LXR qemu/rules.mak

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