rules.mak

   1
   2 COMMA := ,
   3
   4 # Don't use implicit rules or variables
   5 # we have explicit rules for everything
   6 MAKEFLAGS += -rR
   7
   8 # Files with this suffixes are final, don't try to generate them
   9 # using implicit rules
  10 %/trace-events:
  11 %.hx:
  12 %.py:
  13 %.objs:
  14 %.d:
  15 %.h:
  16 %.c:
  17 %.cc:
  18 %.cpp:
  19 %.m:
  20 %.mak:
  21 clean-target:
  22
  23 # Flags for C++ compilation
  24 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))
  25
  26 # Flags for dependency generation
  27 QEMU_DGFLAGS += -MMD -MP -MT $@ -MF $(@D)/$(*F).d
  28
  29 # Same as -I$(SRC_PATH) -I., but for the nested source/object directories
  30 QEMU_INCLUDES += -I$(<D) -I$(@D)
  31
  32 WL_U := -Wl,-u,
  33 find-symbols = $(if $1, $(sort $(shell $(NM) -P -g $1 | $2)))
  34 defined-symbols = $(call find-symbols,$1,awk '$$2!="U"{print $$1}')
  35 undefined-symbols = $(call find-symbols,$1,awk '$$2=="U"{print $$1}')
  36
  37 # All the .mo objects in -m variables are also added into corresponding -y
  38 # variable in unnest-vars, but filtered out here, when LINK is called.
  39 #
  40 # The .mo objects are supposed to be linked as a DSO, for module build. So here
  41 # they are only used as a placeholders to generate those "archive undefined"
  42 # symbol options (-Wl,-u,$symbol_name), which are the archive functions
  43 # referenced by the code in the DSO.
  44 #
  45 # Also the presence in -y variables will also guarantee they are built before
  46 # linking executables that will load them. So we can look up symbol reference
  47 # in LINK.
  48 #
  49 # This is necessary because the exectuable itself may not use the function, in
  50 # which case the function would not be linked in. Then the DSO loading will
  51 # fail because of the missing symbol.
  52 process-archive-undefs = $(filter-out %.a %.mo,$1) \
  53                 $(addprefix $(WL_U), \
  54                      $(filter $(call defined-symbols,$(filter %.a, $1)), \
  55                               $(call undefined-symbols,$(filter %.mo,$1)))) \
  56                 $(filter %.a,$1)
  57
  58 extract-libs = $(strip $(foreach o,$(filter-out %.mo,$1),$($o-libs)))
  59 expand-objs = $(strip $(sort $(filter %.o,$1)) \
  60                   $(foreach o,$(filter %.mo,$1),$($o-objs)) \
  61                   $(filter-out %.o %.mo,$1))
  62
  63 %.o: %.c
  64         $(call quiet-command,$(CC) $(QEMU_INCLUDES) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) -c -o $@ $<,"CC","$(TARGET_DIR)$@")
  65 %.o: %.rc
  66         $(call quiet-command,$(WINDRES) -I. -o $@ $<,"RC","$(TARGET_DIR)$@")
  67
  68 # If we have a CXX we might have some C++ objects, in which case we
  69 # must link with the C++ compiler, not the plain C compiler.
  70 LINKPROG = $(or $(CXX),$(CC))
  71
  72 LINK = $(call quiet-command, $(LINKPROG) $(QEMU_CFLAGS) $(CFLAGS) $(LDFLAGS) -o $@ \
  73        $(call process-archive-undefs, $1) \
  74        $(version-obj-y) $(call extract-libs,$1) $(LIBS),"LINK","$(TARGET_DIR)$@")
  75
  76 %.o: %.S
  77         $(call quiet-command,$(CCAS) $(QEMU_INCLUDES) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) -c -o $@ $<,"CCAS","$(TARGET_DIR)$@")
  78
  79 %.o: %.cc
  80         $(call quiet-command,$(CXX) $(QEMU_INCLUDES) $(QEMU_CXXFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) -c -o $@ $<,"CXX","$(TARGET_DIR)$@")
  81
  82 %.o: %.cpp
  83         $(call quiet-command,$(CXX) $(QEMU_INCLUDES) $(QEMU_CXXFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) -c -o $@ $<,"CXX","$(TARGET_DIR)$@")
  84
  85 %.o: %.m
