2 ifeq ($(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)
13 # check that the output directory actually exists
15 OUTDIR := $(shell cd $(OUTPUT) && /bin/pwd)
16 $(if $(OUTDIR),, $(error output directory "$(OUTPUT)" does not exist))
20 # Include saner warnings here, which can catch bugs:
22 EXTRA_WARNINGS := -Wbad-function-cast
23 EXTRA_WARNINGS += -Wdeclaration-after-statement
24 EXTRA_WARNINGS += -Wformat-security
25 EXTRA_WARNINGS += -Wformat-y2k
26 EXTRA_WARNINGS += -Winit-self
27 EXTRA_WARNINGS += -Wmissing-declarations
28 EXTRA_WARNINGS += -Wmissing-prototypes
29 EXTRA_WARNINGS += -Wnested-externs
30 EXTRA_WARNINGS += -Wno-system-headers
31 EXTRA_WARNINGS += -Wold-style-definition
32 EXTRA_WARNINGS += -Wpacked
33 EXTRA_WARNINGS += -Wredundant-decls
34 EXTRA_WARNINGS += -Wshadow
35 EXTRA_WARNINGS += -Wstrict-prototypes
36 EXTRA_WARNINGS += -Wswitch-default
37 EXTRA_WARNINGS += -Wswitch-enum
38 EXTRA_WARNINGS += -Wundef
39 EXTRA_WARNINGS += -Wwrite-strings
40 EXTRA_WARNINGS += -Wformat
42 CC_NO_CLANG := $(shell $(CC) -dM -E -x c /dev/null | grep -Fq "__clang__"; echo $$?)
44 ifeq ($(CC_NO_CLANG), 1)
45 EXTRA_WARNINGS += -Wstrict-aliasing=3
48 # Hack to avoid type-punned warnings on old systems such as RHEL5:
49 # We should be changing CFLAGS and checking gcc version, but this
50 # will do for now and keep the above -Wstrict-aliasing=3 in place
52 # Needed for the __raw_cmpxchg in tools/arch/x86/include/asm/cmpxchg.h
53 ifneq ($(filter 3.%,$(MAKE_VERSION)),) # make-3
54 EXTRA_WARNINGS += -fno-strict-aliasing
57 ifneq ($(findstring $(MAKEFLAGS), w),w)
58 PRINT_DIR = --no-print-directory
63 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
68 # Define a callable command for descending to a new directory
70 # Call by doing: $(call descend,directory[,target])
73 +mkdir -p $(OUTPUT)$(1) && \
74 $(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2)
76 QUIET_SUBDIR0 = +$(MAKE) $(COMMAND_O) -C # space to separate -C and subdir
81 QUIET_CC = @echo ' CC '$@;
82 QUIET_CC_FPIC = @echo ' CC FPIC '$@;
83 QUIET_AR = @echo ' AR '$@;
84 QUIET_LINK = @echo ' LINK '$@;
85 QUIET_MKDIR = @echo ' MKDIR '$@;
86 QUIET_GEN = @echo ' GEN '$@;
87 QUIET_SUBDIR0 = +@subdir=
88 QUIET_SUBDIR1 = ;$(NO_SUBDIR) \
89 echo ' SUBDIR '$$subdir; \
90 $(MAKE) $(PRINT_DIR) -C $$subdir
91 QUIET_FLEX = @echo ' FLEX '$@;
92 QUIET_BISON = @echo ' BISON '$@;
95 +@echo ' DESCEND '$(1); \
96 mkdir -p $(OUTPUT)$(1) && \
97 $(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2)
99 QUIET_CLEAN = @printf ' CLEAN %s\n' $1;
100 QUIET_INSTALL = @printf ' INSTALL %s\n' $1;