[thirdparty/qemu.git] / rules.mak


# Don't use implicit rules or variables
# we have explicit rules for everything
MAKEFLAGS += -rR

# Files with this suffixes are final, don't try to generate them
# using implicit rules
%.d:
%.h:
%.c:
%.cc:
%.cpp:
%.m:
%.mak:

# Flags for C++ compilation
QEMU_CXXFLAGS = -D__STDC_LIMIT_MACROS $(filter-out -Wstrict-prototypes -Wmissing-prototypes -Wnested-externs -Wold-style-declaration -Wold-style-definition -Wredundant-decls, $(QEMU_CFLAGS))

# Flags for dependency generation
QEMU_DGFLAGS += -MMD -MP -MT $@ -MF $(*D)/$(*F).d

# Same as -I$(SRC_PATH) -I., but for the nested source/object directories
QEMU_INCLUDES += -I$(<D) -I$(@D)

extract-libs = $(strip $(foreach o,$1,$($o-libs)))
expand-objs = $(strip $(sort $(filter %.o,$1)) \
                  $(foreach o,$(filter %.mo,$1),$($o-objs)) \
                  $(filter-out %.o %.mo,$1))

%.o: %.c
	$(call quiet-command,$(CC) $(QEMU_INCLUDES) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) -c -o $@ $<,"  CC    $(TARGET_DIR)$@")
%.o: %.rc
	$(call quiet-command,$(WINDRES) -I. -o $@ $<,"  RC    $(TARGET_DIR)$@")

# If we have a CXX we might have some C++ objects, in which case we
# must link with the C++ compiler, not the plain C compiler.
LINKPROG = $(or $(CXX),$(CC))

ifeq ($(LIBTOOL),)
LINK = $(call quiet-command, $(LINKPROG) $(QEMU_CFLAGS) $(CFLAGS) $(LDFLAGS) -o $@ \
       $1 $(version-obj-y) $(call extract-libs,$1) $(LIBS),"  LINK  $(TARGET_DIR)$@")
else
LIBTOOL += $(if $(V),,--quiet)
%.lo: %.c
	$(call quiet-command,$(LIBTOOL) --mode=compile --tag=CC $(CC) $(QEMU_INCLUDES) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($*.o-cflags) -c -o $@ $<,"  lt CC $@")
%.lo: %.rc
	$(call quiet-command,$(LIBTOOL) --mode=compile --tag=RC $(WINDRES) -I. -o $@ $<,"lt RC   $(TARGET_DIR)$@")
%.lo: %.dtrace
	$(call quiet-command,$(LIBTOOL) --mode=compile --tag=CC dtrace -o $@ -G -s $<, " lt GEN $(TARGET_DIR)$@")

LINK = $(call quiet-command,\
       $(if $(filter %.lo %.la,$1),$(LIBTOOL) --mode=link --tag=CC \
       )$(LINKPROG) $(QEMU_CFLAGS) $(CFLAGS) $(LDFLAGS) -o $@ $1 \
       $(if $(filter %.lo %.la,$1),$(version-lobj-y),$(version-obj-y)) \
       $(if $(filter %.lo %.la,$1),$(LIBTOOLFLAGS)) \
       $(call extract-libs,$(1:.lo=.o)) $(LIBS),$(if $(filter %.lo %.la,$1),"lt LINK ", "  LINK  ")"$(TARGET_DIR)$@")
endif

%.asm: %.S
	$(call quiet-command,$(CPP) $(QEMU_INCLUDES) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) -o $@ $<,"  CPP   $(TARGET_DIR)$@")

%.o: %.asm
	$(call quiet-command,$(AS) $(ASFLAGS) -o $@ $<,"  AS    $(TARGET_DIR)$@")

%.o: %.cc
	$(call quiet-command,$(CXX) $(QEMU_INCLUDES) $(QEMU_CXXFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) -c -o $@ $<,"  CXX   $(TARGET_DIR)$@")

%.o: %.cpp
	$(call quiet-command,$(CXX) $(QEMU_INCLUDES) $(QEMU_CXXFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) -c -o $@ $<,"  CXX   $(TARGET_DIR)$@")

