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TOMOYO Linux Cross Reference
Linux/scripts/Makefile.extrawarn

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Diff markup

Differences between /scripts/Makefile.extrawarn (Architecture mips) and /scripts/Makefile.extrawarn (Architecture ppc)


  1 # SPDX-License-Identifier: GPL-2.0                  1 # SPDX-License-Identifier: GPL-2.0
  2 # ============================================      2 # ==========================================================================
  3 # make W=... settings                               3 # make W=... settings
  4 #                                                   4 #
  5 # There are four warning groups enabled by W=1      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 li      6 # They are independent, and can be combined like W=12 or W=123e.
  7 # ============================================      7 # ==========================================================================
  8                                                     8 
  9 # Default set of warnings, always enabled           9 # Default set of warnings, always enabled
 10 KBUILD_CFLAGS += -Wall                             10 KBUILD_CFLAGS += -Wall
 11 KBUILD_CFLAGS += -Wundef                           11 KBUILD_CFLAGS += -Wundef
 12 KBUILD_CFLAGS += -Werror=implicit-function-dec     12 KBUILD_CFLAGS += -Werror=implicit-function-declaration
 13 KBUILD_CFLAGS += -Werror=implicit-int              13 KBUILD_CFLAGS += -Werror=implicit-int
 14 KBUILD_CFLAGS += -Werror=return-type               14 KBUILD_CFLAGS += -Werror=return-type
 15 KBUILD_CFLAGS += -Werror=strict-prototypes         15 KBUILD_CFLAGS += -Werror=strict-prototypes
 16 KBUILD_CFLAGS += -Wno-format-security              16 KBUILD_CFLAGS += -Wno-format-security
 17 KBUILD_CFLAGS += -Wno-trigraphs                    17 KBUILD_CFLAGS += -Wno-trigraphs
 18 KBUILD_CFLAGS += $(call cc-disable-warning,fra     18 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
 19 KBUILD_CFLAGS += $(call cc-disable-warning, ad     19 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 20 KBUILD_CFLAGS += -Wmissing-declarations            20 KBUILD_CFLAGS += -Wmissing-declarations
 21 KBUILD_CFLAGS += -Wmissing-prototypes              21 KBUILD_CFLAGS += -Wmissing-prototypes
 22                                                    22 
 23 ifneq ($(CONFIG_FRAME_WARN),0)                     23 ifneq ($(CONFIG_FRAME_WARN),0)
 24 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_     24 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
 25 endif                                              25 endif
 26                                                    26 
 27 KBUILD_CPPFLAGS-$(CONFIG_WERROR) += -Werror        27 KBUILD_CPPFLAGS-$(CONFIG_WERROR) += -Werror
 28 KBUILD_CPPFLAGS += $(KBUILD_CPPFLAGS-y)            28 KBUILD_CPPFLAGS += $(KBUILD_CPPFLAGS-y)
 29 KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUNDS) +=      29 KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUNDS) += -Wno-array-bounds
 30                                                    30 
 31 ifdef CONFIG_CC_IS_CLANG                           31 ifdef CONFIG_CC_IS_CLANG
 32 # The kernel builds with '-std=gnu11' so use o     32 # The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable.
 33 KBUILD_CFLAGS += -Wno-gnu                          33 KBUILD_CFLAGS += -Wno-gnu
 34 else                                               34 else
 35                                                    35 
 36 # gcc inanely warns about local variables call     36 # gcc inanely warns about local variables called 'main'
 37 KBUILD_CFLAGS += -Wno-main                         37 KBUILD_CFLAGS += -Wno-main
 38 endif                                              38 endif
 39                                                    39 
 40 # These result in bogus false positives            40 # These result in bogus false positives
 41 KBUILD_CFLAGS += $(call cc-disable-warning, da     41 KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer)
 42                                                    42 
 43 # Variable Length Arrays (VLAs) should not be      43 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
 44 KBUILD_CFLAGS += -Wvla                             44 KBUILD_CFLAGS += -Wvla
 45                                                    45 
 46 # disable pointer signed / unsigned warnings i     46 # disable pointer signed / unsigned warnings in gcc 4.0
 47 KBUILD_CFLAGS += -Wno-pointer-sign                 47 KBUILD_CFLAGS += -Wno-pointer-sign
 48                                                    48 
 49 # In order to make sure new function cast mism     49 # In order to make sure new function cast mismatches are not introduced
 50 # in the kernel (to avoid tripping CFI checkin     50 # in the kernel (to avoid tripping CFI checking), the kernel should be
 51 # globally built with -Wcast-function-type.        51 # globally built with -Wcast-function-type.
