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