[mirror_qemu.git] / rules.mak


COMMA := ,

# 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)

WL_U := -Wl,-u,
find-symbols = $(if $1, $(sort $(shell $(NM) -P -g $1 | $2)))
defined-symbols = $(call find-symbols,$1,awk '$$2!="U"{print $$1}')
undefined-symbols = $(call find-symbols,$1,awk '$$2=="U"{print $$1}')

# All the .mo objects in -m variables are also added into corresponding -y
# variable in unnest-vars, but filtered out here, when LINK is called.
#
# The .mo objects are supposed to be linked as a DSO, for module build. So here
# they are only used as a placeholders to generate those "archive undefined"
# symbol options (-Wl,-u,$symbol_name), which are the archive functions
# referenced by the code in the DSO.
#
# Also the presence in -y variables will also guarantee they are built before
# linking executables that will load them. So we can look up symbol reference
# in LINK.
#
# This is necessary because the exectuable itself may not use the function, in
# which case the function would not be linked in. Then the DSO loading will
# fail because of the missing symbol.
process-archive-undefs = $(filter-out %.a %.mo,$1) \
                $(addprefix $(WL_U), \
                     $(filter $(call defined-symbols,$(filter %.a, $1)), \
                              $(call undefined-symbols,$(filter %.mo,$1)))) \
                $(filter %.a,$1)

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))

LINK = $(call quiet-command, $(LINKPROG) $(QEMU_CFLAGS) $(CFLAGS) $(LDFLAGS) -o $@ \
       $(call process-archive-undefs, $1) \
       $(version-obj-y) $(call extract-libs,$1) $(LIBS),"  LINK  $(TARGET_DIR)$@")

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

%.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   $(TARGET_DIR)$@")

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


LD_REL := $(CC) -nostdlib -Wl,-r $(LD_REL_FLAGS)

%.mo:
	$(call quiet-command,$(LD_REL) -o $@ $^,"  LD -r $(TARGET_DIR)$@")

.PHONY: modules
modules:

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

%.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 $(SRC_PATH)/scripts/create_config
	$(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)
        # Pass the .mo-cflags and .mo-libs along to its member objects
        $(foreach o, $(filter %.mo,$($v)),
            $(foreach p,$($o-objs),
                $(if $($o-cflags), $(eval $p-cflags += $($o-cflags)))
                $(if $($o-libs), $(eval $p-libs += $($o-libs))))))

    # For all %.mo objects that are directly added into -y, just expand them
    $(foreach v,$(filter %-y,$2),
        $(eval $v := $(foreach o,$($v),$(if $($o-objs),$($o-objs),$o))))

