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