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 C++ compilation
  27 QEMU_CXXFLAGS = -D__STDC_LIMIT_MACROS $(filter-out -Wstrict-prototypes -Wmissing-prototypes -Wnested-externs -Wno-override-init -Wold-style-declaration -Wold-style-definition -Wredundant-decls, $(QEMU_CFLAGS))
  28
  29 # Flags for dependency generation
  30 QEMU_DGFLAGS += -MMD -MP -MT $@ -MF $(@D)/$(*F).d
  31
  32 # Compiler searches the source file dir first, but in vpath builds
  33 # we need to make it search the build dir too, before any other
  34 # explicit search paths. There are two search locations in the build
  35 # dir, one absolute and the other relative to the compiler working
  36 # directory. These are the same for target-independent files, but
  37 # different for target-dependent ones.
  38 QEMU_LOCAL_INCLUDES = -iquote $(BUILD_DIR)/$(@D) -iquote $(@D)
  39
  40 WL_U := -Wl,-u,
  41 find-symbols = $(if $1, $(sort $(shell $(NM) -P -g $1 | $2)))
  42 defined-symbols = $(call find-symbols,$1,awk '$$2!="U"{print $$1}')
  43 undefined-symbols = $(call find-symbols,$1,awk '$$2=="U"{print $$1}')
  44
  45 # All the .mo objects in -m variables are also added into corresponding -y
  46 # variable in unnest-vars, but filtered out here, when LINK is called.
  47 #
  48 # The .mo objects are supposed to be linked as a DSO, for module build. So here
  49 # they are only used as a placeholders to generate those "archive undefined"
  50 # symbol options (-Wl,-u,$symbol_name), which are the archive functions
  51 # referenced by the code in the DSO.
  52 #
  53 # Also the presence in -y variables will also guarantee they are built before
  54 # linking executables that will load them. So we can look up symbol reference
  55 # in LINK.
  56 #
  57 # This is necessary because the exectuable itself may not use the function, in
  58 # which case the function would not be linked in. Then the DSO loading will
  59 # fail because of the missing symbol.
  60 process-archive-undefs = $(filter-out %.a %.mo,$1) \
  61                 $(addprefix $(WL_U), \
  62                      $(filter $(call defined-symbols,$(filter %.a, $1)), \
  63                               $(call undefined-symbols,$(filter %.mo,$1)))) \
  64                 $(filter %.a,$1)
  65
  66 extract-libs = $(strip $(foreach o,$(filter-out %.mo,$1),$($o-libs)))
  67 expand-objs = $(strip $(sort $(filter %.o,$1)) \
  68                   $(foreach o,$(filter %.mo,$1),$($o-objs)) \
  69                   $(filter-out %.o %.mo,$1))
  70
  71 %.o: %.c
  72         $(call quiet-command,$(CC) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \
  73                $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) \
  74                -c -o $@ $<,"CC","$(TARGET_DIR)$@")
  75 %.o: %.rc
  76         $(call quiet-command,$(WINDRES) -I. -o $@ $<,"RC","$(TARGET_DIR)$@")
  77
  78 # If we have a CXX we might have some C++ objects, in which case we
  79 # must link with the C++ compiler, not the plain C compiler.
