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-disable-warning, missing-field-initializers) 28 29# Clang 30warning-1 += $(call cc-disable-warning, initializer-overrides) 31warning-1 += $(call cc-disable-warning, unused-value) 32warning-1 += $(call cc-disable-warning, format) 33warning-1 += $(call cc-disable-warning, unknown-warning-option) 34warning-1 += $(call cc-disable-warning, sign-compare) 35warning-1 += $(call cc-disable-warning, format-zero-length) 36warning-1 += $(call cc-disable-warning, uninitialized) 37warning-1 += $(call cc-option, -fcatch-undefined-behavior) 38 39warning-2 := -Waggregate-return 40warning-2 += -Wcast-align 41warning-2 += -Wdisabled-optimization 42warning-2 += -Wnested-externs 43warning-2 += -Wshadow 44warning-2 += $(call cc-option, -Wlogical-op) 45warning-2 += $(call cc-option, -Wmissing-field-initializers) 46 47warning-3 := -Wbad-function-cast 48warning-3 += -Wcast-qual 49warning-3 += -Wconversion 50warning-3 += -Wpacked 51warning-3 += -Wpadded 52warning-3 += -Wpointer-arith 53warning-3 += -Wredundant-decls 54warning-3 += -Wswitch-default 55warning-3 += $(call cc-option, -Wpacked-bitfield-compat) 56warning-3 += $(call cc-option, -Wvla) 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) 67endif 68