scripts/Makefile.extrawarn

   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 # $(call cc-option, -W...) handles gcc -W.. options which
  11 # are not supported by all versions of the compiler
  12 # ==========================================================================
  13
  14 ifeq ("$(origin W)", "command line")
  15   export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
  16 endif
  17
  18 ifdef KBUILD_ENABLE_EXTRA_GCC_CHECKS
  19 warning-  := $(empty)
  20
  21 warning-1 := -Wextra -Wunused -Wno-unused-parameter
  22 warning-1 += -Wmissing-declarations
  23 warning-1 += -Wmissing-format-attribute
  24 warning-1 += $(call cc-option, -Wmissing-prototypes)
  25 warning-1 += -Wold-style-definition
  26 warning-1 += $(call cc-option, -Wmissing-include-dirs)
  27 warning-1 += $(call cc-option, -Wunused-but-set-variable)
  28 warning-1 += $(call cc-option, -Wunused-const-variable)
  29 warning-1 += $(call cc-disable-warning, missing-field-initializers)
  30 warning-1 += $(call cc-disable-warning, sign-compare)
  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 warning-2 += $(call cc-option, -Wsign-compare)
  40 warning-2 += $(call cc-option, -Wmaybe-uninitialized)
  41 warning-2 += $(call cc-option, -Wunused-macros)
  42
  43 warning-3 := -Wbad-function-cast
  44 warning-3 += -Wcast-qual
  45 warning-3 += -Wconversion
  46 warning-3 += -Wpacked
  47 warning-3 += -Wpadded
  48 warning-3 += -Wpointer-arith
  49 warning-3 += -Wredundant-decls
  50 warning-3 += -Wswitch-default
  51 warning-3 += $(call cc-option, -Wpacked-bitfield-compat)
  52 warning-3 += $(call cc-option, -Wvla)
  53
  54 warning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
  55 warning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
  56 warning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
  57
  58 ifeq ("$(strip $(warning))","")
  59         $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown)
  60 endif
  61
  62 KBUILD_CFLAGS += $(warning)
  63 else
  64
  65 ifeq ($(cc-name),clang)
  66 KBUILD_CFLAGS += $(call cc-disable-warning, initializer-overrides)
  67 KBUILD_CFLAGS += $(call cc-disable-warning, unused-value)
  68 KBUILD_CFLAGS += $(call cc-disable-warning, format)
  69 KBUILD_CFLAGS += $(call cc-disable-warning, sign-compare)
  70 KBUILD_CFLAGS += $(call cc-disable-warning, format-zero-length)
  71 KBUILD_CFLAGS += $(call cc-disable-warning, uninitialized)
  72 endif
  73 endif