| # SPDX-License-Identifier: GPL-2.0 | |
| # ========================================================================== | |
| # make W=... settings | |
| # | |
| # There are three warning groups enabled by W=1, W=2, W=3. | |
| # They are independent, and can be combined like W=12 or W=123. | |
| # ========================================================================== | |
| KBUILD_CFLAGS += $(call cc-disable-warning, packed-not-aligned) | |
| # backward compatibility | |
| KBUILD_EXTRA_WARN ?= $(KBUILD_ENABLE_EXTRA_GCC_CHECKS) | |
| ifeq ("$(origin W)", "command line") | |
| KBUILD_EXTRA_WARN := $(W) | |
| endif | |
| export KBUILD_EXTRA_WARN | |
| # | |
| # W=1 - warnings which may be relevant and do not occur too often | |
| # | |
| ifneq ($(findstring 1, $(KBUILD_EXTRA_WARN)),) | |
| KBUILD_CFLAGS += -Wextra -Wunused -Wno-unused-parameter | |
| KBUILD_CFLAGS += -Wmissing-declarations | |
| KBUILD_CFLAGS += -Wmissing-format-attribute | |
| KBUILD_CFLAGS += -Wmissing-prototypes | |
| KBUILD_CFLAGS += -Wold-style-definition | |
| KBUILD_CFLAGS += -Wmissing-include-dirs | |
| KBUILD_CFLAGS += $(call cc-option, -Wunused-but-set-variable) | |
| KBUILD_CFLAGS += $(call cc-option, -Wunused-const-variable) | |
| KBUILD_CFLAGS += $(call cc-option, -Wpacked-not-aligned) | |
| KBUILD_CFLAGS += $(call cc-option, -Wstringop-truncation) | |
| # The following turn off the warnings enabled by -Wextra | |
| KBUILD_CFLAGS += -Wno-missing-field-initializers | |
| KBUILD_CFLAGS += -Wno-sign-compare | |
| KBUILD_CFLAGS += -Wno-type-limits | |
| KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN1 | |
| else | |
| # Some diagnostics enabled by default are noisy. | |
| # Suppress them by using -Wno... except for W=1. | |
| 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 | |
| KBUILD_CFLAGS += $(call cc-disable-warning, pointer-to-enum-cast) | |
| KBUILD_CFLAGS += -Wno-tautological-constant-out-of-range-compare | |
| KBUILD_CFLAGS += $(call cc-disable-warning, unaligned-access) | |
| KBUILD_CFLAGS += $(call cc-disable-warning, cast-function-type-strict) | |
| endif | |
| endif | |
| # | |
| # W=2 - warnings which occur quite often but may still be relevant | |
| # | |
| ifneq ($(findstring 2, $(KBUILD_EXTRA_WARN)),) | |
| KBUILD_CFLAGS += -Wdisabled-optimization | |
| KBUILD_CFLAGS += -Wshadow | |
| KBUILD_CFLAGS += $(call cc-option, -Wlogical-op) | |
| KBUILD_CFLAGS += -Wmissing-field-initializers | |
| KBUILD_CFLAGS += -Wtype-limits | |
| KBUILD_CFLAGS += $(call cc-option, -Wmaybe-uninitialized) | |
| KBUILD_CFLAGS += $(call cc-option, -Wunused-macros) | |
| KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN2 | |
| endif | |
| # | |
| # W=3 - more obscure warnings, can most likely be ignored | |
| # | |
| ifneq ($(findstring 3, $(KBUILD_EXTRA_WARN)),) | |
| KBUILD_CFLAGS += -Wbad-function-cast | |
| KBUILD_CFLAGS += -Wcast-align | |
| KBUILD_CFLAGS += -Wcast-qual | |
| KBUILD_CFLAGS += -Wconversion | |
| KBUILD_CFLAGS += -Wpacked | |
| KBUILD_CFLAGS += -Wpadded | |
| KBUILD_CFLAGS += -Wpointer-arith | |
| KBUILD_CFLAGS += -Wredundant-decls | |
| KBUILD_CFLAGS += -Wsign-compare | |
| KBUILD_CFLAGS += -Wswitch-default | |
| KBUILD_CFLAGS += $(call cc-option, -Wpacked-bitfield-compat) | |
| KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN3 | |
| endif |