  86         $(call quiet-command,$(OBJCC) $(QEMU_INCLUDES) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) -c -o $@ $<,"OBJC","$(TARGET_DIR)$@")
  87
  88 %.o: %.dtrace
  89         $(call quiet-command,dtrace -o $@ -G -s $<,"GEN","$(TARGET_DIR)$@")
  90
  91 ifdef CONFIG_WIN32
  92 DSO_OBJ_CFLAGS := -DBUILD_DSO
  93 else
  94 DSO_OBJ_CFLAGS := -fPIC -DBUILD_DSO
  95 endif
  96 module-common.o: CFLAGS += $(DSO_OBJ_CFLAGS)
  97 %$(DSOSUF): LDFLAGS += $(LDFLAGS_SHARED)
  98 %$(DSOSUF): %.mo
  99         $(call LINK,$^)
 100         @# Copy to build root so modules can be loaded when program started without install
 101         $(if $(findstring /,$@),$(call quiet-command,cp $@ $(subst /,-,$@),"CP","$(subst /,-,$@)"))
 102
 103
 104 LD_REL := $(CC) -nostdlib $(LD_REL_FLAGS)
 105
 106 %.mo:
 107         $(call quiet-command,$(LD_REL) -o $@ $^,"LD","$(TARGET_DIR)$@")
 108
 109 .PHONY: modules
 110 modules:
 111
 112 %$(EXESUF): %.o
 113         $(call LINK,$(filter %.o %.a %.mo, $^))
 114
 115 %.a:
 116         $(call quiet-command,rm -f $@ && $(AR) rcs $@ $^,"AR","$(TARGET_DIR)$@")
 117
 118 # Usage: $(call quiet-command,command and args,"NAME","args to print")
 119 # This will run "command and args", and either:
 120 #  if V=1 just print the whole command and args
 121 #  otherwise print the 'quiet' output in the format "  NAME     args to print"
 122 # NAME should be a short name of the command, 7 letters or fewer.
 123 # If called with only a single argument, will print nothing in quiet mode.
 124 quiet-command = $(if $(V),$1,$(if $(2),@printf "  %-7s %s\n" $2 $3 && $1, @$1))
 125
 126 # cc-option
 127 # Usage: CFLAGS+=$(call cc-option, -falign-functions=0, -malign-functions=0)
 128
 129 cc-option = $(if $(shell $(CC) $1 $2 -S -o /dev/null -xc /dev/null \
 130               >/dev/null 2>&1 && echo OK), $2, $3)
 131 cc-c-option = $(if $(shell $(CC) $1 $2 -c -o /dev/null -xc /dev/null \
 132                 >/dev/null 2>&1 && echo OK), $2, $3)
 133
 134 VPATH_SUFFIXES = %.c %.h %.S %.cc %.cpp %.m %.mak %.texi %.sh %.rc
 135 set-vpath = $(if $1,$(foreach PATTERN,$(VPATH_SUFFIXES),$(eval vpath $(PATTERN) $1)))
 136
 137 # install-prog list, dir
 138 define install-prog
 139         $(INSTALL_DIR) "$2"
 140         $(INSTALL_PROG) $1 "$2"
 141         $(if $(STRIP),$(STRIP) $(foreach T,$1,"$2/$(notdir $T)"),)
 142 endef
 143
 144 # find-in-path
 145 # Usage: $(call find-in-path, prog)
 146 # Looks in the PATH if the argument contains no slash, else only considers one
 147 # specific directory.  Returns an # empty string if the program doesn't exist
 148 # there.
 149 find-in-path = $(if $(findstring /, $1), \
 150         $(wildcard $1), \
 151         $(wildcard $(patsubst %, %/$1, $(subst :, ,$(PATH)))))
 152
 153 # Logical functions (for operating on y/n values like CONFIG_FOO vars)
 154 # Inputs to these must be either "y" (true) or "n" or "" (both false)
 155 # Output is always either "y" or "n".
 156 # Usage: $(call land,$(CONFIG_FOO),$(CONFIG_BAR))
 157 # Logical NOT
 158 lnot = $(if $(subst n,,$1),n,y)
 159 # Logical AND
 160 land = $(if $(findstring yy,$1$2),y,n)
 161 # Logical OR
 162 lor = $(if $(findstring y,$1$2),y,n)
 163 # Logical XOR (note that this is the inverse of leqv)
 164 lxor = $(if $(filter $(call lnot,$1),$(call lnot,$2)),n,y)
 165 # Logical equivalence (note that leqv "","n" is true)
 166 leqv = $(if $(filter $(call lnot,$1),$(call lnot,$2)),y,n)
 167 # Logical if: like make's $(if) but with an leqv-like test
 168 lif = $(if $(subst n,,$1),$2,$3)
 169
 170 # String testing functions: inputs to these can be any string;
 171 # the output is always either "y" or "n". Leading and trailing whitespace
 172 # is ignored when comparing strings.
