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) 39 40warning-3 := -Wbad-function-cast 41warning-3 += -Wcast-qual 42warning-3 += -Wconversion 43warning-3 += -Wpacked 44warning-3 += -Wpadded 45warning-3 += -Wpointer-arith 46warning-3 += -Wredundant-decls 47warning-3 += -Wswitch-default 48warning-3 += $(call cc-option, -Wpacked-bitfield-compat) 49warning-3 += $(call cc-option, -Wvla) 50 51warning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) 52warning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) 53warning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) 54 55ifeq ("$(strip $(warning))","") 56 $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown) 57endif 58 59KBUILD_CFLAGS += $(warning) 60else 61 62ifeq ($(cc-name),clang) 63KBUILD_CFLAGS += $(call cc-disable-warning, initializer-overrides) 64KBUILD_CFLAGS += $(call cc-disable-warning, unused-value) 65KBUILD_CFLAGS += $(call cc-disable-warning, format) 66KBUILD_CFLAGS += $(call cc-disable-warning, unknown-warning-option) 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