2 # These are used when we want to do substitutions without confusing Make
7 # Don't use implicit rules or variables
8 # we have explicit rules for everything
11 # Files with this suffixes are final, don't try to generate them
12 # using implicit rules
26 # Flags for dependency generation
27 QEMU_DGFLAGS += -MMD -MP -MT $@ -MF $(@D)/$(*F).d
29 # Compiler searches the source file dir first, but in vpath builds
30 # we need to make it search the build dir too, before any other
31 # explicit search paths. There are two search locations in the build
32 # dir, one absolute and the other relative to the compiler working
33 # directory. These are the same for target-independent files, but
34 # different for target-dependent ones.
35 QEMU_LOCAL_INCLUDES = -iquote $(BUILD_DIR)/$(@D) -iquote $(@D)
38 find-symbols = $(if $1, $(sort $(shell $(NM) -P -g $1 | $2)))
39 defined-symbols = $(call find-symbols,$1,awk '$$2!="U"{print $$1}')
40 undefined-symbols = $(call find-symbols,$1,awk '$$2=="U"{print $$1}')
42 # All the .mo objects in -m variables are also added into corresponding -y
43 # variable in unnest-vars, but filtered out here, when LINK is called.
45 # The .mo objects are supposed to be linked as a DSO, for module build. So here
46 # they are only used as a placeholders to generate those "archive undefined"
47 # symbol options (-Wl,-u,$symbol_name), which are the archive functions
48 # referenced by the code in the DSO.
50 # Also the presence in -y variables will also guarantee they are built before
51 # linking executables that will load them. So we can look up symbol reference
54 # This is necessary because the exectuable itself may not use the function, in
55 # which case the function would not be linked in. Then the DSO loading will
56 # fail because of the missing symbol.
57 process-archive-undefs = $(filter-out %.a %.mo,$1) \
58 $(addprefix $(WL_U), \
59 $(filter $(call defined-symbols,$(filter %.a, $1)), \
60 $(call undefined-symbols,$(filter %.mo,$1)))) \
63 extract-libs = $(strip $(foreach o,$(filter-out %.mo,$1),$($o-libs)))
64 expand-objs = $(strip $(sort $(filter %.o,$1)) \
65 $(foreach o,$(filter %.mo,$1),$($o-objs)) \
66 $(filter-out %.o %.mo,$1))
70 $(call quiet-command,$(CC) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \
71 $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) \
72 -c -o $@ $<,"CC","$(TARGET_DIR)$@")
74 $(call quiet-command,$(WINDRES) -I. -o $@ $<,"RC","$(TARGET_DIR)$@")
76 # If we have a CXX we might have some C++ objects, in which case we
77 # must link with the C++ compiler, not the plain C compiler.
78 LINKPROG = $(or $(CXX),$(CC))
80 LINK = $(call quiet-command, $(LINKPROG) $(CFLAGS) $(QEMU_LDFLAGS) -o $@ \
81 $(call process-archive-undefs, $1) \
82 $(version-obj-y) $(call extract-libs,$1) $(LIBS),"LINK","$(TARGET_DIR)$@")
85 $(call quiet-command,$(CCAS) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \
86 $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) \
87 -c -o $@ $<,"CCAS","$(TARGET_DIR)$@")
90 $(call quiet-command,$(CXX) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \
91 $(QEMU_CXXFLAGS) $(QEMU_DGFLAGS) $(CXXFLAGS) $($@-cflags) \
92 -c -o $@ $<,"CXX","$(TARGET_DIR)$@")
95 $(call quiet-command,$(CXX) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \
96 $(QEMU_CXXFLAGS) $(QEMU_DGFLAGS) $(CXXFLAGS) $($@-cflags) \
97 -c -o $@ $<,"CXX","$(TARGET_DIR)$@")
100 $(call quiet-command,$(OBJCC) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \
101 $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) \
102 -c -o $@ $<,"OBJC","$(TARGET_DIR)$@")
105 $(call quiet-command,dtrace -o $@ -G -s $<,"GEN","$(TARGET_DIR)$@")
107 DSO_OBJ_CFLAGS := -fPIC -DBUILD_DSO
108 module-common.o: CFLAGS += $(DSO_OBJ_CFLAGS)
109 %$(DSOSUF): QEMU_LDFLAGS += $(LDFLAGS_SHARED)
112 @# Copy to build root so modules can be loaded when program started without install
113 $(if $(findstring /,$@),$(call quiet-command,cp $@ $(subst /,-,$@),"CP","$(subst /,-,$@)"))
116 LD_REL := $(CC) -nostdlib $(LD_REL_FLAGS)
119 $(call quiet-command,$(LD_REL) -o $@ $^,"LD","$(TARGET_DIR)$@")
125 $(call LINK,$(filter %.o %.a %.mo, $^))
128 $(call quiet-command,rm -f $@ && $(AR) rcs $@ $^,"AR","$(TARGET_DIR)$@")
130 # Usage: $(call quiet-command,command and args,"NAME","args to print")
131 # This will run "command and args", and either:
132 # if V=1 just print the whole command and args
133 # otherwise print the 'quiet' output in the format " NAME args to print"
134 # NAME should be a short name of the command, 7 letters or fewer.