 173 # String equality
 174 eq = $(if $(subst $2,,$1)$(subst $1,,$2),n,y)
 175 # String inequality
 176 ne = $(if $(subst $2,,$1)$(subst $1,,$2),y,n)
 177 # Emptiness/non-emptiness tests:
 178 isempty = $(if $1,n,y)
 179 notempty = $(if $1,y,n)
 180
 181 # Generate files with tracetool
 182 TRACETOOL=$(PYTHON) $(SRC_PATH)/scripts/tracetool.py
 183
 184 # Generate timestamp files for .h include files
 185
 186 config-%.h: config-%.h-timestamp
 187         @cmp $< $@ >/dev/null 2>&1 || cp $< $@
 188
 189 config-%.h-timestamp: config-%.mak $(SRC_PATH)/scripts/create_config
 190         $(call quiet-command, sh $(SRC_PATH)/scripts/create_config < $< > $@,"GEN","$(TARGET_DIR)config-$*.h")
 191
 192 .PHONY: clean-timestamp
 193 clean-timestamp:
 194         rm -f *.timestamp
 195 clean: clean-timestamp
 196
 197 # will delete the target of a rule if commands exit with a nonzero exit status
 198 .DELETE_ON_ERROR:
 199
 200 # save-vars
 201 # Usage: $(call save-vars, vars)
 202 # Save each variable $v in $vars as save-vars-$v, save their object's
 203 # variables, then clear $v.  saved-vars-$v contains the variables that
 204 # where saved for the objects, in order to speedup load-vars.
 205 define save-vars
 206     $(foreach v,$1,
 207         $(eval save-vars-$v := $(value $v))
 208         $(eval saved-vars-$v := $(foreach o,$($v), \
 209             $(if $($o-cflags), $o-cflags $(eval save-vars-$o-cflags := $($o-cflags))$(eval $o-cflags := )) \
 210             $(if $($o-libs), $o-libs $(eval save-vars-$o-libs := $($o-libs))$(eval $o-libs := )) \
 211             $(if $($o-objs), $o-objs $(eval save-vars-$o-objs := $($o-objs))$(eval $o-objs := ))))
 212         $(eval $v := ))
 213 endef
 214
 215 # load-vars
 216 # Usage: $(call load-vars, vars, add_var)
 217 # Load the saved value for each variable in @vars, and the per object
 218 # variables.
 219 # Append @add_var's current value to the loaded value.
 220 define load-vars
 221     $(eval $2-new-value := $(value $2))
 222     $(foreach v,$1,
 223         $(eval $v := $(value save-vars-$v))
 224         $(foreach o,$(saved-vars-$v),
 225             $(eval $o := $(save-vars-$o)) $(eval save-vars-$o := ))
 226         $(eval save-vars-$v := )
 227         $(eval saved-vars-$v := ))
 228     $(eval $2 := $(value $2) $($2-new-value))
 229 endef
 230
 231 # fix-paths
 232 # Usage: $(call fix-paths, obj_path, src_path, vars)
 233 # Add prefix @obj_path to all objects in @vars, and add prefix @src_path to all
 234 # directories in @vars.
 235 define fix-paths
 236     $(foreach v,$3,
 237         $(foreach o,$($v),
 238             $(if $($o-libs),
 239                 $(eval $1$o-libs := $($o-libs)))
 240             $(if $($o-cflags),
 241                 $(eval $1$o-cflags := $($o-cflags)))
 242             $(if $($o-objs),
 243                 $(eval $1$o-objs := $(addprefix $1,$($o-objs)))))
 244         $(eval $v := $(addprefix $1,$(filter-out %/,$($v))) \
 245                      $(addprefix $2,$(filter %/,$($v)))))
 246 endef
 247
 248 # unnest-var-recursive
 249 # Usage: $(call unnest-var-recursive, obj_prefix, vars, var)
 250 #
 251 # Unnest @var by including subdir Makefile.objs, while protect others in @vars
 252 # unchanged.
 253 #
 254 # @obj_prefix is the starting point of object path prefix.
 255 #
 256 define unnest-var-recursive
 257     $(eval dirs := $(sort $(filter %/,$($3))))
 258     $(eval $3 := $(filter-out %/,$($3)))
 259     $(foreach d,$(dirs:%/=%),
 260             $(call save-vars,$2)
 261             $(eval obj := $(if $1,$1/)$d)
 262             $(eval -include $(SRC_PATH)/$d/Makefile.objs)
 263             $(call fix-paths,$(if $1,$1/)$d/,$d/,$2)
 264             $(call load-vars,$2,$3)
 265             $(call unnest-var-recursive,$1,$2,$3))
 266 endef
 267
 268 # unnest-vars
 269 # Usage: $(call unnest-vars, obj_prefix, vars)
 270 #
 271 # @obj_prefix: object path prefix, can be empty, or '..', etc. Don't include
 272 # ending '/'.
