ifeq ("$(origin O)", "command line")	dummy := $(if $(shell test -d $(O) || echo $(O)),$(error O=$(O) does not exist),)	ABSOLUTE_O := $(shell cd $(O) ; pwd)	OUTPUT := $(ABSOLUTE_O)/	COMMAND_O := O=$(ABSOLUTE_O)endif ifneq ($(OUTPUT),)# check that the output directory actually existsOUTDIR := $(shell cd $(OUTPUT) && /bin/pwd)$(if $(OUTDIR),, $(error output directory "$(OUTPUT)" does not exist))endif ## Include saner warnings here, which can catch bugs:#EXTRA_WARNINGS := -Wbad-function-castEXTRA_WARNINGS += -Wdeclaration-after-statementEXTRA_WARNINGS += -Wformat-securityEXTRA_WARNINGS += -Wformat-y2kEXTRA_WARNINGS += -Winit-selfEXTRA_WARNINGS += -Wmissing-declarationsEXTRA_WARNINGS += -Wmissing-prototypesEXTRA_WARNINGS += -Wnested-externsEXTRA_WARNINGS += -Wno-system-headersEXTRA_WARNINGS += -Wold-style-definitionEXTRA_WARNINGS += -WpackedEXTRA_WARNINGS += -Wredundant-declsEXTRA_WARNINGS += -WshadowEXTRA_WARNINGS += -Wstrict-aliasing=3EXTRA_WARNINGS += -Wstrict-prototypesEXTRA_WARNINGS += -Wswitch-defaultEXTRA_WARNINGS += -Wswitch-enumEXTRA_WARNINGS += -WundefEXTRA_WARNINGS += -Wwrite-stringsEXTRA_WARNINGS += -Wformat ifneq ($(findstring $(MAKEFLAGS), w),w)PRINT_DIR = --no-print-directoryelseNO_SUBDIR = :endif QUIET_SUBDIR0  = +$(MAKE) -C # space to separate -C and subdirQUIET_SUBDIR1  = ifneq ($(findstring $(MAKEFLAGS),s),s)ifndef V	QUIET_CC       = @echo '   ' CC $@;	QUIET_AR       = @echo '   ' AR $@;	QUIET_LINK     = @echo '   ' LINK $@;	QUIET_MKDIR    = @echo '   ' MKDIR $@;	QUIET_GEN      = @echo '   ' GEN $@;	QUIET_SUBDIR0  = +@subdir=	QUIET_SUBDIR1  = ;$(NO_SUBDIR) echo '   ' SUBDIR $$subdir; \			 $(MAKE) $(PRINT_DIR) -C $$subdir	QUIET_FLEX     = @echo '   ' FLEX $@;	QUIET_BISON    = @echo '   ' BISON $@;endifendif