LXR qemu/rules.mak

   1
   2# Don't use implicit rules or variables
   3# we have explicit rules for everything
   4MAKEFLAGS += -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
  17QEMU_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
  20QEMU_DGFLAGS += -MMD -MP -MT $@ -MF $(@D)/$(*F).d
  21
  22# Same as -I$(SRC_PATH) -I., but for the nested source/object directories
  23QEMU_INCLUDES += -I$(<D) -I$(@D)
  24
  25WL_U := -Wl,-u,
  26find-symbols = $(if $1, $(sort $(shell $(NM) -P -g $1 | $2)))
  27defined-symbols = $(call find-symbols,$1,awk '$$2!="U"{print $$1}')
  28undefined-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.
  45process-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
  51extract-libs = $(strip $(foreach o,$1,$($o-libs)))
  52expand-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.
  63LINKPROG = $(or $(CXX),$(CC))
  64
  65LINK = $(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
  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 -Wl,-r
  97
  98%.mo:
  99        $(call quiet-command,$(LD_REL) -o $@ $^,"  LD -r $(TARGET_DIR)$@")
 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
 110quiet-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
 115cc-option = $(if $(shell $(CC) $1 $2 -S -o /dev/null -xc /dev/null \
 116              >/dev/null 2>&1 && echo OK), $2, $3)
 117
 118VPATH_SUFFIXES = %.c %.h %.S %.cc %.cpp %.m %.mak %.texi %.sh %.rc
 119set-vpath = $(if $1,$(foreach PATTERN,$(VPATH_SUFFIXES),$(eval vpath $(PATTERN) $1)))
 120
 121# install-prog list, dir
 122define install-prog
 123        $(INSTALL_DIR) "$2"
 124        $(INSTALL_PROG) $1 "$2"
 125        $(if $(STRIP),$(STRIP) $(foreach T,$1,"$2/$(notdir $T)"),)
 126endef
 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.
 133find-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
 142lnot = $(if $(subst n,,$1),n,y)
 143# Logical AND
 144land = $(if $(findstring yy,$1$2),y,n)
 145# Logical OR
 146lor = $(if $(findstring y,$1$2),y,n)
 147# Logical XOR (note that this is the inverse of leqv)
 148lxor = $(if $(filter $(call lnot,$1),$(call lnot,$2)),n,y)
 149# Logical equivalence (note that leqv "","n" is true)
 150leqv = $(if $(filter $(call lnot,$1),$(call lnot,$2)),y,n)
 151# Logical if: like make's $(if) but with an leqv-like test
 152lif = $(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
 158eq = $(if $(subst $2,,$1)$(subst $1,,$2),n,y)
 159# String inequality
 160ne = $(if $(subst $2,,$1)$(subst $1,,$2),y,n)
 161# Emptiness/non-emptiness tests:
 162isempty = $(if $1,n,y)
 163notempty = $(if $1,y,n)
 164
 165# Generate files with tracetool
 166TRACETOOL=$(PYTHON) $(SRC_PATH)/scripts/tracetool.py
 167
 168# Generate timestamp files for .h include files
 169
 170config-%.h: config-%.h-timestamp
 171        @cmp $< $@ >/dev/null 2>&1 || cp $< $@
 172
 173config-%.h-timestamp: config-%.mak
 174        $(call quiet-command, sh $(SRC_PATH)/scripts/create_config < $< > $@, "  GEN   $(TARGET_DIR)config-$*.h")
 175
 176.PHONY: clean-timestamp
 177clean-timestamp:
 178        rm -f *.timestamp
 179clean: 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.
 188define 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 := ))
 197endef
 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.
 204define 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))
 215endef
 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.
 221define 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)))))
 232endef
 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#
 242define 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))
 252endef
 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#
 306define 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))))
 355endef
 356