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I'm experimentally rebuilding rawhide with the not-yet-released GCC 15 to see if anything breaks, and to help write the porting guide. See https://fedoraproject.org/wiki/F42-gcc-15-mass-prebuild My test build with GCC 15 failed: https://copr.fedorainfracloud.org/coprs/dmalcolm/gcc-15-smoketest-3.failed/build/8476572/ Looking at the failure logs e.g. https://download.copr.fedorainfracloud.org/results/dmalcolm/gcc-15-smoketest-3.failed/fedora-rawhide-x86_64/08476572-kernel/builder-live.log.gz I see: In file included from ./include/uapi/linux/posix_types.h:5, from ./include/uapi/linux/types.h:14, from ./include/linux/types.h:6, from ./include/linux/kasan-checks.h:5, from ./include/asm-generic/rwonce.h:26, from ./arch/x86/include/generated/asm/rwonce.h:1, from ./include/linux/compiler.h:324, from ./include/linux/build_bug.h:5, from ./include/linux/init.h:5, from ./include/linux/efi.h:15, from drivers/firmware/efi/libstub/efi-stub-helper.c:12: ./include/linux/stddef.h:11:9: error: expected identifier before ‘false’ 11 | false = 0, | ^~~~~ ./include/linux/types.h:35:33: error: two or more data types in declaration specifiers 35 | typedef _Bool bool; | ^~~~ ./include/linux/types.h:35:1: warning: useless type name in empty declaration 35 | typedef _Bool bool; | ^~~~~~~ This is probably due to GCC 15 now defaulting to -std=gnu23, whereas GCC 14 defaulted to -std=gnu17, and "bool" is a reserved word in C23. The code should ideally be ported to support C23 (but it could probably be worked around by manually adding -std=gnu17 to the C build flags) Reproducible: Always
aarch64 build: https://download.copr.fedorainfracloud.org/results/dmalcolm/gcc-15-smoketest-3.failed/fedora-rawhide-aarch64/08476572-kernel/builder-live.log.gz failed with: drivers/gpu/drm/panthor/panthor_fw.c: In function ‘panthor_fw_read_build_info’: drivers/gpu/drm/panthor/panthor_fw.c:651:53: error: initializer-string for array of ‘char’ is too long [-Werror=unterminated-string-initialization] 651 | const char git_sha_header[sizeof(header)] = "git_sha: "; | ^~~~~~~~~~~
Build on ppc64le succeeded: https://download.copr.fedorainfracloud.org/results/dmalcolm/gcc-15-smoketest-3.failed/fedora-rawhide-ppc64le/08476572-kernel/builder-live.log.gz Builds on x86_64 and s390x failed with "bool" keyword issues; x86_64 as per comment #0; s390x failing with: In file included from ./include/uapi/linux/posix_types.h:5, from ./include/uapi/linux/types.h:14, from ./include/linux/types.h:6, from ./include/linux/kasan-checks.h:5, from ./include/asm-generic/rwonce.h:26, from ./arch/s390/include/asm/rwonce.h:29, from ./include/linux/compiler.h:324, from ./include/linux/export.h:5, from ./include/linux/linkage.h:7, from ./include/linux/vmcore_info.h:5, from ./include/linux/kexec.h:18, from arch/s390/purgatory/purgatory.c:10: ./include/linux/stddef.h:11:9: error: expected identifier before ‘false’ 11 | false = 0, | ^~~~~ ./include/linux/types.h:35:33: error: two or more data types in declaration specifiers 35 | typedef _Bool bool; | ^~~~ ./include/linux/types.h:35:1: warning: useless type name in empty declaration 35 | typedef _Bool bool; | ^~~~~~~ https://download.copr.fedorainfracloud.org/results/dmalcolm/gcc-15-smoketest-3.failed/fedora-rawhide-s390x/08476572-kernel/builder-live.log.gz
FWIW I've updated the error message in more recent builds of GCC; see: https://gcc.gnu.org/gcc-15/porting_to.html#c23-new-keywords
Looks like this was addressed in https://src.fedoraproject.org/rpms/kernel/c/39f6da9eabe9fa880a8b720231eb3010e99e4f51 which has: +KBUILD_CFLAGS += -std=gnu11 in arch/x86/boot/compressed/Makefile and a bunch of other changes that seem to be C23 related. If so, presumably this can be closed out.
That part is hopefully fixed, I've seen flying tons of patches about that. But your comment has also drivers/gpu/drm/panthor/panthor_fw.c: In function ‘panthor_fw_read_build_info’: drivers/gpu/drm/panthor/panthor_fw.c:651:53: error: initializer-string for array of ‘char’ is too long [-Werror=unterminated-string-initialization] 651 | const char git_sha_header[sizeof(header)] = "git_sha: "; | ^~~~~~~~~~~ part, that is a semi-new warning and dunno if kernel has been tweaked for that. There is a possibility the warning will change, see e.g. https://gcc.gnu.org/pipermail/gcc-patches/2024-December/thread.html#671714 https://gcc.gnu.org/pipermail/gcc-patches/2025-January/672738.html https://gcc.gnu.org/pipermail/gcc-patches/2025-February/thread.html#675137 but it hasn't happened yet.
We are building now, and have been for a bit. Of the 8 patches that were required to build after the toolchain update, 6 are now upstream. https://gitlab.com/cki-project/kernel-ark/-/merge_requests/3611/diffs?commit_id=da91c927eb1d424bd82d8023d4ce13ddae83289b Is the patch which deals with disabling -Werror=unterminated-string-initialization and I don't know if it will and upstream or not.
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