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 clean-target:
  25
  26 # Flags for dependency generation
  27 QEMU_DGFLAGS += -MMD -MP -MT $@ -MF $(@D)/$(*F).d
  28
  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)
  36
  37 WL_U := -Wl,-u,
  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}')
  41
  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.
  44 #
  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.
  49 #
  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
  52 # in LINK.
  53 #
  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)))) \
  61                 $(filter %.a,$1)
  62
  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))
  67
  68 %.o: %.c
  69         $(call quiet-command,$(CC) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \
  70                $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) \
  71                -c -o $@ $<,"CC","$(TARGET_DIR)$@")
  72 %.o: %.rc
  73         $(call quiet-command,$(WINDRES) -I. -o $@ $<,"RC","$(TARGET_DIR)$@")
  74
  75 # If we have a CXX we might have some C++ objects, in which case we
  76 # must link with the C++ compiler, not the plain C compiler.
  77 LINKPROG = $(or $(CXX),$(CC))
  78
  79 LINK = $(call quiet-command, $(LINKPROG) $(QEMU_LDFLAGS) $(QEMU_CFLAGS) $(CFLAGS) $(LDFLAGS) -o $@ \
  80        $(call process-archive-undefs, $1) \
  81        $(version-obj-y) $(call extract-libs,$1) $(LIBS),"LINK","$(TARGET_DIR)$@")
  82
  83 %.o: %.S
  84         $(call quiet-command,$(CCAS) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \
  85                $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) \
  86                -c -o $@ $<,"CCAS","$(TARGET_DIR)$@")
  87
  88 %.o: %.cc
  89         $(call quiet-command,$(CXX) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \
  90                $(QEMU_CXXFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) \
  91                -c -o $@ $<,"CXX","$(TARGET_DIR)$@")
  92
  93 %.o: %.cpp
  94         $(call quiet-command,$(CXX) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \
  95                $(QEMU_CXXFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) \
  96                -c -o $@ $<,"CXX","$(TARGET_DIR)$@")
  97
  98 %.o: %.m
  99         $(call quiet-command,$(OBJCC) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \
 100                $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) \
 101                -c -o $@ $<,"OBJC","$(TARGET_DIR)$@")
 102
 103 %.o: %.dtrace
 104         $(call quiet-command,dtrace -o $@ -G -s $<,"GEN","$(TARGET_DIR)$@")
 105
 106 DSO_OBJ_CFLAGS := -fPIC -DBUILD_DSO
 107 module-common.o: CFLAGS += $(DSO_OBJ_CFLAGS)
 108 %$(DSOSUF): LDFLAGS += $(LDFLAGS_SHARED)
 109 %$(DSOSUF): %.mo
 110         $(call LINK,$^)
 111         @# Copy to build root so modules can be loaded when program started without install
 112         $(if $(findstring /,$@),$(call quiet-command,cp $@ $(subst /,-,$@),"CP","$(subst /,-,$@)"))
 113
 114
 115 LD_REL := $(CC) -nostdlib $(LD_REL_FLAGS)
 116
 117 %.mo:
 118         $(call quiet-command,$(LD_REL) -o $@ $^,"LD","$(TARGET_DIR)$@")
 119
 120 .PHONY: modules
 121 modules:
 122
 123 %$(EXESUF): %.o
 124         $(call LINK,$(filter %.o %.a %.mo, $^))
 125
 126 %.a:
 127         $(call quiet-command,rm -f $@ && $(AR) rcs $@ $^,"AR","$(TARGET_DIR)$@")
 128
 129 # Usage: $(call quiet-command,command and args,"NAME","args to print")
 130 # This will run "command and args", and either:
 131 #  if V=1 just print the whole command and args
 132 #  otherwise print the 'quiet' output in the format "  NAME     args to print"
 133 # NAME should be a short name of the command, 7 letters or fewer.
 134 # If called with only a single argument, will print nothing in quiet mode.
