[mirror_ubuntu-zesty-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

#
# make W=... settings
#
# W=1 - warnings that may be relevant and does not occur too often
# W=2 - warnings that occur quite often but may still be relevant
# W=3 - the more obscure warnings, can most likely be ignored
#
# $(call cc-option, -W...) handles gcc -W.. options which
# are not supported by all versions of the compiler
ifdef KBUILD_ENABLE_EXTRA_GCC_CHECKS
warning-  := $(empty)

warning-1 := -Wextra -Wunused -Wno-unused-parameter
warning-1 += -Wmissing-declarations
warning-1 += -Wmissing-format-attribute
warning-1 += $(call cc-option, -Wmissing-prototypes)
warning-1 += -Wold-style-definition
warning-1 += $(call cc-option, -Wmissing-include-dirs)
warning-1 += $(call cc-option, -Wunused-but-set-variable)
warning-1 += $(call cc-disable-warning, missing-field-initializers)

# Clang
warning-1 += $(call cc-disable-warning, initializer-overrides)
warning-1 += $(call cc-disable-warning, unused-value)
warning-1 += $(call cc-disable-warning, format)
warning-1 += $(call cc-disable-warning, unknown-warning-option)
warning-1 += $(call cc-disable-warning, sign-compare)
warning-1 += $(call cc-disable-warning, format-zero-length)
warning-1 += $(call cc-disable-warning, uninitialized)
warning-1 += $(call cc-option, -fcatch-undefined-behavior)

warning-2 := -Waggregate-return
warning-2 += -Wcast-align
warning-2 += -Wdisabled-optimization
warning-2 += -Wnested-externs
warning-2 += -Wshadow
warning-2 += $(call cc-option, -Wlogical-op)
warning-2 += $(call cc-option, -Wmissing-field-initializers)

warning-3 := -Wbad-function-cast
warning-3 += -Wcast-qual
warning-3 += -Wconversion
warning-3 += -Wpacked
warning-3 += -Wpadded
warning-3 += -Wpointer-arith
warning-3 += -Wredundant-decls
warning-3 += -Wswitch-default
warning-3 += $(call cc-option, -Wpacked-bitfield-compat)
warning-3 += $(call cc-option, -Wvla)

warning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
warning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
warning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))

ifeq ("$(strip $(warning))","")
        $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown)
endif

KBUILD_CFLAGS += $(warning)
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-) $(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)

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 -pg,$(_c_flags))" = "-pg" ]; then	\
		$(sub_cmd_record_mcount)			\
	fi;
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 $(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)

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)

