LXR qemu/rules.mak

   1
   2# These are used when we want to do substitutions without confusing Make
   3NULL  :=
   4SPACE := $(NULL) #
   5COMMA := ,
   6
   7# Don't use implicit rules or variables
   8# we have explicit rules for everything
   9MAKEFLAGS += -rR
  10
  11# Files with this suffixes are final, don't try to generate them
  12# using implicit rules
  13%/trace-events:
  14%.hx:
  15%.py:
  16%.objs:
  17%.d:
  18%.h:
  19%.c:
  20%.cc:
  21%.cpp:
  22%.m:
  23%.mak:
  24clean-target:
  25
  26# Flags for dependency generation
  27QEMU_DGFLAGS += -MMD -MP -MT $@ -MF $(@D)/$(*F).d
  28
  29# Compiler searches the source file dir first, but in vpath builds
  30# we need to make it search the build dir too, before any other
  31# explicit search paths. There are two search locations in the build
  32# dir, one absolute and the other relative to the compiler working
  33# directory. These are the same for target-independent files, but
  34# different for target-dependent ones.
  35QEMU_LOCAL_INCLUDES = -iquote $(BUILD_DIR)/$(@D) -iquote $(@D)
  36
  37WL_U := -Wl,-u,
  38find-symbols = $(if $1, $(sort $(shell $(NM) -P -g $1 | $2)))
  39defined-symbols = $(call find-symbols,$1,awk '$$2!="U"{print $$1}')
  40undefined-symbols = $(call find-symbols,$1,awk '$$2=="U"{print $$1}')
  41
  42# All the .mo objects in -m variables are also added into corresponding -y
  43# variable in unnest-vars, but filtered out here, when LINK is called.
  44#
  45# The .mo objects are supposed to be linked as a DSO, for module build. So here
  46# they are only used as a placeholders to generate those "archive undefined"
  47# symbol options (-Wl,-u,$symbol_name), which are the archive functions
  48# referenced by the code in the DSO.
  49#
  50# Also the presence in -y variables will also guarantee they are built before
  51# linking executables that will load them. So we can look up symbol reference
  52# in LINK.
  53#
  54# This is necessary because the exectuable itself may not use the function, in
  55# which case the function would not be linked in. Then the DSO loading will
  56# fail because of the missing symbol.
  57process-archive-undefs = $(filter-out %.a %.mo,$1) \
  58                $(addprefix $(WL_U), \
  59                     $(filter $(call defined-symbols,$(filter %.a, $1)), \
  60                              $(call undefined-symbols,$(filter %.mo,$1)))) \
  61                $(filter %.a,$1)
  62
  63extract-libs = $(strip $(foreach o,$(filter-out %.mo,$1),$($o-libs)))
  64expand-objs = $(strip $(sort $(filter %.o,$1)) \
  65                  $(foreach o,$(filter %.mo,$1),$($o-objs)) \
  66                  $(filter-out %.o %.mo,$1))
  67
  68%.o: %.c
  69        $(call quiet-command,$(CC) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \
  70               $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) \
  71               -c -o $@ $<,"CC","$(TARGET_DIR)$@")
  72%.o: %.rc
  73        $(call quiet-command,$(WINDRES) -I. -o $@ $<,"RC","$(TARGET_DIR)$@")
  74
  75# If we have a CXX we might have some C++ objects, in which case we
  76# must link with the C++ compiler, not the plain C compiler.
