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 LINK = $(call quiet-command, $(LINKPROG) $(QEMU_CFLAGS) $(CFLAGS) $(LDFLAGS) -o $@ \
  66        $(call process-archive-undefs, $1) \
  67        $(version-obj-y) $(call extract-libs,$1) $(LIBS),"  LINK  $(TARGET_DIR)$@")
  68
  69 %.asm: %.S
  70         $(call quiet-command,$(CPP) $(QEMU_INCLUDES) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) -o $@ $<,"  CPP   $(TARGET_DIR)$@")
  71
  72 %.o: %.asm
  73         $(call quiet-command,$(AS) $(ASFLAGS) -o $@ $<,"  AS    $(TARGET_DIR)$@")
  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
  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         $(call LINK,$^)
 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
 118 VPATH_SUFFIXES = %.c %.h %.S %.cc %.cpp %.m %.mak %.texi %.sh %.rc
 119 set-vpath = $(if $1,$(foreach PATTERN,$(VPATH_SUFFIXES),$(eval vpath $(PATTERN) $1)))
 120
 121 # install-prog list, dir
 122 define install-prog
 123         $(INSTALL_DIR) "$2"
 124         $(INSTALL_PROG) $1 "$2"
 125         $(if $(STRIP),$(STRIP) $(foreach T,$1,"$2/$(notdir $T)"),)
 126 endef
 127
 128 # find-in-path
 129 # Usage: $(call find-in-path, prog)
 130 # Looks in the PATH if the argument contains no slash, else only considers one
 131 # specific directory.  Returns an # empty string if the program doesn't exist
 132 # there.
 133 find-in-path = $(if $(find-string /, $1), \
 134         $(wildcard $1), \
 135         $(wildcard $(patsubst %, %/$1, $(subst :, ,$(PATH)))))
 136
 137 # Logical functions (for operating on y/n values like CONFIG_FOO vars)
 138 # Inputs to these must be either "y" (true) or "n" or "" (both false)
 139 # Output is always either "y" or "n".
 140 # Usage: $(call land,$(CONFIG_FOO),$(CONFIG_BAR))
 141 # Logical NOT
 142 lnot = $(if $(subst n,,$1),n,y)
 143 # Logical AND
 144 land = $(if $(findstring yy,$1$2),y,n)
 145 # Logical OR
 146 lor = $(if $(findstring y,$1$2),y,n)
 147 # Logical XOR (note that this is the inverse of leqv)
 148 lxor = $(if $(filter $(call lnot,$1),$(call lnot,$2)),n,y)
 149 # Logical equivalence (note that leqv "","n" is true)
 150 leqv = $(if $(filter $(call lnot,$1),$(call lnot,$2)),y,n)
 151 # Logical if: like make's $(if) but with an leqv-like test
 152 lif = $(if $(subst n,,$1),$2,$3)
 153
 154 # String testing functions: inputs to these can be any string;
 155 # the output is always either "y" or "n". Leading and trailing whitespace
 156 # is ignored when comparing strings.
 157 # String equality
 158 eq = $(if $(subst $2,,$1)$(subst $1,,$2),n,y)
 159 # String inequality
 160 ne = $(if $(subst $2,,$1)$(subst $1,,$2),y,n)
 161 # Emptiness/non-emptiness tests:
 162 isempty = $(if $1,n,y)
 163 notempty = $(if $1,y,n)
 164
 165 # Generate files with tracetool
 166 TRACETOOL=$(PYTHON) $(SRC_PATH)/scripts/tracetool.py
 167
 168 # Generate timestamp files for .h include files
 169
 170 config-%.h: config-%.h-timestamp
 171         @cmp $< $@ >/dev/null 2>&1 || cp $< $@
 172
 173 config-%.h-timestamp: config-%.mak
 174         $(call quiet-command, sh $(SRC_PATH)/scripts/create_config < $< > $@, "  GEN   $(TARGET_DIR)config-$*.h")
 175
 176 .PHONY: clean-timestamp
 177 clean-timestamp:
 178         rm -f *.timestamp
 179 clean: clean-timestamp
 180
 181 # will delete the target of a rule if commands exit with a nonzero exit status
 182 .DELETE_ON_ERROR:
 183
 184 # save-vars
 185 # Usage: $(call save-vars, vars)
 186 # Save each variable $v in $vars as save-vars-$v, save their object's
 187 # variables, then clear $v.