%.o: %.m
	$(call quiet-command,$(OBJCC) $(QEMU_INCLUDES) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) -c -o $@ $<,"  OBJC  $(TARGET_DIR)$@")

%.o: %.dtrace
	$(call quiet-command,dtrace -o $@ -G -s $<, "  GEN   $(TARGET_DIR)$@")

%$(DSOSUF): CFLAGS += -fPIC -DBUILD_DSO
%$(DSOSUF): LDFLAGS += $(LDFLAGS_SHARED)
%$(DSOSUF):
	$(call LINK,$^)
	@# Copy to build root so modules can be loaded when program started without install
	$(if $(findstring /,$@),$(call quiet-command,cp $@ $(subst /,-,$@), "  CP    $(subst /,-,$@)"))

.PHONY: modules
modules:

%$(EXESUF): %.o
	$(call LINK,$^)

%.a:
	$(call quiet-command,rm -f $@ && $(AR) rcs $@ $^,"  AR    $(TARGET_DIR)$@")

quiet-command = $(if $(V),$1,$(if $(2),@echo $2 && $1, @$1))

# cc-option
# Usage: CFLAGS+=$(call cc-option, -falign-functions=0, -malign-functions=0)

cc-option = $(if $(shell $(CC) $1 $2 -S -o /dev/null -xc /dev/null \
              >/dev/null 2>&1 && echo OK), $2, $3)

VPATH_SUFFIXES = %.c %.h %.S %.cc %.cpp %.m %.mak %.texi %.sh %.rc
set-vpath = $(if $1,$(foreach PATTERN,$(VPATH_SUFFIXES),$(eval vpath $(PATTERN) $1)))

# install-prog list, dir
define install-prog
	$(INSTALL_DIR) "$2"
	$(INSTALL_PROG) $1 "$2"
	$(if $(STRIP),$(STRIP) $(foreach T,$1,"$2/$(notdir $T)"),)
endef

# find-in-path
# Usage: $(call find-in-path, prog)
# Looks in the PATH if the argument contains no slash, else only considers one
# specific directory.  Returns an # empty string if the program doesn't exist
# there.
find-in-path = $(if $(find-string /, $1), \
        $(wildcard $1), \
        $(wildcard $(patsubst %, %/$1, $(subst :, ,$(PATH)))))

# Logical functions (for operating on y/n values like CONFIG_FOO vars)
# Inputs to these must be either "y" (true) or "n" or "" (both false)
# Output is always either "y" or "n".
# Usage: $(call land,$(CONFIG_FOO),$(CONFIG_BAR))
# Logical NOT
lnot = $(if $(subst n,,$1),n,y)
# Logical AND
land = $(if $(findstring yy,$1$2),y,n)
# Logical OR
lor = $(if $(findstring y,$1$2),y,n)
# Logical XOR (note that this is the inverse of leqv)
lxor = $(if $(filter $(call lnot,$1),$(call lnot,$2)),n,y)
# Logical equivalence (note that leqv "","n" is true)
leqv = $(if $(filter $(call lnot,$1),$(call lnot,$2)),y,n)
# Logical if: like make's $(if) but with an leqv-like test
lif = $(if $(subst n,,$1),$2,$3)

# String testing functions: inputs to these can be any string;
# the output is always either "y" or "n". Leading and trailing whitespace
# is ignored when comparing strings.
# String equality
eq = $(if $(subst $2,,$1)$(subst $1,,$2),n,y)
# String inequality
ne = $(if $(subst $2,,$1)$(subst $1,,$2),y,n)
# Emptiness/non-emptiness tests:
isempty = $(if $1,n,y)
notempty = $(if $1,y,n)

# Generate files with tracetool
TRACETOOL=$(PYTHON) $(SRC_PATH)/scripts/tracetool.py

# Generate timestamp files for .h include files

config-%.h: config-%.h-timestamp
	@cmp $< $@ >/dev/null 2>&1 || cp $< $@

config-%.h-timestamp: config-%.mak
	$(call quiet-command, sh $(SRC_PATH)/scripts/create_config < $< > $@, "  GEN   $(TARGET_DIR)config-$*.h")

.PHONY: clean-timestamp
clean-timestamp:
	rm -f *.timestamp
clean: clean-timestamp

