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- # 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 += $(call cc-disable-warning, unaligned-access)
- endif
- endif
- #
- # W=2 - warnings which occur quite often but may still be relevant
- #
- ifneq ($(findstring 2, $(KBUILD_EXTRA_WARN)),)
- KBUILD_CFLAGS += -Wdisabled-optimization
- KBUILD_CFLAGS += -Wnested-externs
- 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
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