Re: [OE-core] [PATCH] rust: Fix multiple rlib conflict when building with rust and libstd-rs

[Richard Purdie <richard.purdie@linuxfoundation.org>]

On Thu, 2025-02-06 at 02:04 -0800, Yash Shinde via lists.openembedded.org wrote:
> From: Yash Shinde <Yash.Shinde@windriver.com>
> 
> When building an image with IMAGE_INSTALL:append = ' rust libstd-rs',
> a conflict arises due to multiple candidates for the rlib
> dependency `std`. This results in the following error:
> 
> error[E0464]: multiple candidates for `rlib` dependency `std` found
>   |
>   = note: candidate #1: /usr/lib/rustlib/x86_64-poky-linux-gnu/lib/libstd-20c3de2d9292cd03.rlib
>   = note: candidate #2: /usr/lib/rustlib/x86_64-poky-linux-gnu/lib/libstd.so
> 
> The issue seems to be from an extra copy of the rlib as both the recipes
> generate the same rlibs, causing conflicts when using std lib to compile
> rust programs in the image.
> 
> Remove the redundant rlib copy ensuring only the necessary rlib is
> present and prevent the conflict.
> 
> Signed-off-by: Yash Shinde <Yash.Shinde@windriver.com>
> ---
>  meta/recipes-devtools/rust/rust_1.81.0.bb | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/meta/recipes-devtools/rust/rust_1.81.0.bb b/meta/recipes-devtools/rust/rust_1.81.0.bb
> index 288b0fbb44..70c2f3fbf8 100644
> --- a/meta/recipes-devtools/rust/rust_1.81.0.bb
> +++ b/meta/recipes-devtools/rust/rust_1.81.0.bb
> @@ -272,6 +272,7 @@ rust_do_install:class-nativesdk() {
>      rm ${D}${libdir}/rustlib/install.log
>      rm ${D}${libdir}/rustlib/manifest*
>      rm ${D}${libdir}/rustlib/${RUST_HOST_SYS}/lib/libstd*.so
> +    rm ${D}${libdir}/rustlib/${RUST_HOST_SYS}/lib/libstd-*.rlib
>  
>      ENV_SETUP_DIR=${D}${base_prefix}/environment-setup.d
>      mkdir "${ENV_SETUP_DIR}"
> @@ -310,6 +311,7 @@ rust_do_install:class-target() {
>      rm ${D}${libdir}/rustlib/install.log
>      rm ${D}${libdir}/rustlib/manifest*
>      rm ${D}${libdir}/rustlib/${RUST_HOST_SYS}/lib/libstd*.so
> +    rm ${D}${libdir}/rustlib/${RUST_HOST_SYS}/lib/libstd-*.rlib
>  }
>  
>  addtask do_update_snapshot after do_patch

This seems to cause build failures, e.g:

https://autobuilder.yoctoproject.org/valkyrie/#/builders/19/builds/962/steps/11/logs/stdio

"error[E0463]: can't find crate for `std`"

Cheers,

Richard