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