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kbuild: Drop superfluous compiler option checks

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Many of the compiler option checks are not necessary anymore with the
current supported versions of compilers (clang 15+, GCC 8.1+).

Remove them.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://patch.msgid.link/20260113-kbuild-cc-option-v1-1-011314a0f7f1@weissschuh.net
[nathan: Add minor note about currently supported compilers]
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
This commit is contained in:
Thomas Weißschuh
2026-01-13 08:29:58 +01:00
committed by Nathan Chancellor
parent 76df6815da
commit 379b749add
2 changed files with 11 additions and 14 deletions
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2
Makefile
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@@ -1102,7 +1102,7 @@ KBUILD_CFLAGS += -fno-builtin-wcslen
# change __FILE__ to the relative path to the source directory
ifdef building_out_of_srctree
KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srcroot)/=)
KBUILD_CPPFLAGS += -fmacro-prefix-map=$(srcroot)/=
endif
# include additional Makefiles when needed

23
scripts/Makefile.warn
View File

@@ -16,7 +16,7 @@ KBUILD_CFLAGS += -Werror=return-type
KBUILD_CFLAGS += -Werror=strict-prototypes
KBUILD_CFLAGS += -Wno-format-security
KBUILD_CFLAGS += -Wno-trigraphs
KBUILD_CFLAGS += $(call cc-option, -Wno-frame-address)
KBUILD_CFLAGS += -Wno-frame-address
KBUILD_CFLAGS += $(call cc-option, -Wno-address-of-packed-member)
KBUILD_CFLAGS += -Wmissing-declarations
KBUILD_CFLAGS += -Wmissing-prototypes
@@ -75,7 +75,7 @@ KBUILD_CFLAGS += -Wno-pointer-sign
# In order to make sure new function cast mismatches are not introduced
# in the kernel (to avoid tripping CFI checking), the kernel should be
# globally built with -Wcast-function-type.
KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type)
KBUILD_CFLAGS += -Wcast-function-type
# Currently, disable -Wstringop-overflow for GCC 11, globally.
KBUILD_CFLAGS-$(CONFIG_CC_NO_STRINGOP_OVERFLOW) += $(call cc-option, -Wno-stringop-overflow)
@@ -102,7 +102,7 @@ KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH)
KBUILD_CFLAGS += -Werror=date-time
# enforce correct pointer usage
KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
KBUILD_CFLAGS += -Werror=incompatible-pointer-types
# Require designated initializers for all marked structures
KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
@@ -119,7 +119,7 @@ ifneq ($(findstring 1, $(KBUILD_EXTRA_WARN)),)
KBUILD_CFLAGS += -Wmissing-format-attribute
KBUILD_CFLAGS += -Wmissing-include-dirs
KBUILD_CFLAGS += $(call cc-option, -Wunused-const-variable)
KBUILD_CFLAGS += -Wunused-const-variable
KBUILD_CPPFLAGS += -Wundef
KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN1
@@ -128,12 +128,12 @@ else
# Some diagnostics enabled by default are noisy.
# Suppress them by using -Wno... except for W=1.
KBUILD_CFLAGS += $(call cc-option, -Wno-unused-but-set-variable)
KBUILD_CFLAGS += $(call cc-option, -Wno-unused-const-variable)
KBUILD_CFLAGS += -Wno-unused-but-set-variable
KBUILD_CFLAGS += -Wno-unused-const-variable
KBUILD_CFLAGS += $(call cc-option, -Wno-packed-not-aligned)
KBUILD_CFLAGS += $(call cc-option, -Wno-format-overflow)
ifdef CONFIG_CC_IS_GCC
KBUILD_CFLAGS += $(call cc-option, -Wno-format-truncation)
KBUILD_CFLAGS += -Wno-format-truncation
endif
KBUILD_CFLAGS += $(call cc-option, -Wno-stringop-truncation)
@@ -148,14 +148,11 @@ KBUILD_CFLAGS += -Wno-format
# problematic.
KBUILD_CFLAGS += -Wformat-extra-args -Wformat-invalid-specifier
KBUILD_CFLAGS += -Wformat-zero-length -Wnonnull
# Requires clang-12+.
ifeq ($(call clang-min-version, 120000),y)
KBUILD_CFLAGS += -Wformat-insufficient-args
endif
endif
KBUILD_CFLAGS += $(call cc-option, -Wno-pointer-to-enum-cast)
KBUILD_CFLAGS += -Wno-pointer-to-enum-cast
KBUILD_CFLAGS += -Wno-tautological-constant-out-of-range-compare
KBUILD_CFLAGS += $(call cc-option, -Wno-unaligned-access)
KBUILD_CFLAGS += -Wno-unaligned-access
KBUILD_CFLAGS += -Wno-enum-compare-conditional
endif
@@ -169,7 +166,7 @@ ifneq ($(findstring 2, $(KBUILD_EXTRA_WARN)),)
KBUILD_CFLAGS += -Wdisabled-optimization
KBUILD_CFLAGS += -Wshadow
KBUILD_CFLAGS += $(call cc-option, -Wlogical-op)
KBUILD_CFLAGS += $(call cc-option, -Wunused-macros)
KBUILD_CFLAGS += -Wunused-macros
KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN2