diff options
Diffstat (limited to 'scripts/Makefile.extrawarn')
| -rw-r--r-- | scripts/Makefile.extrawarn | 51 |
1 files changed, 34 insertions, 17 deletions
diff --git a/scripts/Makefile.extrawarn b/scripts/Makefile.extrawarn index d88acdf40855..dca175fffcab 100644 --- a/scripts/Makefile.extrawarn +++ b/scripts/Makefile.extrawarn @@ -16,8 +16,8 @@ KBUILD_CFLAGS += -Werror=return-type KBUILD_CFLAGS += -Werror=strict-prototypes KBUILD_CFLAGS += -Wno-format-security KBUILD_CFLAGS += -Wno-trigraphs -KBUILD_CFLAGS += $(call cc-disable-warning, frame-address) -KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) +KBUILD_CFLAGS += $(call cc-option, -Wno-frame-address) +KBUILD_CFLAGS += $(call cc-option, -Wno-address-of-packed-member) KBUILD_CFLAGS += -Wmissing-declarations KBUILD_CFLAGS += -Wmissing-prototypes @@ -35,8 +35,20 @@ KBUILD_CFLAGS += -Wno-gnu # Clang checks for overflow/truncation with '%p', while GCC does not: # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111219 -KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow-non-kprintf) -KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation-non-kprintf) +KBUILD_CFLAGS += $(call cc-option, -Wno-format-overflow-non-kprintf) +KBUILD_CFLAGS += $(call cc-option, -Wno-format-truncation-non-kprintf) + +# Clang may emit a warning when a const variable, such as the dummy variables +# in typecheck(), or const member of an aggregate type are not initialized, +# which can result in unexpected behavior. However, in many audited cases of +# the "field" variant of the warning, this is intentional because the field is +# never used within a particular call path, the field is within a union with +# other non-const members, or the containing object is not const so the field +# can be modified via memcpy() / memset(). While the variable warning also gets +# disabled with this same switch, there should not be too much coverage lost +# because -Wuninitialized will still flag when an uninitialized const variable +# is used. +KBUILD_CFLAGS += $(call cc-option, -Wno-default-const-init-unsafe) else # gcc inanely warns about local variables called 'main' @@ -44,10 +56,15 @@ KBUILD_CFLAGS += -Wno-main endif # These result in bogus false positives -KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer) +KBUILD_CFLAGS += $(call cc-option, -Wno-dangling-pointer) -# Variable Length Arrays (VLAs) should not be used anywhere in the kernel -KBUILD_CFLAGS += -Wvla +# Stack Variable Length Arrays (VLAs) must not be used in the kernel. +# Function array parameters should, however, be usable, but -Wvla will +# warn for those. Clang has no way yet to distinguish between the VLA +# types, so depend on GCC for now to keep stack VLAs out of the tree. +# https://github.com/llvm/llvm-project/issues/57098 +# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98217 +KBUILD_CFLAGS += $(call cc-option,-Wvla-larger-than=1) # disable pointer signed / unsigned warnings in gcc 4.0 KBUILD_CFLAGS += -Wno-pointer-sign @@ -58,11 +75,11 @@ KBUILD_CFLAGS += -Wno-pointer-sign KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type) # Currently, disable -Wstringop-overflow for GCC 11, globally. -KBUILD_CFLAGS-$(CONFIG_CC_NO_STRINGOP_OVERFLOW) += $(call cc-disable-warning, stringop-overflow) +KBUILD_CFLAGS-$(CONFIG_CC_NO_STRINGOP_OVERFLOW) += $(call cc-option, -Wno-stringop-overflow) KBUILD_CFLAGS-$(CONFIG_CC_STRINGOP_OVERFLOW) += $(call cc-option, -Wstringop-overflow) # Currently, disable -Wunterminated-string-initialization as broken -KBUILD_CFLAGS += $(call cc-disable-warning, unterminated-string-initialization) +KBUILD_CFLAGS += $(call cc-option, -Wno-unterminated-string-initialization) # The allocators already balk at large sizes, so silence the compiler # warnings for bounds checks involving those possible values. While @@ -108,14 +125,14 @@ else # Some diagnostics enabled by default are noisy. # Suppress them by using -Wno... except for W=1. -KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) -KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) -KBUILD_CFLAGS += $(call cc-disable-warning, packed-not-aligned) -KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) +KBUILD_CFLAGS += $(call cc-option, -Wno-unused-but-set-variable) +KBUILD_CFLAGS += $(call cc-option, -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-disable-warning, format-truncation) +KBUILD_CFLAGS += $(call cc-option, -Wno-format-truncation) endif -KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) +KBUILD_CFLAGS += $(call cc-option, -Wno-stringop-truncation) KBUILD_CFLAGS += -Wno-override-init # alias for -Wno-initializer-overrides in clang @@ -133,9 +150,9 @@ ifeq ($(call clang-min-version, 120000),y) KBUILD_CFLAGS += -Wformat-insufficient-args endif endif -KBUILD_CFLAGS += $(call cc-disable-warning, pointer-to-enum-cast) +KBUILD_CFLAGS += $(call cc-option, -Wno-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-option, -Wno-unaligned-access) KBUILD_CFLAGS += -Wno-enum-compare-conditional endif |