    $(foreach v,$(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),
             $(foreach o,$($v),
                   $(eval $($o-objs): CFLAGS += $(DSO_OBJ_CFLAGS))
                   $(eval $o: $($o-objs)))
             $(eval $(patsubst %-m,%-y,$v) += $($v))
             $(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)))
        $(shell mkdir -p ./ $(sort $(dir $($v))))
        # Include all the .d files
        $(eval -include $(patsubst %.o,%.d,$(patsubst %.mo,%.d,$($v))))
        $(eval $v := $(filter-out %/,$($v))))
endef
Commit	Line	Data
17759187	1
2f4e4dc2 FZ	2	COMMA := ,
2f4e4dc2 FZ	3
5ab28867 JQ	4	# Don't use implicit rules or variables
	5	# we have explicit rules for everything
	6	MAKEFLAGS += -rR
	7
	8	# Files with this suffixes are final, don't try to generate them
	9	# using implicit rules
	10	%.d:
	11	%.h:
	12	%.c:
c3dc9fd5	13	%.cc:
83f73fce	14	%.cpp:
5ab28867 JQ	15	%.m:
	16	%.mak:
	17
83f73fce TS	18	# Flags for C++ compilation
	19	QEMU_CXXFLAGS = -D__STDC_LIMIT_MACROS $(filter-out -Wstrict-prototypes -Wmissing-prototypes -Wnested-externs -Wold-style-declaration -Wold-style-definition -Wredundant-decls, $(QEMU_CFLAGS))
	20
7ebf54bc	21	# Flags for dependency generation
998b7b1d	22	QEMU_DGFLAGS += -MMD -MP -MT $@ -MF $(@D)/$(*F).d
02d5467e	23
9d9199a0	24	# Same as -I$(SRC_PATH) -I., but for the nested source/object directories
7e7da8e3	25	QEMU_INCLUDES += -I$(<D) -I$(@D)
9d9199a0	26
c261d774	27	WL_U := -Wl,-u,
4852ee95	28	find-symbols = $(if $1, $(sort $(shell $(NM) -P -g $1 \| $2)))
c261d774 FZ	29	defined-symbols = $(call find-symbols,$1,awk '$$2!="U"{print $$1}')
	30	undefined-symbols = $(call find-symbols,$1,awk '$$2=="U"{print $$1}')
	31
	32	# All the .mo objects in -m variables are also added into corresponding -y
	33	# variable in unnest-vars, but filtered out here, when LINK is called.
	34	#
	35	# The .mo objects are supposed to be linked as a DSO, for module build. So here
	36	# they are only used as a placeholders to generate those "archive undefined"
	37	# symbol options (-Wl,-u,$symbol_name), which are the archive functions
	38	# referenced by the code in the DSO.
	39	#
	40	# Also the presence in -y variables will also guarantee they are built before
	41	# linking executables that will load them. So we can look up symbol reference
	42	# in LINK.
	43	#
	44	# This is necessary because the exectuable itself may not use the function, in
	45	# which case the function would not be linked in. Then the DSO loading will
	46	# fail because of the missing symbol.
	47	process-archive-undefs = $(filter-out %.a %.mo,$1) \
	48	$(addprefix $(WL_U), \
	49	$(filter $(call defined-symbols,$(filter %.a, $1)), \
	50	$(call undefined-symbols,$(filter %.mo,$1)))) \
	51	$(filter %.a,$1)
	52
f2770151	53	extract-libs = $(strip $(foreach o,$1,$($o-libs)))
17969268 FZ	54	expand-objs = $(strip $(sort $(filter %.o,$1)) \
	55	$(foreach o,$(filter %.mo,$1),$($o-objs)) \
	56	$(filter-out %.o %.mo,$1))
5c0d52bc	57
0e8c9214	58	%.o: %.c
5c0d52bc	59	$(call quiet-command,$(CC) $(QEMU_INCLUDES) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) -c -o $@ $<," CC $(TARGET_DIR)$@")
6821cdc7 PB	60	%.o: %.rc
6821cdc7 PB	61	$(call quiet-command,$(WINDRES) -I. -o $@ $<," RC $(TARGET_DIR)$@")
17759187	62
3144f78b PM	63	# If we have a CXX we might have some C++ objects, in which case we
	64	# must link with the C++ compiler, not the plain C compiler.
	65	LINKPROG = $(or $(CXX),$(CC))
	66
1c33ac57	67	LINK = $(call quiet-command, $(LINKPROG) $(QEMU_CFLAGS) $(CFLAGS) $(LDFLAGS) -o $@ \
c261d774 FZ	68	$(call process-archive-undefs, $1) \
c261d774 FZ	69	$(version-obj-y) $(call extract-libs,$1) $(LIBS)," LINK $(TARGET_DIR)$@")
44dc0ca3	70
5f6f0e27	71	%.o: %.S
