1b2441318SGreg Kroah-Hartman# SPDX-License-Identifier: GPL-2.0 2a86fe353SMasahiro Yamada# ========================================================================== 3a86fe353SMasahiro Yamada# make W=... settings 4a86fe353SMasahiro Yamada# 564a91907SMasahiro Yamada# There are three warning groups enabled by W=1, W=2, W=3. 664a91907SMasahiro Yamada# They are independent, and can be combined like W=12 or W=123. 7a86fe353SMasahiro Yamada# ========================================================================== 8a86fe353SMasahiro Yamada 9321cb030SXiongfeng WangKBUILD_CFLAGS += $(call cc-disable-warning, packed-not-aligned) 10321cb030SXiongfeng Wang 11e27128dbSMasahiro Yamada# backward compatibility 12e27128dbSMasahiro YamadaKBUILD_EXTRA_WARN ?= $(KBUILD_ENABLE_EXTRA_GCC_CHECKS) 13e27128dbSMasahiro Yamada 14a86fe353SMasahiro Yamadaifeq ("$(origin W)", "command line") 15e27128dbSMasahiro Yamada KBUILD_EXTRA_WARN := $(W) 16a86fe353SMasahiro Yamadaendif 17a86fe353SMasahiro Yamada 18e27128dbSMasahiro Yamadaexport KBUILD_EXTRA_WARN 19e27128dbSMasahiro Yamada 2064a91907SMasahiro Yamada# 2164a91907SMasahiro Yamada# W=1 - warnings which may be relevant and do not occur too often 2264a91907SMasahiro Yamada# 23e27128dbSMasahiro Yamadaifneq ($(findstring 1, $(KBUILD_EXTRA_WARN)),) 24a86fe353SMasahiro Yamada 2564a91907SMasahiro YamadaKBUILD_CFLAGS += -Wextra -Wunused -Wno-unused-parameter 2664a91907SMasahiro YamadaKBUILD_CFLAGS += -Wmissing-declarations 2764a91907SMasahiro YamadaKBUILD_CFLAGS += -Wmissing-format-attribute 2864a91907SMasahiro YamadaKBUILD_CFLAGS += -Wmissing-prototypes 2964a91907SMasahiro YamadaKBUILD_CFLAGS += -Wold-style-definition 3064a91907SMasahiro YamadaKBUILD_CFLAGS += -Wmissing-include-dirs 3164a91907SMasahiro YamadaKBUILD_CFLAGS += $(call cc-option, -Wunused-but-set-variable) 3264a91907SMasahiro YamadaKBUILD_CFLAGS += $(call cc-option, -Wunused-const-variable) 3364a91907SMasahiro YamadaKBUILD_CFLAGS += $(call cc-option, -Wpacked-not-aligned) 3464a91907SMasahiro YamadaKBUILD_CFLAGS += $(call cc-option, -Wstringop-truncation) 354c8dd95aSMasahiro Yamada# The following turn off the warnings enabled by -Wextra 3664a91907SMasahiro YamadaKBUILD_CFLAGS += -Wno-missing-field-initializers 3764a91907SMasahiro YamadaKBUILD_CFLAGS += -Wno-sign-compare 38a86fe353SMasahiro Yamada 396863f564SMasahiro YamadaKBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN1 406863f564SMasahiro Yamada 4126ea6bb1SBehan Websterelse 4226ea6bb1SBehan Webster 4364a91907SMasahiro Yamada# Some diagnostics enabled by default are noisy. 4464a91907SMasahiro Yamada# Suppress them by using -Wno... except for W=1. 4564a91907SMasahiro Yamada 46076f421dSMasahiro Yamadaifdef CONFIG_CC_IS_CLANG 47a1494304SMasahiro YamadaKBUILD_CFLAGS += -Wno-initializer-overrides 48a1494304SMasahiro YamadaKBUILD_CFLAGS += -Wno-format 49a1494304SMasahiro YamadaKBUILD_CFLAGS += -Wno-sign-compare 50a1494304SMasahiro YamadaKBUILD_CFLAGS += -Wno-format-zero-length 5182f2bc2fSNathan ChancellorKBUILD_CFLAGS += $(call cc-disable-warning, pointer-to-enum-cast) 52*afe956c5SNathan ChancellorKBUILD_CFLAGS += -Wno-tautological-constant-out-of-range-compare 5326ea6bb1SBehan Websterendif 5464a91907SMasahiro Yamada 5564a91907SMasahiro Yamadaendif 5664a91907SMasahiro Yamada 5764a91907SMasahiro Yamada# 5864a91907SMasahiro Yamada# W=2 - warnings which occur quite often but may still be relevant 5964a91907SMasahiro Yamada# 60e27128dbSMasahiro Yamadaifneq ($(findstring 2, $(KBUILD_EXTRA_WARN)),) 6164a91907SMasahiro Yamada 6264a91907SMasahiro YamadaKBUILD_CFLAGS += -Wcast-align 6364a91907SMasahiro YamadaKBUILD_CFLAGS += -Wdisabled-optimization 6464a91907SMasahiro YamadaKBUILD_CFLAGS += -Wnested-externs 6564a91907SMasahiro YamadaKBUILD_CFLAGS += -Wshadow 6664a91907SMasahiro YamadaKBUILD_CFLAGS += $(call cc-option, -Wlogical-op) 6764a91907SMasahiro YamadaKBUILD_CFLAGS += -Wmissing-field-initializers 6864a91907SMasahiro YamadaKBUILD_CFLAGS += -Wsign-compare 6964a91907SMasahiro YamadaKBUILD_CFLAGS += $(call cc-option, -Wmaybe-uninitialized) 7064a91907SMasahiro YamadaKBUILD_CFLAGS += $(call cc-option, -Wunused-macros) 7164a91907SMasahiro Yamada 726863f564SMasahiro YamadaKBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN2 736863f564SMasahiro Yamada 7464a91907SMasahiro Yamadaendif 7564a91907SMasahiro Yamada 7664a91907SMasahiro Yamada# 7764a91907SMasahiro Yamada# W=3 - more obscure warnings, can most likely be ignored 7864a91907SMasahiro Yamada# 79e27128dbSMasahiro Yamadaifneq ($(findstring 3, $(KBUILD_EXTRA_WARN)),) 8064a91907SMasahiro Yamada 8164a91907SMasahiro YamadaKBUILD_CFLAGS += -Wbad-function-cast 8264a91907SMasahiro YamadaKBUILD_CFLAGS += -Wcast-qual 8364a91907SMasahiro YamadaKBUILD_CFLAGS += -Wconversion 8464a91907SMasahiro YamadaKBUILD_CFLAGS += -Wpacked 8564a91907SMasahiro YamadaKBUILD_CFLAGS += -Wpadded 8664a91907SMasahiro YamadaKBUILD_CFLAGS += -Wpointer-arith 8764a91907SMasahiro YamadaKBUILD_CFLAGS += -Wredundant-decls 8864a91907SMasahiro YamadaKBUILD_CFLAGS += -Wswitch-default 8964a91907SMasahiro YamadaKBUILD_CFLAGS += $(call cc-option, -Wpacked-bitfield-compat) 9064a91907SMasahiro Yamada 916863f564SMasahiro YamadaKBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN3 926863f564SMasahiro Yamada 93a86fe353SMasahiro Yamadaendif 94