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TOMOYO Linux Cross Reference
Linux/scripts/Makefile.extrawarn

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  1 # SPDX-License-Identifier: GPL-2.0
  2 # ==========================================================================
  3 # make W=... settings
  4 #
  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.
  7 # ==========================================================================
  8 
  9 # Default set of warnings, always enabled
 10 KBUILD_CFLAGS += -Wall
 11 KBUILD_CFLAGS += -Wundef
 12 KBUILD_CFLAGS += -Werror=implicit-function-declaration
 13 KBUILD_CFLAGS += -Werror=implicit-int
 14 KBUILD_CFLAGS += -Werror=return-type
 15 KBUILD_CFLAGS += -Werror=strict-prototypes
 16 KBUILD_CFLAGS += -Wno-format-security
 17 KBUILD_CFLAGS += -Wno-trigraphs
 18 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
 19 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 20 KBUILD_CFLAGS += -Wmissing-declarations
 21 KBUILD_CFLAGS += -Wmissing-prototypes
 22 
 23 ifneq ($(CONFIG_FRAME_WARN),0)
 24 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
 25 endif
 26 
 27 KBUILD_CPPFLAGS-$(CONFIG_WERROR) += -Werror
 28 KBUILD_CPPFLAGS += $(KBUILD_CPPFLAGS-y)
 29 KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUNDS) += -Wno-array-bounds
 30 
 31 ifdef CONFIG_CC_IS_CLANG
 32 # The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable.
 33 KBUILD_CFLAGS += -Wno-gnu
 34 else
 35 
 36 # gcc inanely warns about local variables called 'main'
 37 KBUILD_CFLAGS += -Wno-main
 38 endif
 39 
 40 # These result in bogus false positives
 41 KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer)
 42 
 43 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
 44 KBUILD_CFLAGS += -Wvla
 45 
 46 # disable pointer signed / unsigned warnings in gcc 4.0
 47 KBUILD_CFLAGS += -Wno-pointer-sign
 48 
 49 # In order to make sure new function cast mismatches are not introduced
 50 # in the kernel (to avoid tripping CFI checking), the kernel should be
 51 # globally built with -Wcast-function-type.
 52 KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type)
 53 
 54 # The allocators already balk at large sizes, so silence the compiler
 55 # warnings for bounds checks involving those possible values. While
 56 # -Wno-alloc-size-larger-than would normally be used here, earlier versions
 57 # of gcc (<9.1) weirdly don't handle the option correctly when _other_
 58 # warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX
 59 # doesn't work (as it is documented to), silently resolving to "0" prior to
 60 # version 9.1 (and producing an error more recently). Numeric values larger
 61 # than PTRDIFF_MAX also don't work prior to version 9.1, which are silently
 62 # ignored, continuing to default to PTRDIFF_MAX. So, left with no other
 63 # choice, we must perform a versioned check to disable this warning.
 64 # https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au
 65 KBUILD_CFLAGS-$(call gcc-min-version, 90100) += -Wno-alloc-size-larger-than
 66 KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH)
 67 
 68 # Prohibit date/time macros, which would make the build non-deterministic
 69 KBUILD_CFLAGS += -Werror=date-time
 70 
 71 # enforce correct pointer usage
 72 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
 73 
 74 # Require designated initializers for all marked structures
 75 KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
 76 
 77 # Warn if there is an enum types mismatch
 78 KBUILD_CFLAGS += $(call cc-option,-Wenum-conversion)
 79 
 80 KBUILD_CFLAGS += -Wextra
 81 KBUILD_CFLAGS += -Wunused
 82 
 83 #
 84 # W=1 - warnings which may be relevant and do not occur too often
 85 #
 86 ifneq ($(findstring 1, $(KBUILD_EXTRA_WARN)),)
 87 
 88 KBUILD_CFLAGS += -Wmissing-format-attribute
 89 KBUILD_CFLAGS += -Wmissing-include-dirs
 90 KBUILD_CFLAGS += $(call cc-option, -Wunused-const-variable)
 91 
 92 KBUILD_CPPFLAGS += -Wundef
 93 KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN1
 94 
 95 else
 96 
 97 # Some diagnostics enabled by default are noisy.
