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