blob: 6547e573574b0a1a03b325ddf878a8ae1275614f [file] [log] [blame]
Masahiro Yamada6419e142014-08-05 15:56:43 +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# $(call cc-option, -W...) handles gcc -W.. options which
10# are not supported by all versions of the compiler
11# ==========================================================================
Tom Rinif32c8642016-01-14 18:24:44 -050012#
13# SPDX-License-Identifier: GPL-2.0
14#
Masahiro Yamada6419e142014-08-05 15:56:43 +090015
16ifeq ("$(origin W)", "command line")
17 export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
18endif
19
20ifdef KBUILD_ENABLE_EXTRA_GCC_CHECKS
21warning- := $(empty)
22
23warning-1 := -Wextra -Wunused -Wno-unused-parameter
24warning-1 += -Wmissing-declarations
25warning-1 += -Wmissing-format-attribute
26warning-1 += $(call cc-option, -Wmissing-prototypes)
27warning-1 += -Wold-style-definition
28warning-1 += $(call cc-option, -Wmissing-include-dirs)
29warning-1 += $(call cc-option, -Wunused-but-set-variable)
30warning-1 += $(call cc-disable-warning, missing-field-initializers)
31
Masahiro Yamada6419e142014-08-05 15:56:43 +090032warning-2 := -Waggregate-return
33warning-2 += -Wcast-align
34warning-2 += -Wdisabled-optimization
35warning-2 += -Wnested-externs
36warning-2 += -Wshadow
37warning-2 += $(call cc-option, -Wlogical-op)
38warning-2 += $(call cc-option, -Wmissing-field-initializers)
39
40warning-3 := -Wbad-function-cast
41warning-3 += -Wcast-qual
42warning-3 += -Wconversion
43warning-3 += -Wpacked
44warning-3 += -Wpadded
45warning-3 += -Wpointer-arith
46warning-3 += -Wredundant-decls
47warning-3 += -Wswitch-default
48warning-3 += $(call cc-option, -Wpacked-bitfield-compat)
49warning-3 += $(call cc-option, -Wvla)
50
51warning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
52warning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
53warning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
54
55ifeq ("$(strip $(warning))","")
56 $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown)
57endif
58
59KBUILD_CFLAGS += $(warning)
60endif