 52 KBUILD_CFLAGS += $(call cc-option, -Wcast-func     52 KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type)
 53                                                    53 
 54 # The allocators already balk at large sizes,      54 # The allocators already balk at large sizes, so silence the compiler
 55 # warnings for bounds checks involving those p     55 # warnings for bounds checks involving those possible values. While
 56 # -Wno-alloc-size-larger-than would normally b     56 # -Wno-alloc-size-larger-than would normally be used here, earlier versions
 57 # of gcc (<9.1) weirdly don't handle the optio     57 # of gcc (<9.1) weirdly don't handle the option correctly when _other_
 58 # warnings are produced (?!). Using -Walloc-si     58 # warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX
 59 # doesn't work (as it is documented to), silen     59 # doesn't work (as it is documented to), silently resolving to "0" prior to
 60 # version 9.1 (and producing an error more rec     60 # version 9.1 (and producing an error more recently). Numeric values larger
 61 # than PTRDIFF_MAX also don't work prior to ve     61 # than PTRDIFF_MAX also don't work prior to version 9.1, which are silently
 62 # ignored, continuing to default to PTRDIFF_MA     62 # ignored, continuing to default to PTRDIFF_MAX. So, left with no other
 63 # choice, we must perform a versioned check to     63 # choice, we must perform a versioned check to disable this warning.
 64 # https://lore.kernel.org/lkml/20210824115859.     64 # https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au
 65 KBUILD_CFLAGS-$(call gcc-min-version, 90100) +     65 KBUILD_CFLAGS-$(call gcc-min-version, 90100) += -Wno-alloc-size-larger-than
 66 KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_C     66 KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH)
 67                                                    67 
 68 # Prohibit date/time macros, which would make      68 # Prohibit date/time macros, which would make the build non-deterministic
 69 KBUILD_CFLAGS += -Werror=date-time                 69 KBUILD_CFLAGS += -Werror=date-time
 70                                                    70 
 71 # enforce correct pointer usage                    71 # enforce correct pointer usage
 72 KBUILD_CFLAGS += $(call cc-option,-Werror=inco     72 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
 73                                                    73 
 74 # Require designated initializers for all mark     74 # Require designated initializers for all marked structures
 75 KBUILD_CFLAGS += $(call cc-option,-Werror=desi     75 KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
 76                                                    76 
 77 # Warn if there is an enum types mismatch          77 # Warn if there is an enum types mismatch
 78 KBUILD_CFLAGS += $(call cc-option,-Wenum-conve     78 KBUILD_CFLAGS += $(call cc-option,-Wenum-conversion)
 79                                                    79 
 80 KBUILD_CFLAGS += -Wextra                           80 KBUILD_CFLAGS += -Wextra
 81 KBUILD_CFLAGS += -Wunused                          81 KBUILD_CFLAGS += -Wunused
 82                                                    82 
 83 #                                                  83 #
 84 # W=1 - warnings which may be relevant and do      84 # W=1 - warnings which may be relevant and do not occur too often
 85 #                                                  85 #
 86 ifneq ($(findstring 1, $(KBUILD_EXTRA_WARN)),)     86 ifneq ($(findstring 1, $(KBUILD_EXTRA_WARN)),)
 87                                                    87 
 88 KBUILD_CFLAGS += -Wmissing-format-attribute        88 KBUILD_CFLAGS += -Wmissing-format-attribute
 89 KBUILD_CFLAGS += -Wmissing-include-dirs            89 KBUILD_CFLAGS += -Wmissing-include-dirs
 90 KBUILD_CFLAGS += $(call cc-option, -Wunused-co     90 KBUILD_CFLAGS += $(call cc-option, -Wunused-const-variable)
 91                                                    91 
 92 KBUILD_CPPFLAGS += -Wundef                         92 KBUILD_CPPFLAGS += -Wundef
 93 KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN1            93 KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN1
 94                                                    94 
 95 else                                               95 else
 96                                                    96 
 97 # Some diagnostics enabled by default are nois     97 # Some diagnostics enabled by default are noisy.