# will delete the target of a rule if commands exit with a nonzero exit status
.DELETE_ON_ERROR:

# save-vars
# Usage: $(call save-vars, vars)
# Save each variable $v in $vars as save-vars-$v, save their object's
# variables, then clear $v.
define save-vars
    $(foreach v,$1,
        $(eval save-vars-$v := $(value $v))
        $(foreach o,$($v),
            $(foreach k,cflags libs objs,
                $(if $($o-$k),
                    $(eval save-vars-$o-$k := $($o-$k))
                    $(eval $o-$k := ))))
        $(eval $v := ))
endef

# load-vars
# Usage: $(call load-vars, vars, add_var)
# Load the saved value for each variable in @vars, and the per object
# variables.
# Append @add_var's current value to the loaded value.
define load-vars
    $(eval $2-new-value := $(value $2))
    $(foreach v,$1,
        $(eval $v := $(value save-vars-$v))
        $(foreach o,$($v),
            $(foreach k,cflags libs objs,
                $(if $(save-vars-$o-$k),
                    $(eval $o-$k := $(save-vars-$o-$k))
                    $(eval save-vars-$o-$k := ))))
        $(eval save-vars-$v := ))
    $(eval $2 := $(value $2) $($2-new-value))
endef

# fix-paths
# Usage: $(call fix-paths, obj_path, src_path, vars)
# Add prefix @obj_path to all objects in @vars, and add prefix @src_path to all
# directories in @vars.
define fix-paths
    $(foreach v,$3,
        $(foreach o,$($v),
            $(if $($o-libs),
                $(eval $1$o-libs := $($o-libs)))
            $(if $($o-cflags),
                $(eval $1$o-cflags := $($o-cflags)))
            $(if $($o-objs),
                $(eval $1$o-objs := $(addprefix $1,$($o-objs)))))
        $(eval $v := $(addprefix $1,$(filter-out %/,$($v))) \
                     $(addprefix $2,$(filter %/,$($v)))))
endef

# unnest-var-recursive
# Usage: $(call unnest-var-recursive, obj_prefix, vars, var)
#
# Unnest @var by including subdir Makefile.objs, while protect others in @vars
# unchanged.
#
# @obj_prefix is the starting point of object path prefix.
#
define unnest-var-recursive
    $(eval dirs := $(sort $(filter %/,$($3))))
    $(eval $3 := $(filter-out %/,$($3)))
    $(foreach d,$(dirs:%/=%),
            $(call save-vars,$2)
            $(eval obj := $(if $1,$1/)$d)
            $(eval -include $(SRC_PATH)/$d/Makefile.objs)
            $(call fix-paths,$(if $1,$1/)$d/,$d/,$2)
            $(call load-vars,$2,$3)
            $(call unnest-var-recursive,$1,$2,$3))
endef

# unnest-vars
# Usage: $(call unnest-vars, obj_prefix, vars)
#
# @obj_prefix: object path prefix, can be empty, or '..', etc. Don't include
# ending '/'.
#
# @vars: the list of variable names to unnest.
#
# This macro will scan subdirectories's Makefile.objs, include them, to build
# up each variable listed in @vars.
#
# Per object and per module cflags and libs are saved with relative path fixed
# as well, those variables include -libs, -cflags and -objs. Items in -objs are
# also fixed to relative path against SRC_PATH plus the prefix @obj_prefix.
#
# All nested variables postfixed by -m in names are treated as DSO variables,
# and will be built as modules, if enabled.
#
# A simple example of the unnest:
#
#     obj_prefix = ..
#     vars = hot cold
#     hot  = fire.o sun.o season/
#     cold = snow.o water/ season/
#
# Unnest through a faked source directory structure:
#
#     SRC_PATH
#        ├── water
#        │   └── Makefile.objs──────────────────┐
#        │       │ hot += steam.o               │
#        │       │ cold += ice.mo               │
#        │       │ ice.mo-libs := -licemaker    │
#        │       │ ice.mo-objs := ice1.o ice2.o │
#        │       └──────────────────────────────┘
#        │
#        └── season
#            └── Makefile.objs──────┐
#                │ hot += summer.o  │
#                │ cold += winter.o │
#                └──────────────────┘
#
# In the end, the result will be:
#
#     hot  = ../fire.o ../sun.o ../season/summer.o
#     cold = ../snow.o ../water/ice.mo ../season/winter.o
#     ../water/ice.mo-libs = -licemaker
#     ../water/ice.mo-objs = ../water/ice1.o ../water/ice2.o
#
# Note that 'hot' didn't include 'season/' in the input, so 'summer.o' is not
# included.
#
define unnest-vars
    # In the case of target build (i.e. $1 == ..), fix path for top level
    # Makefile.objs objects
    $(if $1,$(call fix-paths,$1/,,$2))

