rules.mak

   1
   2 # These are used when we want to do substitutions without confusing Make
   3 NULL  :=
   4 SPACE := $(NULL) #
   5 COMMA := ,
   6
   7 # Don't use implicit rules or variables
   8 # we have explicit rules for everything
   9 MAKEFLAGS += -rR
  10
  11 # Files with this suffixes are final, don't try to generate them
  12 # using implicit rules
  13 %/trace-events:
  14 %.hx:
  15 %.py:
  16 %.objs:
  17 %.d:
  18 %.h:
  19 %.c:
  20 %.cc:
  21 %.cpp:
  22 %.m:
  23 %.mak:
  24
  25 # Flags for dependency generation
  26 QEMU_DGFLAGS += -MMD -MP -MT $@ -MF $(@D)/$(*F).d
  27
  28 # Compiler searches the source file dir first, but in vpath builds
  29 # we need to make it search the build dir too, before any other
  30 # explicit search paths. There are two search locations in the build
  31 # dir, one absolute and the other relative to the compiler working
  32 # directory. These are the same for target-independent files, but
  33 # different for target-dependent ones.
  34 QEMU_LOCAL_INCLUDES = -iquote $(BUILD_DIR) -iquote $(BUILD_DIR)/$(@D) -iquote $(@D)
  35
  36 WL_U := -Wl,-u,
  37 find-symbols = $(if $1, $(sort $(shell $(NM) -P -g $1 | $2)))
  38 defined-symbols = $(call find-symbols,$1,awk '$$2!="U"{print $$1}')
  39 undefined-symbols = $(call find-symbols,$1,awk '$$2=="U"{print $$1}')
  40
  41 WL := -Wl,
  42 ifdef CONFIG_DARWIN
  43 whole-archive = $(WL)-force_load,$1
  44 else
  45 whole-archive = $(WL)--whole-archive $1 $(WL)--no-whole-archive
  46 endif
  47
  48 # All the .mo objects in -m variables are also added into corresponding -y
  49 # variable in unnest-vars, but filtered out here, when LINK is called.
  50 #
  51 # The .mo objects are supposed to be linked as a DSO, for module build. So here
  52 # they are only used as a placeholders to generate those "archive undefined"
  53 # symbol options (-Wl,-u,$symbol_name), which are the archive functions
  54 # referenced by the code in the DSO.
  55 #
  56 # Also the presence in -y variables will also guarantee they are built before
  57 # linking executables that will load them. So we can look up symbol reference
  58 # in LINK.
  59 #
  60 # This is necessary because the exectuable itself may not use the function, in
  61 # which case the function would not be linked in. Then the DSO loading will
  62 # fail because of the missing symbol.
  63 process-archive-undefs = $(filter-out %.a %.fa %.mo %$(DSOSUF),$1) \
  64                 $(addprefix $(WL_U), \
  65                      $(filter $(call defined-symbols,$(filter %.a %.fa, $1)), \
  66                 $(call undefined-symbols,$(filter %.mo %$(DSOSUF),$1)))) \
  67                 $(foreach l,$(filter %.fa,$1),$(call whole-archive,$l)) \
  68                 $(filter %.a,$1)
  69
  70 extract-libs = $(strip $(foreach o,$(filter-out %.mo %$(DSOSUF),$1),$($o-libs)))
  71 expand-objs = $(strip $(sort $(filter %.o,$1)) \
  72                 $(foreach o,$(filter %.mo %$(DSOSUF),$1),$($o-objs)) \
  73                 $(filter-out %.o %.mo %$(DSOSUF),$1))
  74
  75 %.o: %.c
  76         @mkdir -p $(dir $@)
  77         $(call quiet-command,$(CC) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \
  78                $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) \
  79                -c -o $@ $<,"CC","$(TARGET_DIR)$@")
  80
  81 # If we have a CXX we might have some C++ objects, in which case we
  82 # must link with the C++ compiler, not the plain C compiler.
