1ifneq ($(O),) 2ifeq ($(origin O), command line) 3 dummy := $(if $(shell test -d $(O) || echo $(O)),$(error O=$(O) does not exist),) 4 ABSOLUTE_O := $(shell cd $(O) ; pwd) 5 OUTPUT := $(ABSOLUTE_O)/$(if $(subdir),$(subdir)/) 6 COMMAND_O := O=$(ABSOLUTE_O) 7ifeq ($(objtree),) 8 objtree := $(O) 9endif 10endif 11endif 12 13# check that the output directory actually exists 14ifneq ($(OUTPUT),) 15OUTDIR := $(shell cd $(OUTPUT) && /bin/pwd) 16$(if $(OUTDIR),, $(error output directory "$(OUTPUT)" does not exist)) 17endif 18 19# 20# Include saner warnings here, which can catch bugs: 21# 22EXTRA_WARNINGS := -Wbad-function-cast 23EXTRA_WARNINGS += -Wdeclaration-after-statement 24EXTRA_WARNINGS += -Wformat-security 25EXTRA_WARNINGS += -Wformat-y2k 26EXTRA_WARNINGS += -Winit-self 27EXTRA_WARNINGS += -Wmissing-declarations 28EXTRA_WARNINGS += -Wmissing-prototypes 29EXTRA_WARNINGS += -Wnested-externs 30EXTRA_WARNINGS += -Wno-system-headers 31EXTRA_WARNINGS += -Wold-style-definition 32EXTRA_WARNINGS += -Wpacked 33EXTRA_WARNINGS += -Wredundant-decls 34EXTRA_WARNINGS += -Wshadow 35EXTRA_WARNINGS += -Wstrict-aliasing=3 36EXTRA_WARNINGS += -Wstrict-prototypes 37EXTRA_WARNINGS += -Wswitch-default 38EXTRA_WARNINGS += -Wswitch-enum 39EXTRA_WARNINGS += -Wundef 40EXTRA_WARNINGS += -Wwrite-strings 41EXTRA_WARNINGS += -Wformat 42 43ifneq ($(findstring $(MAKEFLAGS), w),w) 44PRINT_DIR = --no-print-directory 45else 46NO_SUBDIR = : 47endif 48 49# 50# Define a callable command for descending to a new directory 51# 52# Call by doing: $(call descend,directory[,target]) 53# 54descend = \ 55 +mkdir -p $(OUTPUT)$(1) && \ 56 $(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2) 57 58QUIET_SUBDIR0 = +$(MAKE) $(COMMAND_O) -C # space to separate -C and subdir 59QUIET_SUBDIR1 = 60 61ifneq ($(findstring $(MAKEFLAGS),s),s) 62ifneq ($(V),1) 63 QUIET_CC = @echo ' ' CC $@; 64 QUIET_AR = @echo ' ' AR $@; 65 QUIET_LINK = @echo ' ' LINK $@; 66 QUIET_MKDIR = @echo ' ' MKDIR $@; 67 QUIET_GEN = @echo ' ' GEN $@; 68 QUIET_SUBDIR0 = +@subdir= 69 QUIET_SUBDIR1 = ;$(NO_SUBDIR) echo ' ' SUBDIR $$subdir; \ 70 $(MAKE) $(PRINT_DIR) -C $$subdir 71 QUIET_FLEX = @echo ' ' FLEX $@; 72 QUIET_BISON = @echo ' ' BISON $@; 73 74 descend = \ 75 +@echo ' ' DESCEND $(1); \ 76 mkdir -p $(OUTPUT)$(1) && \ 77 $(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2) 78endif 79endif 80