    # Descend and include every subdir Makefile.objs
    $(foreach v, $2, $(call unnest-var-recursive,$1,$2,$v))

    $(foreach v,$(filter %-m,$2),
        # All .o found in *-m variables are single object modules, create .mo
        # for them
        $(foreach o,$(filter %.o,$($v)),
            $(eval $(o:%.o=%.mo)-objs := $o))
        # Now unify .o in -m variable to .mo
        $(eval $v := $($v:%.o=%.mo))
        $(eval modules-m += $($v))

        # For module build, build shared libraries during "make modules"
        # For non-module build, add -m to -y
        $(if $(CONFIG_MODULES),
             $(eval modules: $($v:%.mo=%$(DSOSUF))),
             $(eval $(patsubst %-m,%-y,$v) += $(call expand-objs, $($v)))))

    # Post-process all the unnested vars
    $(foreach v,$2,
        $(foreach o, $(filter %.mo,$($v)),
            # Find all the .mo objects in variables and add dependency rules
            # according to .mo-objs. Report error if not set
            $(if $($o-objs),
                $(eval $(o:%.mo=%$(DSOSUF)): module-common.o $($o-objs)),
                $(error $o added in $v but $o-objs is not set))
            # Pass the .mo-cflags and .mo-libs along to member objects
            $(foreach p,$($o-objs),
                $(if $($o-cflags), $(eval $p-cflags += $($o-cflags)))
                $(if $($o-libs), $(eval $p-libs += $($o-libs)))))
        $(shell mkdir -p ./ $(sort $(dir $($v))))
        # Include all the .d files
        $(eval -include $(addsuffix *.d, $(sort $(dir $($v)))))
        $(eval $v := $(filter-out %/,$($v))))
endef
Commit	Line	Data
17759187	1
5ab28867 JQ	2	# Don't use implicit rules or variables
	3	# we have explicit rules for everything
	4	MAKEFLAGS += -rR
	5
	6	# Files with this suffixes are final, don't try to generate them
	7	# using implicit rules
	8	%.d:
	9	%.h:
	10	%.c:
c3dc9fd5	11	%.cc:
83f73fce	12	%.cpp:
5ab28867 JQ	13	%.m:
	14	%.mak:
	15
83f73fce TS	16	# Flags for C++ compilation
	17	QEMU_CXXFLAGS = -D__STDC_LIMIT_MACROS $(filter-out -Wstrict-prototypes -Wmissing-prototypes -Wnested-externs -Wold-style-declaration -Wold-style-definition -Wredundant-decls, $(QEMU_CFLAGS))
	18
7ebf54bc	19	# Flags for dependency generation
a71cd2a5	20	QEMU_DGFLAGS += -MMD -MP -MT $@ -MF $(D)/$(F).d
02d5467e	21
9d9199a0	22	# Same as -I$(SRC_PATH) -I., but for the nested source/object directories
7e7da8e3	23	QEMU_INCLUDES += -I$(<D) -I$(@D)
9d9199a0	24
f2770151	25	extract-libs = $(strip $(foreach o,$1,$($o-libs)))
17969268 FZ	26	expand-objs = $(strip $(sort $(filter %.o,$1)) \
	27	$(foreach o,$(filter %.mo,$1),$($o-objs)) \
	28	$(filter-out %.o %.mo,$1))
5c0d52bc	29
0e8c9214	30	%.o: %.c
5c0d52bc	31	$(call quiet-command,$(CC) $(QEMU_INCLUDES) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) -c -o $@ $<," CC $(TARGET_DIR)$@")
6821cdc7 PB	32	%.o: %.rc
6821cdc7 PB	33	$(call quiet-command,$(WINDRES) -I. -o $@ $<," RC $(TARGET_DIR)$@")
17759187	34
3144f78b PM	35	# If we have a CXX we might have some C++ objects, in which case we
