scripts/Makefile.extrawarn

   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 # $(call cc-option, -W...) handles gcc -W.. options which
  10 # are not supported by all versions of the compiler
  11 # ==========================================================================
  12 #
  13 # SPDX-License-Identifier:      GPL-2.0
  14 #
  15
  16 ifeq ("$(origin W)", "command line")
  17   export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
  18 endif
  19
  20 ifdef KBUILD_ENABLE_EXTRA_GCC_CHECKS
  21 warning-  := $(empty)
  22
  23 warning-1 := -Wextra -Wunused -Wno-unused-parameter
  24 warning-1 += -Wmissing-declarations
  25 warning-1 += -Wmissing-format-attribute
  26 warning-1 += $(call cc-option, -Wmissing-prototypes)
  27 warning-1 += -Wold-style-definition
  28 warning-1 += $(call cc-option, -Wmissing-include-dirs)
  29 warning-1 += $(call cc-option, -Wunused-but-set-variable)
  30 warning-1 += $(call cc-disable-warning, missing-field-initializers)
  31
  32 warning-2 := -Waggregate-return
  33 warning-2 += -Wcast-align
  34 warning-2 += -Wdisabled-optimization
  35 warning-2 += -Wnested-externs
  36 warning-2 += -Wshadow
  37 warning-2 += $(call cc-option, -Wlogical-op)
  38 warning-2 += $(call cc-option, -Wmissing-field-initializers)
  39
  40 warning-3 := -Wbad-function-cast
  41 warning-3 += -Wcast-qual
  42 warning-3 += -Wconversion
  43 warning-3 += -Wpacked
  44 warning-3 += -Wpadded
  45 warning-3 += -Wpointer-arith
  46 warning-3 += -Wredundant-decls
  47 warning-3 += -Wswitch-default
  48 warning-3 += $(call cc-option, -Wpacked-bitfield-compat)
  49 warning-3 += $(call cc-option, -Wvla)
  50
  51 warning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
  52 warning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
  53 warning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
  54
  55 ifeq ("$(strip $(warning))","")
  56         $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown)
  57 endif
  58
  59 KBUILD_CFLAGS += $(warning)
  60
  61 dtc-warning-2 += $(call dtc-option,-Wnode_name_chars_strict)
  62 dtc-warning-2 += $(call dtc-option,-Wproperty_name_chars_strict)
  63
  64 dtc-warning := $(dtc-warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
  65 dtc-warning += $(dtc-warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
  66 dtc-warning += $(dtc-warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
  67
  68 DTC_FLAGS += $(dtc-warning)
  69
  70 else
  71
  72 # Disable noisy checks by default
  73 DTC_FLAGS += $(call dtc-option,-Wno-unit_address_vs_reg)
  74 DTC_FLAGS += $(call dtc-option,-Wno-simple_bus_reg)
  75 DTC_FLAGS += $(call dtc-option,-Wno-unit_address_format)
  76 DTC_FLAGS += $(call dtc-option,-Wno-pci_bridge)
  77 DTC_FLAGS += $(call dtc-option,-Wno-pci_device_bus_num)
  78 DTC_FLAGS += $(call dtc-option,-Wno-pci_device_reg)
  79
  80 endif