Unverified Commit 379b749a authored by Thomas Weißschuh's avatar Thomas Weißschuh Committed by Nathan Chancellor
Browse files

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: default avatarThomas 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: default avatarNathan Chancellor <nathan@kernel.org>
parent 76df6815

Makefile

+1 −1
Original line number Diff line number Diff line
@@ -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

scripts/Makefile.warn

+10 −13
Original line number Diff line number Diff line
@@ -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