blob: e823bf6a413cbef836ebb943c7d660fd46c3ef8e [file] [log] [blame]
Masahiro Yamadaa86fe352014-04-14 18:27:10 +09001# ==========================================================================
2#
3# make W=... settings
4#
5# W=1 - warnings that may be relevant and does not occur too often
6# W=2 - warnings that occur quite often but may still be relevant
7# W=3 - the more obscure warnings, can most likely be ignored
8#
9# $(call cc-option, -W...) handles gcc -W.. options which
10# are not supported by all versions of the compiler
11# ==========================================================================
12
Xiongfeng Wangdfb64b82018-01-11 17:22:29 +080013KBUILD_CFLAGS += $(call cc-disable-warning, packed-not-aligned)
14
Masahiro Yamadaa86fe352014-04-14 18:27:10 +090015ifeq ("$(origin W)", "command line")
16 export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
17endif
18
19ifdef KBUILD_ENABLE_EXTRA_GCC_CHECKS
20warning- := $(empty)
21
22warning-1 := -Wextra -Wunused -Wno-unused-parameter
23warning-1 += -Wmissing-declarations
24warning-1 += -Wmissing-format-attribute
25warning-1 += $(call cc-option, -Wmissing-prototypes)
26warning-1 += -Wold-style-definition
27warning-1 += $(call cc-option, -Wmissing-include-dirs)
28warning-1 += $(call cc-option, -Wunused-but-set-variable)
Arnd Bergmannc9c68372016-05-10 23:30:01 +020029warning-1 += $(call cc-option, -Wunused-const-variable)
Xiongfeng Wangdfb64b82018-01-11 17:22:29 +080030warning-1 += $(call cc-option, -Wpacked-not-aligned)
Masahiro Yamadaa86fe352014-04-14 18:27:10 +090031warning-1 += $(call cc-disable-warning, missing-field-initializers)
Lee Jones7599ea82016-01-12 14:24:18 +000032warning-1 += $(call cc-disable-warning, sign-compare)
Masahiro Yamadaa86fe352014-04-14 18:27:10 +090033
Masahiro Yamadaa86fe352014-04-14 18:27:10 +090034warning-2 := -Waggregate-return
35warning-2 += -Wcast-align
36warning-2 += -Wdisabled-optimization
37warning-2 += -Wnested-externs
38warning-2 += -Wshadow
39warning-2 += $(call cc-option, -Wlogical-op)
40warning-2 += $(call cc-option, -Wmissing-field-initializers)
Lee Jones7599ea82016-01-12 14:24:18 +000041warning-2 += $(call cc-option, -Wsign-compare)
Arnd Bergmanna76bcf52016-11-10 17:44:44 +010042warning-2 += $(call cc-option, -Wmaybe-uninitialized)
Masahiro Yamadaa86fe352014-04-14 18:27:10 +090043
44warning-3 := -Wbad-function-cast
45warning-3 += -Wcast-qual
46warning-3 += -Wconversion
47warning-3 += -Wpacked
48warning-3 += -Wpadded
49warning-3 += -Wpointer-arith
50warning-3 += -Wredundant-decls
51warning-3 += -Wswitch-default
52warning-3 += $(call cc-option, -Wpacked-bitfield-compat)
53warning-3 += $(call cc-option, -Wvla)
54
55warning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
56warning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
57warning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
58
59ifeq ("$(strip $(warning))","")
60 $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown)
61endif
62
63KBUILD_CFLAGS += $(warning)
Behan Webster26ea6bb2014-07-31 21:08:25 -070064else
65
Michal Marek5631d9c2015-08-19 17:36:41 +020066ifeq ($(cc-name),clang)
Behan Webster26ea6bb2014-07-31 21:08:25 -070067KBUILD_CFLAGS += $(call cc-disable-warning, initializer-overrides)
68KBUILD_CFLAGS += $(call cc-disable-warning, unused-value)
69KBUILD_CFLAGS += $(call cc-disable-warning, format)
Behan Webster26ea6bb2014-07-31 21:08:25 -070070KBUILD_CFLAGS += $(call cc-disable-warning, sign-compare)
71KBUILD_CFLAGS += $(call cc-disable-warning, format-zero-length)
72KBUILD_CFLAGS += $(call cc-disable-warning, uninitialized)
Nathan Chancellor3251c972020-03-11 12:41:21 -070073KBUILD_CFLAGS += $(call cc-disable-warning, pointer-to-enum-cast)
Nathan Chancellor4bc7e762022-02-02 16:05:16 -070074KBUILD_CFLAGS += $(call cc-disable-warning, unaligned-access)
Behan Webster26ea6bb2014-07-31 21:08:25 -070075endif
Masahiro Yamadaa86fe352014-04-14 18:27:10 +090076endif