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 KBUILD_CFLAGS += $(call cc-disable-warning, packed-not-aligned)
  15
  16 ifeq ("$(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 += -Wmissing-prototypes
  27 warning-1 += -Wold-style-definition
  28 warning-1 += -Wmissing-include-dirs
  29 warning-1 += $(call cc-option, -Wunused-but-set-variable)
  30 warning-1 += $(call cc-option, -Wunused-const-variable)
  31 warning-1 += $(call cc-option, -Wpacked-not-aligned)
  32 warning-1 += $(call cc-option, -Wstringop-truncation)
  33 # The following turn off the warnings enabled by -Wextra
  34 warning-1 += -Wno-missing-field-initializers
  35 warning-1 += -Wno-sign-compare
  36
  37 warning-2 += -Wcast-align
  38 warning-2 += -Wdisabled-optimization
  39 warning-2 += -Wnested-externs
  40 warning-2 += -Wshadow
  41 warning-2 += $(call cc-option, -Wlogical-op)
  42 warning-2 += -Wmissing-field-initializers
  43 warning-2 += -Wsign-compare
  44 warning-2 += $(call cc-option, -Wmaybe-uninitialized)
  45 warning-2 += $(call cc-option, -Wunused-macros)
  46
  47 warning-3 := -Wbad-function-cast
  48 warning-3 += -Wcast-qual
  49 warning-3 += -Wconversion
  50 warning-3 += -Wpacked
  51 warning-3 += -Wpadded
  52 warning-3 += -Wpointer-arith
  53 warning-3 += -Wredundant-decls
  54 warning-3 += -Wswitch-default
  55 warning-3 += $(call cc-option, -Wpacked-bitfield-compat)
  56
  57 warning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
  58 warning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
  59 warning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
  60
  61 ifeq ("$(strip $(warning))","")
  62         $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown)
  63 endif
  64
  65 KBUILD_CFLAGS += $(warning)
  66 else
  67
  68 ifdef CONFIG_CC_IS_CLANG
  69 KBUILD_CFLAGS += -Wno-initializer-overrides
  70 KBUILD_CFLAGS += -Wno-format
  71 KBUILD_CFLAGS += -Wno-sign-compare
  72 KBUILD_CFLAGS += -Wno-format-zero-length
  73 endif
  74 endif