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