On Thu, Feb 05, 2026 at 08:21:31PM +0530, Venkat Rao Bagalkote wrote: > > On 05/02/26 7:22 pm, Link Mauve wrote: > > On Thu, Feb 05, 2026 at 02:31:25AM +0530, Mukesh Kumar Chaurasiya (IBM) > > wrote: > > […] > > > diff --git a/rust/Makefile b/rust/Makefile > > > index ae22f2c5f0b3..c3961fd0d9a4 100644 > > > --- a/rust/Makefile > > > +++ b/rust/Makefile > > > @@ -392,10 +392,17 @@ BINDGEN_TARGET_x86 := x86_64-linux-gnu > > > BINDGEN_TARGET_arm64 := aarch64-linux-gnu > > > BINDGEN_TARGET_arm := arm-linux-gnueabi > > > BINDGEN_TARGET_loongarch := loongarch64-linux-gnusf > > > -BINDGEN_TARGET_powerpc := powerpc-linux-gnu > > > BINDGEN_TARGET_um := $(BINDGEN_TARGET_$(SUBARCH)) > > > BINDGEN_TARGET := $(BINDGEN_TARGET_$(SRCARCH)) > > > +ifdef CONFIG_PPC64 > > > +ifdef CONFIG_CPU_LITTLE_ENDIAN > > > +BINDGEN_TARGET_powerpc := powerpc64le-linux-gnu > > > +endif > > > +else > > > +BINDGEN_TARGET_powerpc := powerpc-linux-gnu > > > +endif > > You define BINDGEN_TARGET_powerpc after BINDGEN_TARGET has been set to > > the value of $(BINDGEN_TARGET_$(SRCARCH)), so it is empty and bindgen > > then gets passed --target= which makes it fail here, with this error > > message: > > ``` > > bindgen ../rust/bindings/bindings_helper.h --blocklist-type > > __kernel_s?size_t --blocklist-type __kernel_ptrdiff_t --opaque-type > > xregs_state --opaque-type desc_struct --opaque-type arch_lbr_state > > --opaque-type local_apic --opaque-type alt_instr --opaque-type x86_msi_data > > --opaque-type x86_msi_addr_lo --opaque-type kunit_try_catch --opaque-type > > spinlock --no-doc-comments --blocklist-function __list_.*_report > > --blocklist-item ARCH_SLAB_MINALIGN --blocklist-item ARCH_KMALLOC_MINALIGN > > --with-derive-custom-struct .*=MaybeZeroable --with-derive-custom-union > > .*=MaybeZeroable --rust-target 1.68 --use-core --with-derive-default > > --ctypes-prefix ffi --no-layout-tests --no-debug '.*' > > --enable-function-attribute-detection -o > > rust/bindings/bindings_generated.rs -- > > -Wp,-MMD,rust/bindings/.bindings_generated.rs.d -nostdinc > > -I../arch/powerpc/include -I./arch/powerpc/include/generated -I../include > > -I./include -I../arch/powerpc/include/uapi > > -I./arch/powerpc/include/generated/uapi -I../include/uapi > > -I./include/generated/uapi -include ../include/linux/compiler-version.h > > -include ../include/linux/kconfig.h -include > > ../include/linux/compiler_types.h -D__KERNEL__ -mbig-endian -m32 -I > > ../arch/powerpc -fmacro-prefix-map=../= -std=gnu11 -fshort-wchar > > -funsigned-char -fno-common -fno-PIE -fno-strict-aliasing -msoft-float > > -mcpu=powerpc -mno-prefixed -mno-pcrel -mno-altivec -mno-vsx -mno-mma > > -fno-asynchronous-unwind-tables -mbig-endian > > -fno-delete-null-pointer-checks -Os -fno-stack-protector > > -fomit-frame-pointer -ftrivial-auto-var-init=zero -fno-strict-overflow > > -fno-stack-check -fno-builtin-wcslen -Wall -Wextra -Wundef > > -Werror=implicit-function-declaration -Werror=implicit-int > > -Werror=return-type -Werror=strict-prototypes -Wno-format-security > > -Wno-trigraphs -Wno-frame-address -Wno-address-of-packed-member > > -Wmissing-declarations -Wmissing-prototypes -Wframe-larger-than=1280 > > -Wno-main -Wno-dangling-pointer -Wvla-larger-than=1 -Wno-pointer-sign > > -Wcast-function-type -Wno-array-bounds -Wno-stringop-overflow > > -Wno-alloc-size-larger-than -Wimplicit-fallthrough=5 -Werror=date-time > > -Werror=incompatible-pointer-types -Werror=designated-init > > -Wenum-conversion -Wunused -Wno-unused-but-set-variable > > -Wno-unused-const-variable -Wno-packed-not-aligned -Wno-format-overflow > > -Wno-format-truncation -Wno-stringop-truncation -Wno-override-init > > -Wno-missing-field-initializers -Wno-type-limits -Wno-shift-negative-value > > -Wno-maybe-uninitialized -Wno-sign-compare -Wno-unused-parameter > > -DGCC_PLUGINS -I../rust -Irust -DKBUILD_MODFILE='"rust/bindings_generated"' > > -DKBUILD_BASENAME='"bindings_generated"' > > -DKBUILD_MODNAME='"bindings_generated"' > > -D__KBUILD_MODNAME=kmod_bindings_generated -w --target= -fno-builtin > > -D__BINDGEN__ -DMODULE ; sed -Ei 's/pub const > > RUST_CONST_HELPER_([a-zA-Z0-9_]*)/pub const /g' > > rust/bindings/bindings_generated.rs > > error: unsupported option '-mbig-endian' for target '' > > error: unsupported option '-mcpu=' for target '' > > error: unsupported option '-mno-prefixed' for target '' > > error: unsupported option '-mno-pcrel' for target '' > > error: unsupported option '-mno-altivec' for target '' > > error: unsupported option '-mno-vsx' for target '' > > error: unsupported option '-mno-mma' for target '' > > error: unsupported option '-mbig-endian' for target '' > > error: unknown target triple 'unknown' > > panicked at bindgen/ir/context.rs:562:15: > > libclang error; possible causes include: > > - Invalid flag syntax > > - Unrecognized flags > > - Invalid flag arguments > > - File I/O errors > > - Host vs. target architecture mismatch > > If you encounter an error missing from this list, please file an issue or a > > PR! > > ``` > > > > Did this work on PPC64? > > On ppc64le, I am not able to get a successful Rust‑enabled build yet. > I am consistently hitting bindgen/libclang failures during the prepare > phase. > > > Build Failures: > > error: unsupported option '-mlong-double-128' for target 'unknown' > error: unsupported argument 'medium' to option '-mcmodel=' for target > 'unknown' > error: unknown target triple 'unknown' > panicked at bindgen-0.72.1/ir/context.rs:562:15: > libclang error; possible causes include: > - Invalid flag syntax > - Unrecognized flags > - Invalid flag arguments > - File I/O errors > - Host vs. target architecture mismatch > > make[2]: *** [rust/Makefile:468: rust/bindings/bindings_generated.rs] Error > 101 > make[2]: *** Deleting file 'rust/bindings/bindings_generated.rs' > > make[2]: *** [rust/Makefile:488: > rust/bindings/bindings_helpers_generated.rs] Error 101 > make[2]: *** Deleting file 'rust/bindings/bindings_helpers_generated.rs' > > make[2]: *** [rust/Makefile:474: rust/uapi/uapi_generated.rs] Error 101 > make[2]: *** Deleting file 'rust/uapi/uapi_generated.rs' > > make[2]: *** [rust/Makefile:643: rust/core.o] Error 1 > make[1]: *** [/root/linux/Makefile:1320: prepare] Error 2 > make: *** [Makefile:248: __sub-make] Error 2 > > > Regards, > > Venkat. > hey,
use rust version nightly-2026-01-28 the latest one has some issue. I just raised a bug for the rustc here[1]. [1] https://github.com/rust-lang/rust/issues/152177 Regards, Mukesh > > > + > > > # All warnings are inhibited since GCC builds are very experimental, > > > # many GCC warnings are not supported by Clang, they may only appear in > > > # some configurations, with new GCC versions, etc. > > > -- > > > 2.52.0 > > > > > With this fixed: > > Reviewed-by: Link Mauve <[email protected]> > > Tested-by: Link Mauve <[email protected]> > >
