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