	36	# must link with the C++ compiler, not the plain C compiler.
	37	LINKPROG = $(or $(CXX),$(CC))
	38
44dc0ca3	39	ifeq ($(LIBTOOL),)
1c33ac57 FZ	40	LINK = $(call quiet-command, $(LINKPROG) $(QEMU_CFLAGS) $(CFLAGS) $(LDFLAGS) -o $@ \
1c33ac57 FZ	41	$1 $(version-obj-y) $(call extract-libs,$1) $(LIBS)," LINK $(TARGET_DIR)$@")
44dc0ca3	42	else
f141ccfa	43	LIBTOOL += $(if $(V),,--quiet)
44dc0ca3	44	%.lo: %.c
0db564ee	45	$(call quiet-command,$(LIBTOOL) --mode=compile --tag=CC $(CC) $(QEMU_INCLUDES) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($*.o-cflags) -c -o $@ $<," lt CC $@")
6821cdc7 PB	46	%.lo: %.rc
6821cdc7 PB	47	$(call quiet-command,$(LIBTOOL) --mode=compile --tag=RC $(WINDRES) -I. -o $@ $<,"lt RC $(TARGET_DIR)$@")
2c13ec50 PB	48	%.lo: %.dtrace
	49	$(call quiet-command,$(LIBTOOL) --mode=compile --tag=CC dtrace -o $@ -G -s $<, " lt GEN $(TARGET_DIR)$@")
	50
21655882	51	LINK = $(call quiet-command,\
17969268	52	$(if $(filter %.lo %.la,$1),$(LIBTOOL) --mode=link --tag=CC \
1c33ac57	53	)$(LINKPROG) $(QEMU_CFLAGS) $(CFLAGS) $(LDFLAGS) -o $@ $1 \
17969268 FZ	54	$(if $(filter %.lo %.la,$1),$(version-lobj-y),$(version-obj-y)) \
17969268 FZ	55	$(if $(filter %.lo %.la,$1),$(LIBTOOLFLAGS)) \
0db564ee	56	$(call extract-libs,$(1:.lo=.o)) $(LIBS),$(if $(filter %.lo %.la,$1),"lt LINK ", " LINK ")"$(TARGET_DIR)$@")
44dc0ca3 AL	57	endif
44dc0ca3 AL	58
3dd46c78 BS	59	%.asm: %.S
	60	$(call quiet-command,$(CPP) $(QEMU_INCLUDES) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) -o $@ $<," CPP $(TARGET_DIR)$@")
	61
	62	%.o: %.asm
	63	$(call quiet-command,$(AS) $(ASFLAGS) -o $@ $<," AS $(TARGET_DIR)$@")
17759187	64
c3dc9fd5	65	%.o: %.cc
0db564ee	66	$(call quiet-command,$(CXX) $(QEMU_INCLUDES) $(QEMU_CXXFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) -c -o $@ $<," CXX $(TARGET_DIR)$@")
c3dc9fd5	67
83f73fce	68	%.o: %.cpp
0db564ee	69	$(call quiet-command,$(CXX) $(QEMU_INCLUDES) $(QEMU_CXXFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) -c -o $@ $<," CXX $(TARGET_DIR)$@")
83f73fce	70
17759187	71	%.o: %.m
0db564ee	72	$(call quiet-command,$(OBJCC) $(QEMU_INCLUDES) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) -c -o $@ $<," OBJC $(TARGET_DIR)$@")
17759187	73
2c13ec50 PB	74	%.o: %.dtrace
	75	$(call quiet-command,dtrace -o $@ -G -s $<, " GEN $(TARGET_DIR)$@")
	76
1c33ac57	77	%$(DSOSUF): CFLAGS += -fPIC -DBUILD_DSO
17969268	78	%$(DSOSUF): LDFLAGS += $(LDFLAGS_SHARED)
1c33ac57	79	%$(DSOSUF):
17969268	80	$(call LINK,$^)
e26110cf FZ	81	@# Copy to build root so modules can be loaded when program started without install
e26110cf FZ	82	$(if $(findstring /,$@),$(call quiet-command,cp $@ $(subst /,-,$@), " CP $(subst /,-,$@)"))
17969268 FZ	83
	84	.PHONY: modules
	85	modules:
	86
3aa892d7	87	%$(EXESUF): %.o
0bfe3ca5	88	$(call LINK,$^)
4f188f88	89
93a0dba7	90	%.a:
28c699a2	91	$(call quiet-command,rm -f $@ && $(AR) rcs $@ $^," AR $(TARGET_DIR)$@")
93a0dba7	92
28c699a2	93	quiet-command = $(if $(V),$1,$(if $(2),@echo $2 && $1, @$1))
70071e17 JQ	94
70071e17 JQ	95	# cc-option
8a2e6ab5	96	# Usage: CFLAGS+=$(call cc-option, -falign-functions=0, -malign-functions=0)
70071e17	97
fc3baad7 TM	98	cc-option = $(if $(shell $(CC) $1 $2 -S -o /dev/null -xc /dev/null \
fc3baad7 TM	99	>/dev/null 2>&1 && echo OK), $2, $3)
1215c6e7	100
c3dc9fd5	101	VPATH_SUFFIXES = %.c %.h %.S %.cc %.cpp %.m %.mak %.texi %.sh %.rc
288e7bcc	102	set-vpath = $(if $1,$(foreach PATTERN,$(VPATH_SUFFIXES),$(eval vpath $(PATTERN) $1)))
076d2471	103
0d659426 MT	104	# install-prog list, dir
	105	define install-prog
	106	$(INSTALL_DIR) "$2"
	107	$(INSTALL_PROG) $1 "$2"
	108	$(if $(STRIP),$(STRIP) $(foreach T,$1,"$2/$(notdir $T)"),)
	109	endef
	110
2b2e59e6 PB	111	# find-in-path
	112	# Usage: $(call find-in-path, prog)
	113	# Looks in the PATH if the argument contains no slash, else only considers one
	114	# specific directory. Returns an # empty string if the program doesn't exist
	115	# there.
	116	find-in-path = $(if $(find-string /, $1), \
	117	$(wildcard $1), \
	118	$(wildcard $(patsubst %, %/$1, $(subst :, ,$(PATH)))))
	119
837a2e26 PM	120	# Logical functions (for operating on y/n values like CONFIG_FOO vars)
	121	# Inputs to these must be either "y" (true) or "n" or "" (both false)
	122	# Output is always either "y" or "n".
	123	# Usage: $(call land,$(CONFIG_FOO),$(CONFIG_BAR))
	124	# Logical NOT
	125	lnot = $(if $(subst n,,$1),n,y)
	126	# Logical AND
	127	land = $(if $(findstring yy,$1$2),y,n)
	128	# Logical OR
	129	lor = $(if $(findstring y,$1$2),y,n)
	130	# Logical XOR (note that this is the inverse of leqv)
	131	lxor = $(if $(filter $(call lnot,$1),$(call lnot,$2)),n,y)
	132	# Logical equivalence (note that leqv "","n" is true)
	133	leqv = $(if $(filter $(call lnot,$1),$(call lnot,$2)),y,n)
	134	# Logical if: like make's $(if) but with an leqv-like test
	135	lif = $(if $(subst n,,$1),$2,$3)
	136
9ef622e3 PM	137	# String testing functions: inputs to these can be any string;
	138	# the output is always either "y" or "n". Leading and trailing whitespace
	139	# is ignored when comparing strings.
	140	# String equality
	141	eq = $(if $(subst $2,,$1)$(subst $1,,$2),n,y)
	142	# String inequality
	143	ne = $(if $(subst $2,,$1)$(subst $1,,$2),y,n)
	144	# Emptiness/non-emptiness tests:
	145	isempty = $(if $1,n,y)
	146	notempty = $(if $1,y,n)
	147
c0424934 LV	148	# Generate files with tracetool
	149	TRACETOOL=$(PYTHON) $(SRC_PATH)/scripts/tracetool.py
	150
1215c6e7 JQ	151	# Generate timestamp files for .h include files
1215c6e7 JQ	152
4b25966a MT	153	config-%.h: config-%.h-timestamp
4b25966a MT	154	@cmp $< $@ >/dev/null 2>&1 \|\| cp $< $@
1215c6e7	155
4b25966a MT	156	config-%.h-timestamp: config-%.mak
4b25966a MT	157	$(call quiet-command, sh $(SRC_PATH)/scripts/create_config < $< > $@, " GEN $(TARGET_DIR)config-$*.h")
7dbbbb0c	158
7586317b MT	159	.PHONY: clean-timestamp
	160	clean-timestamp:
	161	rm -f *.timestamp
	162	clean: clean-timestamp
	163
