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e2a99ad3e1
Avoid duplicate object files during the link. There are legitimate cases where a link command-line would include duplicate object files because two independent subsystems both depend on common infrastructure. Use GNU make's $(sort) function to remove duplicate object files from the link command-line. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
73 lines
2.3 KiB
Makefile
73 lines
2.3 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
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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 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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