  77LINKPROG = $(or $(CXX),$(CC))
  78
  79LINK = $(call quiet-command, $(LINKPROG) $(QEMU_LDFLAGS) $(QEMU_CFLAGS) $(CFLAGS) $(LDFLAGS) -o $@ \
  80       $(call process-archive-undefs, $1) \
  81       $(version-obj-y) $(call extract-libs,$1) $(LIBS),"LINK","$(TARGET_DIR)$@")
  82
  83%.o: %.S
  84        $(call quiet-command,$(CCAS) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \
  85               $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) \
  86               -c -o $@ $<,"CCAS","$(TARGET_DIR)$@")
  87
  88%.o: %.cc
  89        $(call quiet-command,$(CXX) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \
  90               $(QEMU_CXXFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) \
  91               -c -o $@ $<,"CXX","$(TARGET_DIR)$@")
  92
  93%.o: %.cpp
  94        $(call quiet-command,$(CXX) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \
  95               $(QEMU_CXXFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) \
  96               -c -o $@ $<,"CXX","$(TARGET_DIR)$@")
  97
  98%.o: %.m
  99        $(call quiet-command,$(OBJCC) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \
 100               $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) \
 101               -c -o $@ $<,"OBJC","$(TARGET_DIR)$@")
 102
 103%.o: %.dtrace
 104        $(call quiet-command,dtrace -o $@ -G -s $<,"GEN","$(TARGET_DIR)$@")
 105
 106DSO_OBJ_CFLAGS := -fPIC -DBUILD_DSO
 107module-common.o: CFLAGS += $(DSO_OBJ_CFLAGS)
 108%$(DSOSUF): LDFLAGS += $(LDFLAGS_SHARED)
 109%$(DSOSUF): %.mo
 110        $(call LINK,$^)
 111        @# Copy to build root so modules can be loaded when program started without install
 112        $(if $(findstring /,$@),$(call quiet-command,cp $@ $(subst /,-,$@),"CP","$(subst /,-,$@)"))
 113
 114
 115LD_REL := $(CC) -nostdlib $(LD_REL_FLAGS)
 116
 117%.mo:
 118        $(call quiet-command,$(LD_REL) -o $@ $^,"LD","$(TARGET_DIR)$@")
 119
 120.PHONY: modules
 121modules:
 122
 123%$(EXESUF): %.o
 124        $(call LINK,$(filter %.o %.a %.mo, $^))
 125
 126%.a:
 127        $(call quiet-command,rm -f $@ && $(AR) rcs $@ $^,"AR","$(TARGET_DIR)$@")
 128
 129# Usage: $(call quiet-command,command and args,"NAME","args to print")
 130# This will run "command and args", and either:
 131#  if V=1 just print the whole command and args
 132#  otherwise print the 'quiet' output in the format "  NAME     args to print"
 133# NAME should be a short name of the command, 7 letters or fewer.
 134# If called with only a single argument, will print nothing in quiet mode.
 135quiet-command-run = $(if $(V),,$(if $2,printf "  %-7s %s\n" $2 $3 && ))$1
 136quiet-@ = $(if $(V),,@)
 137quiet-command = $(quiet-@)$(call quiet-command-run,$1,$2,$3)
 138
 139# cc-option
 140# Usage: CFLAGS+=$(call cc-option, -falign-functions=0, -malign-functions=0)
 141
 142cc-option = $(if $(shell $(CC) $1 $2 -S -o /dev/null -xc /dev/null \
 143              >/dev/null 2>&1 && echo OK), $2, $3)
 144cc-c-option = $(if $(shell $(CC) $1 $2 -c -o /dev/null -xc /dev/null \
 145                >/dev/null 2>&1 && echo OK), $2, $3)
 146
 147VPATH_SUFFIXES = %.c %.h %.S %.cc %.cpp %.m %.mak %.texi %.sh %.rc Kconfig%
 148set-vpath = $(if $1,$(foreach PATTERN,$(VPATH_SUFFIXES),$(eval vpath $(PATTERN) $1)))
 149
 150# install-prog list, dir
 151define install-prog
 152        $(INSTALL_DIR) "$2"
 153        $(INSTALL_PROG) $1 "$2"
 154        $(if $(STRIP),$(STRIP) $(foreach T,$1,"$2/$(notdir $T)"),)
 155endef
 156
 157# find-in-path
 158# Usage: $(call find-in-path, prog)
 159# Looks in the PATH if the argument contains no slash, else only considers one
 160# specific directory.  Returns an # empty string if the program doesn't exist
 161# there.
 162find-in-path = $(if $(findstring /, $1), \
 163        $(wildcard $1), \
 164        $(wildcard $(patsubst %, %/$1, $(subst :, ,$(PATH)))))
 165
 166# Logical functions (for operating on y/n values like CONFIG_FOO vars)
 167# Inputs to these must be either "y" (true) or "n" or "" (both false)
 168# Output is always either "y" or "n".
 169# Usage: $(call land,$(CONFIG_FOO),$(CONFIG_BAR))
 170# Logical NOT
 171lnot = $(if $(subst n,,$1),n,y)
 172# Logical AND
 173land = $(if $(findstring yy,$1$2),y,n)
 174# Logical OR
 175lor = $(if $(findstring y,$1$2),y,n)
 176# Logical XOR (note that this is the inverse of leqv)
 177lxor = $(if $(filter $(call lnot,$1),$(call lnot,$2)),n,y)
 178# Logical equivalence (note that leqv "","n" is true)
 179leqv = $(if $(filter $(call lnot,$1),$(call lnot,$2)),y,n)
 180# Logical if: like make's $(if) but with an leqv-like test
 181lif = $(if $(subst n,,$1),$2,$3)
 182
 183# String testing functions: inputs to these can be any string;
 184# the output is always either "y" or "n". Leading and trailing whitespace
 185# is ignored when comparing strings.
