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