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 += -Wmissing-prototypes 27warning-1 += -Wold-style-definition 28warning-1 += -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-option, -Wstringop-truncation) 33# The following turn off the warnings enabled by -Wextra 34warning-1 += -Wno-missing-field-initializers 35warning-1 += -Wno-sign-compare 36 37warning-2 := -Waggregate-return 38warning-2 += -Wcast-align 39warning-2 += -Wdisabled-optimization 40warning-2 += -Wnested-externs 41warning-2 += -Wshadow 42warning-2 += $(call cc-option, -Wlogical-op) 43warning-2 += -Wmissing-field-initializers 44warning-2 += -Wsign-compare 45warning-2 += $(call cc-option, -Wmaybe-uninitialized) 46warning-2 += $(call cc-option, -Wunused-macros) 47 48warning-3 := -Wbad-function-cast 49warning-3 += -Wcast-qual 50warning-3 += -Wconversion 51warning-3 += -Wpacked 52warning-3 += -Wpadded 53warning-3 += -Wpointer-arith 54warning-3 += -Wredundant-decls 55warning-3 += -Wswitch-default 56warning-3 += $(call cc-option, -Wpacked-bitfield-compat) 57 58warning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) 59warning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) 60warning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) 61 62ifeq ("$(strip $(warning))","") 63 $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown) 64endif 65 66KBUILD_CFLAGS += $(warning) 67else 68 69ifdef CONFIG_CC_IS_CLANG 70KBUILD_CFLAGS += -Wno-initializer-overrides 71KBUILD_CFLAGS += -Wno-unused-value 72KBUILD_CFLAGS += -Wno-format 73KBUILD_CFLAGS += -Wno-sign-compare 74KBUILD_CFLAGS += -Wno-format-zero-length 75KBUILD_CFLAGS += -Wno-uninitialized 76endif 77endif 78