cdbd727c	72	$(call quiet-command,$(CCAS) $(QEMU_INCLUDES) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) -c -o $@ $<," CCAS $(TARGET_DIR)$@")
17759187	73
c3dc9fd5	74	%.o: %.cc
0db564ee	75	$(call quiet-command,$(CXX) $(QEMU_INCLUDES) $(QEMU_CXXFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) -c -o $@ $<," CXX $(TARGET_DIR)$@")
c3dc9fd5	76
83f73fce	77	%.o: %.cpp
0db564ee	78	$(call quiet-command,$(CXX) $(QEMU_INCLUDES) $(QEMU_CXXFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) -c -o $@ $<," CXX $(TARGET_DIR)$@")
83f73fce	79
17759187	80	%.o: %.m
0db564ee	81	$(call quiet-command,$(OBJCC) $(QEMU_INCLUDES) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) -c -o $@ $<," OBJC $(TARGET_DIR)$@")
17759187	82
2c13ec50 PB	83	%.o: %.dtrace
	84	$(call quiet-command,dtrace -o $@ -G -s $<, " GEN $(TARGET_DIR)$@")
	85
d24697e1 FZ	86	DSO_OBJ_CFLAGS := -fPIC -DBUILD_DSO
d24697e1 FZ	87	module-common.o: CFLAGS += $(DSO_OBJ_CFLAGS)
17969268	88	%$(DSOSUF): LDFLAGS += $(LDFLAGS_SHARED)
c261d774	89	%$(DSOSUF): %.mo
17969268	90	$(call LINK,$^)
e26110cf FZ	91	@# Copy to build root so modules can be loaded when program started without install
e26110cf FZ	92	$(if $(findstring /,$@),$(call quiet-command,cp $@ $(subst /,-,$@), " CP $(subst /,-,$@)"))
17969268	93
c261d774	94
6969ec6c	95	LD_REL := $(CC) -nostdlib -Wl,-r $(LD_REL_FLAGS)
c261d774 FZ	96
	97	%.mo:
	98	$(call quiet-command,$(LD_REL) -o $@ $^," LD -r $(TARGET_DIR)$@")
	99
17969268 FZ	100	.PHONY: modules
	101	modules:
	102
3aa892d7	103	%$(EXESUF): %.o
cefa2bbd	104	$(call LINK,$(filter %.o %.a %.mo, $^))
4f188f88	105
93a0dba7	106	%.a:
28c699a2	107	$(call quiet-command,rm -f $@ && $(AR) rcs $@ $^," AR $(TARGET_DIR)$@")
93a0dba7	108
28c699a2	109	quiet-command = $(if $(V),$1,$(if $(2),@echo $2 && $1, @$1))
70071e17 JQ	110
70071e17 JQ	111	# cc-option
8a2e6ab5	112	# Usage: CFLAGS+=$(call cc-option, -falign-functions=0, -malign-functions=0)
70071e17	113
fc3baad7 TM	114	cc-option = $(if $(shell $(CC) $1 $2 -S -o /dev/null -xc /dev/null \
fc3baad7 TM	115	>/dev/null 2>&1 && echo OK), $2, $3)
1215c6e7	116
c3dc9fd5	117	VPATH_SUFFIXES = %.c %.h %.S %.cc %.cpp %.m %.mak %.texi %.sh %.rc
288e7bcc	118	set-vpath = $(if $1,$(foreach PATTERN,$(VPATH_SUFFIXES),$(eval vpath $(PATTERN) $1)))
076d2471	119
0d659426 MT	120	# install-prog list, dir
	121	define install-prog
	122	$(INSTALL_DIR) "$2"
	123	$(INSTALL_PROG) $1 "$2"
	124	$(if $(STRIP),$(STRIP) $(foreach T,$1,"$2/$(notdir $T)"),)
	125	endef
	126
2b2e59e6 PB	127	# find-in-path
	128	# Usage: $(call find-in-path, prog)
	129	# Looks in the PATH if the argument contains no slash, else only considers one
	130	# specific directory. Returns an # empty string if the program doesn't exist
	131	# there.
	132	find-in-path = $(if $(find-string /, $1), \
	133	$(wildcard $1), \
	134	$(wildcard $(patsubst %, %/$1, $(subst :, ,$(PATH)))))
	135
837a2e26 PM	136	# Logical functions (for operating on y/n values like CONFIG_FOO vars)
	137	# Inputs to these must be either "y" (true) or "n" or "" (both false)
	138	# Output is always either "y" or "n".
	139	# Usage: $(call land,$(CONFIG_FOO),$(CONFIG_BAR))
	140	# Logical NOT
	141	lnot = $(if $(subst n,,$1),n,y)
	142	# Logical AND
	143	land = $(if $(findstring yy,$1$2),y,n)
	144	# Logical OR
	145	lor = $(if $(findstring y,$1$2),y,n)
	146	# Logical XOR (note that this is the inverse of leqv)
	147	lxor = $(if $(filter $(call lnot,$1),$(call lnot,$2)),n,y)
	148	# Logical equivalence (note that leqv "","n" is true)
	149	leqv = $(if $(filter $(call lnot,$1),$(call lnot,$2)),y,n)
	150	# Logical if: like make's $(if) but with an leqv-like test
	151	lif = $(if $(subst n,,$1),$2,$3)
	152
9ef622e3 PM	153	# String testing functions: inputs to these can be any string;
	154	# the output is always either "y" or "n". Leading and trailing whitespace