# 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)

# 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)")
49c57d25	49	$(error CFLAGS was changed in "$(kbuild-file)". Fix it to use ccflags-y)
0c53c8e6 SR	50	endif
0c53c8e6 SR	51	endif
4a5838ad BP	52
4a5838ad BP	53	#
28bc20dc	54	# make W=... settings
4a5838ad	55	#
28bc20dc SR	56	# W=1 - warnings that may be relevant and does not occur too often
	57	# W=2 - warnings that occur quite often but may still be relevant
	58	# W=3 - the more obscure warnings, can most likely be ignored
	59	#
	60	# $(call cc-option, -W...) handles gcc -W.. options which
4a5838ad BP	61	# are not supported by all versions of the compiler
4a5838ad BP	62	ifdef KBUILD_ENABLE_EXTRA_GCC_CHECKS
a6de553d MM	63	warning- := $(empty)
a6de553d MM	64
28bc20dc SR	65	warning-1 := -Wextra -Wunused -Wno-unused-parameter
	66	warning-1 += -Wmissing-declarations
	67	warning-1 += -Wmissing-format-attribute
3d3d6b84	68	warning-1 += $(call cc-option, -Wmissing-prototypes)
28bc20dc SR	69	warning-1 += -Wold-style-definition
28bc20dc SR	70	warning-1 += $(call cc-option, -Wmissing-include-dirs)
af0e5d56	71	warning-1 += $(call cc-option, -Wunused-but-set-variable)
f858ee8b	72	warning-1 += $(call cc-disable-warning, missing-field-initializers)
28bc20dc	73
3d3d6b84 JSM	74	# Clang
	75	warning-1 += $(call cc-disable-warning, initializer-overrides)
	76	warning-1 += $(call cc-disable-warning, unused-value)
	77	warning-1 += $(call cc-disable-warning, format)
	78	warning-1 += $(call cc-disable-warning, unknown-warning-option)
	79	warning-1 += $(call cc-disable-warning, sign-compare)
	80	warning-1 += $(call cc-disable-warning, format-zero-length)
	81	warning-1 += $(call cc-disable-warning, uninitialized)
	82	warning-1 += $(call cc-option, -fcatch-undefined-behavior)
	83
28bc20dc SR	84	warning-2 := -Waggregate-return
	85	warning-2 += -Wcast-align
	86	warning-2 += -Wdisabled-optimization
	87	warning-2 += -Wnested-externs
	88	warning-2 += -Wshadow
	89	warning-2 += $(call cc-option, -Wlogical-op)
f858ee8b	90	warning-2 += $(call cc-option, -Wmissing-field-initializers)
28bc20dc SR	91
	92	warning-3 := -Wbad-function-cast
	93	warning-3 += -Wcast-qual
	94	warning-3 += -Wconversion
	95	warning-3 += -Wpacked
	96	warning-3 += -Wpadded
	97	warning-3 += -Wpointer-arith
	98	warning-3 += -Wredundant-decls
	99	warning-3 += -Wswitch-default
	100	warning-3 += $(call cc-option, -Wpacked-bitfield-compat)
	101	warning-3 += $(call cc-option, -Wvla)
	102
a6de553d MM	103	warning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
	104	warning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
	105	warning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
28bc20dc	106
a6de553d	107	ifeq ("$(strip $(warning))","")
28bc20dc SR	108	$(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown)
	109	endif
	110
	111	KBUILD_CFLAGS += $(warning)
4a5838ad BP	112	endif
4a5838ad BP	113
1da177e4 LT	114	include scripts/Makefile.lib
	115
	116	ifdef host-progs
	117	ifneq ($(hostprogs-y),$(host-progs))
	118	$(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
	119	hostprogs-y += $(host-progs)
	120	endif
	121	endif
	122
3156fd05	123	# Do not include host rules unless needed
1da177e4 LT	124	ifneq ($(hostprogs-y)$(hostprogs-m),)
	125	include scripts/Makefile.host
	126	endif
	127
	128	ifneq ($(KBUILD_SRC),)
	129	# Create output directory if not already present
	130	_dummy := $(shell [ -d $(obj) ] \|\| mkdir -p $(obj))
	131
	132	# Create directories for object files if directory does not exist
	133	# Needed when obj-y := dir/file.o syntax is used
	134	_dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] \|\| mkdir -p $(d)))
	135	endif
	136
1da177e4 LT	137	ifndef obj
	138	$(warning kbuild: Makefile.build is included improperly)
	139	endif
	140
	141	# ===========================================================================
	142
	143	ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),)
	144	lib-target := $(obj)/lib.a
	145	endif
	146
4b024242	147	ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(subdir-m) $(lib-target)),)
1da177e4 LT	148	builtin-target := $(obj)/built-in.o
	149	endif
	150
551559e1 TH	151	modorder-target := $(obj)/modules.order
551559e1 TH	152
1da177e4 LT	153	# We keep a list of all modules in $(MODVERDIR)
	154
	155	__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
