Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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-prototypes
36EXTRA_WARNINGS += -Wswitch-default
37EXTRA_WARNINGS += -Wswitch-enum
38EXTRA_WARNINGS += -Wundef
39EXTRA_WARNINGS += -Wwrite-strings
40EXTRA_WARNINGS += -Wformat
41
42ifneq ($(CC), clang)
43EXTRA_WARNINGS += -Wstrict-aliasing=3
44endif
45
46ifneq ($(findstring $(MAKEFLAGS), w),w)
47PRINT_DIR = --no-print-directory
48else
49NO_SUBDIR = :
50endif
51
52ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
53ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
54 silent=1
55endif
56else # make-3.8x
57ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
58 silent=1
59endif
60endif
61
62#
63# Define a callable command for descending to a new directory
64#
65# Call by doing: $(call descend,directory[,target])
66#
67descend = \
68 +mkdir -p $(OUTPUT)$(1) && \
69 $(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2)
70
71QUIET_SUBDIR0 = +$(MAKE) $(COMMAND_O) -C # space to separate -C and subdir
72QUIET_SUBDIR1 =
73
74ifneq ($(silent),1)
75 ifneq ($(V),1)
76 QUIET_CC = @echo ' CC '$@;
77 QUIET_CC_FPIC = @echo ' CC FPIC '$@;
78 QUIET_AR = @echo ' AR '$@;
79 QUIET_LINK = @echo ' LINK '$@;
80 QUIET_MKDIR = @echo ' MKDIR '$@;
81 QUIET_GEN = @echo ' GEN '$@;
82 QUIET_SUBDIR0 = +@subdir=
83 QUIET_SUBDIR1 = ;$(NO_SUBDIR) \
84 echo ' SUBDIR '$$subdir; \
85 $(MAKE) $(PRINT_DIR) -C $$subdir
86 QUIET_FLEX = @echo ' FLEX '$@;
87 QUIET_BISON = @echo ' BISON '$@;
88
89 descend = \
90 +@echo ' DESCEND '$(1); \
91 mkdir -p $(OUTPUT)$(1) && \
92 $(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2)
93
94 QUIET_CLEAN = @printf ' CLEAN %s\n' $1;
95 QUIET_INSTALL = @printf ' INSTALL %s\n' $1;
96 endif
97endif