mirror of
https://github.com/torvalds/linux
synced 2024-07-22 19:21:07 +00:00
80b6093b55
The use of an undefined macro in an #if directive is warned, but only in *.c files. No warning from other files such as *.S, *.lds.S. Since -Wundef is a preprocessor-related warning, it should be added to KBUILD_CPPFLAGS instead of KBUILD_CFLAGS. My previous attempt [1] uncovered several issues. I could not finish fixing them all. This commit adds -Wundef to KBUILD_CPPFLAGS for W=1 builds in order to block new breakages. (The kbuild test robot tests with W=1) We can fix the warnings one by one. After fixing all of them, we can make it default in the top Makefile, and remove -Wundef from KBUILD_CFLAGS. [1]: https://lore.kernel.org/all/20221012180118.331005-2-masahiroy@kernel.org/ Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Reviewed-by: Nathan Chancellor <nathan@kernel.org> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
119 lines
3.5 KiB
Makefile
119 lines
3.5 KiB
Makefile
# 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 += $(call cc-option, -Wstringop-truncation)
|
|
# The following turn off the warnings enabled by -Wextra
|
|
KBUILD_CFLAGS += -Wno-missing-field-initializers
|
|
KBUILD_CFLAGS += -Wno-sign-compare
|
|
KBUILD_CFLAGS += -Wno-type-limits
|
|
KBUILD_CFLAGS += -Wno-shift-negative-value
|
|
|
|
KBUILD_CPPFLAGS += -Wundef
|
|
KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN1
|
|
|
|
else
|
|
|
|
# Some diagnostics enabled by default are noisy.
|
|
# Suppress them by using -Wno... except for W=1.
|
|
|
|
ifdef CONFIG_CC_IS_CLANG
|
|
KBUILD_CFLAGS += -Wno-initializer-overrides
|
|
# Clang before clang-16 would warn on default argument promotions.
|
|
ifneq ($(call clang-min-version, 160000),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 ($(call clang-min-version, 120000),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)
|
|
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 += $(call cc-option, -Wpacked-bitfield-compat)
|
|
|
|
KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN3
|
|
|
|
endif
|
|
|
|
#
|
|
# W=e - error out on warnings
|
|
#
|
|
ifneq ($(findstring e, $(KBUILD_EXTRA_WARN)),)
|
|
|
|
KBUILD_CFLAGS += -Werror
|
|
|
|
endif
|