551559e1	156	$(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
1da177e4 LT	157	$(subdir-ym) $(always)
	158	@:
	159
	160	# Linus' kernel sanity checking tool
	161	ifneq ($(KBUILD_CHECKSRC),0)
	162	ifeq ($(KBUILD_CHECKSRC),2)
	163	quiet_cmd_force_checksrc = CHECK $<
	164	cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
	165	else
	166	quiet_cmd_checksrc = CHECK $<
	167	cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
	168	endif
	169	endif
	170
91341d4b SR	171	# Do section mismatch analysis for each module/built-in.o
	172	ifdef CONFIG_DEBUG_SECTION_MISMATCH
	173	cmd_secanalysis = ; scripts/mod/modpost $@
	174	endif
1da177e4 LT	175
	176	# Compile C sources (.c)
	177	# ---------------------------------------------------------------------------
	178
	179	# Default is built-in, unless we know otherwise
6588169d SR	180	modkern_cflags = \
	181	$(if $(part-of-module), \
	182	$(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
80c00ba9	183	$(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
1da177e4 LT	184	quiet_modtag := $(empty) $(empty)
1da177e4 LT	185
18c167fd SL	186	$(real-objs-m) : part-of-module := y
	187	$(real-objs-m:.o=.i) : part-of-module := y
	188	$(real-objs-m:.o=.s) : part-of-module := y
	189	$(real-objs-m:.o=.lst): part-of-module := y
1da177e4 LT	190
	191	$(real-objs-m) : quiet_modtag := [M]
	192	$(real-objs-m:.o=.i) : quiet_modtag := [M]
	193	$(real-objs-m:.o=.s) : quiet_modtag := [M]
	194	$(real-objs-m:.o=.lst): quiet_modtag := [M]
	195
	196	$(obj-m) : quiet_modtag := [M]
	197
	198	# Default for not multi-part modules
5e8d780d	199	modname = $(basetarget)
1da177e4 LT	200
	201	$(multi-objs-m) : modname = $(modname-multi)
	202	$(multi-objs-m:.o=.i) : modname = $(modname-multi)
	203	$(multi-objs-m:.o=.s) : modname = $(modname-multi)
	204	$(multi-objs-m:.o=.lst) : modname = $(modname-multi)
	205	$(multi-objs-y) : modname = $(modname-multi)
	206	$(multi-objs-y:.o=.i) : modname = $(modname-multi)
	207	$(multi-objs-y:.o=.s) : modname = $(modname-multi)
	208	$(multi-objs-y:.o=.lst) : modname = $(modname-multi)
	209
	210	quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
1e64ff42	211	cmd_cc_s_c = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $<
1da177e4	212
767e581d	213	$(obj)/%.s: $(src)/%.c FORCE
1da177e4 LT	214	$(call if_changed_dep,cc_s_c)
	215
	216	quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@
	217	cmd_cc_i_c = $(CPP) $(c_flags) -o $@ $<
	218
767e581d	219	$(obj)/%.i: $(src)/%.c FORCE
1da177e4 LT	220	$(call if_changed_dep,cc_i_c)
1da177e4 LT	221
2ea03891	222	cmd_gensymtypes = \
37a8d9f6	223	$(CPP) -D__GENKSYMS__ $(c_flags) $< \| \
d70f82ac JH	224	$(GENKSYMS) $(if $(1), -T $(2)) \
d70f82ac JH	225	$(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \
37a8d9f6	226	$(if $(KBUILD_PRESERVE),-p) \
e26d6b83	227	-r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
37a8d9f6	228
15fde675	229	quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
37a8d9f6 SR	230	cmd_cc_symtypes_c = \
37a8d9f6 SR	231	set -e; \
e26d6b83	232	$(call cmd_gensymtypes,true,$@) >/dev/null; \
37a8d9f6	233	test -s $@ \|\| rm -f $@
15fde675	234
767e581d	235	$(obj)/%.symtypes : $(src)/%.c FORCE
64e6c1e1	236	$(call cmd,cc_symtypes_c)
15fde675	237
1da177e4 LT	238	# C (.c) files
	239	# The C file is compiled and updated dependency information is generated.
	240	# (See cmd_cc_o_c + relevant part of rule_cc_o_c)
	241
	242	quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
	243
	244	ifndef CONFIG_MODVERSIONS
	245	cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
	246
	247	else
	248	# When module versioning is enabled the following steps are executed:
2ea03891 SR	249	# o compile a .tmp_<file>.o from <file>.c
	250	# o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
	251	# not export symbols, we just rename .tmp_<file>.o to <file>.o and
1da177e4 LT	252	# are done.
	253	# o otherwise, we calculate symbol versions using the good old
	254	# genksyms on the preprocessed source and postprocess them in a way
2ea03891 SR	255	# that they are usable as a linker script
	256	# o generate <file>.o from .tmp_<file>.o using the linker to
	257	# replace the unresolved symbols __crc_exported_symbol with
	258	# the actual value of the checksum generated by genksyms
1da177e4	259
2ea03891	260	cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
e26d6b83 DZ	261	cmd_modversions = \
