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 ABSOLUTE_O := $(realpath $(O))
4 dummy := $(if $(ABSOLUTE_O),,$(error O=$(O) does not exist))
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 := $(realpath $(OUTPUT))
16$(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
42CC_NO_CLANG := $(shell $(CC) -dM -E -x c /dev/null | grep -Fq "__clang__"; echo $$?)
43
44ifeq ($(CC_NO_CLANG), 1)
45EXTRA_WARNINGS += -Wstrict-aliasing=3
46endif
47
48# Hack to avoid type-punned warnings on old systems such as RHEL5:
49# We should be changing CFLAGS and checking gcc version, but this
50# will do for now and keep the above -Wstrict-aliasing=3 in place
51# in newer systems.
52# Needed for the __raw_cmpxchg in tools/arch/x86/include/asm/cmpxchg.h
53ifneq ($(filter 3.%,$(MAKE_VERSION)),) # make-3
54EXTRA_WARNINGS += -fno-strict-aliasing
55endif
56
57ifneq ($(findstring $(MAKEFLAGS), w),w)
58PRINT_DIR = --no-print-directory
59else
60NO_SUBDIR = :
61endif
62
63ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
64 silent=1
65endif
66
67#
68# Define a callable command for descending to a new directory
69#
70# Call by doing: $(call descend,directory[,target])
71#
72descend = \
73 +mkdir -p $(OUTPUT)$(1) && \
74 $(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2)
75
76QUIET_SUBDIR0 = +$(MAKE) $(COMMAND_O) -C # space to separate -C and subdir
77QUIET_SUBDIR1 =
78
79ifneq ($(silent),1)
80 ifneq ($(V),1)
81 QUIET_CC = @echo ' CC '$@;
82 QUIET_CC_FPIC = @echo ' CC FPIC '$@;
83 QUIET_AR = @echo ' AR '$@;
84 QUIET_LINK = @echo ' LINK '$@;
85 QUIET_MKDIR = @echo ' MKDIR '$@;
86 QUIET_GEN = @echo ' GEN '$@;
87 QUIET_SUBDIR0 = +@subdir=
88 QUIET_SUBDIR1 = ;$(NO_SUBDIR) \
89 echo ' SUBDIR '$$subdir; \
90 $(MAKE) $(PRINT_DIR) -C $$subdir
91 QUIET_FLEX = @echo ' FLEX '$@;
92 QUIET_BISON = @echo ' BISON '$@;
93
94 descend = \
95 +@echo ' DESCEND '$(1); \
96 mkdir -p $(OUTPUT)$(1) && \
97 $(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2)
98
99 QUIET_CLEAN = @printf ' CLEAN %s\n' $1;
100 QUIET_INSTALL = @printf ' INSTALL %s\n' $1;
101 endif
102endif