  83 LINKPROG = $(or $(CXX),$(CC))
  84
  85 LINK = $(call quiet-command, $(LINKPROG) $(CFLAGS) $(QEMU_LDFLAGS) -o $@ \
  86        $(call process-archive-undefs, $1) \
  87        $(call extract-libs,$1) $(LIBS),"LINK","$(TARGET_DIR)$@")
  88
  89 %.o: %.S
  90         $(call quiet-command,$(CCAS) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \
  91                $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) \
  92                -c -o $@ $<,"CCAS","$(TARGET_DIR)$@")
  93
  94 %.o: %.cc
  95         $(call quiet-command,$(CXX) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \
  96                $(QEMU_CXXFLAGS) $(QEMU_DGFLAGS) $(CXXFLAGS) $($@-cflags) \
  97                -c -o $@ $<,"CXX","$(TARGET_DIR)$@")
  98
  99 %.o: %.cpp
 100         $(call quiet-command,$(CXX) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \
 101                $(QEMU_CXXFLAGS) $(QEMU_DGFLAGS) $(CXXFLAGS) $($@-cflags) \
 102                -c -o $@ $<,"CXX","$(TARGET_DIR)$@")
 103
 104 %.o: %.m
 105         $(call quiet-command,$(OBJCC) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \
 106                $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) \
 107                -c -o $@ $<,"OBJC","$(TARGET_DIR)$@")
 108
 109 %.o: %.dtrace
 110         $(call quiet-command,dtrace -o $@ -G -s $<,"GEN","$(TARGET_DIR)$@")
 111
 112 DSO_OBJ_CFLAGS := -fPIC -DBUILD_DSO
 113 module-common.o: CFLAGS += $(DSO_OBJ_CFLAGS)
 114 %$(DSOSUF): QEMU_LDFLAGS += $(LDFLAGS_SHARED)
 115 %$(DSOSUF): %.mo
 116         $(call LINK,$^)
 117         @# Copy to build root so modules can be loaded when program started without install
 118         $(if $(findstring /,$@),$(call quiet-command,cp $@ $(subst /,-,$@),"CP","$(subst /,-,$@)"))
 119
 120
 121 LD_REL := $(CC) -nostdlib $(LD_REL_FLAGS)
 122
 123 %.mo:
 124         $(call quiet-command,$(LD_REL) -o $@ $^,"LD","$(TARGET_DIR)$@")
 125
 126 .PHONY: modules
 127 modules:
 128
 129 %$(EXESUF): %.o
 130         $(call LINK,$(filter %.o %.a %.mo %.fa, $^))
 131
 132 %.a:
 133         $(call quiet-command,rm -f $@ && $(AR) rcs $@ $^,"AR","$(TARGET_DIR)$@")
 134
 135 # Usage: $(call quiet-command,command and args,"NAME","args to print")
 136 # This will run "command and args", and either:
 137 #  if V=1 just print the whole command and args
 138 #  otherwise print the 'quiet' output in the format "  NAME     args to print"
 139 # NAME should be a short name of the command, 7 letters or fewer.
 140 # If called with only a single argument, will print nothing in quiet mode.
 141 quiet-command-run = $(if $(V),,$(if $2,printf "  %-7s %s\n" $2 $3 && ))$1
 142 quiet-@ = $(if $(V),,@)
 143 quiet-command = $(quiet-@)$(call quiet-command-run,$1,$2,$3)
 144
 145 # cc-option
 146 # Usage: CFLAGS+=$(call cc-option, -falign-functions=0, -malign-functions=0)
 147
 148 cc-option = $(if $(shell $(CC) $1 $2 -S -o /dev/null -xc /dev/null \
 149               >/dev/null 2>&1 && echo OK), $2, $3)
 150 cc-c-option = $(if $(shell $(CC) $1 $2 -c -o /dev/null -xc /dev/null \
 151                 >/dev/null 2>&1 && echo OK), $2, $3)
 152
 153 VPATH_SUFFIXES = %.c %.h %.S %.cc %.cpp %.m %.mak %.texi %.sh %.rc Kconfig% %.json.in
 154 set-vpath = $(if $1,$(foreach PATTERN,$(VPATH_SUFFIXES),$(eval vpath $(PATTERN) $1)))
 155
 156 # install-prog list, dir
 157 define install-prog
 158         $(INSTALL_DIR) "$2"
 159         $(INSTALL_PROG) $1 "$2"
 160         $(if $(STRIP),$(STRIP) $(foreach T,$1,"$2/$(notdir $T)"),)
 161 endef
 162
 163 # find-in-path
 164 # Usage: $(call find-in-path, prog)
 165 # Looks in the PATH if the argument contains no slash, else only considers one
 166 # specific directory.  Returns an # empty string if the program doesn't exist
 167 # there.
 168 find-in-path = $(if $(findstring /, $1), \
 169         $(wildcard $1), \
 170         $(wildcard $(patsubst %, %/$1, $(subst :, ,$(PATH)))))
 171
 172 # Logical functions (for operating on y/n values like CONFIG_FOO vars)
 173 # Inputs to these must be either "y" (true) or "n" or "" (both false)
 174 # Output is always either "y" or "n".
