1# SPDX-License-Identifier: GPL-2.0
2# ==========================================================================
3#
4# make W=... settings
5#
6# W=1 - warnings that may be relevant and does not occur too often
7# W=2 - warnings that occur quite often but may still be relevant
8# W=3 - the more obscure warnings, can most likely be ignored
9#
10# $(call cc-option, -W...) handles gcc -W.. options which
11# are not supported by all versions of the compiler
12# ==========================================================================
13
14KBUILD_CFLAGS += $(call cc-disable-warning, packed-not-aligned)
15
16KBUILD_CPPFLAGS-$(CONFIG_WERROR) += -Werror
17KBUILD_CPPFLAGS += $(KBUILD_CPPFLAGS-y)
18
19ifeq ("$(origin W)", "command line")
20  export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
21endif
22
23ifdef KBUILD_ENABLE_EXTRA_GCC_CHECKS
24warning-  := $(empty)
25
26warning-1 := -Wextra -Wunused -Wno-unused-parameter
27warning-1 += -Wmissing-declarations
28warning-1 += -Wmissing-format-attribute
29warning-1 += $(call cc-option, -Wmissing-prototypes)
30warning-1 += -Wold-style-definition
31warning-1 += $(call cc-option, -Wmissing-include-dirs)
32warning-1 += $(call cc-option, -Wunused-but-set-variable)
33warning-1 += $(call cc-option, -Wunused-const-variable)
34warning-1 += $(call cc-option, -Wpacked-not-aligned)
35warning-1 += $(call cc-option, -Wstringop-truncation)
36warning-1 += $(call cc-disable-warning, missing-field-initializers)
37warning-1 += $(call cc-disable-warning, sign-compare)
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)
46warning-2 += $(call cc-option, -Wsign-compare)
47warning-2 += $(call cc-option, -Wmaybe-uninitialized)
48warning-2 += $(call cc-option, -Wunused-macros)
49
50warning-3 := -Wbad-function-cast
51warning-3 += -Wcast-qual
52warning-3 += -Wconversion
53warning-3 += -Wpacked
54warning-3 += -Wpadded
55warning-3 += -Wpointer-arith
56warning-3 += -Wredundant-decls
57warning-3 += -Wswitch-default
58warning-3 += $(call cc-option, -Wpacked-bitfield-compat)
59warning-3 += $(call cc-option, -Wvla)
60
61warning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
62warning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
63warning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
64
65ifeq ("$(strip $(warning))","")
66        $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown)
67endif
68
69KBUILD_CFLAGS += $(warning)
70else
71
72ifdef CONFIG_CC_IS_CLANG
73KBUILD_CFLAGS += $(call cc-disable-warning, initializer-overrides)
74KBUILD_CFLAGS += $(call cc-disable-warning, unused-value)
75KBUILD_CFLAGS += $(call cc-disable-warning, format)
76KBUILD_CFLAGS += $(call cc-disable-warning, sign-compare)
77KBUILD_CFLAGS += $(call cc-disable-warning, format-zero-length)
78KBUILD_CFLAGS += $(call cc-disable-warning, uninitialized)
79endif
80endif
81