7dbbbb0c MT	164	# will delete the target of a rule if commands exit with a nonzero exit status
7dbbbb0c MT	165	.DELETE_ON_ERROR:
e05804ee	166
1c33ac57 FZ	167	# save-vars
	168	# Usage: $(call save-vars, vars)
	169	# Save each variable $v in $vars as save-vars-$v, save their object's
	170	# variables, then clear $v.
	171	define save-vars
	172	$(foreach v,$1,
	173	$(eval save-vars-$v := $(value $v))
	174	$(foreach o,$($v),
	175	$(foreach k,cflags libs objs,
	176	$(if $($o-$k),
	177	$(eval save-vars-$o-$k := $($o-$k))
	178	$(eval $o-$k := ))))
	179	$(eval $v := ))
5c0d52bc FZ	180	endef
5c0d52bc FZ	181
1c33ac57 FZ	182	# load-vars
	183	# Usage: $(call load-vars, vars, add_var)
	184	# Load the saved value for each variable in @vars, and the per object
	185	# variables.
	186	# Append @add_var's current value to the loaded value.
	187	define load-vars
	188	$(eval $2-new-value := $(value $2))
	189	$(foreach v,$1,
	190	$(eval $v := $(value save-vars-$v))
	191	$(foreach o,$($v),
	192	$(foreach k,cflags libs objs,
	193	$(if $(save-vars-$o-$k),
	194	$(eval $o-$k := $(save-vars-$o-$k))
	195	$(eval save-vars-$o-$k := ))))
	196	$(eval save-vars-$v := ))
	197	$(eval $2 := $(value $2) $($2-new-value))
e05804ee PB	198	endef
e05804ee PB	199
1c33ac57 FZ	200	# fix-paths
	201	# Usage: $(call fix-paths, obj_path, src_path, vars)
	202	# Add prefix @obj_path to all objects in @vars, and add prefix @src_path to all
	203	# directories in @vars.
	204	define fix-paths
	205	$(foreach v,$3,
	206	$(foreach o,$($v),
	207	$(if $($o-libs),
	208	$(eval $1$o-libs := $($o-libs)))
	209	$(if $($o-cflags),
	210	$(eval $1$o-cflags := $($o-cflags)))
	211	$(if $($o-objs),
	212	$(eval $1$o-objs := $(addprefix $1,$($o-objs)))))
	213	$(eval $v := $(addprefix $1,$(filter-out %/,$($v))) \
	214	$(addprefix $2,$(filter %/,$($v)))))
e05804ee PB	215	endef
e05804ee PB	216
1c33ac57 FZ	217	# unnest-var-recursive
	218	# Usage: $(call unnest-var-recursive, obj_prefix, vars, var)
	219	#
	220	# Unnest @var by including subdir Makefile.objs, while protect others in @vars
	221	# unchanged.
	222	#
	223	# @obj_prefix is the starting point of object path prefix.
	224	#
	225	define unnest-var-recursive
	226	$(eval dirs := $(sort $(filter %/,$($3))))
	227	$(eval $3 := $(filter-out %/,$($3)))
	228	$(foreach d,$(dirs:%/=%),
	229	$(call save-vars,$2)
	230	$(eval obj := $(if $1,$1/)$d)
	231	$(eval -include $(SRC_PATH)/$d/Makefile.objs)
	232	$(call fix-paths,$(if $1,$1/)$d/,$d/,$2)
	233	$(call load-vars,$2,$3)
	234	$(call unnest-var-recursive,$1,$2,$3))
17969268 FZ	235	endef
17969268 FZ	236
1c33ac57 FZ	237	# unnest-vars
	238	# Usage: $(call unnest-vars, obj_prefix, vars)
	239	#
	240	# @obj_prefix: object path prefix, can be empty, or '..', etc. Don't include
	241	# ending '/'.
	242	#
	243	# @vars: the list of variable names to unnest.
	244	#
	245	# This macro will scan subdirectories's Makefile.objs, include them, to build
	246	# up each variable listed in @vars.
	247	#
	248	# Per object and per module cflags and libs are saved with relative path fixed