 175 # Usage: $(call land,$(CONFIG_FOO),$(CONFIG_BAR))
 176 # Logical NOT
 177 lnot = $(if $(subst n,,$1),n,y)
 178 # Logical AND
 179 land = $(if $(findstring yy,$1$2),y,n)
 180 # Logical OR
 181 lor = $(if $(findstring y,$1$2),y,n)
 182 # Logical XOR (note that this is the inverse of leqv)
 183 lxor = $(if $(filter $(call lnot,$1),$(call lnot,$2)),n,y)
 184 # Logical equivalence (note that leqv "","n" is true)
 185 leqv = $(if $(filter $(call lnot,$1),$(call lnot,$2)),y,n)
 186 # Logical if: like make's $(if) but with an leqv-like test
 187 lif = $(if $(subst n,,$1),$2,$3)
 188
 189 # String testing functions: inputs to these can be any string;
 190 # the output is always either "y" or "n". Leading and trailing whitespace
 191 # is ignored when comparing strings.
 192 # String equality
 193 eq = $(if $(subst $2,,$1)$(subst $1,,$2),n,y)
 194 # String inequality
 195 ne = $(if $(subst $2,,$1)$(subst $1,,$2),y,n)
 196 # Emptiness/non-emptiness tests:
 197 isempty = $(if $1,n,y)
 198 notempty = $(if $1,y,n)
 199
 200 .PHONY: clean-timestamp
 201 clean-timestamp:
 202         rm -f *.timestamp
 203 clean: clean-timestamp
 204
 205 # will delete the target of a rule if commands exit with a nonzero exit status
 206 .DELETE_ON_ERROR:
 207
 208 # save-vars
 209 # Usage: $(call save-vars, vars)
 210 # Save each variable $v in $vars as save-vars-$v, save their object's
 211 # variables, then clear $v.  saved-vars-$v contains the variables that
 212 # where saved for the objects, in order to speedup load-vars.
 213 define save-vars
 214     $(foreach v,$1,
 215         $(eval save-vars-$v := $(value $v))
 216         $(eval saved-vars-$v := $(foreach o,$($v), \
 217             $(if $($o-cflags), $o-cflags $(eval save-vars-$o-cflags := $($o-cflags))$(eval $o-cflags := )) \
 218             $(if $($o-libs), $o-libs $(eval save-vars-$o-libs := $($o-libs))$(eval $o-libs := )) \
 219             $(if $($o-objs), $o-objs $(eval save-vars-$o-objs := $($o-objs))$(eval $o-objs := ))))
 220         $(eval $v := ))
 221 endef
 222
 223 # load-vars
 224 # Usage: $(call load-vars, vars, add_var)
 225 # Load the saved value for each variable in @vars, and the per object
 226 # variables.
 227 # Append @add_var's current value to the loaded value.
 228 define load-vars
 229     $(eval $2-new-value := $(value $2))
 230     $(foreach v,$1,
 231         $(eval $v := $(value save-vars-$v))
 232         $(foreach o,$(saved-vars-$v),
 233             $(eval $o := $(save-vars-$o)) $(eval save-vars-$o := ))
 234         $(eval save-vars-$v := )
 235         $(eval saved-vars-$v := ))
 236     $(eval $2 := $(value $2) $($2-new-value))
 237 endef
 238
 239 # fix-paths
 240 # Usage: $(call fix-paths, obj_path, src_path, vars)
 241 # Add prefix @obj_path to all objects in @vars, and add prefix @src_path to all
 242 # directories in @vars.
 243 define fix-paths
 244     $(foreach v,$3,
 245         $(foreach o,$($v),
 246             $(if $($o-libs),
 247                 $(eval $1$o-libs := $($o-libs)))
 248             $(if $($o-cflags),
 249                 $(eval $1$o-cflags := $($o-cflags)))
 250             $(if $($o-objs),
 251                 $(eval $1$o-objs := $(addprefix $1,$($o-objs)))))
 252         $(eval $v := $(addprefix $1,$(filter-out %/,$($v))) \
 253                      $(addprefix $2,$(filter %/,$($v)))))
 254 endef
 255
 256 # unnest-var-recursive
 257 # Usage: $(call unnest-var-recursive, obj_prefix, vars, var)
 258 #
 259 # Unnest @var by including subdir Makefile.objs, while protect others in @vars
 260 # unchanged.
 261 #
 262 # @obj_prefix is the starting point of object path prefix.
 263 #
 264 define unnest-var-recursive
 265     $(eval dirs := $(sort $(filter %/,$($3))))
 266     $(eval $3 := $(filter-out %/,$($3)))
 267     $(foreach d,$(dirs:%/=%),
 268             $(call save-vars,$2)
 269             $(eval obj := $(if $1,$1/)$d)
 270             $(eval -include $(SRC_PATH)/$d/Makefile.objs)
 271             $(call fix-paths,$(if $1,$1/)$d/,$d/,$2)
 272             $(call load-vars,$2,$3)
 273             $(call unnest-var-recursive,$1,$2,$3))
 274 endef
 275
 276 # unnest-vars
 277 # Usage: $(call unnest-vars, obj_prefix, vars)
 278 #
 279 # @obj_prefix: object path prefix, can be empty, or '..', etc. Don't include
 280 # ending '/'.