  80 LINKPROG = $(or $(CXX),$(CC))
  81
  82 LINK = $(call quiet-command, $(LINKPROG) $(QEMU_LDFLAGS) $(QEMU_CFLAGS) $(CFLAGS) $(LDFLAGS) -o $@ \
  83        $(call process-archive-undefs, $1) \
  84        $(version-obj-y) $(call extract-libs,$1) $(LIBS),"LINK","$(TARGET_DIR)$@")
  85
  86 %.o: %.S
  87         $(call quiet-command,$(CCAS) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \
  88                $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) \
  89                -c -o $@ $<,"CCAS","$(TARGET_DIR)$@")
  90
  91 %.o: %.cc
  92         $(call quiet-command,$(CXX) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \
  93                $(QEMU_CXXFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) \
  94                -c -o $@ $<,"CXX","$(TARGET_DIR)$@")
  95
  96 %.o: %.cpp
  97         $(call quiet-command,$(CXX) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \
  98                $(QEMU_CXXFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) \
  99                -c -o $@ $<,"CXX","$(TARGET_DIR)$@")
 100
 101 %.o: %.m
 102         $(call quiet-command,$(OBJCC) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \
 103                $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) \
 104                -c -o $@ $<,"OBJC","$(TARGET_DIR)$@")
 105
 106 %.o: %.dtrace
 107         $(call quiet-command,dtrace -o $@ -G -s $<,"GEN","$(TARGET_DIR)$@")
 108
 109 ifdef CONFIG_WIN32
 110 DSO_OBJ_CFLAGS := -DBUILD_DSO
 111 else
 112 DSO_OBJ_CFLAGS := -fPIC -DBUILD_DSO
 113 endif
 114 module-common.o: CFLAGS += $(DSO_OBJ_CFLAGS)
 115 %$(DSOSUF): LDFLAGS += $(LDFLAGS_SHARED)
 116 %$(DSOSUF): %.mo
 117         $(call LINK,$^)
 118         @# Copy to build root so modules can be loaded when program started without install
 119         $(if $(findstring /,$@),$(call quiet-command,cp $@ $(subst /,-,$@),"CP","$(subst /,-,$@)"))
 120
 121
 122 LD_REL := $(CC) -nostdlib $(LD_REL_FLAGS)
 123
 124 %.mo:
 125         $(call quiet-command,$(LD_REL) -o $@ $^,"LD","$(TARGET_DIR)$@")
 126
 127 .PHONY: modules
 128 modules:
 129
 130 %$(EXESUF): %.o
 131         $(call LINK,$(filter %.o %.a %.mo, $^))
 132
 133 %.a:
 134         $(call quiet-command,rm -f $@ && $(AR) rcs $@ $^,"AR","$(TARGET_DIR)$@")
 135
 136 # Usage: $(call quiet-command,command and args,"NAME","args to print")
 137 # This will run "command and args", and either:
 138 #  if V=1 just print the whole command and args
 139 #  otherwise print the 'quiet' output in the format "  NAME     args to print"
 140 # NAME should be a short name of the command, 7 letters or fewer.
 141 # If called with only a single argument, will print nothing in quiet mode.
 142 quiet-command = $(if $(V),$1,$(if $(2),@printf "  %-7s %s\n" $2 $3 && $1, @$1))
 143
 144 # cc-option
 145 # Usage: CFLAGS+=$(call cc-option, -falign-functions=0, -malign-functions=0)
 146
 147 cc-option = $(if $(shell $(CC) $1 $2 -S -o /dev/null -xc /dev/null \
 148               >/dev/null 2>&1 && echo OK), $2, $3)
 149 cc-c-option = $(if $(shell $(CC) $1 $2 -c -o /dev/null -xc /dev/null \
 150                 >/dev/null 2>&1 && echo OK), $2, $3)
 151
 152 VPATH_SUFFIXES = %.c %.h %.S %.cc %.cpp %.m %.mak %.texi %.sh %.rc
 153 set-vpath = $(if $1,$(foreach PATTERN,$(VPATH_SUFFIXES),$(eval vpath $(PATTERN) $1)))
 154
 155 # install-prog list, dir
 156 define install-prog
 157         $(INSTALL_DIR) "$2"
 158         $(INSTALL_PROG) $1 "$2"
 159         $(if $(STRIP),$(STRIP) $(foreach T,$1,"$2/$(notdir $T)"),)
 160 endef
 161
 162 # find-in-path
 163 # Usage: $(call find-in-path, prog)
 164 # Looks in the PATH if the argument contains no slash, else only considers one
 165 # specific directory.  Returns an # empty string if the program doesn't exist
 166 # there.
