diff --git a/MAINTAINERS b/MAINTAINERS index 6215fcb07770..46c4f7e3061c 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -14057,6 +14057,7 @@ Q: https://patchwork.kernel.org/project/linux-kbuild/list/ T: git git://git.kernel.org/pub/scm/linux/kernel/git/kbuild/linux.git F: Documentation/kbuild/kconfig* F: scripts/Kconfig.include +F: scripts/Kconfig.toolchain F: scripts/kconfig/ KCORE diff --git a/init/Kconfig b/init/Kconfig index 8583d9f06c52..352601b44b5c 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1,201 +1,6 @@ # 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_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) $(CLANG_FLAGS) -x c - -c -o /dev/null -Werror) - -config LD_CAN_USE_KEEP_IN_OVERLAY - # ld.lld prior to 21.0.0 did not support KEEP within an overlay description - # https://github.com/llvm/llvm-project/pull/130661 - def_bool LD_IS_BFD || LLD_VERSION >= 210000 - -config RUSTC_HAS_SPAN_FILE - def_bool RUSTC_VERSION >= 108800 - -config RUSTC_HAS_UNNECESSARY_TRANSMUTES - def_bool RUSTC_VERSION >= 108800 - -config RUSTC_HAS_FILE_WITH_NUL - def_bool RUSTC_VERSION >= 108900 - -config RUSTC_HAS_FILE_AS_C_STR - def_bool RUSTC_VERSION >= 109100 - -config RUSTC_HAS_SUSPICIOUS_RUNTIME_SYMBOL_DEFINITIONS - def_bool RUSTC_VERSION >= 109800 - -config PAHOLE_VERSION - int - default "$(PAHOLE_VERSION)" +source "scripts/Kconfig.toolchain" config CONSTRUCTORS bool diff --git a/scripts/Kconfig.toolchain b/scripts/Kconfig.toolchain new file mode 100644 index 000000000000..fac36246451f --- /dev/null +++ b/scripts/Kconfig.toolchain @@ -0,0 +1,198 @@ +# 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_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) $(CLANG_FLAGS) -x c - -c -o /dev/null -Werror) + +config LD_CAN_USE_KEEP_IN_OVERLAY + # ld.lld prior to 21.0.0 did not support KEEP within an overlay description + # https://github.com/llvm/llvm-project/pull/130661 + def_bool LD_IS_BFD || LLD_VERSION >= 210000 + +config RUSTC_HAS_SPAN_FILE + def_bool RUSTC_VERSION >= 108800 + +config RUSTC_HAS_UNNECESSARY_TRANSMUTES + def_bool RUSTC_VERSION >= 108800 + +config RUSTC_HAS_FILE_WITH_NUL + def_bool RUSTC_VERSION >= 108900 + +config RUSTC_HAS_FILE_AS_C_STR + def_bool RUSTC_VERSION >= 109100 + +config RUSTC_HAS_SUSPICIOUS_RUNTIME_SYMBOL_DEFINITIONS + def_bool RUSTC_VERSION >= 109800 + +config PAHOLE_VERSION + int + default "$(PAHOLE_VERSION)"