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 29warning-2 := -Waggregate-return 30warning-2 += -Wcast-align 31warning-2 += -Wdisabled-optimization 32warning-2 += -Wnested-externs 33warning-2 += -Wshadow 34warning-2 += $(call cc-option, -Wlogical-op) 35warning-2 += $(call cc-option, -Wmissing-field-initializers) 36 37warning-3 := -Wbad-function-cast 38warning-3 += -Wcast-qual 39warning-3 += -Wconversion 40warning-3 += -Wpacked 41warning-3 += -Wpadded 42warning-3 += -Wpointer-arith 43warning-3 += -Wredundant-decls 44warning-3 += -Wswitch-default 45warning-3 += $(call cc-option, -Wpacked-bitfield-compat) 46warning-3 += $(call cc-option, -Wvla) 47 48warning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) 49warning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) 50warning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) 51 52ifeq ("$(strip $(warning))","") 53 $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown) 54endif 55 56KBUILD_CFLAGS += $(warning) 57endif 58