| # SPDX-License-Identifier: GPL-2.0 | |
| # ========================================================================== | |
| # | |
| # make W=... settings | |
| # | |
| # W=1 - warnings that may be relevant and does not occur too often | |
| # W=2 - warnings that occur quite often but may still be relevant | |
| # W=3 - the more obscure warnings, can most likely be ignored | |
| # | |
| # $(call cc-option, -W...) handles gcc -W.. options which | |
| # are not supported by all versions of the compiler | |
| # ========================================================================== | |
| KBUILD_CFLAGS += $(call cc-disable-warning, packed-not-aligned) | |
| ifeq ("$(origin W)", "command line") | |
| export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W) | |
| endif | |
| ifdef KBUILD_ENABLE_EXTRA_GCC_CHECKS | |
| warning- := $(empty) | |
| warning-1 := -Wextra -Wunused -Wno-unused-parameter | |
| warning-1 += -Wmissing-declarations | |
| warning-1 += -Wmissing-format-attribute | |
| warning-1 += -Wmissing-prototypes | |
| warning-1 += -Wold-style-definition | |
| warning-1 += -Wmissing-include-dirs | |
| warning-1 += $(call cc-option, -Wunused-but-set-variable) | |
| warning-1 += $(call cc-option, -Wunused-const-variable) | |
| warning-1 += $(call cc-option, -Wpacked-not-aligned) | |
| warning-1 += $(call cc-option, -Wstringop-truncation) | |
| # The following turn off the warnings enabled by -Wextra | |
| warning-1 += -Wno-missing-field-initializers | |
| warning-1 += -Wno-sign-compare | |
| warning-2 += -Wcast-align | |
| warning-2 += -Wdisabled-optimization | |
| warning-2 += -Wnested-externs | |
| warning-2 += -Wshadow | |
| warning-2 += $(call cc-option, -Wlogical-op) | |
| warning-2 += -Wmissing-field-initializers | |
| warning-2 += -Wsign-compare | |
| warning-2 += $(call cc-option, -Wmaybe-uninitialized) | |
| warning-2 += $(call cc-option, -Wunused-macros) | |
| warning-3 := -Wbad-function-cast | |
| warning-3 += -Wcast-qual | |
| warning-3 += -Wconversion | |
| warning-3 += -Wpacked | |
| warning-3 += -Wpadded | |
| warning-3 += -Wpointer-arith | |
| warning-3 += -Wredundant-decls | |
| warning-3 += -Wswitch-default | |
| warning-3 += $(call cc-option, -Wpacked-bitfield-compat) | |
| warning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) | |
| warning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) | |
| warning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) | |
| ifeq ("$(strip $(warning))","") | |
| $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown) | |
| endif | |
| KBUILD_CFLAGS += $(warning) | |
| else | |
| ifdef CONFIG_CC_IS_CLANG | |
| KBUILD_CFLAGS += -Wno-initializer-overrides | |
| KBUILD_CFLAGS += -Wno-format | |
| KBUILD_CFLAGS += -Wno-sign-compare | |
| KBUILD_CFLAGS += -Wno-format-zero-length | |
| endif | |
| endif |