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linux/scripts/Kconfig.toolchain
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Linus Torvalds bb29b957ea Merge tag 'kbuild-7.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kbuild/linux 
Pull Kbuild / Kconfig updates from Nathan Chancellor:
 "Kbuild:

   - Suppress compiler flags in debug info for external module builds

   - Use '-fmacro-prefix-map' in more places in the build

   - Merge initial set of changes from Lorenzo's speed up series, along
     with some fixes found through testing:

     - Avoid allocating .modinfo in vmlinux

     - Speed up kallsyms by indexing symbols by token and outputting
       binary data to disk directly then including in assembly via
       .incbin

     - Don't sort $(NM) output when unnecessary

     - Only emit relocations on the final vmlinx link

     - Reimplement mksysmap in C

     - Move many cc-option and ld-option calls into the Kconfig stage to
       cache their results

     - Use pigz for gzip compression when available

   - Move gen_init_cpio and gen_initramfs.sh from usr/ to scripts/

   - Add a TOML configuration to scripts/container and update
     documentation accordingly

   - Add a generic, opt-in mechanism for checking that headers can
     compile standalone

   - Update machine function splitting argument for LLVM 24 rename in
     AutoFDO build

   - Miscellaneous minor clean ups, fixes, and hardening, mostly
     found/fixed via LLMs

  Kconfig:

   - Turn recursive ranges into an error

   - Fix savedefconfig for defaults that were adjusted for being out of
     range and revert a previously applied workaround

   - Improvements and hardening around integer and hexadecimal values

   - Emit a warning when selecting or implying a choice symbol, which
     has no effect

   - Emit a warning when KCONFIG_PROBABILITY is malformed

   - Introduce def_string / def_int / def_hex to mirror the existing
     def_bool / def_tristate to succinctly set a value and type at the
     same time.

   - Add cc-option-str and ld-option-str macros to act like Kbuild's
     cc-option and ld-option, returning the string when the option is
     supported, allowing many checks to be moved into Kconfig

   - Minor usability improvements to Kconfig tests"

* tag 'kbuild-7.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kbuild/linux: (59 commits)
  kbuild: AutoFDO: Update split machine function argument for upstream rename
  kbuild: Mark the initcall ordering recipe as recursive
  kbuild: Mark the gzip recipes as recursive
  localmodconfig: Explicitly report boolean configs during integrity check
  scripts/make_fit: Ignore schema checks when decomposing DTBs
  clang-tools: Import os for broken pipe handling
  kconfig: use the value argument in sym_get_near_range_bound()
  kconfig: fix infinite loop in conf_choice() when no choice value is visible
  kconfig: cleanup stale comment about 'keys' array
  kconfig: Improve ergonomics around disabling warnings with cc-option
  scripts/Kconfig.toolchain: Drop compiler symbols from dependencies
  checkkconfigsymbols.py: Parse Git status output line by line
  gen_init_cpio: stop parsing on lines with a missing argument list
  .gitignore: drop Module.markers
  .gitignore: ignore pacman package signatures
  kbuild: add header check facility as a manually run static analyzer
  Documentation: dev-tools: refer to user ID rather than id
  Documentation: dev-tools: update container.rst with config file
  scripts: add TOML config to container tool
  kconfig: tests: {old,save}defconfig: Forward dynamic keyword arguments
  ...
2026-10-21 10:45:44 -10:00

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# SPDX-License-Identifier: GPL-2.0-only
config CC_VERSION_TEXT
string
default "$(CC_VERSION_TEXT)"
help
This is used in unclear ways:
- Re-run Kconfig when the compiler is updated
The 'default' property references the environment variable,
CC_VERSION_TEXT so it is recorded in include/config/auto.conf.cmd.
When the compiler is updated, Kconfig will be invoked.
- Ensure full rebuild when the compiler is updated
include/linux/compiler-version.h contains this option in the comment
line so fixdep adds include/config/CC_VERSION_TEXT into the
auto-generated dependency. When the compiler is updated, syncconfig
will touch it and then every file will be rebuilt.
config CC_IS_GCC
def_bool $(success,test "$(cc-name)" = GCC)
config GCC_VERSION
int
default $(cc-version) if CC_IS_GCC
default 0
config CC_IS_CLANG
def_bool $(success,test "$(cc-name)" = Clang)
config CLANG_VERSION
int
default $(cc-version) if CC_IS_CLANG
default 0
config AS_IS_GNU
def_bool $(success,test "$(as-name)" = GNU)
config AS_IS_LLVM
def_bool $(success,test "$(as-name)" = LLVM)
config AS_VERSION
int
# Use clang version if this is the integrated assembler
default CLANG_VERSION if AS_IS_LLVM
default $(as-version)
config LD_IS_BFD
def_bool $(success,test "$(ld-name)" = BFD)
config LD_VERSION
int
default $(ld-version) if LD_IS_BFD
default 0
config LD_IS_LLD
def_bool $(success,test "$(ld-name)" = LLD)
config LLD_VERSION
int
default $(ld-version) if LD_IS_LLD
default 0
config RUSTC_VERSION
int
default $(rustc-version)
help
It does not depend on `RUST` since that one may need to use the version
in a `depends on`.
config RUST_IS_AVAILABLE
def_bool $(success,$(srctree)/scripts/rust_is_available.sh)
help
This shows whether a suitable Rust toolchain is available (found).
Please see Documentation/rust/quick-start.rst for instructions on how
to satisfy the build requirements of Rust support.
In particular, the Makefile target 'rustavailable' is useful to check
why the Rust toolchain is not being detected.
config RUSTC_LLVM_VERSION
int
default $(rustc-llvm-version)
config RUSTC_LLVM_MAJOR_VERSION
int
default $(shell,expr $(rustc-llvm-version) / 10000)
config RUSTC_CLANG_LLVM_COMPATIBLE
bool
default y if CC_IS_CLANG && RUSTC_LLVM_MAJOR_VERSION = $(shell,expr $(cc-version) / 10000)
help
This indicates whether Rust and Clang use LLVM of the same major
version.
Operations involving handling LLVM IR or bitcode (e.g. cross-language
LTO) require the same LLVM major version to work properly. For best
compatibility it is recommended that the exact same LLVM is used.
config ARCH_HAS_CC_CAN_LINK
bool
config CC_CAN_LINK
bool
default ARCH_CC_CAN_LINK if ARCH_HAS_CC_CAN_LINK
default $(cc_can_link_user,$(m64-flag)) if 64BIT
default $(cc_can_link_user,$(m32-flag))
# Fixed in GCC 14, 13.3, 12.4 and 11.5
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113921
config GCC_ASM_GOTO_OUTPUT_BROKEN
bool
depends on CC_IS_GCC
default y if GCC_VERSION < 110500
default y if GCC_VERSION >= 120000 && GCC_VERSION < 120400
default y if GCC_VERSION >= 130000 && GCC_VERSION < 130300
config CC_HAS_ASM_GOTO_OUTPUT
def_bool y
depends on !GCC_ASM_GOTO_OUTPUT_BROKEN
depends on $(success,echo 'int foo(int x) { asm goto ("": "=r"(x) ::: bar); return x; bar: return 0; }' | $(CC) -x c - -c -o /dev/null)
config CC_HAS_ASM_GOTO_TIED_OUTPUT
depends on CC_HAS_ASM_GOTO_OUTPUT
# Detect buggy gcc and clang, fixed in gcc-11 clang-14.
def_bool $(success,echo 'int foo(int *x) { asm goto (".long (%l[bar]) - .": "+m"(*x) ::: bar); return *x; bar: return 0; }' | $CC -x c - -c -o /dev/null)
config TOOLS_SUPPORT_RELR
def_bool $(success,env "CC=$(CC)" "LD=$(LD)" "NM=$(NM)" "OBJCOPY=$(OBJCOPY)" $(srctree)/scripts/tools-support-relr.sh)
config CC_HAS_ASM_INLINE
def_bool $(success,echo 'void foo(void) { asm inline (""); }' | $(CC) -x c - -c -o /dev/null)
config CC_HAS_ASSUME
bool
# clang needs to be at least 19.1.0 since the meaning of the assume
# attribute changed:
# https://github.com/llvm/llvm-project/commit/c44fa3e8a9a44c2e9a575768a3c185354b9f6c17
default y if CC_IS_CLANG && CLANG_VERSION >= 190100
# supported since gcc 13.1.0
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106654
default y if CC_IS_GCC && GCC_VERSION >= 130100
config CC_HAS_NO_PROFILE_FN_ATTR
