| # SPDX-License-Identifier: GPL-2.0 |
| # ========================================================================== |
| # make W=... settings |
| # |
| # There are four warning groups enabled by W=1, W=2, W=3, and W=e |
| # They are independent, and can be combined like W=12 or W=123e. |
| # ========================================================================== |
| |
| 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 += $(call cc-option, -Wstringop-truncation) |
| # The following turn off the warnings enabled by -Wextra |
| KBUILD_CFLAGS += -Wno-missing-field-initializers |
| KBUILD_CFLAGS += -Wno-sign-compare |
| KBUILD_CFLAGS += -Wno-type-limits |
| KBUILD_CFLAGS += -Wno-shift-negative-value |
| |
| KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN1 |
| |
| else |
| |
| # Some diagnostics enabled by default are noisy. |
| # Suppress them by using -Wno... except for W=1. |
| |
| ifdef CONFIG_CC_IS_CLANG |
| KBUILD_CFLAGS += -Wno-initializer-overrides |
| # Clang before clang-16 would warn on default argument promotions. |
| ifeq ($(shell [ $(CONFIG_CLANG_VERSION) -lt 160000 ] && echo y),y) |
| # Disable -Wformat |
| KBUILD_CFLAGS += -Wno-format |
| # Then re-enable flags that were part of the -Wformat group that aren't |
| # problematic. |
| KBUILD_CFLAGS += -Wformat-extra-args -Wformat-invalid-specifier |
| KBUILD_CFLAGS += -Wformat-zero-length -Wnonnull |
| # Requires clang-12+. |
| ifeq ($(shell [ $(CONFIG_CLANG_VERSION) -ge 120000 ] && echo y),y) |
| KBUILD_CFLAGS += -Wformat-insufficient-args |
| endif |
| endif |
| KBUILD_CFLAGS += -Wno-sign-compare |
| 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 += -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 += $(call cc-option, -Wpacked-bitfield-compat) |
| |
| KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN3 |
| |
| endif |
| |
| # |
| # W=e - error out on warnings |
| # |
| ifneq ($(findstring e, $(KBUILD_EXTRA_WARN)),) |
| |
| KBUILD_CFLAGS += -Werror |
| |
| endif |
