246	ifdef CONFIG_RETPOLINE
2cf4e273	247	cmd_ubuntu_retpoline = $(CONFIG_SHELL) $(srctree)/scripts/ubuntu-retpoline-extract-one $(@) $(<) "$(filter -m16 %code16gcc.h,$(a_flags))";
c452e5f0 AW	248	else
	249	cmd_ubuntu_retpoline =
	250	endif
	251
1da177e4	252	define rule_cc_o_c
6176aa9a JB	253	$(call echo-cmd,checksrc) $(cmd_checksrc) \
6176aa9a JB	254	$(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \
0c7de3e0	255	$(cmd_modversions_c) \
c452e5f0	256	$(call echo-cmd,ubuntu-retpoline) $(cmd_ubuntu_retpoline) \
c3c63b6b	257	$(call echo-cmd,record_mcount) \
8da3821b	258	$(cmd_record_mcount) \
48f1f058 SR	259	scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > \
48f1f058 SR	260	$(dot-target).tmp; \
2ea03891	261	rm -f $(depfile); \
48f1f058	262	mv -f $(dot-target).tmp $(dot-target).cmd
1da177e4 LT	263	endef
1da177e4 LT	264
0c7de3e0 NP	265	define rule_as_o_S
	266	$(call echo-cmd,as_o_S) $(cmd_as_o_S); \
	267	scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,as_o_S)' > \
	268	$(dot-target).tmp; \
	269	$(cmd_modversions_S) \
c452e5f0	270	$(call echo-cmd,ubuntu-retpoline) $(cmd_ubuntu_retpoline) \
0c7de3e0 NP	271	rm -f $(depfile); \
	272	mv -f $(dot-target).tmp $(dot-target).cmd
	273	endef
	274
1da177e4	275	# Built-in and composite module parts
d6971822	276	$(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
1da177e4 LT	277	$(call cmd,force_checksrc)
	278	$(call if_changed_rule,cc_o_c)
	279
	280	# Single-part modules are special since we need to mark them in $(MODVERDIR)
	281
d6971822	282	$(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
1da177e4 LT	283	$(call cmd,force_checksrc)
	284	$(call if_changed_rule,cc_o_c)
	285	@{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)
	286
	287	quiet_cmd_cc_lst_c = MKLST $@
	288	cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
	289	$(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
	290	System.map $(OBJDUMP) > $@
	291
767e581d	292	$(obj)/%.lst: $(src)/%.c FORCE
1da177e4 LT	293	$(call if_changed_dep,cc_lst_c)
	294
	295	# Compile assembler sources (.S)
	296	# ---------------------------------------------------------------------------
	297
80c00ba9	298	modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
1da177e4	299
6588169d SR	300	$(real-objs-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
6588169d SR	301	$(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
1da177e4	302
0c7de3e0 NP	303	# .S file exports must have their C prototypes defined in asm/asm-prototypes.h
	304	# or a file that it includes, in order to get versioned symbols. We build a
	305	# dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from
	306	# the .S file (with trailing ';'), and run genksyms on that, to extract vers.
	307	#
	308	# This is convoluted. The .S file must first be preprocessed to run guards and
	309	# expand names, then the resulting exports must be constructed into plain
	310	# EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed
	311	# to make the genksyms input.
	312	#
	313	# These mirror gensymtypes_c and co above, keep them in synch.
	314	cmd_gensymtypes_S = \
	315	(echo "\#include <linux/kernel.h>" ; \
	316	echo "\#include <asm/asm-prototypes.h>" ; \
	317	$(CPP) $(a_flags) $< \| \
	318	grep "\<___EXPORT_SYMBOL\>" \| \
	319	sed 's/.___EXPORT_SYMBOL[[:space:]]\([a-zA-Z0-9_]\)[[:space:]],.*/EXPORT_SYMBOL(\1);/' ) \| \
	320	$(CPP) -D__GENKSYMS__ $(c_flags) -xc - \| \
	321	$(GENKSYMS) $(if $(1), -T $(2)) \
	322	$(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \
	323	$(if $(KBUILD_PRESERVE),-p) \
	324	-r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
	325
	326	quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@
	327	cmd_cc_symtypes_S = \
	328	set -e; \
	329	$(call cmd_gensymtypes_S,true,$@) >/dev/null; \
	330	test -s $@ \|\| rm -f $@
	331
	332	$(obj)/%.symtypes : $(src)/%.S FORCE
	333	$(call cmd,cc_symtypes_S)
	334
1da177e4	335	quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
38385f8f	336	cmd_as_s_S = $(CPP) $(a_flags) -o $@ $<
1da177e4	337
767e581d	338	$(obj)/%.s: $(src)/%.S FORCE
1da177e4 LT	339	$(call if_changed_dep,as_s_S)
	340
	341	quiet_cmd_as_o_S = AS $(quiet_modtag) $@
0c7de3e0 NP	342
	343	ifndef CONFIG_MODVERSIONS
	344	cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
	345
	346	else
	347
	348	ASM_PROTOTYPES := $(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/asm-prototypes.h)
	349
	350	ifeq ($(ASM_PROTOTYPES),)
	351	cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
	352
	353	else
	354
	355	# versioning matches the C process described above, with difference that
	356	# we parse asm-prototypes.h C header to get function definitions.
