blob: fb3522fd87029f8e841469d2bb300ef6eb7fe1cb [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# $(call cc-option, -W...) handles gcc -W.. options which
10# are not supported by all versions of the compiler
11# ==========================================================================
12
13ifeq ("$(origin W)", "command line")
14 export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
15endif
16
17ifdef KBUILD_ENABLE_EXTRA_GCC_CHECKS
18warning- := $(empty)
19
20warning-1 := -Wextra -Wunused -Wno-unused-parameter
21warning-1 += -Wmissing-declarations
22warning-1 += -Wmissing-format-attribute
23warning-1 += $(call cc-option, -Wmissing-prototypes)
24warning-1 += -Wold-style-definition
25warning-1 += $(call cc-option, -Wmissing-include-dirs)
26warning-1 += $(call cc-option, -Wunused-but-set-variable)
Arnd Bergmannc9c68372016-05-10 23:30:01 +020027warning-1 += $(call cc-option, -Wunused-const-variable)
Masahiro Yamadaa86fe352014-04-14 18:27:10 +090028warning-1 += $(call cc-disable-warning, missing-field-initializers)
Lee Jones7599ea82016-01-12 14:24:18 +000029warning-1 += $(call cc-disable-warning, sign-compare)
Masahiro Yamadaa86fe352014-04-14 18:27:10 +090030
Masahiro Yamadaa86fe352014-04-14 18:27:10 +090031warning-2 := -Waggregate-return
32warning-2 += -Wcast-align
33warning-2 += -Wdisabled-optimization
34warning-2 += -Wnested-externs
35warning-2 += -Wshadow
36warning-2 += $(call cc-option, -Wlogical-op)
37warning-2 += $(call cc-option, -Wmissing-field-initializers)
Lee Jones7599ea82016-01-12 14:24:18 +000038warning-2 += $(call cc-option, -Wsign-compare)
Arnd Bergmanna76bcf52016-11-10 17:44:44 +010039warning-2 += $(call cc-option, -Wmaybe-uninitialized)
Masahiro Yamadaa86fe352014-04-14 18:27:10 +090040
41warning-3 := -Wbad-function-cast
42warning-3 += -Wcast-qual
43warning-3 += -Wconversion
44warning-3 += -Wpacked
45warning-3 += -Wpadded
46warning-3 += -Wpointer-arith
47warning-3 += -Wredundant-decls
48warning-3 += -Wswitch-default
49warning-3 += $(call cc-option, -Wpacked-bitfield-compat)
50warning-3 += $(call cc-option, -Wvla)
51
52warning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
53warning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
54warning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
55
56ifeq ("$(strip $(warning))","")
57 $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown)
58endif
59
60KBUILD_CFLAGS += $(warning)
Behan Webster26ea6bb2014-07-31 21:08:25 -070061else
62
Michal Marek5631d9c2015-08-19 17:36:41 +020063ifeq ($(cc-name),clang)
Behan Webster26ea6bb2014-07-31 21:08:25 -070064KBUILD_CFLAGS += $(call cc-disable-warning, initializer-overrides)
65KBUILD_CFLAGS += $(call cc-disable-warning, unused-value)
66KBUILD_CFLAGS += $(call cc-disable-warning, format)
Behan Webster26ea6bb2014-07-31 21:08:25 -070067KBUILD_CFLAGS += $(call cc-disable-warning, sign-compare)
68KBUILD_CFLAGS += $(call cc-disable-warning, format-zero-length)
69KBUILD_CFLAGS += $(call cc-disable-warning, uninitialized)
70endif
Masahiro Yamadaa86fe352014-04-14 18:27:10 +090071endif