	262	if $(OBJDUMP) -h $(@D)/.tmp_$(@F) \| grep -q __ksymtab; then \
	263	$(call cmd_gensymtypes,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
	264	> $(@D)/.tmp_$(@F:.o=.ver); \
	265	\
	266	$(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
	267	-T $(@D)/.tmp_$(@F:.o=.ver); \
	268	rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
	269	else \
	270	mv -f $(@D)/.tmp_$(@F) $@; \
1da177e4 LT	271	fi;
	272	endif
	273
8da3821b	274	ifdef CONFIG_FTRACE_MCOUNT_RECORD
72441cb1	275	ifdef BUILD_C_RECORDMCOUNT
85356f80 SR	276	ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
	277	RECORDMCOUNT_FLAGS = -w
	278	endif
d7b4d6de SR	279	# Due to recursion, we must skip empty.o.
	280	# The empty.o file is created in the make process in order to determine
	281	# the target endianness and word size. It is made before all other C
	282	# files, including recordmcount.
45677454 WZ	283	sub_cmd_record_mcount = \
45677454 WZ	284	if [ $(@) != "scripts/mod/empty.o" ]; then \
85356f80	285	$(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \
45677454	286	fi;
d6971822 MM	287	recordmcount_source := $(srctree)/scripts/recordmcount.c \
d6971822 MM	288	$(srctree)/scripts/recordmcount.h
72441cb1	289	else
45677454	290	sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
e6299d26	291	"$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
b3acf29a	292	"$(if $(CONFIG_64BIT),64,32)" \
f9810a82 RV	293	"$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
f9810a82 RV	294	"$(LD)" "$(NM)" "$(RM)" "$(MV)" \
18c167fd	295	"$(if $(part-of-module),1,0)" "$(@)";
d6971822	296	recordmcount_source := $(srctree)/scripts/recordmcount.pl
8da3821b	297	endif
45677454 WZ	298	cmd_record_mcount = \
	299	if [ "$(findstring -pg,$(_c_flags))" = "-pg" ]; then \
	300	$(sub_cmd_record_mcount) \
	301	fi;
72441cb1	302	endif
8da3821b	303
1da177e4	304	define rule_cc_o_c
6176aa9a JB	305	$(call echo-cmd,checksrc) $(cmd_checksrc) \
6176aa9a JB	306	$(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \
1da177e4	307	$(cmd_modversions) \
c3c63b6b	308	$(call echo-cmd,record_mcount) \
8da3821b	309	$(cmd_record_mcount) \
48f1f058 SR	310	scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > \
48f1f058 SR	311	$(dot-target).tmp; \
2ea03891	312	rm -f $(depfile); \
48f1f058	313	mv -f $(dot-target).tmp $(dot-target).cmd
1da177e4 LT	314	endef
	315
	316	# Built-in and composite module parts
d6971822	317	$(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
1da177e4 LT	318	$(call cmd,force_checksrc)
	319	$(call if_changed_rule,cc_o_c)
	320
	321	# Single-part modules are special since we need to mark them in $(MODVERDIR)
	322
d6971822	323	$(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
1da177e4 LT	324	$(call cmd,force_checksrc)
	325	$(call if_changed_rule,cc_o_c)
	326	@{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)
	327
	328	quiet_cmd_cc_lst_c = MKLST $@
	329	cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
	330	$(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
	331	System.map $(OBJDUMP) > $@
	332
767e581d	333	$(obj)/%.lst: $(src)/%.c FORCE
1da177e4 LT	334	$(call if_changed_dep,cc_lst_c)
	335
	336	# Compile assembler sources (.S)
	337	# ---------------------------------------------------------------------------
	338
80c00ba9	339	modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
1da177e4	340
6588169d SR	341	$(real-objs-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
6588169d SR	342	$(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
1da177e4 LT	343
	344	quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
	345	cmd_as_s_S = $(CPP) $(a_flags) -o $@ $<
	346
767e581d	347	$(obj)/%.s: $(src)/%.S FORCE
1da177e4 LT	348	$(call if_changed_dep,as_s_S)
	349
	350	quiet_cmd_as_o_S = AS $(quiet_modtag) $@
	351	cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
	352
767e581d	353	$(obj)/%.o: $(src)/%.S FORCE
1da177e4 LT	354	$(call if_changed_dep,as_o_S)
	355
	356	targets += $(real-objs-y) $(real-objs-m) $(lib-y)
	357	targets += $(extra-y) $(MAKECMDGOALS) $(always)
	358
	359	# Linker scripts preprocessor (.lds.S -> .lds)
	360	# ---------------------------------------------------------------------------
	361	quiet_cmd_cpp_lds_S = LDS $@
51b563fc	362	cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \
42f29a25	363	-D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
1da177e4	364
767e581d	365	$(obj)/%.lds: $(src)/%.lds.S FORCE
