# 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_CHECKS
  warning-  := $(empty)
  
  warning-1 := -Wextra -Wunused -Wno-unused-parameter
  warning-1 += -Wmissing-declarations
  warning-1 += -Wmissing-format-attribute

  warning-1 += -Wmissing-prototypes

  warning-1 += -Wold-style-definition

  warning-1 += -Wmissing-include-dirs

  warning-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 -Wextra
  warning-1 += -Wno-missing-field-initializers
  warning-1 += -Wno-sign-compare

  warning-2 := -Waggregate-return
  warning-2 += -Wcast-align
  warning-2 += -Wdisabled-optimization
  warning-2 += -Wnested-externs
  warning-2 += -Wshadow
  warning-2 += $(call cc-option, -Wlogical-op)

  warning-2 += -Wmissing-field-initializers
  warning-2 += -Wsign-compare

  warning-2 += $(call cc-option, -Wmaybe-uninitialized)

  warning-2 += $(call cc-option, -Wunused-macros)

  
  warning-3 := -Wbad-function-cast
  warning-3 += -Wcast-qual
  warning-3 += -Wconversion
  warning-3 += -Wpacked
  warning-3 += -Wpadded
  warning-3 += -Wpointer-arith
  warning-3 += -Wredundant-decls
  warning-3 += -Wswitch-default
  warning-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_CLANG

  KBUILD_CFLAGS += -Wno-initializer-overrides
  KBUILD_CFLAGS += -Wno-unused-value
  KBUILD_CFLAGS += -Wno-format
  KBUILD_CFLAGS += -Wno-sign-compare
  KBUILD_CFLAGS += -Wno-format-zero-length
  KBUILD_CFLAGS += -Wno-uninitialized

  endif

  endif