 186# String equality
 187eq = $(if $(subst $2,,$1)$(subst $1,,$2),n,y)
 188# String inequality
 189ne = $(if $(subst $2,,$1)$(subst $1,,$2),y,n)
 190# Emptiness/non-emptiness tests:
 191isempty = $(if $1,n,y)
 192notempty = $(if $1,y,n)
 193
 194# Generate files with tracetool
 195TRACETOOL=$(PYTHON) $(SRC_PATH)/scripts/tracetool.py
 196
 197# Generate timestamp files for .h include files
 198
 199config-%.h: config-%.h-timestamp
 200        @cmp $< $@ >/dev/null 2>&1 || cp $< $@
 201
 202config-%.h-timestamp: config-%.mak $(SRC_PATH)/scripts/create_config
 203        $(call quiet-command, sh $(SRC_PATH)/scripts/create_config < $< > $@,"GEN","$(TARGET_DIR)config-$*.h")
 204
 205.PHONY: clean-timestamp
 206clean-timestamp:
 207        rm -f *.timestamp
 208clean: clean-timestamp
 209
 210# will delete the target of a rule if commands exit with a nonzero exit status
 211.DELETE_ON_ERROR:
 212
 213# save-vars
 214# Usage: $(call save-vars, vars)
 215# Save each variable $v in $vars as save-vars-$v, save their object's
 216# variables, then clear $v.  saved-vars-$v contains the variables that
 217# where saved for the objects, in order to speedup load-vars.
 218define save-vars
 219    $(foreach v,$1,
 220        $(eval save-vars-$v := $(value $v))
 221        $(eval saved-vars-$v := $(foreach o,$($v), \
 222            $(if $($o-cflags), $o-cflags $(eval save-vars-$o-cflags := $($o-cflags))$(eval $o-cflags := )) \
 223            $(if $($o-libs), $o-libs $(eval save-vars-$o-libs := $($o-libs))$(eval $o-libs := )) \
 224            $(if $($o-objs), $o-objs $(eval save-vars-$o-objs := $($o-objs))$(eval $o-objs := ))))
 225        $(eval $v := ))
 226endef
 227
 228# load-vars
 229# Usage: $(call load-vars, vars, add_var)
 230# Load the saved value for each variable in @vars, and the per object
 231# variables.
 232# Append @add_var's current value to the loaded value.
 233define load-vars
 234    $(eval $2-new-value := $(value $2))
 235    $(foreach v,$1,
 236        $(eval $v := $(value save-vars-$v))
 237        $(foreach o,$(saved-vars-$v),
 238            $(eval $o := $(save-vars-$o)) $(eval save-vars-$o := ))
 239        $(eval save-vars-$v := )
 240        $(eval saved-vars-$v := ))
 241    $(eval $2 := $(value $2) $($2-new-value))
 242endef
 243
 244# fix-paths
 245# Usage: $(call fix-paths, obj_path, src_path, vars)
 246# Add prefix @obj_path to all objects in @vars, and add prefix @src_path to all
 247# directories in @vars.
 248define fix-paths
 249    $(foreach v,$3,
 250        $(foreach o,$($v),
 251            $(if $($o-libs),
 252                $(eval $1$o-libs := $($o-libs)))
 253            $(if $($o-cflags),
 254                $(eval $1$o-cflags := $($o-cflags)))
 255            $(if $($o-objs),
 256                $(eval $1$o-objs := $(addprefix $1,$($o-objs)))))
 257        $(eval $v := $(addprefix $1,$(filter-out %/,$($v))) \
 258                     $(addprefix $2,$(filter %/,$($v)))))
 259endef
 260
 261# unnest-var-recursive
 262# Usage: $(call unnest-var-recursive, obj_prefix, vars, var)
 263#
 264# Unnest @var by including subdir Makefile.objs, while protect others in @vars
 265# unchanged.
 266#
 267# @obj_prefix is the starting point of object path prefix.
 268#
 269define unnest-var-recursive
 270    $(eval dirs := $(sort $(filter %/,$($3))))
 271    $(eval $3 := $(filter-out %/,$($3)))
 272    $(foreach d,$(dirs:%/=%),
 273            $(call save-vars,$2)
 274            $(eval obj := $(if $1,$1/)$d)
 275            $(eval -include $(SRC_PATH)/$d/Makefile.objs)
 276            $(call fix-paths,$(if $1,$1/)$d/,$d/,$2)
 277            $(call load-vars,$2,$3)
 278            $(call unnest-var-recursive,$1,$2,$3))
 279endef
 280
 281# unnest-vars
 282# Usage: $(call unnest-vars, obj_prefix, vars)
 283#
 284# @obj_prefix: object path prefix, can be empty, or '..', etc. Don't include
 285# ending '/'.
 286#
 287# @vars: the list of variable names to unnest.
 288#
 289# This macro will scan subdirectories's Makefile.objs, include them, to build
 290# up each variable listed in @vars.
 291#
 292# Per object and per module cflags and libs are saved with relative path fixed
 293# as well, those variables include -libs, -cflags and -objs. Items in -objs are
 294# also fixed to relative path against SRC_PATH plus the prefix @obj_prefix.