 188 define save-vars
 189     $(foreach v,$1,
 190         $(eval save-vars-$v := $(value $v))
 191         $(foreach o,$($v),
 192             $(foreach k,cflags libs objs,
 193                 $(if $($o-$k),
 194                     $(eval save-vars-$o-$k := $($o-$k))
 195                     $(eval $o-$k := ))))
 196         $(eval $v := ))
 197 endef
 198
 199 # load-vars
 200 # Usage: $(call load-vars, vars, add_var)
 201 # Load the saved value for each variable in @vars, and the per object
 202 # variables.
 203 # Append @add_var's current value to the loaded value.
 204 define load-vars
 205     $(eval $2-new-value := $(value $2))
 206     $(foreach v,$1,
 207         $(eval $v := $(value save-vars-$v))
 208         $(foreach o,$($v),
 209             $(foreach k,cflags libs objs,
 210                 $(if $(save-vars-$o-$k),
 211                     $(eval $o-$k := $(save-vars-$o-$k))
 212                     $(eval save-vars-$o-$k := ))))
 213         $(eval save-vars-$v := ))
 214     $(eval $2 := $(value $2) $($2-new-value))
 215 endef
 216
 217 # fix-paths
 218 # Usage: $(call fix-paths, obj_path, src_path, vars)
 219 # Add prefix @obj_path to all objects in @vars, and add prefix @src_path to all
 220 # directories in @vars.
 221 define fix-paths
 222     $(foreach v,$3,
 223         $(foreach o,$($v),
 224             $(if $($o-libs),
 225                 $(eval $1$o-libs := $($o-libs)))
 226             $(if $($o-cflags),
 227                 $(eval $1$o-cflags := $($o-cflags)))
 228             $(if $($o-objs),
 229                 $(eval $1$o-objs := $(addprefix $1,$($o-objs)))))
 230         $(eval $v := $(addprefix $1,$(filter-out %/,$($v))) \
 231                      $(addprefix $2,$(filter %/,$($v)))))
 232 endef
 233
 234 # unnest-var-recursive
 235 # Usage: $(call unnest-var-recursive, obj_prefix, vars, var)
 236 #
 237 # Unnest @var by including subdir Makefile.objs, while protect others in @vars
 238 # unchanged.
 239 #
 240 # @obj_prefix is the starting point of object path prefix.
 241 #
 242 define unnest-var-recursive
 243     $(eval dirs := $(sort $(filter %/,$($3))))
 244     $(eval $3 := $(filter-out %/,$($3)))
 245     $(foreach d,$(dirs:%/=%),
 246             $(call save-vars,$2)
 247             $(eval obj := $(if $1,$1/)$d)
 248             $(eval -include $(SRC_PATH)/$d/Makefile.objs)
 249             $(call fix-paths,$(if $1,$1/)$d/,$d/,$2)
 250             $(call load-vars,$2,$3)
 251             $(call unnest-var-recursive,$1,$2,$3))
 252 endef
 253
 254 # unnest-vars
 255 # Usage: $(call unnest-vars, obj_prefix, vars)
 256 #
 257 # @obj_prefix: object path prefix, can be empty, or '..', etc. Don't include
 258 # ending '/'.
 259 #
 260 # @vars: the list of variable names to unnest.
 261 #
 262 # This macro will scan subdirectories's Makefile.objs, include them, to build
 263 # up each variable listed in @vars.
 264 #
 265 # Per object and per module cflags and libs are saved with relative path fixed
 266 # as well, those variables include -libs, -cflags and -objs. Items in -objs are
 267 # also fixed to relative path against SRC_PATH plus the prefix @obj_prefix.
 268 #
 269 # All nested variables postfixed by -m in names are treated as DSO variables,
 270 # and will be built as modules, if enabled.
 271 #
 272 # A simple example of the unnest:
 273 #
 274 #     obj_prefix = ..
