Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
kbuild: Drop superfluous compiler option checks
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>
authored by
Thomas Weißschuh
and committed by
Nathan Chancellor
379b749a
76df6815
+11
-14
+1
-1
Makefile
+1
-1
Makefile
···
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# change __FILE__ to the relative path to the source directory
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ifdef building_out_of_srctree
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KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srcroot)/=)
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+
KBUILD_CPPFLAGS += -fmacro-prefix-map=$(srcroot)/=
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endif
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# include additional Makefiles when needed
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scripts/Makefile.warn
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scripts/Makefile.warn
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KBUILD_CFLAGS += -Werror=strict-prototypes
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KBUILD_CFLAGS += -Wno-format-security
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KBUILD_CFLAGS += -Wno-trigraphs
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KBUILD_CFLAGS += $(call cc-option, -Wno-frame-address)
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KBUILD_CFLAGS += -Wno-frame-address
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KBUILD_CFLAGS += $(call cc-option, -Wno-address-of-packed-member)
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KBUILD_CFLAGS += -Wmissing-declarations
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KBUILD_CFLAGS += -Wmissing-prototypes
···
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# In order to make sure new function cast mismatches are not introduced
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# in the kernel (to avoid tripping CFI checking), the kernel should be
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# globally built with -Wcast-function-type.
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KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type)
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KBUILD_CFLAGS += -Wcast-function-type
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# Currently, disable -Wstringop-overflow for GCC 11, globally.
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KBUILD_CFLAGS-$(CONFIG_CC_NO_STRINGOP_OVERFLOW) += $(call cc-option, -Wno-stringop-overflow)
···
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KBUILD_CFLAGS += -Werror=date-time
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# enforce correct pointer usage
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KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
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KBUILD_CFLAGS += -Werror=incompatible-pointer-types
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# Require designated initializers for all marked structures
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KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
···
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KBUILD_CFLAGS += -Wmissing-format-attribute
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KBUILD_CFLAGS += -Wmissing-include-dirs
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KBUILD_CFLAGS += $(call cc-option, -Wunused-const-variable)
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KBUILD_CFLAGS += -Wunused-const-variable
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KBUILD_CPPFLAGS += -Wundef
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KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN1
···
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# Some diagnostics enabled by default are noisy.
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# Suppress them by using -Wno... except for W=1.
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KBUILD_CFLAGS += $(call cc-option, -Wno-unused-but-set-variable)
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KBUILD_CFLAGS += $(call cc-option, -Wno-unused-const-variable)
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KBUILD_CFLAGS += -Wno-unused-but-set-variable
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KBUILD_CFLAGS += -Wno-unused-const-variable
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KBUILD_CFLAGS += $(call cc-option, -Wno-packed-not-aligned)
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KBUILD_CFLAGS += $(call cc-option, -Wno-format-overflow)
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ifdef CONFIG_CC_IS_GCC
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KBUILD_CFLAGS += $(call cc-option, -Wno-format-truncation)
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KBUILD_CFLAGS += -Wno-format-truncation
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endif
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KBUILD_CFLAGS += $(call cc-option, -Wno-stringop-truncation)
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···
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# problematic.
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KBUILD_CFLAGS += -Wformat-extra-args -Wformat-invalid-specifier
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KBUILD_CFLAGS += -Wformat-zero-length -Wnonnull
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# Requires clang-12+.
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ifeq ($(call clang-min-version, 120000),y)
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KBUILD_CFLAGS += -Wformat-insufficient-args
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endif
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endif
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KBUILD_CFLAGS += $(call cc-option, -Wno-pointer-to-enum-cast)
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KBUILD_CFLAGS += -Wno-pointer-to-enum-cast
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KBUILD_CFLAGS += -Wno-tautological-constant-out-of-range-compare
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KBUILD_CFLAGS += $(call cc-option, -Wno-unaligned-access)
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KBUILD_CFLAGS += -Wno-unaligned-access
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KBUILD_CFLAGS += -Wno-enum-compare-conditional
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endif
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···
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KBUILD_CFLAGS += -Wdisabled-optimization
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KBUILD_CFLAGS += -Wshadow
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KBUILD_CFLAGS += $(call cc-option, -Wlogical-op)
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KBUILD_CFLAGS += $(call cc-option, -Wunused-macros)
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KBUILD_CFLAGS += -Wunused-macros
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KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN2
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