 135 quiet-command = $(if $(V),$1,$(if $(2),@printf "  %-7s %s\n" $2 $3 && $1, @$1))
 136
 137 # cc-option
 138 # Usage: CFLAGS+=$(call cc-option, -falign-functions=0, -malign-functions=0)
 139
 140 cc-option = $(if $(shell $(CC) $1 $2 -S -o /dev/null -xc /dev/null \
 141               >/dev/null 2>&1 && echo OK), $2, $3)
 142 cc-c-option = $(if $(shell $(CC) $1 $2 -c -o /dev/null -xc /dev/null \
 143                 >/dev/null 2>&1 && echo OK), $2, $3)
 144
 145 VPATH_SUFFIXES = %.c %.h %.S %.cc %.cpp %.m %.mak %.texi %.sh %.rc
 146 set-vpath = $(if $1,$(foreach PATTERN,$(VPATH_SUFFIXES),$(eval vpath $(PATTERN) $1)))
 147
 148 # install-prog list, dir
 149 define install-prog
 150         $(INSTALL_DIR) "$2"
 151         $(INSTALL_PROG) $1 "$2"
 152         $(if $(STRIP),$(STRIP) $(foreach T,$1,"$2/$(notdir $T)"),)
 153 endef
 154
 155 # find-in-path
 156 # Usage: $(call find-in-path, prog)
 157 # Looks in the PATH if the argument contains no slash, else only considers one
 158 # specific directory.  Returns an # empty string if the program doesn't exist
 159 # there.
 160 find-in-path = $(if $(findstring /, $1), \
 161         $(wildcard $1), \
 162         $(wildcard $(patsubst %, %/$1, $(subst :, ,$(PATH)))))
 163
 164 # Logical functions (for operating on y/n values like CONFIG_FOO vars)
 165 # Inputs to these must be either "y" (true) or "n" or "" (both false)
 166 # Output is always either "y" or "n".
 167 # Usage: $(call land,$(CONFIG_FOO),$(CONFIG_BAR))
 168 # Logical NOT
 169 lnot = $(if $(subst n,,$1),n,y)
 170 # Logical AND
 171 land = $(if $(findstring yy,$1$2),y,n)
 172 # Logical OR
 173 lor = $(if $(findstring y,$1$2),y,n)
 174 # Logical XOR (note that this is the inverse of leqv)
 175 lxor = $(if $(filter $(call lnot,$1),$(call lnot,$2)),n,y)
 176 # Logical equivalence (note that leqv "","n" is true)
 177 leqv = $(if $(filter $(call lnot,$1),$(call lnot,$2)),y,n)
 178 # Logical if: like make's $(if) but with an leqv-like test
 179 lif = $(if $(subst n,,$1),$2,$3)
 180
 181 # String testing functions: inputs to these can be any string;
 182 # the output is always either "y" or "n". Leading and trailing whitespace
 183 # is ignored when comparing strings.
 184 # String equality
 185 eq = $(if $(subst $2,,$1)$(subst $1,,$2),n,y)
 186 # String inequality
 187 ne = $(if $(subst $2,,$1)$(subst $1,,$2),y,n)
 188 # Emptiness/non-emptiness tests:
 189 isempty = $(if $1,n,y)
 190 notempty = $(if $1,y,n)
 191
 192 # Generate files with tracetool
 193 TRACETOOL=$(PYTHON) $(SRC_PATH)/scripts/tracetool.py
 194
 195 # Generate timestamp files for .h include files
 196
 197 config-%.h: config-%.h-timestamp
 198         @cmp $< $@ >/dev/null 2>&1 || cp $< $@
 199
 200 config-%.h-timestamp: config-%.mak $(SRC_PATH)/scripts/create_config
 201         $(call quiet-command, sh $(SRC_PATH)/scripts/create_config < $< > $@,"GEN","$(TARGET_DIR)config-$*.h")
 202
 203 .PHONY: clean-timestamp
 204 clean-timestamp:
 205         rm -f *.timestamp
 206 clean: clean-timestamp
 207
 208 # will delete the target of a rule if commands exit with a nonzero exit status
 209 .DELETE_ON_ERROR:
 210
 211 # save-vars
 212 # Usage: $(call save-vars, vars)
 213 # Save each variable $v in $vars as save-vars-$v, save their object's
 214 # variables, then clear $v.  saved-vars-$v contains the variables that
 215 # where saved for the objects, in order to speedup load-vars.