 98 # Suppress them by using -Wno... except for W=     98 # Suppress them by using -Wno... except for W=1.
 99 KBUILD_CFLAGS += $(call cc-disable-warning, un     99 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
100 KBUILD_CFLAGS += $(call cc-disable-warning, un    100 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
101 KBUILD_CFLAGS += $(call cc-disable-warning, pa    101 KBUILD_CFLAGS += $(call cc-disable-warning, packed-not-aligned)
102 KBUILD_CFLAGS += $(call cc-disable-warning, fo    102 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
103 ifdef CONFIG_CC_IS_GCC                            103 ifdef CONFIG_CC_IS_GCC
104 KBUILD_CFLAGS += $(call cc-disable-warning, fo    104 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
105 else                                              105 else
106 # Clang checks for overflow/truncation with '%    106 # Clang checks for overflow/truncation with '%p', while GCC does not:
107 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id    107 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111219
108 KBUILD_CFLAGS += $(call cc-disable-warning, fo    108 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow-non-kprintf)
109 KBUILD_CFLAGS += $(call cc-disable-warning, fo    109 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation-non-kprintf)
110 endif                                             110 endif
111 KBUILD_CFLAGS += $(call cc-disable-warning, st    111 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
112                                                   112 
113 KBUILD_CFLAGS += -Wno-override-init # alias fo    113 KBUILD_CFLAGS += -Wno-override-init # alias for -Wno-initializer-overrides in clang
114                                                   114 
115 ifdef CONFIG_CC_IS_CLANG                          115 ifdef CONFIG_CC_IS_CLANG
116 # Clang before clang-16 would warn on default     116 # Clang before clang-16 would warn on default argument promotions.
117 ifneq ($(call clang-min-version, 160000),y)       117 ifneq ($(call clang-min-version, 160000),y)
118 # Disable -Wformat                                118 # Disable -Wformat
119 KBUILD_CFLAGS += -Wno-format                      119 KBUILD_CFLAGS += -Wno-format
120 # Then re-enable flags that were part of the -    120 # Then re-enable flags that were part of the -Wformat group that aren't
121 # problematic.                                    121 # problematic.
122 KBUILD_CFLAGS += -Wformat-extra-args -Wformat-    122 KBUILD_CFLAGS += -Wformat-extra-args -Wformat-invalid-specifier
123 KBUILD_CFLAGS += -Wformat-zero-length -Wnonnul    123 KBUILD_CFLAGS += -Wformat-zero-length -Wnonnull
124 # Requires clang-12+.                             124 # Requires clang-12+.
125 ifeq ($(call clang-min-version, 120000),y)        125 ifeq ($(call clang-min-version, 120000),y)
126 KBUILD_CFLAGS += -Wformat-insufficient-args       126 KBUILD_CFLAGS += -Wformat-insufficient-args
127 endif                                             127 endif
128 endif                                             128 endif
129 KBUILD_CFLAGS += $(call cc-disable-warning, po    129 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-to-enum-cast)
130 KBUILD_CFLAGS += -Wno-tautological-constant-ou    130 KBUILD_CFLAGS += -Wno-tautological-constant-out-of-range-compare
131 KBUILD_CFLAGS += $(call cc-disable-warning, un    131 KBUILD_CFLAGS += $(call cc-disable-warning, unaligned-access)
132 KBUILD_CFLAGS += -Wno-enum-compare-conditional    132 KBUILD_CFLAGS += -Wno-enum-compare-conditional
133 KBUILD_CFLAGS += -Wno-enum-enum-conversion        133 KBUILD_CFLAGS += -Wno-enum-enum-conversion
134 endif                                             134 endif
135                                                   135 
136 endif                                             136 endif
137                                                   137 
138 #                                                 138 #
139 # W=2 - warnings which occur quite often but m    139 # W=2 - warnings which occur quite often but may still be relevant
140 #                                                 140 #
141 ifneq ($(findstring 2, $(KBUILD_EXTRA_WARN)),)    141 ifneq ($(findstring 2, $(KBUILD_EXTRA_WARN)),)
142                                                   142 
143 KBUILD_CFLAGS += -Wdisabled-optimization          143 KBUILD_CFLAGS += -Wdisabled-optimization
