linux-6.15/scripts/Makefile.extrawarn

1 # SPDX-License-Identifier: GPL-2.0
6 # They are independent, and can be combined like W=12 or W=123e.
10 KBUILD_CFLAGS += -Wall
11 KBUILD_CFLAGS += -Wextra
12 KBUILD_CFLAGS += -Wundef
13 KBUILD_CFLAGS += -Werror=implicit-function-declaration
14 KBUILD_CFLAGS += -Werror=implicit-int
15 KBUILD_CFLAGS += -Werror=return-type
16 KBUILD_CFLAGS += -Werror=strict-prototypes
17 KBUILD_CFLAGS += -Wno-format-security
18 KBUILD_CFLAGS += -Wno-trigraphs
19 KBUILD_CFLAGS += $(call cc-disable-warning, frame-address)
20 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
21 KBUILD_CFLAGS += -Wmissing-declarations
22 KBUILD_CFLAGS += -Wmissing-prototypes
25 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
28 KBUILD_CPPFLAGS-$(CONFIG_WERROR) += -Werror
29 KBUILD_CPPFLAGS += $(KBUILD_CPPFLAGS-y)
30 KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUNDS) += -Wno-array-bounds
33 # The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable.
34 KBUILD_CFLAGS += -Wno-gnu
38 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow-non-kprintf)
39 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation-non-kprintf)
43 # which can result in unexpected behavior. However, in many audited cases of
46 # other non-const members, or the containing object is not const so the field
47 # can be modified via memcpy() / memset(). While the variable warning also gets
49 # because -Wuninitialized will still flag when an uninitialized const variable
51 KBUILD_CFLAGS += $(call cc-disable-warning, default-const-init-unsafe)
55 KBUILD_CFLAGS += -Wno-main
59 KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer)
62 KBUILD_CFLAGS += -Wvla
64 # disable pointer signed / unsigned warnings in gcc 4.0
65 KBUILD_CFLAGS += -Wno-pointer-sign
69 # globally built with -Wcast-function-type.
70 KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type)
72 # Currently, disable -Wstringop-overflow for GCC 11, globally.
73 KBUILD_CFLAGS-$(CONFIG_CC_NO_STRINGOP_OVERFLOW) += $(call cc-disable-warning, stringop-overflow)
74 KBUILD_CFLAGS-$(CONFIG_CC_STRINGOP_OVERFLOW) += $(call cc-option, -Wstringop-overflow)
76 # Currently, disable -Wunterminated-string-initialization as broken
77 KBUILD_CFLAGS += $(call cc-disable-warning, unterminated-string-initialization)
81 # -Wno-alloc-size-larger-than would normally be used here, earlier versions
83 # warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX
88 # choice, we must perform a versioned check to disable this warning.
90 KBUILD_CFLAGS-$(call gcc-min-version, 90100) += -Wno-alloc-size-larger-than
91 KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH)
93 # Prohibit date/time macros, which would make the build non-deterministic
94 KBUILD_CFLAGS += -Werror=date-time
97 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
100 KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
103 KBUILD_CFLAGS += $(call cc-option,-Wenum-conversion)
105 KBUILD_CFLAGS += -Wunused
108 # W=1 - warnings which may be relevant and do not occur too often
112 KBUILD_CFLAGS += -Wmissing-format-attribute
113 KBUILD_CFLAGS += -Wmissing-include-dirs
114 KBUILD_CFLAGS += $(call cc-option, -Wunused-const-variable)
116 KBUILD_CPPFLAGS += -Wundef
117 KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN1
122 # Suppress them by using -Wno... except for W=1.
123 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
124 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
125 KBUILD_CFLAGS += $(call cc-disable-warning, packed-not-aligned)
126 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
128 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
130 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
132 KBUILD_CFLAGS += -Wno-override-init # alias for -Wno-initializer-overrides in clang
135 # Clang before clang-16 would warn on default argument promotions.
136 ifneq ($(call clang-min-version, 160000),y)
137 # Disable -Wformat
138 KBUILD_CFLAGS += -Wno-format
139 # Then re-enable flags that were part of the -Wformat group that aren't
141 KBUILD_CFLAGS += -Wformat-extra-args -Wformat-invalid-specifier
142 KBUILD_CFLAGS += -Wformat-zero-length -Wnonnull
143 # Requires clang-12+.
144 ifeq ($(call clang-min-version, 120000),y)
145 KBUILD_CFLAGS += -Wformat-insufficient-args
148 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-to-enum-cast)
149 KBUILD_CFLAGS += -Wno-tautological-constant-out-of-range-compare
150 KBUILD_CFLAGS += $(call cc-disable-warning, unaligned-access)
151 KBUILD_CFLAGS += -Wno-enum-compare-conditional
157 # W=2 - warnings which occur quite often but may still be relevant
161 KBUILD_CFLAGS += -Wdisabled-optimization
162 KBUILD_CFLAGS += -Wshadow
163 KBUILD_CFLAGS += $(call cc-option, -Wlogical-op)
164 KBUILD_CFLAGS += $(call cc-option, -Wunused-macros)
166 KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN2
170 # The following turn off the warnings enabled by -Wextra
171 KBUILD_CFLAGS += -Wno-missing-field-initializers
172 KBUILD_CFLAGS += -Wno-type-limits
173 KBUILD_CFLAGS += -Wno-shift-negative-value
176 KBUILD_CFLAGS += -Wno-enum-enum-conversion
180 KBUILD_CFLAGS += -Wno-maybe-uninitialized
186 # W=3 - more obscure warnings, can most likely be ignored
190 KBUILD_CFLAGS += -Wbad-function-cast
191 KBUILD_CFLAGS += -Wcast-align
192 KBUILD_CFLAGS += -Wcast-qual
193 KBUILD_CFLAGS += -Wconversion
194 KBUILD_CFLAGS += -Wpacked
195 KBUILD_CFLAGS += -Wpadded
196 KBUILD_CFLAGS += -Wpointer-arith
197 KBUILD_CFLAGS += -Wredundant-decls
198 KBUILD_CFLAGS += -Wsign-compare
199 KBUILD_CFLAGS += -Wswitch-default
201 KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN3
205 # The following turn off the warnings enabled by -Wextra
206 KBUILD_CFLAGS += -Wno-sign-compare
207 KBUILD_CFLAGS += -Wno-unused-parameter
212 # W=e - error out on warnings
216 KBUILD_CFLAGS += -Werror