 216 define save-vars
 217     $(foreach v,$1,
 218         $(eval save-vars-$v := $(value $v))
 219         $(eval saved-vars-$v := $(foreach o,$($v), \
 220             $(if $($o-cflags), $o-cflags $(eval save-vars-$o-cflags := $($o-cflags))$(eval $o-cflags := )) \
 221             $(if $($o-libs), $o-libs $(eval save-vars-$o-libs := $($o-libs))$(eval $o-libs := )) \
 222             $(if $($o-objs), $o-objs $(eval save-vars-$o-objs := $($o-objs))$(eval $o-objs := ))))
 223         $(eval $v := ))
 224 endef
 225
 226 # load-vars
 227 # Usage: $(call load-vars, vars, add_var)
 228 # Load the saved value for each variable in @vars, and the per object
 229 # variables.
 230 # Append @add_var's current value to the loaded value.
 231 define load-vars
 232     $(eval $2-new-value := $(value $2))
 233     $(foreach v,$1,
 234         $(eval $v := $(value save-vars-$v))
 235         $(foreach o,$(saved-vars-$v),
 236             $(eval $o := $(save-vars-$o)) $(eval save-vars-$o := ))
 237         $(eval save-vars-$v := )
 238         $(eval saved-vars-$v := ))
 239     $(eval $2 := $(value $2) $($2-new-value))
 240 endef
 241
 242 # fix-paths
 243 # Usage: $(call fix-paths, obj_path, src_path, vars)
 244 # Add prefix @obj_path to all objects in @vars, and add prefix @src_path to all
 245 # directories in @vars.
 246 define fix-paths
 247     $(foreach v,$3,
 248         $(foreach o,$($v),
 249             $(if $($o-libs),
 250                 $(eval $1$o-libs := $($o-libs)))
 251             $(if $($o-cflags),
 252                 $(eval $1$o-cflags := $($o-cflags)))
 253             $(if $($o-objs),
 254                 $(eval $1$o-objs := $(addprefix $1,$($o-objs)))))
 255         $(eval $v := $(addprefix $1,$(filter-out %/,$($v))) \
 256                      $(addprefix $2,$(filter %/,$($v)))))
 257 endef
 258
 259 # unnest-var-recursive
 260 # Usage: $(call unnest-var-recursive, obj_prefix, vars, var)
 261 #
 262 # Unnest @var by including subdir Makefile.objs, while protect others in @vars
 263 # unchanged.
 264 #
 265 # @obj_prefix is the starting point of object path prefix.
 266 #
 267 define unnest-var-recursive
 268     $(eval dirs := $(sort $(filter %/,$($3))))
 269     $(eval $3 := $(filter-out %/,$($3)))
 270     $(foreach d,$(dirs:%/=%),
 271             $(call save-vars,$2)
 272             $(eval obj := $(if $1,$1/)$d)
 273             $(eval -include $(SRC_PATH)/$d/Makefile.objs)
 274             $(call fix-paths,$(if $1,$1/)$d/,$d/,$2)
 275             $(call load-vars,$2,$3)
 276             $(call unnest-var-recursive,$1,$2,$3))
 277 endef
 278
 279 # unnest-vars
 280 # Usage: $(call unnest-vars, obj_prefix, vars)
 281 #
 282 # @obj_prefix: object path prefix, can be empty, or '..', etc. Don't include
 283 # ending '/'.
 284 #
 285 # @vars: the list of variable names to unnest.
 286 #
 287 # This macro will scan subdirectories's Makefile.objs, include them, to build
 288 # up each variable listed in @vars.
 289 #
 290 # Per object and per module cflags and libs are saved with relative path fixed
 291 # as well, those variables include -libs, -cflags and -objs. Items in -objs are
 292 # also fixed to relative path against SRC_PATH plus the prefix @obj_prefix.
 293 #
 294 # All nested variables postfixed by -m in names are treated as DSO variables,
 295 # and will be built as modules, if enabled.
 296 #
 297 # A simple example of the unnest:
 298 #
 299 #     obj_prefix = ..
