# SPDX-License-Identifier: GPL-2.0# ==========================================================================## make W=... settings## W=1 - warnings that may be relevant and does not occur too often# W=2 - warnings that occur quite often but may still be relevant# W=3 - the more obscure warnings, can most likely be ignored## $(call cc-option, -W...) handles gcc -W.. options which# are not supported by all versions of the compiler# ========================================================================== KBUILD_CFLAGS += $(call cc-disable-warning, packed-not-aligned) ifeq ("$(origin W)", "command line")  export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)endif ifdef KBUILD_ENABLE_EXTRA_GCC_CHECKSwarning-  := $(empty) warning-1 := -Wextra -Wunused -Wno-unused-parameterwarning-1 += -Wmissing-declarationswarning-1 += -Wmissing-format-attributewarning-1 += -Wmissing-prototypeswarning-1 += -Wold-style-definitionwarning-1 += -Wmissing-include-dirswarning-1 += $(call cc-option, -Wunused-but-set-variable)warning-1 += $(call cc-option, -Wunused-const-variable)warning-1 += $(call cc-option, -Wpacked-not-aligned)warning-1 += $(call cc-option, -Wstringop-truncation)# The following turn off the warnings enabled by -Wextrawarning-1 += -Wno-missing-field-initializerswarning-1 += -Wno-sign-compare warning-2 += -Wcast-alignwarning-2 += -Wdisabled-optimizationwarning-2 += -Wnested-externswarning-2 += -Wshadowwarning-2 += $(call cc-option, -Wlogical-op)warning-2 += -Wmissing-field-initializerswarning-2 += -Wsign-comparewarning-2 += $(call cc-option, -Wmaybe-uninitialized)warning-2 += $(call cc-option, -Wunused-macros) warning-3 := -Wbad-function-castwarning-3 += -Wcast-qualwarning-3 += -Wconversionwarning-3 += -Wpackedwarning-3 += -Wpaddedwarning-3 += -Wpointer-arithwarning-3 += -Wredundant-declswarning-3 += -Wswitch-defaultwarning-3 += $(call cc-option, -Wpacked-bitfield-compat) warning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))warning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))warning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) ifeq ("$(strip $(warning))","")        $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown)endif KBUILD_CFLAGS += $(warning)else ifdef CONFIG_CC_IS_CLANGKBUILD_CFLAGS += -Wno-initializer-overridesKBUILD_CFLAGS += -Wno-formatKBUILD_CFLAGS += -Wno-sign-compareKBUILD_CFLAGS += -Wno-format-zero-lengthendifendif