	249	# as well, those variables include -libs, -cflags and -objs. Items in -objs are
	250	# also fixed to relative path against SRC_PATH plus the prefix @obj_prefix.
	251	#
	252	# All nested variables postfixed by -m in names are treated as DSO variables,
	253	# and will be built as modules, if enabled.
	254	#
	255	# A simple example of the unnest:
	256	#
	257	# obj_prefix = ..
	258	# vars = hot cold
	259	# hot = fire.o sun.o season/
	260	# cold = snow.o water/ season/
	261	#
	262	# Unnest through a faked source directory structure:
	263	#
	264	# SRC_PATH
	265	# ├── water
	266	# │ └── Makefile.objs──────────────────┐
	267	# │ │ hot += steam.o │
	268	# │ │ cold += ice.mo │
	269	# │ │ ice.mo-libs := -licemaker │
	270	# │ │ ice.mo-objs := ice1.o ice2.o │
	271	# │ └──────────────────────────────┘
	272	# │
	273	# └── season
	274	# └── Makefile.objs──────┐
	275	# │ hot += summer.o │
	276	# │ cold += winter.o │
	277	# └──────────────────┘
	278	#
	279	# In the end, the result will be:
	280	#
	281	# hot = ../fire.o ../sun.o ../season/summer.o
	282	# cold = ../snow.o ../water/ice.mo ../season/winter.o
	283	# ../water/ice.mo-libs = -licemaker
	284	# ../water/ice.mo-objs = ../water/ice1.o ../water/ice2.o
	285	#
	286	# Note that 'hot' didn't include 'season/' in the input, so 'summer.o' is not
	287	# included.
	288	#
e05804ee	289	define unnest-vars
1c33ac57 FZ	290	# In the case of target build (i.e. $1 == ..), fix path for top level
	291	# Makefile.objs objects
	292	$(if $1,$(call fix-paths,$1/,,$2))
	293
	294	# Descend and include every subdir Makefile.objs
	295	$(foreach v, $2, $(call unnest-var-recursive,$1,$2,$v))
	296
	297	$(foreach v,$(filter %-m,$2),
	298	# All .o found in *-m variables are single object modules, create .mo
	299	# for them
	300	$(foreach o,$(filter %.o,$($v)),
	301	$(eval $(o:%.o=%.mo)-objs := $o))
	302	# Now unify .o in -m variable to .mo
	303	$(eval $v := $($v:%.o=%.mo))
	304	$(eval modules-m += $($v))
	305
	306	# For module build, build shared libraries during "make modules"
	307	# For non-module build, add -m to -y
	308	$(if $(CONFIG_MODULES),
	309	$(eval modules: $($v:%.mo=%$(DSOSUF))),
	310	$(eval $(patsubst %-m,%-y,$v) += $(call expand-objs, $($v)))))
	311
	312	# Post-process all the unnested vars
	313	$(foreach v,$2,
	314	$(foreach o, $(filter %.mo,$($v)),
	315	# Find all the .mo objects in variables and add dependency rules
	316	# according to .mo-objs. Report error if not set
	317	$(if $($o-objs),
	318	$(eval $(o:%.mo=%$(DSOSUF)): module-common.o $($o-objs)),
	319	$(error $o added in $v but $o-objs is not set))
	320	# Pass the .mo-cflags and .mo-libs along to member objects
	321	$(foreach p,$($o-objs),
	322	$(if $($o-cflags), $(eval $p-cflags += $($o-cflags)))
	323	$(if $($o-libs), $(eval $p-libs += $($o-libs)))))
	324	$(shell mkdir -p ./ $(sort $(dir $($v))))
	325	# Include all the .d files
	326	$(eval -include $(addsuffix *.d, $(sort $(dir $($v)))))
	327	$(eval $v := $(filter-out %/,$($v))))
e05804ee	328	endef