	357
	358	cmd_as_o_S = $(CC) $(a_flags) -c -o $(@D)/.tmp_$(@F) $<
	359
	360	cmd_modversions_S = \
	361	if $(OBJDUMP) -h $(@D)/.tmp_$(@F) \| grep -q __ksymtab; then \
	362	$(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
	363	> $(@D)/.tmp_$(@F:.o=.ver); \
	364	\
	365	$(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
	366	-T $(@D)/.tmp_$(@F:.o=.ver); \
	367	rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
	368	else \
	369	mv -f $(@D)/.tmp_$(@F) $@; \
	370	fi;
	371	endif
	372	endif
1da177e4	373
767e581d	374	$(obj)/%.o: $(src)/%.S FORCE
0c7de3e0	375	$(call if_changed_rule,as_o_S)
1da177e4 LT	376
	377	targets += $(real-objs-y) $(real-objs-m) $(lib-y)
	378	targets += $(extra-y) $(MAKECMDGOALS) $(always)
	379
	380	# Linker scripts preprocessor (.lds.S -> .lds)
	381	# ---------------------------------------------------------------------------
	382	quiet_cmd_cpp_lds_S = LDS $@
51b563fc	383	cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \
42f29a25	384	-D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
1da177e4	385
767e581d	386	$(obj)/%.lds: $(src)/%.lds.S FORCE
1da177e4 LT	387	$(call if_changed_dep,cpp_lds_S)
1da177e4 LT	388
4520c6a4 DH	389	# ASN.1 grammar
	390	# ---------------------------------------------------------------------------
	391	quiet_cmd_asn1_compiler = ASN.1 $@
	392	cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
	393	$(subst .h,.c,$@) $(subst .c,.h,$@)
	394
	395	.PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.h
	396
	397	$(obj)/%-asn1.c $(obj)/%-asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
	398	$(call cmd,asn1_compiler)
	399
1da177e4 LT	400	# Build the compiled-in targets
	401	# ---------------------------------------------------------------------------
	402
	403	# To build objects in subdirs, we need to descend into the directories
	404	$(sort $(subdir-obj-y)): $(subdir-ym) ;
	405
	406	#
	407	# Rule to compile a set of .o files into one .o file
	408	#
	409	ifdef builtin-target
	410	quiet_cmd_link_o_target = LD $@
	411	# If the list of objects to link is empty, just create an empty built-in.o
	412	cmd_link_o_target = $(if $(strip $(obj-y)),\
91341d4b SR	413	$(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \
91341d4b SR	414	$(cmd_secanalysis),\
40df759e	415	rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@)
1da177e4 LT	416
	417	$(builtin-target): $(obj-y) FORCE
	418	$(call if_changed,link_o_target)
	419
	420	targets += $(builtin-target)
	421	endif # builtin-target
	422
551559e1 TH	423	#
	424	# Rule to create modules.order file
	425	#
	426	# Create commands to either record .ko file or cat modules.order from
	427	# a subdirectory
	428	modorder-cmds = \
	429	$(foreach m, $(modorder), \
	430	$(if $(filter %/modules.order, $m), \
	431	cat $m;, echo kernel/$m;))
	432
	433	$(modorder-target): $(subdir-ym) FORCE
	434	$(Q)(cat /dev/null; $(modorder-cmds)) > $@
	435
1da177e4 LT	436	#
	437	# Rule to compile a set of .o files into one .a file
	438	#
	439	ifdef lib-target
	440	quiet_cmd_link_l_target = AR $@
40df759e	441	cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y)
1da177e4 LT	442
	443	$(lib-target): $(lib-y) FORCE
	444	$(call if_changed,link_l_target)
	445
	446	targets += $(lib-target)
	447	endif
	448
	449	#
	450	# Rule to link composite objects
	451	#
	452	# Composite objects are specified in kbuild makefile as follows:
	453	# <composite-object>-objs := <list of .o files>
	454	# or
	455	# <composite-object>-y := <list of .o files>
	456	link_multi_deps = \
	457	$(filter $(addprefix $(obj)/, \
	458	$($(subst $(obj)/,,$(@:.o=-objs))) \
	459	$($(subst $(obj)/,,$(@:.o=-y)))), $^)
38385f8f	460
1da177e4	461	quiet_cmd_link_multi-y = LD $@
91341d4b	462	cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
1da177e4 LT	463
1da177e4 LT	464	quiet_cmd_link_multi-m = LD [M] $@
114f5157	465	cmd_link_multi-m = $(cmd_link_multi-y)
1da177e4	466
c8589d1e	467	$(multi-used-y): FORCE
1da177e4	468	$(call if_changed,link_multi-y)
c8589d1e	469	$(call multi_depend, $(multi-used-y), .o, -objs -y)
1da177e4	470
c8589d1e	471	$(multi-used-m): FORCE
1da177e4 LT	472	$(call if_changed,link_multi-m)
1da177e4 LT	473	@{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
c8589d1e	474	$(call multi_depend, $(multi-used-m), .o, -objs -y)
1da177e4 LT	475
	476	targets += $(multi-used-y) $(multi-used-m)
	477
	478
	479	# Descending
	480	# ---------------------------------------------------------------------------
	481
4f193362	482	PHONY += $(subdir-ym)
1da177e4 LT	483	$(subdir-ym):
	484	$(Q)$(MAKE) $(build)=$@
	485
	486	# Add FORCE to the prequisites of a target to force it to be always rebuilt.
	487	# ---------------------------------------------------------------------------
	488
4f193362	489	PHONY += FORCE
1da177e4 LT	490
	491	FORCE:
	492
	493	# Read all saved command lines and dependencies for the $(targets) we
	494	# may be building above, using $(if_changed{,_dep}). As an
	495	# optimization, we don't need to read them if the target does not
	496	# exist, we will rebuild anyway in that case.
	497
	498	targets := $(wildcard $(sort $(targets)))
	499	cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
	500
	501	ifneq ($(cmd_files),)
	502	include $(cmd_files)
	503	endif
4f193362	504
4f193362 PS	505	# Declare the contents of the .PHONY variable as phony. We keep that
	506	# information in a variable se we can use it in if_changed and friends.
	507
	508	.PHONY: $(PHONY)