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