blob: 65643506c71c7c03c9f6ad82944f955a14109815 [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)
27warning-1 += $(call cc-disable-warning, missing-field-initializers)
28
29# Clang
30warning-1 += $(call cc-disable-warning, initializer-overrides)
31warning-1 += $(call cc-disable-warning, unused-value)
32warning-1 += $(call cc-disable-warning, format)
33warning-1 += $(call cc-disable-warning, unknown-warning-option)
34warning-1 += $(call cc-disable-warning, sign-compare)
35warning-1 += $(call cc-disable-warning, format-zero-length)
36warning-1 += $(call cc-disable-warning, uninitialized)
37warning-1 += $(call cc-option, -fcatch-undefined-behavior)
38
39warning-2 := -Waggregate-return
40warning-2 += -Wcast-align
41warning-2 += -Wdisabled-optimization
42warning-2 += -Wnested-externs
43warning-2 += -Wshadow
44warning-2 += $(call cc-option, -Wlogical-op)
45warning-2 += $(call cc-option, -Wmissing-field-initializers)
46
47warning-3 := -Wbad-function-cast
48warning-3 += -Wcast-qual
49warning-3 += -Wconversion
50warning-3 += -Wpacked
51warning-3 += -Wpadded
52warning-3 += -Wpointer-arith
53warning-3 += -Wredundant-decls
54warning-3 += -Wswitch-default
55warning-3 += $(call cc-option, -Wpacked-bitfield-compat)
56warning-3 += $(call cc-option, -Wvla)
57
58warning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
59warning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
60warning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
61
62ifeq ("$(strip $(warning))","")
63 $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown)
64endif
65
66KBUILD_CFLAGS += $(warning)
67endif