 275 #     vars = hot cold
 276 #     hot  = fire.o sun.o season/
 277 #     cold = snow.o water/ season/
 278 #
 279 # Unnest through a faked source directory structure:
 280 #
 281 #     SRC_PATH
 282 #        ├── water
 283 #        │   └── Makefile.objs──────────────────┐
 284 #        │       │ hot += steam.o               │
 285 #        │       │ cold += ice.mo               │
 286 #        │       │ ice.mo-libs := -licemaker    │
 287 #        │       │ ice.mo-objs := ice1.o ice2.o │
 288 #        │       └──────────────────────────────┘
 289 #        │
 290 #        └── season
 291 #            └── Makefile.objs──────┐
 292 #                │ hot += summer.o  │
 293 #                │ cold += winter.o │
 294 #                └──────────────────┘
 295 #
 296 # In the end, the result will be:
 297 #
 298 #     hot  = ../fire.o ../sun.o ../season/summer.o
 299 #     cold = ../snow.o ../water/ice.mo ../season/winter.o
 300 #     ../water/ice.mo-libs = -licemaker
 301 #     ../water/ice.mo-objs = ../water/ice1.o ../water/ice2.o
 302 #
 303 # Note that 'hot' didn't include 'season/' in the input, so 'summer.o' is not
 304 # included.
 305 #
 306 define unnest-vars
 307     # In the case of target build (i.e. $1 == ..), fix path for top level
 308     # Makefile.objs objects
 309     $(if $1,$(call fix-paths,$1/,,$2))
 310
 311     # Descend and include every subdir Makefile.objs
 312     $(foreach v, $2,
 313         $(call unnest-var-recursive,$1,$2,$v)
 314         # Pass the .mo-cflags and .mo-libs along to its member objects
 315         $(foreach o, $(filter %.mo,$($v)),
 316             $(foreach p,$($o-objs),
 317                 $(if $($o-cflags), $(eval $p-cflags += $($o-cflags)))
 318                 $(if $($o-libs), $(eval $p-libs += $($o-libs))))))
 319
 320     # For all %.mo objects that are directly added into -y, just expand them
 321     $(foreach v,$(filter %-y,$2),
 322         $(eval $v := $(foreach o,$($v),$(if $($o-objs),$($o-objs),$o))))
 323
 324     $(foreach v,$(filter %-m,$2),
 325         # All .o found in *-m variables are single object modules, create .mo
 326         # for them
 327         $(foreach o,$(filter %.o,$($v)),
 328             $(eval $(o:%.o=%.mo)-objs := $o))
 329         # Now unify .o in -m variable to .mo
 330         $(eval $v := $($v:%.o=%.mo))
 331         $(eval modules-m += $($v))
 332
 333         # For module build, build shared libraries during "make modules"
 334         # For non-module build, add -m to -y
 335         $(if $(CONFIG_MODULES),
 336              $(foreach o,$($v),
 337                    $(eval $($o-objs): CFLAGS += $(DSO_OBJ_CFLAGS))
 338                    $(eval $o: $($o-objs)))
 339              $(eval $(patsubst %-m,%-y,$v) += $($v))
 340              $(eval modules: $($v:%.mo=%$(DSOSUF))),
 341              $(eval $(patsubst %-m,%-y,$v) += $(call expand-objs, $($v)))))
 342
 343     # Post-process all the unnested vars
 344     $(foreach v,$2,
 345         $(foreach o, $(filter %.mo,$($v)),
 346             # Find all the .mo objects in variables and add dependency rules
 347             # according to .mo-objs. Report error if not set
 348             $(if $($o-objs),
 349                 $(eval $(o:%.mo=%$(DSOSUF)): module-common.o $($o-objs)),
 350                 $(error $o added in $v but $o-objs is not set)))
 351         $(shell mkdir -p ./ $(sort $(dir $($v))))
 352         # Include all the .d files
 353         $(eval -include $(patsubst %.o,%.d,$(patsubst %.mo,%.d,$($v))))
 354         $(eval $v := $(filter-out %/,$($v))))
 355 endef