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
) -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}')
44 whole-archive
= $(WL
)-force_load
,$1
46 whole-archive
= $(WL
)--whole-archive
$1 $(WL
)--no-whole-archive
49 # All the .mo objects in -m variables are also added into corresponding -y
50 # variable in unnest-vars, but filtered out here, when LINK is called.
52 # The .mo objects are supposed to be linked as a DSO, for module build. So here
53 # they are only used as a placeholders to generate those "archive undefined"
54 # symbol options (-Wl,-u,$symbol_name), which are the archive functions
55 # referenced by the code in the DSO.
57 # Also the presence in -y variables will also guarantee they are built before
58 # linking executables that will load them. So we can look up symbol reference
61 # This is necessary because the exectuable itself may not use the function, in
62 # which case the function would not be linked in. Then the DSO loading will
63 # fail because of the missing symbol.
64 process-archive-undefs
= $(filter-out %.a
%.fa
%.mo
,$1) \
65 $(addprefix $(WL_U
), \
66 $(filter $(call defined-symbols
,$(filter %.a
%.fa
, $1)), \
67 $(call undefined-symbols
,$(filter %.mo
,$1)))) \
68 $(foreach l
,$(filter %.fa
,$1),$(call whole-archive
,$l)) \
71 extract-libs
= $(strip $(foreach o
,$(filter-out %.mo
,$1),$($o-libs
)))
72 expand-objs
= $(strip $(sort $(filter %.o
,$1)) \
73 $(foreach o
,$(filter %.mo
,$1),$($o-objs
)) \
74 $(filter-out %.o
%.mo
,$1))
78 $(call quiet-command
,$(CC
) $(QEMU_LOCAL_INCLUDES
) $(QEMU_INCLUDES
) \
79 $(QEMU_CFLAGS
) $(QEMU_DGFLAGS
) $(CFLAGS
) $($@
-cflags) \
80 -c
-o
$@
$<,"CC","$(TARGET_DIR)$@")
82 $(call quiet-command
,$(WINDRES
) -I.
-o
$@
$<,"RC","$(TARGET_DIR)$@")
84 # If we have a CXX we might have some C++ objects, in which case we
85 # must link with the C++ compiler, not the plain C compiler.
86 LINKPROG
= $(or
$(CXX
),$(CC
))
88 LINK
= $(call quiet-command
, $(LINKPROG
) $(CFLAGS
) $(QEMU_LDFLAGS
) -o
$@ \
89 $(call process-archive-undefs
, $1) \
90 $(version-obj-y
) $(call extract-libs
,$1) $(LIBS
),"LINK","$(TARGET_DIR)$@")
93 $(call quiet-command
,$(CCAS
) $(QEMU_LOCAL_INCLUDES
) $(QEMU_INCLUDES
) \
94 $(QEMU_CFLAGS
) $(QEMU_DGFLAGS
) $(CFLAGS
) \
95 -c
-o
$@
$<,"CCAS","$(TARGET_DIR)$@")
98 $(call quiet-command
,$(CXX
) $(QEMU_LOCAL_INCLUDES
) $(QEMU_INCLUDES
) \
99 $(QEMU_CXXFLAGS
) $(QEMU_DGFLAGS
) $(CXXFLAGS
) $($@
-cflags) \
100 -c
-o
$@
$<,"CXX","$(TARGET_DIR)$@")
103 $(call quiet-command
,$(CXX
) $(QEMU_LOCAL_INCLUDES
) $(QEMU_INCLUDES
) \
104 $(QEMU_CXXFLAGS
) $(QEMU_DGFLAGS
) $(CXXFLAGS
) $($@
-cflags) \
105 -c
-o
$@
$<,"CXX","$(TARGET_DIR)$@")
108 $(call quiet-command
,$(OBJCC
) $(QEMU_LOCAL_INCLUDES
) $(QEMU_INCLUDES
) \
109 $(QEMU_CFLAGS
) $(QEMU_DGFLAGS
) $(CFLAGS
) $($@
-cflags) \
110 -c
-o
$@
$<,"OBJC","$(TARGET_DIR)$@")
113 $(call quiet-command
,dtrace
-o
$@
-G
-s
$<,"GEN","$(TARGET_DIR)$@")
115 DSO_OBJ_CFLAGS
:= -fPIC
-DBUILD_DSO
116 module-common.o
: CFLAGS
+= $(DSO_OBJ_CFLAGS
)
117 %$(DSOSUF
): QEMU_LDFLAGS
+= $(LDFLAGS_SHARED
)
120 @
# Copy to build root so modules can be loaded when program started without install
121 $(if
$(findstring /,$@
),$(call quiet-command
,cp
$@
$(subst /,-,$@
),"CP","$(subst /,-,$@)"))
124 LD_REL
:= $(CC
) -nostdlib
$(LD_REL_FLAGS
)
127 $(call quiet-command
,$(LD_REL
) -o
$@
$^
,"LD","$(TARGET_DIR)$@")
133 $(call LINK
,$(filter %.o
%.a
%.mo
%.fa
, $^
))
136 $(call quiet-command
,rm -f
$@
&& $(AR
) rcs
$@
$^
,"AR","$(TARGET_DIR)$@")
138 # Usage: $(call quiet-command,command and args,"NAME","args to print")
139 # This will run "command and args", and either:
140 # if V=1 just print the whole command and args
141 # otherwise print the 'quiet' output in the format " NAME args to print"
142 # NAME should be a short name of the command, 7 letters or fewer.
143 # If called with only a single argument, will print nothing in quiet mode.