 281 #
 282 # @vars: the list of variable names to unnest.
 283 #
 284 # This macro will scan subdirectories's Makefile.objs, include them, to build
 285 # up each variable listed in @vars.
 286 #
 287 # Per object and per module cflags and libs are saved with relative path fixed
 288 # as well, those variables include -libs, -cflags and -objs. Items in -objs are
 289 # also fixed to relative path against SRC_PATH plus the prefix @obj_prefix.
 290 #
 291 # All nested variables postfixed by -m in names are treated as DSO variables,
 292 # and will be built as modules, if enabled.
 293 #
 294 # A simple example of the unnest:
 295 #
 296 #     obj_prefix = ..
 297 #     vars = hot cold
 298 #     hot  = fire.o sun.o season/
 299 #     cold = snow.o water/ season/
 300 #
 301 # Unnest through a faked source directory structure:
 302 #
 303 #     SRC_PATH
 304 #        ├── water
 305 #        │   └── Makefile.objs──────────────────┐
 306 #        │       │ hot += steam.o               │
 307 #        │       │ cold += ice.mo               │
 308 #        │       │ ice.mo-libs := -licemaker    │
 309 #        │       │ ice.mo-objs := ice1.o ice2.o │
 310 #        │       └──────────────────────────────┘
 311 #        │
 312 #        └── season
 313 #            └── Makefile.objs──────┐
 314 #                │ hot += summer.o  │
 315 #                │ cold += winter.o │
 316 #                └──────────────────┘
 317 #
 318 # In the end, the result will be:
 319 #
 320 #     hot  = ../fire.o ../sun.o ../season/summer.o
 321 #     cold = ../snow.o ../water/ice.mo ../season/winter.o
 322 #     ../water/ice.mo-libs = -licemaker
 323 #     ../water/ice.mo-objs = ../water/ice1.o ../water/ice2.o
 324 #
 325 # Note that 'hot' didn't include 'water/' in the input, so 'steam.o' is not
 326 # included.
 327 #
 328 define unnest-vars
 329     # In the case of target build (i.e. $1 == ..), fix path for top level
 330     # Makefile.objs objects
 331     $(if $1,$(call fix-paths,$1/,,$2))
 332
 333     # Descend and include every subdir Makefile.objs
 334     $(foreach v, $2,
 335         $(call unnest-var-recursive,$1,$2,$v)
 336         # Pass the .mo-cflags and .mo-libs along to its member objects
 337         $(foreach o, $(filter %.mo,$($v)),
 338             $(foreach p,$($o-objs),
 339                 $(if $($o-cflags), $(eval $p-cflags += $($o-cflags)))
 340                 $(if $($o-libs), $(eval $p-libs += $($o-libs))))))
 341
 342     # For all %.mo objects that are directly added into -y, just expand them
 343     $(foreach v,$(filter %-y,$2),
 344         $(eval $v := $(foreach o,$($v),$(if $($o-objs),$($o-objs),$o))))
 345
 346     $(foreach v,$(filter %-m,$2),
 347         # All .o found in *-m variables are single object modules, create .mo
 348         # for them
 349         $(foreach o,$(filter %.o,$($v)),
 350             $(eval $(o:%.o=%.mo)-objs := $o))
 351         # Now unify .o in -m variable to .mo
 352         $(eval $v := $($v:%.o=%.mo))
 353         $(eval modules-m += $($v))
 354
 355         # For module build, build shared libraries during "make modules"
 356         # For non-module build, add -m to -y
 357         $(if $(CONFIG_MODULES),
 358              $(foreach o,$($v),
 359                    $(eval $($o-objs): CFLAGS += $(DSO_OBJ_CFLAGS))
 360                    $(eval $o: $($o-objs)))
 361              $(eval $(patsubst %-m,%-y,$v) += $($v))
 362              $(eval modules: $($v:%.mo=%$(DSOSUF))),
 363              $(eval $(patsubst %-m,%-y,$v) += $(call expand-objs, $($v)))))
 364
 365     # Post-process all the unnested vars
 366     $(foreach v,$2,
 367         $(foreach o, $(filter %.mo,$($v)),
 368             # Find all the .mo objects in variables and add dependency rules
 369             # according to .mo-objs. Report error if not set
 370             $(if $($o-objs),
 371                 $(eval $(o:%.mo=%$(DSOSUF)): module-common.o $($o-objs))))
 372         $(shell mkdir -p ./ $(sort $(dir $($v))))
 373         # Include all the .d files
 374         $(eval -include $(patsubst %.o,%.d,$(patsubst %.mo,%.d,$(filter %.o,$($v)))))
 375         $(eval $v := $(filter-out %/,$($v))))
 376 endef
 377
 378 print-%:
 379         @echo '$*=$($*)'