135 # If called with only a single argument, will print nothing in quiet mode.
136 quiet-command-run = $(if $(V),,$(if $2,printf " %-7s %s\n" $2 $3 && ))$1
137 quiet-@ = $(if $(V),,@)
138 quiet-command = $(quiet-@)$(call quiet-command-run,$1,$2,$3)
141 # Usage: CFLAGS+=$(call cc-option, -falign-functions=0, -malign-functions=0)
143 cc-option = $(if $(shell $(CC) $1 $2 -S -o /dev/null -xc /dev/null \
144 >/dev/null 2>&1 && echo OK), $2, $3)
145 cc-c-option = $(if $(shell $(CC) $1 $2 -c -o /dev/null -xc /dev/null \
146 >/dev/null 2>&1 && echo OK), $2, $3)
148 VPATH_SUFFIXES = %.c %.h %.S %.cc %.cpp %.m %.mak %.texi %.sh %.rc Kconfig% %.json.in
149 set-vpath = $(if $1,$(foreach PATTERN,$(VPATH_SUFFIXES),$(eval vpath $(PATTERN) $1)))
151 # install-prog list, dir
154 $(INSTALL_PROG) $1 "$2"
155 $(if $(STRIP),$(STRIP) $(foreach T,$1,"$2/$(notdir $T)"),)
159 # Usage: $(call find-in-path, prog)
160 # Looks in the PATH if the argument contains no slash, else only considers one
161 # specific directory. Returns an # empty string if the program doesn't exist
163 find-in-path = $(if $(findstring /, $1), \
165 $(wildcard $(patsubst %, %/$1, $(subst :, ,$(PATH)))))
167 # Logical functions (for operating on y/n values like CONFIG_FOO vars)
168 # Inputs to these must be either "y" (true) or "n" or "" (both false)
169 # Output is always either "y" or "n".
170 # Usage: $(call land,$(CONFIG_FOO),$(CONFIG_BAR))
172 lnot = $(if $(subst n,,$1),n,y)
174 land = $(if $(findstring yy,$1$2),y,n)
176 lor = $(if $(findstring y,$1$2),y,n)
177 # Logical XOR (note that this is the inverse of leqv)
178 lxor = $(if $(filter $(call lnot,$1),$(call lnot,$2)),n,y)
179 # Logical equivalence (note that leqv "","n" is true)
180 leqv = $(if $(filter $(call lnot,$1),$(call lnot,$2)),y,n)
181 # Logical if: like make's $(if) but with an leqv-like test
182 lif = $(if $(subst n,,$1),$2,$3)
184 # String testing functions: inputs to these can be any string;
185 # the output is always either "y" or "n". Leading and trailing whitespace
186 # is ignored when comparing strings.
188 eq = $(if $(subst $2,,$1)$(subst $1,,$2),n,y)
190 ne = $(if $(subst $2,,$1)$(subst $1,,$2),y,n)
191 # Emptiness/non-emptiness tests:
192 isempty = $(if $1,n,y)
193 notempty = $(if $1,y,n)
195 # Generate files with tracetool
196 TRACETOOL=$(PYTHON) $(SRC_PATH)/scripts/tracetool.py
198 # Generate timestamp files for .h include files
200 config-%.h: config-%.h-timestamp
201 @cmp $< $@ >/dev/null 2>&1 || cp $< $@
203 config-%.h-timestamp: config-%.mak $(SRC_PATH)/scripts/create_config
204 $(call quiet-command, sh $(SRC_PATH)/scripts/create_config < $< > $@,"GEN","$(TARGET_DIR)config-$*.h")
206 .PHONY: clean-timestamp
209 clean: clean-timestamp
211 # will delete the target of a rule if commands exit with a nonzero exit status
215 # Usage: $(call save-vars, vars)
216 # Save each variable $v in $vars as save-vars-$v, save their object's
217 # variables, then clear $v. saved-vars-$v contains the variables that
218 # where saved for the objects, in order to speedup load-vars.
