[Buildroot] [PATCH 1/2] package/rust: use host libraries from HOST_DIR

[yann.morin at orange.com]

romain, All,

On 2024-02-29 14:11 +0100, Romain Naour spake thusly:
> host-rust package depends on several host packages to provide tools and
> libraries but it doesn't take into account HOST_DIR while building rustc
> compiler. Indeed, rustc needs zlib and fail to link if zlib is not
> installed on the host.
> 
>   error: could not compile `rustc_driver` (lib) due to previous error
> 
> If zlib is installed on the host, we can notice it with ldd tool (while
> it should be linked with the one provided by Buildroot host-zlib).
> 
>   ldd [...]TestRust/host/bin/rustc
>   libz.so.1 => /lib64/libz.so.1
> 
> Provide HOST_LDFLAGS using llvm.ldflags in config.toml.
> (HOST_LDFLAGS provide -L$(HOST_DIR)/lib -Wl,-rpath,$(HOST_DIR)/lib)
> 
> With that fixed, rustc_driver link with libz from HOST_DIR but the
> host-rust build still fail later due to another issue.
> 
>   error: could not compile `rustdoc-tool` (bin "rustdoc_tool_binary") due to previous error
> 
> Fixes:
> https://gitlab.com/buildroot.org/buildroot/-/jobs/6256881545
> http://autobuild.buildroot.org/results/a6b/a6b28783f29e6b729824bf42679a62f72ad5bee0
> 
> Signed-off-by: Romain Naour <romain.naour at smile.fr>
> ---
>  package/rust/rust.mk | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/package/rust/rust.mk b/package/rust/rust.mk
> index f7a5c0fcd5..c464e77f4f 100644
> --- a/package/rust/rust.mk
> +++ b/package/rust/rust.mk
> @@ -64,6 +64,7 @@ define HOST_RUST_CONFIGURE_CMDS
>  		echo 'cc = "$(TARGET_CROSS)gcc"'; \
>  		echo '[llvm]'; \
>  		echo 'ninja = false'; \
> +		echo 'ldflags = "$(HOST_LDFLAGS)"'; \

But then, we would also need to add host-zlib to
HOST_RUST_DEPENDENCIES, no?

Regards,
Yann E. MORIN.

>  	) > $(@D)/config.toml
>  endef
>  
> -- 
> 2.43.2
> 
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> https://lists.buildroot.org/mailman/listinfo/buildroot

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