e05804eebc
This adds the 'magic' rules that take care of subdirectories. The subdirectory makefiles in the source tree are not complete; they only define some variables (listed in nested-vars) according to the configuration. The magic rules descend into subdirectory makefiles and gather the evaluated values of those variables. The values from all subdirectories are joined together, each prefixed with the subdirectory name, and used by the "real" makefiles. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
115 lines
3.4 KiB
Makefile
115 lines
3.4 KiB
Makefile
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# Don't use implicit rules or variables
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# we have explicit rules for everything
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MAKEFLAGS += -rR
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# Files with this suffixes are final, don't try to generate them
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# using implicit rules
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%.d:
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%.h:
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%.c:
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%.m:
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%.mak:
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# Flags for dependency generation
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QEMU_DGFLAGS += -MMD -MP -MT $@ -MF $(*D)/$(*F).d
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%.o: %.c
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$(call quiet-command,$(CC) $(QEMU_INCLUDES) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) -c -o $@ $<," CC $(TARGET_DIR)$@")
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ifeq ($(LIBTOOL),)
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%.lo: %.c
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@echo "missing libtool. please install and rerun configure"; exit 1
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else
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%.lo: %.c
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$(call quiet-command,$(LIBTOOL) --mode=compile --quiet --tag=CC $(CC) $(QEMU_INCLUDES) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) -c -o $@ $<," lt CC $@")
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endif
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%.o: %.S
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$(call quiet-command,$(CC) $(QEMU_INCLUDES) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) -c -o $@ $<," AS $(TARGET_DIR)$@")
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%.o: %.m
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$(call quiet-command,$(CC) $(QEMU_INCLUDES) $(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) -c -o $@ $<," OBJC $(TARGET_DIR)$@")
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LINK = $(call quiet-command,$(CC) $(QEMU_CFLAGS) $(CFLAGS) $(LDFLAGS) -o $@ $(sort $(1)) $(LIBS)," LINK $(TARGET_DIR)$@")
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%$(EXESUF): %.o
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$(call LINK,$^)
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%.a:
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$(call quiet-command,rm -f $@ && $(AR) rcs $@ $^," AR $(TARGET_DIR)$@")
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quiet-command = $(if $(V),$1,$(if $(2),@echo $2 && $1, @$1))
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# cc-option
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# Usage: CFLAGS+=$(call cc-option, -falign-functions=0, -malign-functions=0)
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cc-option = $(if $(shell $(CC) $1 $2 -S -o /dev/null -xc /dev/null \
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>/dev/null 2>&1 && echo OK), $2, $3)
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VPATH_SUFFIXES = %.c %.h %.S %.m %.mak %.texi %.sh
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set-vpath = $(if $1,$(foreach PATTERN,$(VPATH_SUFFIXES),$(eval vpath $(PATTERN) $1)))
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# find-in-path
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# Usage: $(call find-in-path, prog)
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# Looks in the PATH if the argument contains no slash, else only considers one
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# specific directory. Returns an # empty string if the program doesn't exist
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# there.
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find-in-path = $(if $(find-string /, $1), \
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$(wildcard $1), \
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$(wildcard $(patsubst %, %/$1, $(subst :, ,$(PATH)))))
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# Generate files with tracetool
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TRACETOOL=$(PYTHON) $(SRC_PATH)/scripts/tracetool.py
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# Generate timestamp files for .h include files
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%.h: %.h-timestamp
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@test -f $@ || cp $< $@
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%.h-timestamp: %.mak
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$(call quiet-command, sh $(SRC_PATH)/scripts/create_config < $< > $@, " GEN $*.h")
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@cmp $@ $*.h >/dev/null 2>&1 || cp $@ $*.h
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# will delete the target of a rule if commands exit with a nonzero exit status
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.DELETE_ON_ERROR:
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# magic to descend into other directories
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obj := .
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old-nested-dirs :=
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define push-var
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$(eval save-$2-$1 = $(value $1))
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$(eval $1 :=)
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endef
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define pop-var
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$(eval subdir-$2-$1 := $(if $(filter $2,$(save-$2-$1)),$(addprefix $2,$($1))))
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$(eval $1 = $(value save-$2-$1) $$(subdir-$2-$1))
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$(eval save-$2-$1 :=)
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endef
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define unnest-dir
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$(foreach var,$(nested-vars),$(call push-var,$(var),$1/))
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$(eval obj := $(obj)/$1)
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$(eval include $(SRC_PATH)/$1/Makefile.objs)
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$(eval obj := $(patsubst %/$1,%,$(obj)))
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$(foreach var,$(nested-vars),$(call pop-var,$(var),$1/))
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endef
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define unnest-vars-1
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$(eval nested-dirs := $(filter-out \
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$(old-nested-dirs), \
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$(sort $(foreach var,$(nested-vars), $(filter %/, $($(var)))))))
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$(if $(nested-dirs),
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$(foreach dir,$(nested-dirs),$(call unnest-dir,$(patsubst %/,%,$(dir))))
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$(eval old-nested-dirs := $(old-nested-dirs) $(nested-dirs))
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$(call unnest-vars-1))
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endef
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define unnest-vars
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$(call unnest-vars-1)
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$(foreach var,$(nested-vars),$(eval $(var) := $(filter-out %/, $($(var)))))
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endef
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