1da177e4 LT	366	$(call if_changed_dep,cpp_lds_S)
1da177e4 LT	367
4520c6a4 DH	368	# ASN.1 grammar
	369	# ---------------------------------------------------------------------------
	370	quiet_cmd_asn1_compiler = ASN.1 $@
	371	cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
	372	$(subst .h,.c,$@) $(subst .c,.h,$@)
	373
	374	.PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.h
	375
	376	$(obj)/%-asn1.c $(obj)/%-asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
	377	$(call cmd,asn1_compiler)
	378
1da177e4 LT	379	# Build the compiled-in targets
	380	# ---------------------------------------------------------------------------
	381
	382	# To build objects in subdirs, we need to descend into the directories
	383	$(sort $(subdir-obj-y)): $(subdir-ym) ;
	384
	385	#
	386	# Rule to compile a set of .o files into one .o file
	387	#
	388	ifdef builtin-target
	389	quiet_cmd_link_o_target = LD $@
	390	# If the list of objects to link is empty, just create an empty built-in.o
	391	cmd_link_o_target = $(if $(strip $(obj-y)),\
91341d4b SR	392	$(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \
91341d4b SR	393	$(cmd_secanalysis),\
40df759e	394	rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@)
1da177e4 LT	395
	396	$(builtin-target): $(obj-y) FORCE
	397	$(call if_changed,link_o_target)
	398
	399	targets += $(builtin-target)
	400	endif # builtin-target
	401
551559e1 TH	402	#
	403	# Rule to create modules.order file
	404	#
	405	# Create commands to either record .ko file or cat modules.order from
	406	# a subdirectory
	407	modorder-cmds = \
	408	$(foreach m, $(modorder), \
	409	$(if $(filter %/modules.order, $m), \
	410	cat $m;, echo kernel/$m;))
	411
	412	$(modorder-target): $(subdir-ym) FORCE
	413	$(Q)(cat /dev/null; $(modorder-cmds)) > $@
	414
1da177e4 LT	415	#
	416	# Rule to compile a set of .o files into one .a file
	417	#
	418	ifdef lib-target
	419	quiet_cmd_link_l_target = AR $@
40df759e	420	cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y)
1da177e4 LT	421
	422	$(lib-target): $(lib-y) FORCE
	423	$(call if_changed,link_l_target)
	424
	425	targets += $(lib-target)
	426	endif
	427
	428	#
	429	# Rule to link composite objects
	430	#
	431	# Composite objects are specified in kbuild makefile as follows:
	432	# <composite-object>-objs := <list of .o files>
	433	# or
	434	# <composite-object>-y := <list of .o files>
	435	link_multi_deps = \
	436	$(filter $(addprefix $(obj)/, \
	437	$($(subst $(obj)/,,$(@:.o=-objs))) \
	438	$($(subst $(obj)/,,$(@:.o=-y)))), $^)
	439
	440	quiet_cmd_link_multi-y = LD $@
91341d4b	441	cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
1da177e4 LT	442
1da177e4 LT	443	quiet_cmd_link_multi-m = LD [M] $@
114f5157	444	cmd_link_multi-m = $(cmd_link_multi-y)
1da177e4 LT	445
	446	# We would rather have a list of rules like
	447	# foo.o: $(foo-objs)
	448	# but that's not so easy, so we rather make all composite objects depend
	449	# on the set of all their parts
	450	$(multi-used-y) : %.o: $(multi-objs-y) FORCE
	451	$(call if_changed,link_multi-y)
	452
	453	$(multi-used-m) : %.o: $(multi-objs-m) FORCE
	454	$(call if_changed,link_multi-m)
	455	@{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
	456
	457	targets += $(multi-used-y) $(multi-used-m)
	458
	459
	460	# Descending
	461	# ---------------------------------------------------------------------------
	462
4f193362	463	PHONY += $(subdir-ym)
1da177e4 LT	464	$(subdir-ym):
	465	$(Q)$(MAKE) $(build)=$@
	466
	467	# Add FORCE to the prequisites of a target to force it to be always rebuilt.
	468	# ---------------------------------------------------------------------------
	469
4f193362	470	PHONY += FORCE
1da177e4 LT	471
	472	FORCE:
	473
	474	# Read all saved command lines and dependencies for the $(targets) we
	475	# may be building above, using $(if_changed{,_dep}). As an
	476	# optimization, we don't need to read them if the target does not
	477	# exist, we will rebuild anyway in that case.
	478
	479	targets := $(wildcard $(sort $(targets)))
	480	cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
	481
	482	ifneq ($(cmd_files),)
	483	include $(cmd_files)
	484	endif
4f193362	485
4f193362 PS	486	# Declare the contents of the .PHONY variable as phony. We keep that
	487	# information in a variable se we can use it in if_changed and friends.
	488
	489	.PHONY: $(PHONY)