 295#
 296# All nested variables postfixed by -m in names are treated as DSO variables,
 297# and will be built as modules, if enabled.
 298#
 299# A simple example of the unnest:
 300#
 301#     obj_prefix = ..
 302#     vars = hot cold
 303#     hot  = fire.o sun.o season/
 304#     cold = snow.o water/ season/
 305#
 306# Unnest through a faked source directory structure:
 307#
 308#     SRC_PATH
 309#        ├── water
 310#        │   └── Makefile.objs──────────────────┐
 311#        │       │ hot += steam.o               │
 312#        │       │ cold += ice.mo               │
 313#        │       │ ice.mo-libs := -licemaker    │
 314#        │       │ ice.mo-objs := ice1.o ice2.o │
 315#        │       └──────────────────────────────┘
 316#        │
 317#        └── season
 318#            └── Makefile.objs──────┐
 319#                │ hot += summer.o  │
 320#                │ cold += winter.o │
 321#                └──────────────────┘
 322#
 323# In the end, the result will be:
 324#
 325#     hot  = ../fire.o ../sun.o ../season/summer.o
 326#     cold = ../snow.o ../water/ice.mo ../season/winter.o
 327#     ../water/ice.mo-libs = -licemaker
 328#     ../water/ice.mo-objs = ../water/ice1.o ../water/ice2.o
 329#
 330# Note that 'hot' didn't include 'water/' in the input, so 'steam.o' is not
 331# included.
 332#
 333define unnest-vars
 334    # In the case of target build (i.e. $1 == ..), fix path for top level
 335    # Makefile.objs objects
 336    $(if $1,$(call fix-paths,$1/,,$2))
 337
 338    # Descend and include every subdir Makefile.objs
 339    $(foreach v, $2,
 340        $(call unnest-var-recursive,$1,$2,$v)
 341        # Pass the .mo-cflags and .mo-libs along to its member objects
 342        $(foreach o, $(filter %.mo,$($v)),
 343            $(foreach p,$($o-objs),
 344                $(if $($o-cflags), $(eval $p-cflags += $($o-cflags)))
 345                $(if $($o-libs), $(eval $p-libs += $($o-libs))))))
 346
 347    # For all %.mo objects that are directly added into -y, just expand them
 348    $(foreach v,$(filter %-y,$2),
 349        $(eval $v := $(foreach o,$($v),$(if $($o-objs),$($o-objs),$o))))
 350
 351    $(foreach v,$(filter %-m,$2),
 352        # All .o found in *-m variables are single object modules, create .mo
 353        # for them
 354        $(foreach o,$(filter %.o,$($v)),
 355            $(eval $(o:%.o=%.mo)-objs := $o))
 356        # Now unify .o in -m variable to .mo
 357        $(eval $v := $($v:%.o=%.mo))
 358        $(eval modules-m += $($v))
 359
 360        # For module build, build shared libraries during "make modules"
 361        # For non-module build, add -m to -y
 362        $(if $(CONFIG_MODULES),
 363             $(foreach o,$($v),
 364                   $(eval $($o-objs): CFLAGS += $(DSO_OBJ_CFLAGS))
 365                   $(eval $o: $($o-objs)))
 366             $(eval $(patsubst %-m,%-y,$v) += $($v))
 367             $(eval modules: $($v:%.mo=%$(DSOSUF))),
 368             $(eval $(patsubst %-m,%-y,$v) += $(call expand-objs, $($v)))))
 369
 370    # Post-process all the unnested vars
 371    $(foreach v,$2,
 372        $(foreach o, $(filter %.mo,$($v)),
 373            # Find all the .mo objects in variables and add dependency rules
 374            # according to .mo-objs. Report error if not set
 375            $(if $($o-objs),
 376                $(eval $(o:%.mo=%$(DSOSUF)): module-common.o $($o-objs)),
 377                $(error $o added in $v but $o-objs is not set)))
 378        $(shell mkdir -p ./ $(sort $(dir $($v))))
 379        # Include all the .d files
 380        $(eval -include $(patsubst %.o,%.d,$(patsubst %.mo,%.d,$($v))))
 381        $(eval $v := $(filter-out %/,$($v))))
 382endef
 383
 384TEXI2MAN = $(call quiet-command, \
 385        perl -Ww -- $(SRC_PATH)/scripts/texi2pod.pl $(TEXI2PODFLAGS) $< $@.pod && \
 386        $(POD2MAN) --section=$(subst .,,$(suffix $@)) --center=" " --release=" " $@.pod > $@, \
 387        "GEN","$@")
 388
 389%.1:
 390        $(call TEXI2MAN)
 391%.7:
 392        $(call TEXI2MAN)
 393%.8:
 394        $(call TEXI2MAN)
 395