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-option, -Wunused-const-variable) 29warning-1 += $(call cc-disable-warning, missing-field-initializers) 30warning-1 += $(call cc-disable-warning, sign-compare) 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) 39warning-2 += $(call cc-option, -Wsign-compare) 40warning-2 += $(call cc-option, -Wmaybe-uninitialized) 41warning-2 += $(call cc-option, -Wunused-macros) 42 43warning-3 := -Wbad-function-cast 44warning-3 += -Wcast-qual 45warning-3 += -Wconversion 46warning-3 += -Wpacked 47warning-3 += -Wpadded 48warning-3 += -Wpointer-arith 49warning-3 += -Wredundant-decls 50warning-3 += -Wswitch-default 51warning-3 += $(call cc-option, -Wpacked-bitfield-compat) 52warning-3 += $(call cc-option, -Wvla) 53 54warning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) 55warning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) 56warning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) 57 58ifeq ("$(strip $(warning))","") 59 $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown) 60endif 61 62KBUILD_CFLAGS += $(warning) 63else 64 65ifeq ($(cc-name),clang) 66KBUILD_CFLAGS += $(call cc-disable-warning, initializer-overrides) 67KBUILD_CFLAGS += $(call cc-disable-warning, unused-value) 68KBUILD_CFLAGS += $(call cc-disable-warning, format) 69KBUILD_CFLAGS += $(call cc-disable-warning, sign-compare) 70KBUILD_CFLAGS += $(call cc-disable-warning, format-zero-length) 71KBUILD_CFLAGS += $(call cc-disable-warning, uninitialized) 72endif 73endif 74