221 $(eval save-vars-$v := $(value $v))
222 $(eval saved-vars-$v := $(foreach o,$($v), \
223 $(if $($o-cflags), $o-cflags $(eval save-vars-$o-cflags := $($o-cflags))$(eval $o-cflags := )) \
224 $(if $($o-libs), $o-libs $(eval save-vars-$o-libs := $($o-libs))$(eval $o-libs := )) \
225 $(if $($o-objs), $o-objs $(eval save-vars-$o-objs := $($o-objs))$(eval $o-objs := ))))
230 # Usage: $(call load-vars, vars, add_var)
231 # Load the saved value for each variable in @vars, and the per object
233 # Append @add_var's current value to the loaded value.
235 $(eval $2-new-value := $(value $2))
237 $(eval $v := $(value save-vars-$v))
238 $(foreach o,$(saved-vars-$v),
239 $(eval $o := $(save-vars-$o)) $(eval save-vars-$o := ))
240 $(eval save-vars-$v := )
241 $(eval saved-vars-$v := ))
242 $(eval $2 := $(value $2) $($2-new-value))
246 # Usage: $(call fix-paths, obj_path, src_path, vars)
247 # Add prefix @obj_path to all objects in @vars, and add prefix @src_path to all
248 # directories in @vars.
253 $(eval $1$o-libs := $($o-libs)))
255 $(eval $1$o-cflags := $($o-cflags)))
257 $(eval $1$o-objs := $(addprefix $1,$($o-objs)))))
258 $(eval $v := $(addprefix $1,$(filter-out %/,$($v))) \
259 $(addprefix $2,$(filter %/,$($v)))))
262 # unnest-var-recursive
263 # Usage: $(call unnest-var-recursive, obj_prefix, vars, var)
265 # Unnest @var by including subdir Makefile.objs, while protect others in @vars
268 # @obj_prefix is the starting point of object path prefix.
270 define unnest-var-recursive
271 $(eval dirs := $(sort $(filter %/,$($3))))
272 $(eval $3 := $(filter-out %/,$($3)))
273 $(foreach d,$(dirs:%/=%),
275 $(eval obj := $(if $1,$1/)$d)
276 $(eval -include $(SRC_PATH)/$d/Makefile.objs)
277 $(call fix-paths,$(if $1,$1/)$d/,$d/,$2)
278 $(call load-vars,$2,$3)
279 $(call unnest-var-recursive,$1,$2,$3))
283 # Usage: $(call unnest-vars, obj_prefix, vars)
285 # @obj_prefix: object path prefix, can be empty, or '..', etc. Don't include
288 # @vars: the list of variable names to unnest.
290 # This macro will scan subdirectories's Makefile.objs, include them, to build
291 # up each variable listed in @vars.
293 # Per object and per module cflags and libs are saved with relative path fixed
294 # as well, those variables include -libs, -cflags and -objs. Items in -objs are
295 # also fixed to relative path against SRC_PATH plus the prefix @obj_prefix.
297 # All nested variables postfixed by -m in names are treated as DSO variables,
298 # and will be built as modules, if enabled.
