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# $(call cc-option, -W...) handles gcc -W.. options which 10# are not supported by all versions of the compiler 11# ========================================================================== 12# 13# SPDX-License-Identifier: GPL-2.0 14# 15 16ifeq ("$(origin W)", "command line") 17 export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W) 18endif 19 20ifdef KBUILD_ENABLE_EXTRA_GCC_CHECKS 21warning- := $(empty) 22 23warning-1 := -Wextra -Wunused -Wno-unused-parameter 24warning-1 += -Wmissing-declarations 25warning-1 += -Wmissing-format-attribute 26warning-1 += $(call cc-option, -Wmissing-prototypes) 27warning-1 += -Wold-style-definition 28warning-1 += $(call cc-option, -Wmissing-include-dirs) 29warning-1 += $(call cc-option, -Wunused-but-set-variable) 30warning-1 += $(call cc-disable-warning, missing-field-initializers) 31 32warning-2 := -Waggregate-return 33warning-2 += -Wcast-align 34warning-2 += -Wdisabled-optimization 35warning-2 += -Wnested-externs 36warning-2 += -Wshadow 37warning-2 += $(call cc-option, -Wlogical-op) 38warning-2 += $(call cc-option, -Wmissing-field-initializers) 39 40warning-3 := -Wbad-function-cast 41warning-3 += -Wcast-qual 42warning-3 += -Wconversion 43warning-3 += -Wpacked 44warning-3 += -Wpadded 45warning-3 += -Wpointer-arith 46warning-3 += -Wredundant-decls 47warning-3 += -Wswitch-default 48warning-3 += $(call cc-option, -Wpacked-bitfield-compat) 49warning-3 += $(call cc-option, -Wvla) 50 51warning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) 52warning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) 53warning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) 54 55ifeq ("$(strip $(warning))","") 56 $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown) 57endif 58 59KBUILD_CFLAGS += $(warning) 60 61dtc-warning-2 += -Wnode_name_chars_strict 62dtc-warning-2 += -Wproperty_name_chars_strict 63 64dtc-warning := $(dtc-warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) 65dtc-warning += $(dtc-warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) 66dtc-warning += $(dtc-warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) 67 68DTC_FLAGS += $(dtc-warning) 69 70else 71 72# Disable noisy checks by default 73DTC_FLAGS += -Wno-unit_address_vs_reg 74DTC_FLAGS += -Wno-simple_bus_reg 75DTC_FLAGS += -Wno-unit_address_format 76DTC_FLAGS += -Wno-pci_bridge 77DTC_FLAGS += -Wno-pci_device_bus_num 78DTC_FLAGS += -Wno-pci_device_reg 79 80endif 81