 273 #
 274 # @vars: the list of variable names to unnest.
 275 #
 276 # This macro will scan subdirectories's Makefile.objs, include them, to build
 277 # up each variable listed in @vars.
 278 #
 279 # Per object and per module cflags and libs are saved with relative path fixed
 280 # as well, those variables include -libs, -cflags and -objs. Items in -objs are
 281 # also fixed to relative path against SRC_PATH plus the prefix @obj_prefix.
 282 #
 283 # All nested variables postfixed by -m in names are treated as DSO variables,
 284 # and will be built as modules, if enabled.
 285 #
 286 # A simple example of the unnest:
 287 #
 288 #     obj_prefix = ..
 289 #     vars = hot cold
 290 #     hot  = fire.o sun.o season/
 291 #     cold = snow.o water/ season/
 292 #
 293 # Unnest through a faked source directory structure:
 294 #
 295 #     SRC_PATH
 296 #        ├── water
 297 #        │   └── Makefile.objs──────────────────┐
 298 #        │       │ hot += steam.o               │
 299 #        │       │ cold += ice.mo               │
 300 #        │       │ ice.mo-libs := -licemaker    │
 301 #        │       │ ice.mo-objs := ice1.o ice2.o │
 302 #        │       └──────────────────────────────┘
 303 #        │
 304 #        └── season
 305 #            └── Makefile.objs──────┐
 306 #                │ hot += summer.o  │
 307 #                │ cold += winter.o │
 308 #                └──────────────────┘
 309 #
 310 # In the end, the result will be:
 311 #
 312 #     hot  = ../fire.o ../sun.o ../season/summer.o
 313 #     cold = ../snow.o ../water/ice.mo ../season/winter.o
 314 #     ../water/ice.mo-libs = -licemaker
 315 #     ../water/ice.mo-objs = ../water/ice1.o ../water/ice2.o
 316 #
 317 # Note that 'hot' didn't include 'season/' in the input, so 'summer.o' is not
 318 # included.
 319 #
 320 define unnest-vars
 321     # In the case of target build (i.e. $1 == ..), fix path for top level
 322     # Makefile.objs objects
 323     $(if $1,$(call fix-paths,$1/,,$2))
 324
 325     # Descend and include every subdir Makefile.objs
 326     $(foreach v, $2,
 327         $(call unnest-var-recursive,$1,$2,$v)
 328         # Pass the .mo-cflags and .mo-libs along to its member objects
 329         $(foreach o, $(filter %.mo,$($v)),
 330             $(foreach p,$($o-objs),
 331                 $(if $($o-cflags), $(eval $p-cflags += $($o-cflags)))
 332                 $(if $($o-libs), $(eval $p-libs += $($o-libs))))))
 333
 334     # For all %.mo objects that are directly added into -y, just expand them
 335     $(foreach v,$(filter %-y,$2),
 336         $(eval $v := $(foreach o,$($v),$(if $($o-objs),$($o-objs),$o))))
 337
 338     $(foreach v,$(filter %-m,$2),
 339         # All .o found in *-m variables are single object modules, create .mo
 340         # for them
 341         $(foreach o,$(filter %.o,$($v)),
 342             $(eval $(o:%.o=%.mo)-objs := $o))
 343         # Now unify .o in -m variable to .mo
 344         $(eval $v := $($v:%.o=%.mo))
 345         $(eval modules-m += $($v))
 346
 347         # For module build, build shared libraries during "make modules"
 348         # For non-module build, add -m to -y
 349         $(if $(CONFIG_MODULES),
 350              $(foreach o,$($v),
 351                    $(eval $($o-objs): CFLAGS += $(DSO_OBJ_CFLAGS))
 352                    $(eval $o: $($o-objs)))
 353              $(eval $(patsubst %-m,%-y,$v) += $($v))
 354              $(eval modules: $($v:%.mo=%$(DSOSUF))),
 355              $(eval $(patsubst %-m,%-y,$v) += $(call expand-objs, $($v)))))
 356
 357     # Post-process all the unnested vars
 358     $(foreach v,$2,
 359         $(foreach o, $(filter %.mo,$($v)),
 360             # Find all the .mo objects in variables and add dependency rules
 361             # according to .mo-objs. Report error if not set
 362             $(if $($o-objs),
 363                 $(eval $(o:%.mo=%$(DSOSUF)): module-common.o $($o-objs)),
 364                 $(error $o added in $v but $o-objs is not set)))
 365         $(shell mkdir -p ./ $(sort $(dir $($v))))
 366         # Include all the .d files
 367         $(eval -include $(patsubst %.o,%.d,$(patsubst %.mo,%.d,$($v))))
 368         $(eval $v := $(filter-out %/,$($v))))
 369 endef