Re: [PATCH V16 4/7] rust/powerpc: Set min rustc version for powerpc

On Tue, Jul 07, 2026 at 12:20:59PM +0200, Link Mauve wrote:

On Tue, Jul 07, 2026 at 12:41:37PM +0530, Mukesh Kumar Chaurasiya wrote:

quoted

On Tue, Jun 30, 2026 at 11:15:03AM +0530, Mukesh Kumar Chaurasiya wrote:

quoted

On Mon, Jun 29, 2026 at 11:11:44AM +0200, Miguel Ojeda wrote:

quoted

On Mon, Jun 29, 2026 at 6:57 AM Mukesh Kumar Chaurasiya
[off-list ref] wrote:

quoted

Sure i'll bisect. Meanwhile i would still like to get this upstream.

It is very early on the cycle -- I would suggest bisecting first.

But it is up to ppc, of course.

Cheers,
Miguel

Hey Miguel,

I was able to bisect this. This got fixed in 1.87 with
#![feature(asm_experimental_arch)].

On 1.85.0 though, with this feature allowed, the kernel gets built
perfectly without any need for 1.87.0.  You might want to require 1.87.0
only with altivec enabled, whereas on 32-bit we can build on 1.85.0 just
fine.

Even without altivec and vsx disabled, It's not building for ppc64le.

Regards,
Mukesh

quoted

1st commit that contributed towards this is
e4f539ea17a3 ("Bump to version 1.87.0")

This caused another issue to come up while building

error: extern blocks must be unsafe
  --> /home/mkchauras/.local/rustc-src/lib/rustlib/src/rust/library/core/src/../../stdarch/crates/core_arch/src/powerpc/vsx.rs:38:1
   |
38 | / extern "C" {
39 | |     #[link_name = "llvm.ppc.altivec.vperm"]
40 | |     fn vperm(
41 | |         a: vector_signed_int,
...  |
44 | |     ) -> vector_signed_int;
45 | | }
   | |_^

Which is fixed by 
a78d1b092c9c ("Update stdarch")

Both these commits went in 1.87.0 and fixed the build.

Regards,
Mukesh

quoted

Sure, I'll bisect it first.

Regards,
Mukesh

-- 
Link Mauve