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