1 # ==========================================================================
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
9 # $(call cc-option, -W...) handles gcc -W.. options which
10 # are not supported by all versions of the compiler
11 # ==========================================================================
13 # SPDX-License-Identifier: GPL-2.0
16 ifeq ("$(origin W)", "command line")
17 export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
20 ifdef KBUILD_ENABLE_EXTRA_GCC_CHECKS
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)
32 warning-2 := -Waggregate-return
33 warning-2 += -Wcast-align
34 warning-2 += -Wdisabled-optimization
35 warning-2 += -Wnested-externs
37 warning-2 += $(call cc-option, -Wlogical-op)
38 warning-2 += $(call cc-option, -Wmissing-field-initializers)
40 warning-3 := -Wbad-function-cast
41 warning-3 += -Wcast-qual
42 warning-3 += -Wconversion
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)
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, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
55 ifeq ("$(strip $(warning))","")
56 $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown)
59 KBUILD_CFLAGS += $(warning)
63 # Disable noisy checks by default
64 DTC_FLAGS += $(call dtc-option,-Wno-unit_address_vs_reg)