 300 #     vars = hot cold
 301 #     hot  = fire.o sun.o season/
 302 #     cold = snow.o water/ season/
 303 #
 304 # Unnest through a faked source directory structure:
 305 #
 306 #     SRC_PATH
 307 #        ├── water
 308 #        │   └── Makefile.objs──────────────────┐
 309 #        │       │ hot += steam.o               │
 310 #        │       │ cold += ice.mo               │
 311 #        │       │ ice.mo-libs := -licemaker    │
 312 #        │       │ ice.mo-objs := ice1.o ice2.o │
 313 #        │       └──────────────────────────────┘
 314 #        │
 315 #        └── season
 316 #            └── Makefile.objs──────┐
 317 #                │ hot += summer.o  │
 318 #                │ cold += winter.o │
 319 #                └──────────────────┘
 320 #
 321 # In the end, the result will be:
 322 #
 323 #     hot  = ../fire.o ../sun.o ../season/summer.o
 324 #     cold = ../snow.o ../water/ice.mo ../season/winter.o
 325 #     ../water/ice.mo-libs = -licemaker
 326 #     ../water/ice.mo-objs = ../water/ice1.o ../water/ice2.o
 327 #
 328 # Note that 'hot' didn't include 'season/' in the input, so 'summer.o' is not
 329 # included.
 330 #
 331 define unnest-vars
 332     # In the case of target build (i.e. $1 == ..), fix path for top level
 333     # Makefile.objs objects
 334     $(if $1,$(call fix-paths,$1/,,$2))
 335
 336     # Descend and include every subdir Makefile.objs
 337     $(foreach v, $2,
 338         $(call unnest-var-recursive,$1,$2,$v)
 339         # Pass the .mo-cflags and .mo-libs along to its member objects
 340         $(foreach o, $(filter %.mo,$($v)),
 341             $(foreach p,$($o-objs),
 342                 $(if $($o-cflags), $(eval $p-cflags += $($o-cflags)))
 343                 $(if $($o-libs), $(eval $p-libs += $($o-libs))))))
 344
 345     # For all %.mo objects that are directly added into -y, just expand them
 346     $(foreach v,$(filter %-y,$2),
 347         $(eval $v := $(foreach o,$($v),$(if $($o-objs),$($o-objs),$o))))
 348
 349     $(foreach v,$(filter %-m,$2),
 350         # All .o found in *-m variables are single object modules, create .mo
 351         # for them
 352         $(foreach o,$(filter %.o,$($v)),
 353             $(eval $(o:%.o=%.mo)-objs := $o))
 354         # Now unify .o in -m variable to .mo
 355         $(eval $v := $($v:%.o=%.mo))
 356         $(eval modules-m += $($v))
 357
 358         # For module build, build shared libraries during "make modules"
 359         # For non-module build, add -m to -y
 360         $(if $(CONFIG_MODULES),
 361              $(foreach o,$($v),
 362                    $(eval $($o-objs): CFLAGS += $(DSO_OBJ_CFLAGS))
 363                    $(eval $o: $($o-objs)))
 364              $(eval $(patsubst %-m,%-y,$v) += $($v))
 365              $(eval modules: $($v:%.mo=%$(DSOSUF))),
 366              $(eval $(patsubst %-m,%-y,$v) += $(call expand-objs, $($v)))))
 367
 368     # Post-process all the unnested vars
 369     $(foreach v,$2,
 370         $(foreach o, $(filter %.mo,$($v)),
 371             # Find all the .mo objects in variables and add dependency rules
 372             # according to .mo-objs. Report error if not set
 373             $(if $($o-objs),
 374                 $(eval $(o:%.mo=%$(DSOSUF)): module-common.o $($o-objs)),
 375                 $(error $o added in $v but $o-objs is not set)))
 376         $(shell mkdir -p ./ $(sort $(dir $($v))))
 377         # Include all the .d files
 378         $(eval -include $(patsubst %.o,%.d,$(patsubst %.mo,%.d,$($v))))
 379         $(eval $v := $(filter-out %/,$($v))))
 380 endef
 381
 382 TEXI2MAN = $(call quiet-command, \
 383         perl -Ww -- $(SRC_PATH)/scripts/texi2pod.pl $(TEXI2PODFLAGS) $< $@.pod && \
 384         $(POD2MAN) --section=$(subst .,,$(suffix $@)) --center=" " --release=" " $@.pod > $@, \
 385         "GEN","$@")
 386
 387 %.1:
 388         $(call TEXI2MAN)
 389 %.7:
 390         $(call TEXI2MAN)
 391 %.8:
 392         $(call TEXI2MAN)