 167 find-in-path = $(if $(findstring /, $1), \
 168         $(wildcard $1), \
 169         $(wildcard $(patsubst %, %/$1, $(subst :, ,$(PATH)))))
 170
 171 # Logical functions (for operating on y/n values like CONFIG_FOO vars)
 172 # Inputs to these must be either "y" (true) or "n" or "" (both false)
 173 # Output is always either "y" or "n".
 174 # Usage: $(call land,$(CONFIG_FOO),$(CONFIG_BAR))
 175 # Logical NOT
 176 lnot = $(if $(subst n,,$1),n,y)
 177 # Logical AND
 178 land = $(if $(findstring yy,$1$2),y,n)
 179 # Logical OR
 180 lor = $(if $(findstring y,$1$2),y,n)
 181 # Logical XOR (note that this is the inverse of leqv)
 182 lxor = $(if $(filter $(call lnot,$1),$(call lnot,$2)),n,y)
 183 # Logical equivalence (note that leqv "","n" is true)
 184 leqv = $(if $(filter $(call lnot,$1),$(call lnot,$2)),y,n)
 185 # Logical if: like make's $(if) but with an leqv-like test
 186 lif = $(if $(subst n,,$1),$2,$3)
 187
 188 # String testing functions: inputs to these can be any string;
 189 # the output is always either "y" or "n". Leading and trailing whitespace
 190 # is ignored when comparing strings.
 191 # String equality
 192 eq = $(if $(subst $2,,$1)$(subst $1,,$2),n,y)
 193 # String inequality
 194 ne = $(if $(subst $2,,$1)$(subst $1,,$2),y,n)
 195 # Emptiness/non-emptiness tests:
 196 isempty = $(if $1,n,y)
 197 notempty = $(if $1,y,n)
 198
 199 # Generate files with tracetool
 200 TRACETOOL=$(PYTHON) $(SRC_PATH)/scripts/tracetool.py
 201
 202 # Generate timestamp files for .h include files
 203
 204 config-%.h: config-%.h-timestamp
 205         @cmp $< $@ >/dev/null 2>&1 || cp $< $@
 206
 207 config-%.h-timestamp: config-%.mak $(SRC_PATH)/scripts/create_config
 208         $(call quiet-command, sh $(SRC_PATH)/scripts/create_config < $< > $@,"GEN","$(TARGET_DIR)config-$*.h")
 209
 210 .PHONY: clean-timestamp
 211 clean-timestamp:
 212         rm -f *.timestamp
 213 clean: clean-timestamp
 214
 215 # will delete the target of a rule if commands exit with a nonzero exit status
 216 .DELETE_ON_ERROR:
 217
 218 # save-vars
 219 # Usage: $(call save-vars, vars)
 220 # Save each variable $v in $vars as save-vars-$v, save their object's
 221 # variables, then clear $v.  saved-vars-$v contains the variables that
 222 # where saved for the objects, in order to speedup load-vars.
 223 define save-vars
 224     $(foreach v,$1,
 225         $(eval save-vars-$v := $(value $v))
 226         $(eval saved-vars-$v := $(foreach o,$($v), \
 227             $(if $($o-cflags), $o-cflags $(eval save-vars-$o-cflags := $($o-cflags))$(eval $o-cflags := )) \
 228             $(if $($o-libs), $o-libs $(eval save-vars-$o-libs := $($o-libs))$(eval $o-libs := )) \
 229             $(if $($o-objs), $o-objs $(eval save-vars-$o-objs := $($o-objs))$(eval $o-objs := ))))
 230         $(eval $v := ))
 231 endef
 232
 233 # load-vars
 234 # Usage: $(call load-vars, vars, add_var)
 235 # Load the saved value for each variable in @vars, and the per object
 236 # variables.
 237 # Append @add_var's current value to the loaded value.
