1# SPDX-License-Identifier: GPL-2.0
 2# ==========================================================================
 
 3# make W=... settings
 4#
 5# There are three warning groups enabled by W=1, W=2, W=3.
 6# They are independent, and can be combined like W=12 or W=123.
 
 
 
 
 7# ==========================================================================
 8
 9KBUILD_CFLAGS += $(call cc-disable-warning, packed-not-aligned)
10
11# backward compatibility
12KBUILD_EXTRA_WARN ?= $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)
13
14ifeq ("$(origin W)", "command line")
15  KBUILD_EXTRA_WARN := $(W)
16endif
17
18export KBUILD_EXTRA_WARN
19
20#
21# W=1 - warnings which may be relevant and do not occur too often
22#
23ifneq ($(findstring 1, $(KBUILD_EXTRA_WARN)),)
24
25KBUILD_CFLAGS += -Wextra -Wunused -Wno-unused-parameter
26KBUILD_CFLAGS += -Wmissing-declarations
27KBUILD_CFLAGS += -Wmissing-format-attribute
28KBUILD_CFLAGS += -Wmissing-prototypes
29KBUILD_CFLAGS += -Wold-style-definition
30KBUILD_CFLAGS += -Wmissing-include-dirs
31KBUILD_CFLAGS += $(call cc-option, -Wunused-but-set-variable)
32KBUILD_CFLAGS += $(call cc-option, -Wunused-const-variable)
33KBUILD_CFLAGS += $(call cc-option, -Wpacked-not-aligned)
34KBUILD_CFLAGS += $(call cc-option, -Wstringop-truncation)
35# The following turn off the warnings enabled by -Wextra
36KBUILD_CFLAGS += -Wno-missing-field-initializers
37KBUILD_CFLAGS += -Wno-sign-compare
38KBUILD_CFLAGS += -Wno-type-limits
39
40KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN1
41
42else
43
44# Some diagnostics enabled by default are noisy.
45# Suppress them by using -Wno... except for W=1.
46
47ifdef CONFIG_CC_IS_CLANG
48KBUILD_CFLAGS += -Wno-initializer-overrides
49KBUILD_CFLAGS += -Wno-format
50KBUILD_CFLAGS += -Wno-sign-compare
51KBUILD_CFLAGS += -Wno-format-zero-length
52KBUILD_CFLAGS += $(call cc-disable-warning, pointer-to-enum-cast)
53KBUILD_CFLAGS += -Wno-tautological-constant-out-of-range-compare
54endif
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
55
 
 
56endif
57
58#
59# W=2 - warnings which occur quite often but may still be relevant
60#
61ifneq ($(findstring 2, $(KBUILD_EXTRA_WARN)),)
62
63KBUILD_CFLAGS += -Wdisabled-optimization
64KBUILD_CFLAGS += -Wshadow
65KBUILD_CFLAGS += $(call cc-option, -Wlogical-op)
66KBUILD_CFLAGS += -Wmissing-field-initializers
67KBUILD_CFLAGS += -Wtype-limits
68KBUILD_CFLAGS += $(call cc-option, -Wmaybe-uninitialized)
69KBUILD_CFLAGS += $(call cc-option, -Wunused-macros)
70
71KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN2
72
 
 
 
 
 
 
 
 
73endif
74
75#
76# W=3 - more obscure warnings, can most likely be ignored
77#
78ifneq ($(findstring 3, $(KBUILD_EXTRA_WARN)),)
79
80KBUILD_CFLAGS += -Wbad-function-cast
81KBUILD_CFLAGS += -Wcast-align
82KBUILD_CFLAGS += -Wcast-qual
83KBUILD_CFLAGS += -Wconversion
84KBUILD_CFLAGS += -Wpacked
85KBUILD_CFLAGS += -Wpadded
86KBUILD_CFLAGS += -Wpointer-arith
87KBUILD_CFLAGS += -Wredundant-decls
88KBUILD_CFLAGS += -Wsign-compare
89KBUILD_CFLAGS += -Wswitch-default
90KBUILD_CFLAGS += $(call cc-option, -Wpacked-bitfield-compat)
91
92KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN3
93
94endif

 
 1# ==========================================================================
 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-option, -Wunused-const-variable)
28warning-1 += $(call cc-disable-warning, missing-field-initializers)
29warning-1 += $(call cc-disable-warning, sign-compare)
30
31warning-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)
38warning-2 += $(call cc-option, -Wsign-compare)
39warning-2 += $(call cc-option, -Wmaybe-uninitialized)
40
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)
61else
 
 
 
 
 
 
 
 
 
 
 
 
62
63ifeq ($(cc-name),clang)
64KBUILD_CFLAGS += $(call cc-disable-warning, initializer-overrides)
65KBUILD_CFLAGS += $(call cc-disable-warning, unused-value)
66KBUILD_CFLAGS += $(call cc-disable-warning, format)
67KBUILD_CFLAGS += $(call cc-disable-warning, unknown-warning-option)
68KBUILD_CFLAGS += $(call cc-disable-warning, sign-compare)
69KBUILD_CFLAGS += $(call cc-disable-warning, format-zero-length)
70KBUILD_CFLAGS += $(call cc-disable-warning, uninitialized)
71endif
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
72endif