Commit | Line | Data |
---|---|---|
b2441318 | 1 | # SPDX-License-Identifier: GPL-2.0 |
9e4a6648 | 2 | ifneq ($(O),) |
bf35182f | 3 | ifeq ($(origin O), command line) |
be40920f MH |
4 | dummy := $(if $(shell cd $(PWD); test -d $(O) || echo $(O)),$(error O=$(O) does not exist),) |
5 | ABSOLUTE_O := $(shell cd $(PWD); cd $(O) ; pwd) | |
bf35182f | 6 | OUTPUT := $(ABSOLUTE_O)/$(if $(subdir),$(subdir)/) |
c883122a | 7 | COMMAND_O := O=$(ABSOLUTE_O) |
bf35182f DH |
8 | ifeq ($(objtree),) |
9 | objtree := $(O) | |
10 | endif | |
98d89bfd | 11 | endif |
9e4a6648 | 12 | endif |
98d89bfd | 13 | |
98d89bfd | 14 | # check that the output directory actually exists |
9e4a6648 | 15 | ifneq ($(OUTPUT),) |
16f8259c | 16 | OUTDIR := $(shell cd $(OUTPUT) && pwd) |
98d89bfd BP |
17 | $(if $(OUTDIR),, $(error output directory "$(OUTPUT)" does not exist)) |
18 | endif | |
19 | ||
20 | # | |
21 | # Include saner warnings here, which can catch bugs: | |
22 | # | |
d8caf3eb BP |
23 | EXTRA_WARNINGS := -Wbad-function-cast |
24 | EXTRA_WARNINGS += -Wdeclaration-after-statement | |
25 | EXTRA_WARNINGS += -Wformat-security | |
26 | EXTRA_WARNINGS += -Wformat-y2k | |
27 | EXTRA_WARNINGS += -Winit-self | |
28 | EXTRA_WARNINGS += -Wmissing-declarations | |
29 | EXTRA_WARNINGS += -Wmissing-prototypes | |
30 | EXTRA_WARNINGS += -Wnested-externs | |
31 | EXTRA_WARNINGS += -Wno-system-headers | |
32 | EXTRA_WARNINGS += -Wold-style-definition | |
33 | EXTRA_WARNINGS += -Wpacked | |
34 | EXTRA_WARNINGS += -Wredundant-decls | |
d8caf3eb BP |
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 | |
98d89bfd | 41 | |
3866058e DCC |
42 | CC_NO_CLANG := $(shell $(CC) -dM -E -x c /dev/null | grep -Fq "__clang__"; echo $$?) |
43 | ||
7ed1c190 MK |
44 | # Makefiles suck: This macro sets a default value of $(2) for the |
45 | # variable named by $(1), unless the variable has been set by | |
46 | # environment or command line. This is necessary for CC and AR | |
47 | # because make sets default values, so the simpler ?= approach | |
48 | # won't work as expected. | |
49 | define allow-override | |
50 | $(if $(or $(findstring environment,$(origin $(1))),\ | |
51 | $(findstring command line,$(origin $(1)))),,\ | |
52 | $(eval $(1) = $(2))) | |
53 | endef | |
54 | ||
55 | # Allow setting various cross-compile vars or setting CROSS_COMPILE as a prefix. | |
56 | $(call allow-override,CC,$(CROSS_COMPILE)gcc) | |
57 | $(call allow-override,AR,$(CROSS_COMPILE)ar) | |
58 | $(call allow-override,LD,$(CROSS_COMPILE)ld) | |
59 | $(call allow-override,CXX,$(CROSS_COMPILE)g++) | |
60 | $(call allow-override,STRIP,$(CROSS_COMPILE)strip) | |
61 | ||
3866058e | 62 | ifeq ($(CC_NO_CLANG), 1) |
093b75ef ACM |
63 | EXTRA_WARNINGS += -Wstrict-aliasing=3 |
64 | endif | |
65 | ||
3337e682 ACM |