	155	# is ignored when comparing strings.
	156	# String equality
	157	eq = $(if $(subst $2,,$1)$(subst $1,,$2),n,y)
	158	# String inequality
	159	ne = $(if $(subst $2,,$1)$(subst $1,,$2),y,n)
	160	# Emptiness/non-emptiness tests:
	161	isempty = $(if $1,n,y)
	162	notempty = $(if $1,y,n)
	163
c0424934 LV	164	# Generate files with tracetool
	165	TRACETOOL=$(PYTHON) $(SRC_PATH)/scripts/tracetool.py
	166
1215c6e7 JQ	167	# Generate timestamp files for .h include files
1215c6e7 JQ	168
4b25966a MT	169	config-%.h: config-%.h-timestamp
4b25966a MT	170	@cmp $< $@ >/dev/null 2>&1 \|\| cp $< $@
1215c6e7	171
55335015	172	config-%.h-timestamp: config-%.mak $(SRC_PATH)/scripts/create_config
4b25966a	173	$(call quiet-command, sh $(SRC_PATH)/scripts/create_config < $< > $@, " GEN $(TARGET_DIR)config-$*.h")
7dbbbb0c	174
7586317b MT	175	.PHONY: clean-timestamp
	176	clean-timestamp:
	177	rm -f *.timestamp
	178	clean: clean-timestamp
	179
7dbbbb0c MT	180	# will delete the target of a rule if commands exit with a nonzero exit status
7dbbbb0c MT	181	.DELETE_ON_ERROR:
e05804ee	182
1c33ac57 FZ	183	# save-vars
	184	# Usage: $(call save-vars, vars)
	185	# Save each variable $v in $vars as save-vars-$v, save their object's
	186	# variables, then clear $v.
	187	define save-vars
	188	$(foreach v,$1,
	189	$(eval save-vars-$v := $(value $v))
	190	$(foreach o,$($v),
	191	$(foreach k,cflags libs objs,
	192	$(if $($o-$k),
	193	$(eval save-vars-$o-$k := $($o-$k))
	194	$(eval $o-$k := ))))
	195	$(eval $v := ))
5c0d52bc FZ	196	endef
5c0d52bc FZ	197
1c33ac57 FZ	198	# load-vars
	199	# Usage: $(call load-vars, vars, add_var)
	200	# Load the saved value for each variable in @vars, and the per object
	201	# variables.
	202	# Append @add_var's current value to the loaded value.
	203	define load-vars
	204	$(eval $2-new-value := $(value $2))
	205	$(foreach v,$1,
	206	$(eval $v := $(value save-vars-$v))
	207	$(foreach o,$($v),
	208	$(foreach k,cflags libs objs,
	209	$(if $(save-vars-$o-$k),
	210	$(eval $o-$k := $(save-vars-$o-$k))
	211	$(eval save-vars-$o-$k := ))))
	212	$(eval save-vars-$v := ))
	213	$(eval $2 := $(value $2) $($2-new-value))
e05804ee PB	214	endef
e05804ee PB	215
1c33ac57 FZ	216	# fix-paths
	217	# Usage: $(call fix-paths, obj_path, src_path, vars)
	218	# Add prefix @obj_path to all objects in @vars, and add prefix @src_path to all
	219	# directories in @vars.
	220	define fix-paths
	221	$(foreach v,$3,
	222	$(foreach o,$($v),
	223	$(if $($o-libs),
	224	$(eval $1$o-libs := $($o-libs)))
	225	$(if $($o-cflags),
	226	$(eval $1$o-cflags := $($o-cflags)))
	227	$(if $($o-objs),
	228	$(eval $1$o-objs := $(addprefix $1,$($o-objs)))))
	229	$(eval $v := $(addprefix $1,$(filter-out %/,$($v))) \
	230	$(addprefix $2,$(filter %/,$($v)))))
e05804ee PB	231	endef
e05804ee PB	232
1c33ac57 FZ	233	# unnest-var-recursive
	234	# Usage: $(call unnest-var-recursive, obj_prefix, vars, var)
	235	#
	236	# Unnest @var by including subdir Makefile.objs, while protect others in @vars
	237	# unchanged.
	238	#
	239	# @obj_prefix is the starting point of object path prefix.
	240	#
	241	define unnest-var-recursive
	242	$(eval dirs := $(sort $(filter %/,$($3))))
	243	$(eval $3 := $(filter-out %/,$($3)))
	244	$(foreach d,$(dirs:%/=%),
	245	$(call save-vars,$2)
	246	$(eval obj := $(if $1,$1/)$d)
	247	$(eval -include $(SRC_PATH)/$d/Makefile.objs)
	248	$(call fix-paths,$(if $1,$1/)$d/,$d/,$2)
	249	$(call load-vars,$2,$3)
	250	$(call unnest-var-recursive,$1,$2,$3))
17969268 FZ	251	endef
17969268 FZ	252
1c33ac57 FZ	253	# unnest-vars
	254	# Usage: $(call unnest-vars, obj_prefix, vars)
	255	#
	256	# @obj_prefix: object path prefix, can be empty, or '..', etc. Don't include
	257	# ending '/'.
	258	#
