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