144 KBUILD_CFLAGS += -Wshadow                         144 KBUILD_CFLAGS += -Wshadow
145 KBUILD_CFLAGS += $(call cc-option, -Wlogical-o    145 KBUILD_CFLAGS += $(call cc-option, -Wlogical-op)
146 KBUILD_CFLAGS += $(call cc-option, -Wunused-ma    146 KBUILD_CFLAGS += $(call cc-option, -Wunused-macros)
147                                                   147 
148 KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN2           148 KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN2
149                                                   149 
150 else                                              150 else
151                                                   151 
152 # The following turn off the warnings enabled     152 # The following turn off the warnings enabled by -Wextra
153 KBUILD_CFLAGS += -Wno-missing-field-initialize    153 KBUILD_CFLAGS += -Wno-missing-field-initializers
154 KBUILD_CFLAGS += -Wno-type-limits                 154 KBUILD_CFLAGS += -Wno-type-limits
155 KBUILD_CFLAGS += -Wno-shift-negative-value        155 KBUILD_CFLAGS += -Wno-shift-negative-value
156                                                   156 
157 ifdef CONFIG_CC_IS_GCC                            157 ifdef CONFIG_CC_IS_GCC
158 KBUILD_CFLAGS += -Wno-maybe-uninitialized         158 KBUILD_CFLAGS += -Wno-maybe-uninitialized
159 endif                                             159 endif
160                                                   160 
161 endif                                             161 endif
162                                                   162 
163 #                                                 163 #
164 # W=3 - more obscure warnings, can most likely    164 # W=3 - more obscure warnings, can most likely be ignored
165 #                                                 165 #
166 ifneq ($(findstring 3, $(KBUILD_EXTRA_WARN)),)    166 ifneq ($(findstring 3, $(KBUILD_EXTRA_WARN)),)
167                                                   167 
168 KBUILD_CFLAGS += -Wbad-function-cast              168 KBUILD_CFLAGS += -Wbad-function-cast
169 KBUILD_CFLAGS += -Wcast-align                     169 KBUILD_CFLAGS += -Wcast-align
170 KBUILD_CFLAGS += -Wcast-qual                      170 KBUILD_CFLAGS += -Wcast-qual
171 KBUILD_CFLAGS += -Wconversion                     171 KBUILD_CFLAGS += -Wconversion
172 KBUILD_CFLAGS += -Wpacked                         172 KBUILD_CFLAGS += -Wpacked
173 KBUILD_CFLAGS += -Wpadded                         173 KBUILD_CFLAGS += -Wpadded
174 KBUILD_CFLAGS += -Wpointer-arith                  174 KBUILD_CFLAGS += -Wpointer-arith
175 KBUILD_CFLAGS += -Wredundant-decls                175 KBUILD_CFLAGS += -Wredundant-decls
176 KBUILD_CFLAGS += -Wsign-compare                   176 KBUILD_CFLAGS += -Wsign-compare
177 KBUILD_CFLAGS += -Wswitch-default                 177 KBUILD_CFLAGS += -Wswitch-default
178                                                   178 
179 KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN3           179 KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN3
180                                                   180 
181 else                                              181 else
182                                                   182 
183 # The following turn off the warnings enabled     183 # The following turn off the warnings enabled by -Wextra
184 KBUILD_CFLAGS += -Wno-sign-compare                184 KBUILD_CFLAGS += -Wno-sign-compare
185 KBUILD_CFLAGS += -Wno-unused-parameter            185 KBUILD_CFLAGS += -Wno-unused-parameter
186                                                   186 
187 endif                                             187 endif
188                                                   188 
189 #                                                 189 #
190 # W=e - error out on warnings                     190 # W=e - error out on warnings
191 #                                                 191 #
192 ifneq ($(findstring e, $(KBUILD_EXTRA_WARN)),)    192 ifneq ($(findstring e, $(KBUILD_EXTRA_WARN)),)
193                                                   193 
194 KBUILD_CFLAGS += -Werror                          194 KBUILD_CFLAGS += -Werror
195                                                   195 
196 endif                                             196 endif
                                                      

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