def_bool $(success,echo '__attribute__((no_profile_instrument_function)) int x();' | $(CC) -x c - -c -o /dev/null -Werror)
config CC_OPT_ZERO_INIT_PADDING_BITS
def_string "$(cc-option-str,-fzero-init-padding-bits=all)"
config CC_OPT_NO_ADDRSIG
def_string "$(cc-option-str,-fno-addrsig)"
config CC_OPT_DIAGNOSTICS_SHOW_CONTEXT
def_string "$(cc-option-str,-fdiagnostics-show-context=2)"
config CC_OPT_DIAGNOSTICS_SHOW_INLINING_CHAIN
def_string "$(cc-option-str,-fdiagnostics-show-inlining-chain)"
config CC_OPT_STRICT_FLEX_ARRAYS
def_string "$(cc-option-str,-fstrict-flex-arrays=3)"
# gcc-10 renamed --param=allow-store-data-races=0 to -fno-allow-store-data-races
config CC_OPT_ALLOW_STORE_DATA_RACES_PARAM
def_string "$(cc-option-str,--param=allow-store-data-races=0)"
config CC_OPT_NO_ALLOW_STORE_DATA_RACES
def_string "$(cc-option-str,-fno-allow-store-data-races)"
config CC_HAS_MNOP_MCOUNT
def_bool $(cc-option,-mnop-mcount)
# s390-linux-gnu-gcc did not support -mfentry until gcc-9.
config CC_HAS_MFENTRY
def_bool $(cc-option,-mfentry)
config LD_OPT_FORCE_GROUP_ALLOCATION
def_string "$(ld-option-str,--force-group-allocation)"
config LD_OPT_NO_WARN_RWX_SEGMENTS
def_string "$(ld-option-str,--no-warn-rwx-segments)"
config CC_OPT_WNO_ADDRESS_OF_PACKED_MEMBER
def_string "$(cc-option-str,-Wno-address-of-packed-member)"
config CC_OPT_WNO_FORMAT_OVERFLOW_NON_KPRINTF
def_string "$(cc-option-str,-Wno-format-overflow-non-kprintf)"
config CC_OPT_WNO_FORMAT_TRUNCATION_NON_KPRINTF
def_string "$(cc-option-str,-Wno-format-truncation-non-kprintf)"
config CC_OPT_WNO_DEFAULT_CONST_INIT_UNSAFE
def_string "$(cc-option-str,-Wno-default-const-init-unsafe)"
config CC_OPT_WNO_DANGLING_POINTER
def_string "$(cc-option-str,-Wno-dangling-pointer)"
config CC_OPT_WVLA_LARGER_THAN
def_string "$(cc-option-str,-Wvla-larger-than=1)"
config CC_HAS_WSTRINGOP_OVERFLOW
def_bool $(cc-option,-Wstringop-overflow)
config CC_OPT_WNO_UNTERMINATED_STRING_INITIALIZATION
def_string "$(cc-option-str,-Wno-unterminated-string-initialization)"
config CC_OPT_WERROR_DESIGNATED_INIT
def_string "$(cc-option-str,-Werror=designated-init)"
config CC_OPT_WENUM_CONVERSION
def_string "$(cc-option-str,-Wenum-conversion)"
config CC_OPT_WNO_PACKED_NOT_ALIGNED
def_string "$(cc-option-str,-Wno-packed-not-aligned)"
config CC_OPT_WNO_FORMAT_OVERFLOW
def_string "$(cc-option-str,-Wno-format-overflow)"
config CC_OPT_WNO_STRINGOP_TRUNCATION
def_string "$(cc-option-str,-Wno-stringop-truncation)"
config CC_HAS_COUNTED_BY
bool
# clang needs to be at least 20.1.0 to avoid potential crashes
# when building structures that contain __counted_by
# https://github.com/ClangBuiltLinux/linux/issues/2114
# https://github.com/llvm/llvm-project/commit/160fb1121cdf703c3ef5e61fb26c5659eb581489
default y if CC_IS_CLANG && CLANG_VERSION >= 200100
# supported since gcc 15.1.0
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108896
default y if CC_IS_GCC && GCC_VERSION >= 150100
config CC_HAS_COUNTED_BY_PTR
bool
# supported since clang 22
default y if CC_IS_CLANG && CLANG_VERSION >= 220100
# supported since gcc 16.0.0
default y if CC_IS_GCC && GCC_VERSION >= 160000
config CC_HAS_BROKEN_COUNTED_BY_REF
bool
# https://github.com/llvm/llvm-project/issues/182575
default y if CC_IS_CLANG && CLANG_VERSION < 220100
config CC_HAS_ALLOC_TOKEN
def_bool $(cc-option,-falloc-token-max=123)
config CC_HAS_MULTIDIMENSIONAL_NONSTRING
def_bool $(success,echo 'char tag[][4] __attribute__((__nonstring__)) = { };' | $(CC) $(CLANG_FLAGS) -x c - -c -o /dev/null -Werror)
config CC_OPT_INLINE_MEMSET
string
default "-finline-stringops=memset" if $(cc-option,-finline-stringops=memset)
default "-mllvm -max-store-memset=4294967294" if $(cc-option,-mllvm -max-store-memset=4294967294)
config LD_CAN_USE_KEEP_IN_OVERLAY
# ld.lld prior to 21.0.0 did not support KEEP within an overlay description
# https://github.com/llvm/llvm-project/pull/130661
def_bool LD_IS_BFD || LLD_VERSION >= 210000
config RUSTC_HAS_UNNECESSARY_TRANSMUTES
def_bool RUSTC_VERSION >= 108800
config RUSTC_HAS_FILE_WITH_NUL
def_bool RUSTC_VERSION >= 108900
config RUSTC_HAS_FILE_AS_C_STR
def_bool RUSTC_VERSION >= 109100
config RUSTC_HAS_SUSPICIOUS_RUNTIME_SYMBOL_DEFINITIONS
def_bool RUSTC_VERSION >= 109800
config PAHOLE_VERSION
int
default "$(PAHOLE_VERSION)"
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