1ifneq ($(O),) 2ifeq ($(origin O), command line) 3 dummy := $(if $(shell cd $(PWD); test -d $(O) || echo $(O)),$(error O=$(O) does not exist),) 4 ABSOLUTE_O := $(shell cd $(PWD); 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 $(MAKEFLAGS), w),w) 44PRINT_DIR = --no-print-directory 45else 46NO_SUBDIR = : 47endif 48 49ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4 50ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),) 51 silent=1 52endif 53else # make-3.8x 54ifneq ($(filter s% -s%,$(MAKEFLAGS)),) 55 silent=1 56endif 57endif 58 59# 60# Define a callable command for descending to a new directory 61# 62# Call by doing: $(call descend,directory[,target]) 63# 64descend = \ 65 +mkdir -p $(OUTPUT)$(1) && \ 66 $(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2) 67 68QUIET_SUBDIR0 = +$(MAKE) $(COMMAND_O) -C # space to separate -C and subdir 69QUIET_SUBDIR1 = 70 71ifneq ($(silent),1) 72 ifneq ($(V),1) 73 QUIET_CC = @echo ' CC '$@; 74 QUIET_CC_FPIC = @echo ' CC FPIC '$@; 75 QUIET_AR = @echo ' AR '$@; 76 QUIET_LINK = @echo ' LINK '$@; 77 QUIET_MKDIR = @echo ' MKDIR '$@; 78 QUIET_GEN = @echo ' GEN '$@; 79 QUIET_SUBDIR0 = +@subdir= 80 QUIET_SUBDIR1 = ;$(NO_SUBDIR) \ 81 echo ' SUBDIR '$$subdir; \ 82 $(MAKE) $(PRINT_DIR) -C $$subdir 83 QUIET_FLEX = @echo ' FLEX '$@; 84 QUIET_BISON = @echo ' BISON '$@; 85 86 descend = \ 87 +@echo ' DESCEND '$(1); \ 88 mkdir -p $(OUTPUT)$(1) && \ 89 $(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2) 90 91 QUIET_CLEAN = @printf ' CLEAN %s\n' $1; 92 QUIET_INSTALL = @printf ' INSTALL %s\n' $1; 93 endif 94endif 95 96pound := \# 97