66 | # Hack to avoid type-punned warnings on old systems such as RHEL5: |
67 | # We should be changing CFLAGS and checking gcc version, but this | |
68 | # will do for now and keep the above -Wstrict-aliasing=3 in place | |
69 | # in newer systems. | |
70 | # Needed for the __raw_cmpxchg in tools/arch/x86/include/asm/cmpxchg.h | |
39e7317e ACM |
71 | # |
72 | # See https://lkml.org/lkml/2006/11/28/253 and https://gcc.gnu.org/gcc-4.8/changes.html, | |
73 | # that takes into account Linus's comments (search for Wshadow) for the reasoning about | |
74 | # -Wshadow not being interesting before gcc 4.8. | |
75 | ||
3337e682 ACM |
76 | ifneq ($(filter 3.%,$(MAKE_VERSION)),) # make-3 |
77 | EXTRA_WARNINGS += -fno-strict-aliasing | |
39e7317e ACM |
78 | EXTRA_WARNINGS += -Wno-shadow |
79 | else | |
80 | EXTRA_WARNINGS += -Wshadow | |
3337e682 ACM |
81 | endif |
82 | ||
98d89bfd BP |
83 | ifneq ($(findstring $(MAKEFLAGS), w),w) |
84 | PRINT_DIR = --no-print-directory | |
85 | else | |
86 | NO_SUBDIR = : | |
87 | endif | |
88 | ||
6f0fa58e | 89 | ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) |
e572d088 JP |
90 | silent=1 |
91 | endif | |
e572d088 | 92 | |
ca9dfc6c DH |
93 | # |
94 | # Define a callable command for descending to a new directory | |
95 | # | |
96 | # Call by doing: $(call descend,directory[,target]) | |
97 | # | |
98 | descend = \ | |
bf35182f | 99 | +mkdir -p $(OUTPUT)$(1) && \ |
2b73f65d | 100 | $(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2) |
ca9dfc6c | 101 | |
bf35182f | 102 | QUIET_SUBDIR0 = +$(MAKE) $(COMMAND_O) -C # space to separate -C and subdir |
98d89bfd BP |
103 | QUIET_SUBDIR1 = |
104 | ||
e572d088 | 105 | ifneq ($(silent),1) |
65fb0992 IM |
106 | ifneq ($(V),1) |
107 | QUIET_CC = @echo ' CC '$@; | |
bdebbacd | 108 | QUIET_CC_FPIC = @echo ' CC FPIC '$@; |
65fb0992 IM |
109 | QUIET_AR = @echo ' AR '$@; |
110 | QUIET_LINK = @echo ' LINK '$@; | |
111 | QUIET_MKDIR = @echo ' MKDIR '$@; | |
112 | QUIET_GEN = @echo ' GEN '$@; | |
98d89bfd | 113 | QUIET_SUBDIR0 = +@subdir= |
65fb0992 IM |
114 | QUIET_SUBDIR1 = ;$(NO_SUBDIR) \ |
115 | echo ' SUBDIR '$$subdir; \ | |
98d89bfd | 116 | $(MAKE) $(PRINT_DIR) -C $$subdir |
65fb0992 IM |
117 | QUIET_FLEX = @echo ' FLEX '$@; |
118 | QUIET_BISON = @echo ' BISON '$@; | |
bf35182f DH |
119 | |
120 | descend = \ | |
65fb0992 | 121 | +@echo ' DESCEND '$(1); \ |
bf35182f | 122 | mkdir -p $(OUTPUT)$(1) && \ |
2b73f65d | 123 | $(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2) |
b7248def JO |
124 | |
125 | QUIET_CLEAN = @printf ' CLEAN %s\n' $1; | |
126 | QUIET_INSTALL = @printf ' INSTALL %s\n' $1; | |
d3244248 | 127 | QUIET_UNINST = @printf ' UNINST %s\n' $1; |
65fb0992 | 128 | endif |
98d89bfd | 129 | endif |
9564a8cf RV |
130 | |
131 | pound := \# |