 238 define load-vars
 239     $(eval $2-new-value := $(value $2))
 240     $(foreach v,$1,
 241         $(eval $v := $(value save-vars-$v))
 242         $(foreach o,$(saved-vars-$v),
 243             $(eval $o := $(save-vars-$o)) $(eval save-vars-$o := ))
 244         $(eval save-vars-$v := )
 245         $(eval saved-vars-$v := ))
 246     $(eval $2 := $(value $2) $($2-new-value))
 247 endef
 248
 249 # fix-paths
 250 # Usage: $(call fix-paths, obj_path, src_path, vars)
 251 # Add prefix @obj_path to all objects in @vars, and add prefix @src_path to all
 252 # directories in @vars.
 253 define fix-paths
 254     $(foreach v,$3,
 255         $(foreach o,$($v),
 256             $(if $($o-libs),
 257                 $(eval $1$o-libs := $($o-libs)))
 258             $(if $($o-cflags),
 259                 $(eval $1$o-cflags := $($o-cflags)))
 260             $(if $($o-objs),
 261                 $(eval $1$o-objs := $(addprefix $1,$($o-objs)))))
 262         $(eval $v := $(addprefix $1,$(filter-out %/,$($v))) \
 263                      $(addprefix $2,$(filter %/,$($v)))))
 264 endef
 265
 266 # unnest-var-recursive
 267 # Usage: $(call unnest-var-recursive, obj_prefix, vars, var)
 268 #
 269 # Unnest @var by including subdir Makefile.objs, while protect others in @vars
 270 # unchanged.
 271 #
 272 # @obj_prefix is the starting point of object path prefix.
 273 #
 274 define unnest-var-recursive
 275     $(eval dirs := $(sort $(filter %/,$($3))))
 276     $(eval $3 := $(filter-out %/,$($3)))
 277     $(foreach d,$(dirs:%/=%),
 278             $(call save-vars,$2)
 279             $(eval obj := $(if $1,$1/)$d)
 280             $(eval -include $(SRC_PATH)/$d/Makefile.objs)
 281             $(call fix-paths,$(if $1,$1/)$d/,$d/,$2)
 282             $(call load-vars,$2,$3)
 283             $(call unnest-var-recursive,$1,$2,$3))
 284 endef
 285
 286 # unnest-vars
 287 # Usage: $(call unnest-vars, obj_prefix, vars)
 288 #
 289 # @obj_prefix: object path prefix, can be empty, or '..', etc. Don't include
 290 # ending '/'.
 291 #
 292 # @vars: the list of variable names to unnest.
 293 #
 294 # This macro will scan subdirectories's Makefile.objs, include them, to build
 295 # up each variable listed in @vars.
 296 #
 297 # Per object and per module cflags and libs are saved with relative path fixed
 298 # as well, those variables include -libs, -cflags and -objs. Items in -objs are
 299 # also fixed to relative path against SRC_PATH plus the prefix @obj_prefix.
 300 #
 301 # All nested variables postfixed by -m in names are treated as DSO variables,
 302 # and will be built as modules, if enabled.
 303 #
 304 # A simple example of the unnest:
 305 #
 306 #     obj_prefix = ..
 307 #     vars = hot cold
 308 #     hot  = fire.o sun.o season/
 309 #     cold = snow.o water/ season/
 310 #
 311 # Unnest through a faked source directory structure:
 312 #
 313 #     SRC_PATH
 314 #        ├── water
 315 #        │   └── Makefile.objs──────────────────┐
 316 #        │       │ hot += steam.o               │
 317 #        │       │ cold += ice.mo               │
 318 #        │       │ ice.mo-libs := -licemaker    │
 319 #        │       │ ice.mo-objs := ice1.o ice2.o │
 320 #        │       └──────────────────────────────┘
 321 #        │
 322 #        └── season
 323 #            └── Makefile.objs──────┐
 324 #                │ hot += summer.o  │
 325 #                │ cold += winter.o │
 326 #                └──────────────────┘
 327 #
 328 # In the end, the result will be:
 329 #
 330 #     hot  = ../fire.o ../sun.o ../season/summer.o
 331 #     cold = ../snow.o ../water/ice.mo ../season/winter.o
 332 #     ../water/ice.mo-libs = -licemaker
 333 #     ../water/ice.mo-objs = ../water/ice1.o ../water/ice2.o
 334 #
 335 # Note that 'hot' didn't include 'season/' in the input, so 'summer.o' is not
 336 # included.
