rules.mak

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