Rudraksha Gupta 6298a28a2c rust: arm: fix unknown (to Clang) argument '-mno-fdpic' ... [ Upstream commit 977c4308ee ] Currently rust on arm fails to compile due to '-mno-fdpic'. This flag disables a GCC feature that we don't want for kernel builds, so let's skip it as it doesn't apply to Clang. UPD include/generated/asm-offsets.h CALL scripts/checksyscalls.sh RUSTC L rust/core.o BINDGEN rust/bindings/bindings_generated.rs BINDGEN rust/bindings/bindings_helpers_generated.rs CC rust/helpers/helpers.o Unable to generate bindings: clang diagnosed error: error: unknown argument: '-mno-fdpic' make[2]: *** [rust/Makefile:369: rust/bindings/bindings_helpers_generated.rs] Error 1 make[2]: *** Deleting file 'rust/bindings/bindings_helpers_generated.rs' make[2]: *** Waiting for unfinished jobs.... Unable to generate bindings: clang diagnosed error: error: unknown argument: '-mno-fdpic' make[2]: *** [rust/Makefile:349: rust/bindings/bindings_generated.rs] Error 1 make[2]: *** Deleting file 'rust/bindings/bindings_generated.rs' make[1]: *** [/home/pmos/build/src/linux-next-next-20250521/Makefile:1285: prepare] Error 2 make: *** [Makefile:248: __sub-make] Error 2 [ Naresh provided the draft diff [1]. Ben explained [2]: FDPIC is only relevant with no-MMU targets, and then only for userspace. When configured for the arm-*-uclinuxfdpiceabi target, GCC enables FDPIC by default to facilitate compiling userspace programs. FDPIC is never used for the kernel, and we pass -mno-fdpic when building the kernel to override the default and make sure FDPIC is disabled. and [3]: -mno-fdpic disables a GCC feature that we don't want for kernel builds. clang does not support this feature, so it always behaves as though -mno-fdpic is passed. Therefore, it should be fine to mix the two, at least as far as FDPIC is concerned. [1] https://lore.kernel.org/rust-for-linux/CA+G9fYt4otQK4pHv8pJBW9e28yHSGCDncKquwuJiJ_1ou0pq0w@mail.gmail.com/ [2] https://lore.kernel.org/rust-for-linux/aAKrq2InExQk7f_k@dell-precision-5540/ [3] https://lore.kernel.org/rust-for-linux/aAo_F_UP1Gd4jHlZ@dell-precision-5540/ - Miguel ] Reported-by: Linux Kernel Functional Testing <lkft@linaro.org> Closes: https://lore.kernel.org/all/CA+G9fYvOanQBYXKSg7C6EU30k8sTRC0JRPJXYu7wWK51w38QUQ@mail.gmail.com/ Suggested-by: Miguel Ojeda <ojeda@kernel.org> Acked-by: Naresh Kamboju <naresh.kamboju@linaro.org> Signed-off-by: Rudraksha Gupta <guptarud@gmail.com> Link: https://lore.kernel.org/r/20250522-rust-mno-fdpic-arm-fix-v2-1-a6f691d9c198@gmail.com [ Reworded title. - Miguel ] Signed-off-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2025-07-06 11:01:33 +02:00
..
bindings	rust: clean Rust 1.88.0's unnecessary_transmutes lint	2025-05-18 08:24:51 +02:00
helpers	rust: alloc: implement KVmalloc allocator	2025-03-13 13:01:44 +01:00
kernel	rust: alloc: add missing invariant in Vec::set_len()	2025-06-19 15:32:09 +02:00
macros	rust: module: place cleanup_module() in .exit.text section	2025-07-06 11:01:33 +02:00
uapi	rust: clean Rust 1.88.0's unnecessary_transmutes lint	2025-05-18 08:24:51 +02:00
.gitignore	rust: support running Rust documentation tests as KUnit ones	2023-07-19 09:32:53 -06:00
bindgen_parameters	rust: map __kernel_size_t and friends also to usize/isize	2025-03-13 13:01:48 +01:00
build_error.rs	rust: add build_error crate	2022-12-04 01:59:16 +01:00
compiler_builtins.rs	rust: add intrinsics to fix -Os builds	2024-08-10 00:05:10 +02:00
exports.c	kbuild: rust: remove the alloc crate and GlobalAlloc	2025-03-13 13:01:47 +01:00
ffi.rs	rust: map long to isize and char to u8	2025-03-13 13:02:13 +01:00
Makefile	rust: arm: fix unknown (to Clang) argument '-mno-fdpic'	2025-07-06 11:01:33 +02:00