 337 #
 338 define unnest-vars
 339     # In the case of target build (i.e. $1 == ..), fix path for top level
 340     # Makefile.objs objects
 341     $(if $1,$(call fix-paths,$1/,,$2))
 342
 343     # Descend and include every subdir Makefile.objs
 344     $(foreach v, $2,
 345         $(call unnest-var-recursive,$1,$2,$v)
 346         # Pass the .mo-cflags and .mo-libs along to its member objects
 347         $(foreach o, $(filter %.mo,$($v)),
 348             $(foreach p,$($o-objs),
 349                 $(if $($o-cflags), $(eval $p-cflags += $($o-cflags)))
 350                 $(if $($o-libs), $(eval $p-libs += $($o-libs))))))
 351
 352     # For all %.mo objects that are directly added into -y, just expand them
 353     $(foreach v,$(filter %-y,$2),
 354         $(eval $v := $(foreach o,$($v),$(if $($o-objs),$($o-objs),$o))))
 355
 356     $(foreach v,$(filter %-m,$2),
 357         # All .o found in *-m variables are single object modules, create .mo
 358         # for them
 359         $(foreach o,$(filter %.o,$($v)),
 360             $(eval $(o:%.o=%.mo)-objs := $o))
 361         # Now unify .o in -m variable to .mo
 362         $(eval $v := $($v:%.o=%.mo))
 363         $(eval modules-m += $($v))
 364
 365         # For module build, build shared libraries during "make modules"
 366         # For non-module build, add -m to -y
 367         $(if $(CONFIG_MODULES),
 368              $(foreach o,$($v),
 369                    $(eval $($o-objs): CFLAGS += $(DSO_OBJ_CFLAGS))
 370                    $(eval $o: $($o-objs)))
 371              $(eval $(patsubst %-m,%-y,$v) += $($v))
 372              $(eval modules: $($v:%.mo=%$(DSOSUF))),
 373              $(eval $(patsubst %-m,%-y,$v) += $(call expand-objs, $($v)))))
 374
 375     # Post-process all the unnested vars
 376     $(foreach v,$2,
 377         $(foreach o, $(filter %.mo,$($v)),
 378             # Find all the .mo objects in variables and add dependency rules
 379             # according to .mo-objs. Report error if not set
 380             $(if $($o-objs),
 381                 $(eval $(o:%.mo=%$(DSOSUF)): module-common.o $($o-objs)),
 382                 $(error $o added in $v but $o-objs is not set)))
 383         $(shell mkdir -p ./ $(sort $(dir $($v))))
 384         # Include all the .d files
 385         $(eval -include $(patsubst %.o,%.d,$(patsubst %.mo,%.d,$($v))))
 386         $(eval $v := $(filter-out %/,$($v))))
 387 endef
 388
 389 TEXI2MAN = $(call quiet-command, \
 390         perl -Ww -- $(SRC_PATH)/scripts/texi2pod.pl $(TEXI2PODFLAGS) $< $@.pod && \
 391         $(POD2MAN) --section=$(subst .,,$(suffix $@)) --center=" " --release=" " $@.pod > $@, \
 392         "GEN","$@")
 393
 394 %.1:
 395         $(call TEXI2MAN)
 396 %.7:
 397         $(call TEXI2MAN)
 398 %.8:
 399         $(call TEXI2MAN)