Commit | Line | Data |
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b2441318 | 1 | # SPDX-License-Identifier: GPL-2.0 |
a86fe353 | 2 | # ========================================================================== |
a86fe353 MY |
3 | # make W=... settings |
4 | # | |
c77d06e7 YD |
5 | # There are four warning groups enabled by W=1, W=2, W=3, and W=e |
6 | # They are independent, and can be combined like W=12 or W=123e. | |
a86fe353 MY |
7 | # ========================================================================== |
8 | ||
321cb030 XW |
9 | KBUILD_CFLAGS += $(call cc-disable-warning, packed-not-aligned) |
10 | ||
e27128db MY |
11 | # backward compatibility |
12 | KBUILD_EXTRA_WARN ?= $(KBUILD_ENABLE_EXTRA_GCC_CHECKS) | |
13 | ||
a86fe353 | 14 | ifeq ("$(origin W)", "command line") |
e27128db | 15 | KBUILD_EXTRA_WARN := $(W) |
a86fe353 MY |
16 | endif |
17 | ||
e27128db MY |
18 | export KBUILD_EXTRA_WARN |
19 | ||
64a91907 MY |
20 | # |
21 | # W=1 - warnings which may be relevant and do not occur too often | |
22 | # | |
e27128db | 23 | ifneq ($(findstring 1, $(KBUILD_EXTRA_WARN)),) |
a86fe353 | 24 | |
64a91907 MY |
25 | KBUILD_CFLAGS += -Wextra -Wunused -Wno-unused-parameter |
26 | KBUILD_CFLAGS += -Wmissing-declarations | |
27 | KBUILD_CFLAGS += -Wmissing-format-attribute | |
28 | KBUILD_CFLAGS += -Wmissing-prototypes | |
29 | KBUILD_CFLAGS += -Wold-style-definition | |
30 | KBUILD_CFLAGS += -Wmissing-include-dirs | |
31 | KBUILD_CFLAGS += $(call cc-option, -Wunused-but-set-variable) | |
32 | KBUILD_CFLAGS += $(call cc-option, -Wunused-const-variable) | |
33 | KBUILD_CFLAGS += $(call cc-option, -Wpacked-not-aligned) | |
34 | KBUILD_CFLAGS += $(call cc-option, -Wstringop-truncation) | |
4c8dd95a | 35 | # The following turn off the warnings enabled by -Wextra |
64a91907 MY |
36 | KBUILD_CFLAGS += -Wno-missing-field-initializers |
37 | KBUILD_CFLAGS += -Wno-sign-compare | |
355a3587 | 38 | KBUILD_CFLAGS += -Wno-type-limits |
1344794a | 39 | KBUILD_CFLAGS += -Wno-shift-negative-value |
a86fe353 | 40 | |
80b6093b | 41 | KBUILD_CPPFLAGS += -Wundef |
6863f564 MY |
42 | KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN1 |
43 | ||
26ea6bb1 BW |
44 | else |
45 | ||
64a91907 MY |
46 | # Some diagnostics enabled by default are noisy. |
47 | # Suppress them by using -Wno... except for W=1. | |
48 | ||
076f421d | 49 | ifdef CONFIG_CC_IS_CLANG |
a1494304 | 50 | KBUILD_CFLAGS += -Wno-initializer-overrides |
b0839b28 | 51 | # Clang before clang-16 would warn on default argument promotions. |
88b61e3b | 52 | ifneq ($(call clang-min-version, 160000),y) |
b0839b28 | 53 | # Disable -Wformat |
21f9c8a1 | 54 | KBUILD_CFLAGS += -Wno-format |
b0839b28 ND |
55 | # Then re-enable flags that were part of the -Wformat group that aren't |
56 | # problematic. | |
57 | KBUILD_CFLAGS += -Wformat-extra-args -Wformat-invalid-specifier | |
58 | KBUILD_CFLAGS += -Wformat-zero-length -Wnonnull | |
59 | # Requires clang-12+. | |
88b61e3b | 60 | ifeq ($(call clang-min-version, 120000),y) |
b0839b28 ND |
61 | KBUILD_CFLAGS += -Wformat-insufficient-args |
62 | endif | |
63 | endif | |
a1494304 | 64 | KBUILD_CFLAGS += -Wno-sign-compare |
82f2bc2f | 65 | KBUILD_CFLAGS += $(call cc-disable-warning, pointer-to-enum-cast) |
afe956c5 | 66 | KBUILD_CFLAGS += -Wno-tautological-constant-out-of-range-compare |
1cf5f151 | 67 | KBUILD_CFLAGS += $(call cc-disable-warning, unaligned-access) |
21206351 | 68 | KBUILD_CFLAGS += $(call cc-disable-warning, cast-function-type-strict) |
26ea6bb1 | 69 | endif |
64a91907 MY |
70 | |
71 | endif | |
72 | ||
73 | # | |
74 | # W=2 - warnings which occur quite often but may still be relevant | |
75 | # | |
e27128db | 76 | ifneq ($(findstring 2, $(KBUILD_EXTRA_WARN)),) |
64a91907 | 77 | |
64a91907 | 78 | KBUILD_CFLAGS += -Wdisabled-optimization |
64a91907 MY |
79 | KBUILD_CFLAGS += -Wshadow |
80 | KBUILD_CFLAGS += $(call cc-option, -Wlogical-op) | |
81 | KBUILD_CFLAGS += -Wmissing-field-initializers | |
355a3587 | 82 | KBUILD_CFLAGS += -Wtype-limits |
64a91907 MY |
83 | KBUILD_CFLAGS += $(call cc-option, -Wmaybe-uninitialized) |
84 | KBUILD_CFLAGS += $(call cc-option, -Wunused-macros) | |
85 | ||
6863f564 MY |
86 | KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN2 |
87 | ||
64a91907 MY |
88 | endif |
89 | ||
90 | # | |
91 | # W=3 - more obscure warnings, can most likely be ignored | |
92 | # | |
e27128db | 93 | ifneq ($(findstring 3, $(KBUILD_EXTRA_WARN)),) |
64a91907 MY |
94 | |
95 | KBUILD_CFLAGS += -Wbad-function-cast | |
095fbca0 | 96 | KBUILD_CFLAGS += -Wcast-align |
64a91907 MY |
97 | KBUILD_CFLAGS += -Wcast-qual |
98 | KBUILD_CFLAGS += -Wconversion | |
99 | KBUILD_CFLAGS += -Wpacked | |
100 | KBUILD_CFLAGS += -Wpadded | |
101 | KBUILD_CFLAGS += -Wpointer-arith | |
102 | KBUILD_CFLAGS += -Wredundant-decls | |
a97ea93e | 103 | KBUILD_CFLAGS += -Wsign-compare |
64a91907 MY |
104 | KBUILD_CFLAGS += -Wswitch-default |
105 | KBUILD_CFLAGS += $(call cc-option, -Wpacked-bitfield-compat) | |
106 | ||
6863f564 MY |
107 | KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN3 |
108 | ||
a86fe353 | 109 | endif |
c77d06e7 YD |
110 | |
111 | # | |
112 | # W=e - error out on warnings | |
113 | # | |
114 | ifneq ($(findstring e, $(KBUILD_EXTRA_WARN)),) | |
115 | ||
116 | KBUILD_CFLAGS += -Werror | |
117 | ||
118 | endif |