	259	# @vars: the list of variable names to unnest.
	260	#
	261	# This macro will scan subdirectories's Makefile.objs, include them, to build
	262	# up each variable listed in @vars.
	263	#
	264	# Per object and per module cflags and libs are saved with relative path fixed
	265	# as well, those variables include -libs, -cflags and -objs. Items in -objs are
	266	# also fixed to relative path against SRC_PATH plus the prefix @obj_prefix.
	267	#
	268	# All nested variables postfixed by -m in names are treated as DSO variables,
	269	# and will be built as modules, if enabled.
	270	#
	271	# A simple example of the unnest:
	272	#
	273	# obj_prefix = ..
	274	# vars = hot cold
	275	# hot = fire.o sun.o season/
	276	# cold = snow.o water/ season/
	277	#
	278	# Unnest through a faked source directory structure:
	279	#
	280	# SRC_PATH
	281	# ├── water
	282	# │ └── Makefile.objs──────────────────┐
	283	# │ │ hot += steam.o │
	284	# │ │ cold += ice.mo │
	285	# │ │ ice.mo-libs := -licemaker │
	286	# │ │ ice.mo-objs := ice1.o ice2.o │
	287	# │ └──────────────────────────────┘
	288	# │
	289	# └── season
	290	# └── Makefile.objs──────┐
	291	# │ hot += summer.o │
	292	# │ cold += winter.o │
	293	# └──────────────────┘
	294	#
	295	# In the end, the result will be:
	296	#
	297	# hot = ../fire.o ../sun.o ../season/summer.o
	298	# cold = ../snow.o ../water/ice.mo ../season/winter.o
	299	# ../water/ice.mo-libs = -licemaker
	300	# ../water/ice.mo-objs = ../water/ice1.o ../water/ice2.o
	301	#
	302	# Note that 'hot' didn't include 'season/' in the input, so 'summer.o' is not
	303	# included.
	304	#
e05804ee	305	define unnest-vars
1c33ac57 FZ	306	# In the case of target build (i.e. $1 == ..), fix path for top level
	307	# Makefile.objs objects
	308	$(if $1,$(call fix-paths,$1/,,$2))
	309
	310	# Descend and include every subdir Makefile.objs
c88f68ec FZ	311	$(foreach v, $2,
	312	$(call unnest-var-recursive,$1,$2,$v)
	313	# Pass the .mo-cflags and .mo-libs along to its member objects
	314	$(foreach o, $(filter %.mo,$($v)),
	315	$(foreach p,$($o-objs),
	316	$(if $($o-cflags), $(eval $p-cflags += $($o-cflags)))
	317	$(if $($o-libs), $(eval $p-libs += $($o-libs))))))
	318
	319	# For all %.mo objects that are directly added into -y, just expand them
	320	$(foreach v,$(filter %-y,$2),
	321	$(eval $v := $(foreach o,$($v),$(if $($o-objs),$($o-objs),$o))))
1c33ac57 FZ	322
	323	$(foreach v,$(filter %-m,$2),
	324	# All .o found in *-m variables are single object modules, create .mo
	325	# for them
	326	$(foreach o,$(filter %.o,$($v)),
	327	$(eval $(o:%.o=%.mo)-objs := $o))
	328	# Now unify .o in -m variable to .mo
	329	$(eval $v := $($v:%.o=%.mo))
	330	$(eval modules-m += $($v))
	331
	332	# For module build, build shared libraries during "make modules"
	333	# For non-module build, add -m to -y
	334	$(if $(CONFIG_MODULES),
c261d774	335	$(foreach o,$($v),
d24697e1	336	$(eval $($o-objs): CFLAGS += $(DSO_OBJ_CFLAGS))
c261d774 FZ	337	$(eval $o: $($o-objs)))
c261d774 FZ	338	$(eval $(patsubst %-m,%-y,$v) += $($v))
1c33ac57 FZ	339	$(eval modules: $($v:%.mo=%$(DSOSUF))),
	340	$(eval $(patsubst %-m,%-y,$v) += $(call expand-objs, $($v)))))
	341
	342	# Post-process all the unnested vars
	343	$(foreach v,$2,
	344	$(foreach o, $(filter %.mo,$($v)),
	345	# Find all the .mo objects in variables and add dependency rules
	346	# according to .mo-objs. Report error if not set
	347	$(if $($o-objs),
	348	$(eval $(o:%.mo=%$(DSOSUF)): module-common.o $($o-objs)),
c88f68ec	349	$(error $o added in $v but $o-objs is not set)))
1c33ac57 FZ	350	$(shell mkdir -p ./ $(sort $(dir $($v))))
1c33ac57 FZ	351	# Include all the .d files
27fa7479	352	$(eval -include $(patsubst %.o,%.d,$(patsubst %.mo,%.d,$($v))))
1c33ac57	353	$(eval $v := $(filter-out %/,$($v))))
e05804ee	354	endef