# These are used when we want to do substitutions without confusing Make NULL := SPACE := $(NULL) # 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 %/trace-events: %.hx: %.py: %.objs: %.d: %.h: %.c: %.cc: %.cpp: %.m: %.mak: clean-target: # Flags for dependency generation QEMU_DGFLAGS += -MMD -MP -MT $@ -MF $(@D)/$(*F).d # Compiler searches the source file dir first, but in vpath builds # we need to make it search the build dir too, before any other # explicit search paths. There are two search locations in the build # dir, one absolute and the other relative to the compiler working # directory. These are the same for target-independent files, but # different for target-dependent ones. QEMU_LOCAL_INCLUDES = -iquote $(BUILD_DIR)/$(@D) -iquote $(@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 $(foreach o,$(filter-out %.mo,$1),$($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_LOCAL_INCLUDES) $(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) $(CFLAGS) $(QEMU_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_LOCAL_INCLUDES) $(QEMU_INCLUDES) \ $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) \ -c -o $@ $<,"CCAS","$(TARGET_DIR)$@") %.o: %.cc $(call quiet-command,$(CXX) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \ $(QEMU_CXXFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) \ -c -o $@ $<,"CXX","$(TARGET_DIR)$@") %.o: %.cpp $(call quiet-command,$(CXX) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \ $(QEMU_CXXFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) \ -c -o $@ $<,"CXX","$(TARGET_DIR)$@") %.o: %.m $(call quiet-command,$(OBJCC) $(QEMU_LOCAL_INCLUDES) $(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): QEMU_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 $(LD_REL_FLAGS) %.mo: $(call quiet-command,$(LD_REL) -o $@ $^,"LD","$(TARGET_DIR)$@") .PHONY: modules modules: %$(EXESUF): %.o $(call LINK,$(filter %.o %.a %.mo, $^)) %.a: $(call quiet-command,rm -f $@ && $(AR) rcs $@ $^,"AR","$(TARGET_DIR)$@") # Usage: $(call quiet-command,command and args,"NAME","args to print") # This will run "command and args", and either: # if V=1 just print the whole command and args # otherwise print the 'quiet' output in the format " NAME args to print" # NAME should be a short name of the command, 7 letters or fewer. # If called with only a single argument, will print nothing in quiet mode. quiet-command-run = $(if $(V),,$(if $2,printf " %-7s %s\n" $2 $3 && ))$1 quiet-@ = $(if $(V),,@) quiet-command = $(quiet-@)$(call quiet-command-run,$1,$2,$3) # cc-option # Usage: CFLAGS+=$(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) cc-c-option = $(if $(shell $(CC) $1 $2 -c -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 Kconfig% %.json.in 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 $(findstring /, $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 $v. saved-vars-$v contains the variables that # where saved for the objects, in order to speedup load-vars. define save-vars $(foreach v,$1, $(eval save-vars-$v := $(value $v)) $(eval saved-vars-$v := $(foreach o,$($v), \ $(if $($o-cflags), $o-cflags $(eval save-vars-$o-cflags := $($o-cflags))$(eval $o-cflags := )) \ $(if $($o-libs), $o-libs $(eval save-vars-$o-libs := $($o-libs))$(eval $o-libs := )) \ $(if $($o-objs), $o-objs $(eval save-vars-$o-objs := $($o-objs))$(eval $o-objs := )))) $(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)) $(foreach o,$(saved-vars-$v), $(eval $o := $(save-vars-$o)) $(eval save-vars-$o := )) $(eval save-vars-$v := ) $(eval saved-vars-$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 'water/' in the input, so 'steam.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 TEXI2MAN = $(call quiet-command, \ perl -Ww -- $(SRC_PATH)/scripts/texi2pod.pl $(TEXI2PODFLAGS) $< $@.pod && \ $(POD2MAN) --section=$(subst .,,$(suffix $@)) --center=" " --release=" " $@.pod > $@, \ "GEN","$@") %.1: $(call TEXI2MAN) %.7: $(call TEXI2MAN) %.8: $(call TEXI2MAN) GEN_SUBST = $(call quiet-command, \ sed -e "s!@libexecdir@!$(libexecdir)!g" < $< > $@, \ "GEN","$@") %.json: %.json.in $(call GEN_SUBST) # Support for building multiple output files by atomically executing # a single rule which depends on several input files (so the rule # will be executed exactly once, not once per output file, and # not multiple times in parallel.) For more explanation see: # https://www.cmcrossroads.com/article/atomic-rules-gnu-make # Given a space-separated list of filenames, create the name of # a 'sentinel' file to use to indicate that they have been built. # We use fixed text on the end to avoid accidentally triggering # automatic pattern rules, and . on the start to make the file # not show up in ls output. sentinel = .$(subst $(SPACE),_,$(subst /,_,$1)).sentinel. # Define an atomic rule that builds multiple outputs from multiple inputs. # To use: # $(call atomic,out1 out2 ...,in1 in2 ...) # <TAB>rule to do the operation # # Make 4.3 will have native support for this, and you would be able # to instead write: # out1 out2 ... &: in1 in2 ... # <TAB>rule to do the operation # # The way this works is that it creates a make rule # "out1 out2 ... : sentinel-file ; @:" which says that the sentinel # depends on the dependencies, and the rule to do that is "do nothing". # Then we have a rule # "sentinel-file : in1 in2 ..." # whose commands start with "touch sentinel-file" and then continue # with the rule text provided by the user of this 'atomic' function. # The foreach... is there to delete the sentinel file if any of the # output files don't exist, so that we correctly rebuild in that situation. atomic = $(eval $1: $(call sentinel,$1) ; @:) \ $(call sentinel,$1) : $2 ; @touch $$@ \ $(foreach t,$1,$(if $(wildcard $t),,$(shell rm -f $(call sentinel,$1)))) print-%: @echo '$*=$($*)'