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 14KBUILD_CFLAGS += $(call cc-disable-warning, packed-not-aligned) 15 16ifeq ("$(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-option, -Wunused-const-variable) 31warning-1 += $(call cc-option, -Wpacked-not-aligned) 32warning-1 += $(call cc-disable-warning, missing-field-initializers) 33warning-1 += $(call cc-disable-warning, sign-compare) 34 35warning-2 := -Waggregate-return 36warning-2 += -Wcast-align 37warning-2 += -Wdisabled-optimization 38warning-2 += -Wnested-externs 39warning-2 += -Wshadow 40warning-2 += $(call cc-option, -Wlogical-op) 41warning-2 += $(call cc-option, -Wmissing-field-initializers) 42warning-2 += $(call cc-option, -Wsign-compare) 43warning-2 += $(call cc-option, -Wmaybe-uninitialized) 44warning-2 += $(call cc-option, -Wunused-macros) 45 46warning-3 := -Wbad-function-cast 47warning-3 += -Wcast-qual 48warning-3 += -Wconversion 49warning-3 += -Wpacked 50warning-3 += -Wpadded 51warning-3 += -Wpointer-arith 52warning-3 += -Wredundant-decls 53warning-3 += -Wswitch-default 54warning-3 += $(call cc-option, -Wpacked-bitfield-compat) 55warning-3 += $(call cc-option, -Wvla) 56 57warning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) 58warning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) 59warning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) 60 61ifeq ("$(strip $(warning))","") 62 $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown) 63endif 64 65KBUILD_CFLAGS += $(warning) 66else 67 68ifeq ($(cc-name),clang) 69KBUILD_CFLAGS += $(call cc-disable-warning, initializer-overrides) 70KBUILD_CFLAGS += $(call cc-disable-warning, unused-value) 71KBUILD_CFLAGS += $(call cc-disable-warning, format) 72KBUILD_CFLAGS += $(call cc-disable-warning, sign-compare) 73KBUILD_CFLAGS += $(call cc-disable-warning, format-zero-length) 74KBUILD_CFLAGS += $(call cc-disable-warning, uninitialized) 75endif 76endif 77