kbuild: consolidate warning flags in scripts/Makefile.extrawarn
Warning options are enabled and disabled in inconsistent ways and inconsistent locations. Start rearranging those by moving all options into Makefile.extrawarn. This should not change any behavior, but makes sure we can group them in a way that ensures that each warning that got temporarily disabled is turned back on at an appropriate W=1 level later on. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Arnd Bergmann
Masahiro Yamada
parent
077af782e2
commit
e88ca24319
88
Makefile
88
Makefile
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@ -563,14 +563,6 @@ KBUILD_CFLAGS += -funsigned-char
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KBUILD_CFLAGS += -fno-common
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KBUILD_CFLAGS += -fno-PIE
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KBUILD_CFLAGS += -fno-strict-aliasing
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KBUILD_CFLAGS += -Wall
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KBUILD_CFLAGS += -Wundef
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KBUILD_CFLAGS += -Werror=implicit-function-declaration
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KBUILD_CFLAGS += -Werror=implicit-int
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KBUILD_CFLAGS += -Werror=return-type
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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_CPPFLAGS := -D__KERNEL__
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KBUILD_RUSTFLAGS := $(rust_common_flags) \
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@ -823,10 +815,6 @@ endif # may-sync-config
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endif # need-config
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KBUILD_CFLAGS += -fno-delete-null-pointer-checks
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KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
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KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
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KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
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KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
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ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
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KBUILD_CFLAGS += -O2
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@ -857,40 +845,15 @@ ifdef CONFIG_READABLE_ASM
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KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining
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endif
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ifneq ($(CONFIG_FRAME_WARN),0)
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KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
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endif
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stackp-flags-y := -fno-stack-protector
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stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
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stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
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KBUILD_CFLAGS += $(stackp-flags-y)
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KBUILD_CPPFLAGS-$(CONFIG_WERROR) += -Werror
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KBUILD_CPPFLAGS += $(KBUILD_CPPFLAGS-y)
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KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUNDS) += -Wno-array-bounds
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KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings
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KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y)
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ifdef CONFIG_CC_IS_CLANG
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# The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable.
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KBUILD_CFLAGS += -Wno-gnu
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else
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# gcc inanely warns about local variables called 'main'
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KBUILD_CFLAGS += -Wno-main
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endif
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# These warnings generated too much noise in a regular build.
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# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
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KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
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KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
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# These result in bogus false positives
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KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer)
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ifdef CONFIG_FRAME_POINTER
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KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
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KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y
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@ -1025,51 +988,12 @@ endif
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# arch Makefile may override CC so keep this after arch Makefile is included
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NOSTDINC_FLAGS += -nostdinc
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# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
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KBUILD_CFLAGS += -Wvla
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# disable pointer signed / unsigned warnings in gcc 4.0
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KBUILD_CFLAGS += -Wno-pointer-sign
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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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# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE,
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# the kernel uses only C99 flexible arrays for dynamically sized trailing
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# arrays. Enforce this for everything that may examine structure sizes and
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# perform bounds checking.
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KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3)
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# disable stringop warnings in gcc 8+
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KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
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# We'll want to enable this eventually, but it's not going away for 5.7 at least
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KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
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# Another good warning that we'll want to enable eventually
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KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
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# Enabled with W=2, disabled by default as noisy
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ifdef CONFIG_CC_IS_GCC
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KBUILD_CFLAGS += -Wno-maybe-uninitialized
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endif
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# The allocators already balk at large sizes, so silence the compiler
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# warnings for bounds checks involving those possible values. While
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# -Wno-alloc-size-larger-than would normally be used here, earlier versions
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# of gcc (<9.1) weirdly don't handle the option correctly when _other_
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# warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX
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# doesn't work (as it is documented to), silently resolving to "0" prior to
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# version 9.1 (and producing an error more recently). Numeric values larger
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# than PTRDIFF_MAX also don't work prior to version 9.1, which are silently
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# ignored, continuing to default to PTRDIFF_MAX. So, left with no other
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# choice, we must perform a versioned check to disable this warning.
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# https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au
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KBUILD_CFLAGS-$(call gcc-min-version, 90100) += -Wno-alloc-size-larger-than
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KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH)
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# disable invalid "can't wrap" optimizations for signed / pointers
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KBUILD_CFLAGS += -fno-strict-overflow
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@ -1081,18 +1005,6 @@ ifdef CONFIG_CC_IS_GCC
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KBUILD_CFLAGS += -fconserve-stack
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endif
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# Prohibit date/time macros, which would make the build non-deterministic
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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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# Require designated initializers for all marked structures
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KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
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# Warn if there is an enum types mismatch
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KBUILD_CFLAGS += $(call cc-option,-Wenum-conversion)
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# change __FILE__ to the relative path from the srctree
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KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
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@ -6,6 +6,96 @@
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# They are independent, and can be combined like W=12 or W=123e.
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# ==========================================================================
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# Default set of warnings, always enabled
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KBUILD_CFLAGS += -Wall
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KBUILD_CFLAGS += -Wundef
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KBUILD_CFLAGS += -Werror=implicit-function-declaration
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KBUILD_CFLAGS += -Werror=implicit-int
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KBUILD_CFLAGS += -Werror=return-type
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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-disable-warning,frame-address,)
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KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
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KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
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KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
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ifneq ($(CONFIG_FRAME_WARN),0)
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KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
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endif
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KBUILD_CPPFLAGS-$(CONFIG_WERROR) += -Werror
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KBUILD_CPPFLAGS += $(KBUILD_CPPFLAGS-y)
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KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUNDS) += -Wno-array-bounds
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ifdef CONFIG_CC_IS_CLANG
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# The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable.
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KBUILD_CFLAGS += -Wno-gnu
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else
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# gcc inanely warns about local variables called 'main'
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KBUILD_CFLAGS += -Wno-main
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endif
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# These warnings generated too much noise in a regular build.
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# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
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KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
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KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
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# These result in bogus false positives
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KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer)
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# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
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KBUILD_CFLAGS += -Wvla
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# disable pointer signed / unsigned warnings in gcc 4.0
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KBUILD_CFLAGS += -Wno-pointer-sign
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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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# disable stringop warnings in gcc 8+
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KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
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# We'll want to enable this eventually, but it's not going away for 5.7 at least
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KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
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# Another good warning that we'll want to enable eventually
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KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
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# Enabled with W=2, disabled by default as noisy
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ifdef CONFIG_CC_IS_GCC
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KBUILD_CFLAGS += -Wno-maybe-uninitialized
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endif
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# The allocators already balk at large sizes, so silence the compiler
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# warnings for bounds checks involving those possible values. While
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# -Wno-alloc-size-larger-than would normally be used here, earlier versions
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# of gcc (<9.1) weirdly don't handle the option correctly when _other_
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# warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX
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# doesn't work (as it is documented to), silently resolving to "0" prior to
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# version 9.1 (and producing an error more recently). Numeric values larger
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# than PTRDIFF_MAX also don't work prior to version 9.1, which are silently
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# ignored, continuing to default to PTRDIFF_MAX. So, left with no other
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# choice, we must perform a versioned check to disable this warning.
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# https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au
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KBUILD_CFLAGS-$(call gcc-min-version, 90100) += -Wno-alloc-size-larger-than
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KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH)
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# Prohibit date/time macros, which would make the build non-deterministic
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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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# Require designated initializers for all marked structures
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KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
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# Warn if there is an enum types mismatch
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KBUILD_CFLAGS += $(call cc-option,-Wenum-conversion)
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KBUILD_CFLAGS += $(call cc-disable-warning, packed-not-aligned)
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# backward compatibility
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