144 quiet-command-run
= $(if
$(V
),,$(if
$2,printf
" %-7s %s\n" $2 $3 && ))$1
145 quiet-@
= $(if
$(V
),,@
)
146 quiet-command
= $(quiet-@
)$(call quiet-command-run
,$1,$2,$3)
149 # Usage: CFLAGS+=$(call cc-option, -falign-functions=0, -malign-functions=0)
151 cc-option
= $(if
$(shell $(CC
) $1 $2 -S
-o
/dev
/null
-xc
/dev
/null \
152 >/dev
/null
2>&1 && echo OK
), $2, $3)
153 cc-c-option
= $(if
$(shell $(CC
) $1 $2 -c
-o
/dev
/null
-xc
/dev
/null \
154 >/dev
/null
2>&1 && echo OK
), $2, $3)
156 VPATH_SUFFIXES
= %.c
%.h
%.S
%.
cc %.
cpp %.m
%.mak
%.texi
%.sh
%.rc Kconfig
% %.json.in
157 set-vpath
= $(if
$1,$(foreach PATTERN
,$(VPATH_SUFFIXES
),$(eval vpath
$(PATTERN
) $1)))
159 # install-prog list, dir
162 $(INSTALL_PROG
) $1 "$2"
163 $(if
$(STRIP
),$(STRIP
) $(foreach T
,$1,"$2/$(notdir $T)"),)
167 # Usage: $(call find-in-path, prog)
168 # Looks in the PATH if the argument contains no slash, else only considers one
169 # specific directory. Returns an # empty string if the program doesn't exist
171 find-in-path
= $(if
$(findstring /, $1), \
173 $(wildcard $(patsubst %, %/$1, $(subst :, ,$(PATH
)))))
175 # Logical functions (for operating on y/n values like CONFIG_FOO vars)
176 # Inputs to these must be either "y" (true) or "n" or "" (both false)
177 # Output is always either "y" or "n".
178 # Usage: $(call land,$(CONFIG_FOO),$(CONFIG_BAR))
180 lnot
= $(if
$(subst n
,,$1),n
,y
)
182 land
= $(if
$(findstring yy
,$1$2),y
,n
)
184 lor
= $(if
$(findstring y
,$1$2),y
,n
)
185 # Logical XOR (note that this is the inverse of leqv)
186 lxor
= $(if
$(filter $(call lnot
,$1),$(call lnot
,$2)),n
,y
)
187 # Logical equivalence (note that leqv "","n" is true)
188 leqv
= $(if
$(filter $(call lnot
,$1),$(call lnot
,$2)),y
,n
)
189 # Logical if: like make's $(if) but with an leqv-like test
190 lif
= $(if
$(subst n
,,$1),$2,$3)
192 # String testing functions: inputs to these can be any string;
193 # the output is always either "y" or "n". Leading and trailing whitespace
194 # is ignored when comparing strings.
196 eq
= $(if
$(subst $2,,$1)$(subst $1,,$2),n
,y
)
198 ne
= $(if
$(subst $2,,$1)$(subst $1,,$2),y
,n
)
199 # Emptiness/non-emptiness tests:
200 isempty
= $(if
$1,n
,y
)
201 notempty
= $(if
$1,y
,n
)
203 # Generate files with tracetool
204 TRACETOOL
=$(PYTHON
) $(SRC_PATH
)/scripts
/tracetool.py
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
,$(filter %.o
,$($v)))))
382 $(eval
$v := $(filter-out %/,$($v))))
385 TEXI2MAN
= $(call quiet-command
, \
386 perl
-Ww
-- $(SRC_PATH
)/scripts
/texi2pod.pl
$(TEXI2PODFLAGS
) $< $@.pod
&& \
387 $(POD2MAN
) --section
=$(subst .
,,$(suffix $@
)) --center
=" " --release
=" " $@.pod
> $@
, \
397 # Support for building multiple output files by atomically executing
398 # a single rule which depends on several input files (so the rule
399 # will be executed exactly once, not once per output file, and
400 # not multiple times in parallel.) For more explanation see:
401 # https://www.cmcrossroads.com/article/atomic-rules-gnu-make
403 # Given a space-separated list of filenames, create the name of
404 # a 'sentinel' file to use to indicate that they have been built.
405 # We use fixed text on the end to avoid accidentally triggering
406 # automatic pattern rules, and . on the start to make the file
407 # not show up in ls output.
408 sentinel
= .
$(subst $(SPACE
),_
,$(subst /,_
,$1)).sentinel.
410 # Define an atomic rule that builds multiple outputs from multiple inputs.
412 # $(call atomic,out1 out2 ...,in1 in2 ...)
413 # <TAB>rule to do the operation
415 # Make 4.3 will have native support for this, and you would be able
417 # out1 out2 ... &: in1 in2 ...
418 # <TAB>rule to do the operation
420 # The way this works is that it creates a make rule
421 # "out1 out2 ... : sentinel-file ; @:" which says that the sentinel
422 # depends on the dependencies, and the rule to do that is "do nothing".
423 # Then we have a rule
424 # "sentinel-file : in1 in2 ..."
425 # whose commands start with "touch sentinel-file" and then continue
426 # with the rule text provided by the user of this 'atomic' function.
427 # The foreach... is there to delete the sentinel file if any of the
428 # output files don't exist, so that we correctly rebuild in that situation.
429 atomic
= $(eval
$1: $(call sentinel
,$1) ; @
:) \
430 $(call sentinel
,$1) : $2 ; @touch
$$@ \
431 $(foreach t
,$1,$(if
$(wildcard $t),,$(shell rm -f
$(call sentinel
,$1))))