1*4882a593Smuzhiyun# SPDX-License-Identifier: GPL-2.0 2*4882a593Smuzhiyun# ========================================================================== 3*4882a593Smuzhiyun# 4*4882a593Smuzhiyun# make W=... settings 5*4882a593Smuzhiyun# 6*4882a593Smuzhiyun# W=1 - warnings that may be relevant and does not occur too often 7*4882a593Smuzhiyun# W=2 - warnings that occur quite often but may still be relevant 8*4882a593Smuzhiyun# W=3 - the more obscure warnings, can most likely be ignored 9*4882a593Smuzhiyun# 10*4882a593Smuzhiyun# $(call cc-option, -W...) handles gcc -W.. options which 11*4882a593Smuzhiyun# are not supported by all versions of the compiler 12*4882a593Smuzhiyun# ========================================================================== 13*4882a593Smuzhiyun 14*4882a593SmuzhiyunKBUILD_CFLAGS += $(call cc-disable-warning, packed-not-aligned) 15*4882a593Smuzhiyun 16*4882a593Smuzhiyunifeq ("$(origin W)", "command line") 17*4882a593Smuzhiyun export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W) 18*4882a593Smuzhiyunendif 19*4882a593Smuzhiyun 20*4882a593Smuzhiyunifdef KBUILD_ENABLE_EXTRA_GCC_CHECKS 21*4882a593Smuzhiyunwarning- := $(empty) 22*4882a593Smuzhiyun 23*4882a593Smuzhiyunwarning-1 := -Wextra -Wunused -Wno-unused-parameter 24*4882a593Smuzhiyunwarning-1 += -Wmissing-declarations 25*4882a593Smuzhiyunwarning-1 += -Wmissing-format-attribute 26*4882a593Smuzhiyunwarning-1 += $(call cc-option, -Wmissing-prototypes) 27*4882a593Smuzhiyunwarning-1 += -Wold-style-definition 28*4882a593Smuzhiyunwarning-1 += $(call cc-option, -Wmissing-include-dirs) 29*4882a593Smuzhiyunwarning-1 += $(call cc-option, -Wunused-but-set-variable) 30*4882a593Smuzhiyunwarning-1 += $(call cc-option, -Wunused-const-variable) 31*4882a593Smuzhiyunwarning-1 += $(call cc-option, -Wpacked-not-aligned) 32*4882a593Smuzhiyunwarning-1 += $(call cc-disable-warning, missing-field-initializers) 33*4882a593Smuzhiyunwarning-1 += $(call cc-disable-warning, sign-compare) 34*4882a593Smuzhiyun 35*4882a593Smuzhiyunwarning-2 := -Waggregate-return 36*4882a593Smuzhiyunwarning-2 += -Wcast-align 37*4882a593Smuzhiyunwarning-2 += -Wdisabled-optimization 38*4882a593Smuzhiyunwarning-2 += -Wnested-externs 39*4882a593Smuzhiyunwarning-2 += -Wshadow 40*4882a593Smuzhiyunwarning-2 += $(call cc-option, -Wlogical-op) 41*4882a593Smuzhiyunwarning-2 += $(call cc-option, -Wmissing-field-initializers) 42*4882a593Smuzhiyunwarning-2 += $(call cc-option, -Wsign-compare) 43*4882a593Smuzhiyunwarning-2 += $(call cc-option, -Wmaybe-uninitialized) 44*4882a593Smuzhiyunwarning-2 += $(call cc-option, -Wunused-macros) 45*4882a593Smuzhiyun 46*4882a593Smuzhiyunwarning-3 := -Wbad-function-cast 47*4882a593Smuzhiyunwarning-3 += -Wcast-qual 48*4882a593Smuzhiyunwarning-3 += -Wconversion 49*4882a593Smuzhiyunwarning-3 += -Wpacked 50*4882a593Smuzhiyunwarning-3 += -Wpadded 51*4882a593Smuzhiyunwarning-3 += -Wpointer-arith 52*4882a593Smuzhiyunwarning-3 += -Wredundant-decls 53*4882a593Smuzhiyunwarning-3 += -Wswitch-default 54*4882a593Smuzhiyunwarning-3 += $(call cc-option, -Wpacked-bitfield-compat) 55*4882a593Smuzhiyunwarning-3 += $(call cc-option, -Wvla) 56*4882a593Smuzhiyun 57*4882a593Smuzhiyunwarning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) 58*4882a593Smuzhiyunwarning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) 59*4882a593Smuzhiyunwarning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) 60*4882a593Smuzhiyun 61*4882a593Smuzhiyunifeq ("$(strip $(warning))","") 62*4882a593Smuzhiyun $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown) 63*4882a593Smuzhiyunendif 64*4882a593Smuzhiyun 65*4882a593SmuzhiyunKBUILD_CFLAGS += $(warning) 66*4882a593Smuzhiyunelse 67*4882a593Smuzhiyun 68*4882a593Smuzhiyunifeq ($(cc-name),clang) 69*4882a593SmuzhiyunKBUILD_CFLAGS += $(call cc-disable-warning, initializer-overrides) 70*4882a593SmuzhiyunKBUILD_CFLAGS += $(call cc-disable-warning, unused-value) 71*4882a593SmuzhiyunKBUILD_CFLAGS += $(call cc-disable-warning, format) 72*4882a593SmuzhiyunKBUILD_CFLAGS += $(call cc-disable-warning, sign-compare) 73*4882a593SmuzhiyunKBUILD_CFLAGS += $(call cc-disable-warning, format-zero-length) 74*4882a593SmuzhiyunKBUILD_CFLAGS += $(call cc-disable-warning, uninitialized) 75*4882a593SmuzhiyunKBUILD_CFLAGS += $(call cc-disable-warning, pointer-to-enum-cast) 76*4882a593SmuzhiyunKBUILD_CFLAGS += $(call cc-disable-warning, unaligned-access) 77*4882a593Smuzhiyunendif 78*4882a593Smuzhiyunendif 79