300 # A simple example of the unnest:
304 # hot = fire.o sun.o season/
305 # cold = snow.o water/ season/
307 # Unnest through a faked source directory structure:
311 # │ └── Makefile.objs──────────────────┐
312 # │ │ hot += steam.o │
313 # │ │ cold += ice.mo │
314 # │ │ ice.mo-libs := -licemaker │
315 # │ │ ice.mo-objs := ice1.o ice2.o │
316 # │ └──────────────────────────────┘
319 # └── Makefile.objs──────┐
320 # │ hot += summer.o │
321 # │ cold += winter.o │
322 # └──────────────────┘
324 # In the end, the result will be:
326 # hot = ../fire.o ../sun.o ../season/summer.o
327 # cold = ../snow.o ../water/ice.mo ../season/winter.o
328 # ../water/ice.mo-libs = -licemaker
329 # ../water/ice.mo-objs = ../water/ice1.o ../water/ice2.o
331 # Note that 'hot' didn't include 'water/' in the input, so 'steam.o' is not
335 # In the case of target build (i.e. $1 == ..), fix path for top level
336 # Makefile.objs objects
337 $(if $1,$(call fix-paths,$1/,,$2))
339 # Descend and include every subdir Makefile.objs
341 $(call unnest-var-recursive,$1,$2,$v)
342 # Pass the .mo-cflags and .mo-libs along to its member objects
343 $(foreach o, $(filter %.mo,$($v)),
344 $(foreach p,$($o-objs),
345 $(if $($o-cflags), $(eval $p-cflags += $($o-cflags)))
346 $(if $($o-libs), $(eval $p-libs += $($o-libs))))))
348 # For all %.mo objects that are directly added into -y, just expand them
349 $(foreach v,$(filter %-y,$2),
350 $(eval $v := $(foreach o,$($v),$(if $($o-objs),$($o-objs),$o))))
352 $(foreach v,$(filter %-m,$2),
353 # All .o found in *-m variables are single object modules, create .mo
355 $(foreach o,$(filter %.o,$($v)),
356 $(eval $(o:%.o=%.mo)-objs := $o))
357 # Now unify .o in -m variable to .mo
358 $(eval $v := $($v:%.o=%.mo))
359 $(eval modules-m += $($v))
361 # For module build, build shared libraries during "make modules"
362 # For non-module build, add -m to -y
363 $(if $(CONFIG_MODULES),
365 $(eval $($o-objs): CFLAGS += $(DSO_OBJ_CFLAGS))
366 $(eval $o: $($o-objs)))
367 $(eval $(patsubst %-m,%-y,$v) += $($v))
368 $(eval modules: $($v:%.mo=%$(DSOSUF))),
369 $(eval $(patsubst %-m,%-y,$v) += $(call expand-objs, $($v)))))
371 # Post-process all the unnested vars
373 $(foreach o, $(filter %.mo,$($v)),
374 # Find all the .mo objects in variables and add dependency rules
375 # according to .mo-objs. Report error if not set
377 $(eval $(o:%.mo=%$(DSOSUF)): module-common.o $($o-objs)),
378 $(error $o added in $v but $o-objs is not set)))
379 $(shell mkdir -p ./ $(sort $(dir $($v))))
380 # Include all the .d files
381 $(eval -include $(patsubst %.o,%.d,$(patsubst %.mo,%.d,$($v))))
382 $(eval $v := $(filter-out %/,$($v))))
385 TEXI2MAN = $(call quiet-command, \
387 $(POD2MAN) --section=$(subst .,,$(suffix $@)) --center=" " --release=" "
[email protected] > $@, \
397 GEN_SUBST = $(call quiet-command, \
398 sed -e "s!@libexecdir@!$(libexecdir)!g" < $< > $@, \
404 # Support for building multiple output files by atomically executing
405 # a single rule which depends on several input files (so the rule
406 # will be executed exactly once, not once per output file, and
407 # not multiple times in parallel.) For more explanation see:
408 # https://www.cmcrossroads.com/article/atomic-rules-gnu-make
410 # Given a space-separated list of filenames, create the name of
411 # a 'sentinel' file to use to indicate that they have been built.
412 # We use fixed text on the end to avoid accidentally triggering
413 # automatic pattern rules, and . on the start to make the file
414 # not show up in ls output.
415 sentinel = .$(subst $(SPACE),_,$(subst /,_,$1)).sentinel.
417 # Define an atomic rule that builds multiple outputs from multiple inputs.
419 # $(call atomic,out1 out2 ...,in1 in2 ...)
420 # <TAB>rule to do the operation
422 # Make 4.3 will have native support for this, and you would be able
424 # out1 out2 ... &: in1 in2 ...
425 # <TAB>rule to do the operation
427 # The way this works is that it creates a make rule
428 # "out1 out2 ... : sentinel-file ; @:" which says that the sentinel
429 # depends on the dependencies, and the rule to do that is "do nothing".
430 # Then we have a rule
431 # "sentinel-file : in1 in2 ..."
432 # whose commands start with "touch sentinel-file" and then continue
433 # with the rule text provided by the user of this 'atomic' function.
434 # The foreach... is there to delete the sentinel file if any of the
435 # output files don't exist, so that we correctly rebuild in that situation.
436 atomic = $(eval $1: $(call sentinel,$1) ; @:) \
437 $(call sentinel,$1) : $2 ; @touch $$@ \
438 $(foreach t,$1,$(if $(wildcard $t),,$(shell rm -f $(call sentinel,$1))))