 98 # Suppress them by using -Wno... except for W=1.
 99 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
100 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
101 KBUILD_CFLAGS += $(call cc-disable-warning, packed-not-aligned)
102 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
103 ifdef CONFIG_CC_IS_GCC
104 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
105 else
106 # Clang checks for overflow/truncation with '%p', while GCC does not:
107 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111219
108 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow-non-kprintf)
109 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation-non-kprintf)
110 endif
111 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
112 
113 KBUILD_CFLAGS += -Wno-override-init # alias for -Wno-initializer-overrides in clang
114 
115 ifdef CONFIG_CC_IS_CLANG
116 # Clang before clang-16 would warn on default argument promotions.
117 ifneq ($(call clang-min-version, 160000),y)
118 # Disable -Wformat
119 KBUILD_CFLAGS += -Wno-format
120 # Then re-enable flags that were part of the -Wformat group that aren't
121 # problematic.
122 KBUILD_CFLAGS += -Wformat-extra-args -Wformat-invalid-specifier
123 KBUILD_CFLAGS += -Wformat-zero-length -Wnonnull
124 # Requires clang-12+.
125 ifeq ($(call clang-min-version, 120000),y)
126 KBUILD_CFLAGS += -Wformat-insufficient-args
127 endif
128 endif
129 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-to-enum-cast)
130 KBUILD_CFLAGS += -Wno-tautological-constant-out-of-range-compare
131 KBUILD_CFLAGS += $(call cc-disable-warning, unaligned-access)
132 KBUILD_CFLAGS += -Wno-enum-compare-conditional
133 KBUILD_CFLAGS += -Wno-enum-enum-conversion
134 endif
135 
136 endif
137 
138 #
139 # W=2 - warnings which occur quite often but may still be relevant
140 #
141 ifneq ($(findstring 2, $(KBUILD_EXTRA_WARN)),)
142 
143 KBUILD_CFLAGS += -Wdisabled-optimization
144 KBUILD_CFLAGS += -Wshadow
145 KBUILD_CFLAGS += $(call cc-option, -Wlogical-op)
146 KBUILD_CFLAGS += $(call cc-option, -Wunused-macros)
147 
148 KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN2
149 
150 else
151 
152 # The following turn off the warnings enabled by -Wextra
153 KBUILD_CFLAGS += -Wno-missing-field-initializers
154 KBUILD_CFLAGS += -Wno-type-limits
155 KBUILD_CFLAGS += -Wno-shift-negative-value
156 
157 ifdef CONFIG_CC_IS_GCC
158 KBUILD_CFLAGS += -Wno-maybe-uninitialized
159 endif
160 
161 endif
162 
163 #
164 # W=3 - more obscure warnings, can most likely be ignored
165 #
166 ifneq ($(findstring 3, $(KBUILD_EXTRA_WARN)),)
167 
168 KBUILD_CFLAGS += -Wbad-function-cast
169 KBUILD_CFLAGS += -Wcast-align
170 KBUILD_CFLAGS += -Wcast-qual
171 KBUILD_CFLAGS += -Wconversion
172 KBUILD_CFLAGS += -Wpacked
173 KBUILD_CFLAGS += -Wpadded
174 KBUILD_CFLAGS += -Wpointer-arith
175 KBUILD_CFLAGS += -Wredundant-decls
176 KBUILD_CFLAGS += -Wsign-compare
177 KBUILD_CFLAGS += -Wswitch-default
178 
179 KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN3
180 
181 else
182 
183 # The following turn off the warnings enabled by -Wextra
184 KBUILD_CFLAGS += -Wno-sign-compare
185 KBUILD_CFLAGS += -Wno-unused-parameter
186 
187 endif
188 
189 #
190 # W=e - error out on warnings
191 #
192 ifneq ($(findstring e, $(KBUILD_EXTRA_WARN)),)
193 
194 KBUILD_CFLAGS += -Werror
195 
196 endif

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