Re: [OE-core] [v4] [RFC] Merge meta-rust to oe-core - Aug 19 update

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

On Fri, 2021-08-27 at 00:05 -0400, Randy MacLeod wrote:
> Thanks to Richard's dogged determination and Herculean efforts,
> the Rust recipes are now merged to the oe-core master branch.
> 
>     https://git.openembedded.org/openembedded-core/log/?qt=range&q=master
> 
> 
> There are still some known problems, such as:
> 
> 1. Tim Orling finding that Rust fails to build python-cryptography:
> 
>  
> https://git.openembedded.org/meta-openembedded-contrib/log/?h=timo/rust_python3-cryptography
> 
> Tim says that this change helps:
>  
> https://git.yoctoproject.org/cgit/cgit.cgi/poky-contrib/log/?h=timo/rustc-print-cfg-fix
> 
> 
> and:
> 
> 2. a reproducible build failure on CentOS-7:
> 
>     https://autobuilder.yoctoproject.org/typhoon/#/builders/115/builds/597
> 
> where, we see:
>     = note: /bin/sh: /lib64/libc.so.6: version `GLIBC_2.33' \
>     not found (required by \
>     /home/pokybuild/yocto-worker/reproducible-centos/build/\
>     build-st/reproducibleB/tmp/work/x86_64-linux/cargo-native/\
>     1.54.0-r0/recipe-sysroot-native/usr/lib/libtinfo.so.5)
> 
> 
> 
> 
> 
>     error: linking with `\
>     /home/pokybuild/yocto-worker/reproducible-centos/build/\
>     build-st/reproducibleB/tmp/work/x86_64-linux/cargo-native/\
>     1.54.0-r0/wrapper/target-rust-ccld` failed: exit status: 1
> 

I had a quick look at this. It reproduces if you build cargo-native on a centos7
machine with our M2 buildtools tarball in the environment of the build.

Adding the uninative relocation hack to the cargo snapshot binary with:

 do_cargo_setup_snapshot () {
        ${WORKDIR}/rust-snapshot-components/${CARGO_SNAPSHOT}/install.sh --prefix="${WORKDIR}/${CARGO_SNAPSHOT}" --disable-ldconfig
+       # Need to use uninative's loader if enabled/present since the library paths
+       # are used internally by rust and result in symbol mismatches if we don't
+       if [ ! -z "${UNINATIVE_LOADER}" -a -e "${UNINATIVE_LOADER}" ]; then
+               patchelf-uninative ${WORKDIR}/${CARGO_SNAPSHOT}/bin/cargo --set-interpreter ${UNINATIVE_LOADER}
+       fi
 }

didn't help.

Running the command it mentions failing by hand in the same toolchain enabled
shell works. It therefore seems likely that something rust is putting into the
environment is breaking things. What that is, I don't know, I'm out of time to
debug further.

It looks to me like it is using the ld from the host instead of the buildtools
tarball. I did change tmp/work/x86_64-linux/cargo-native/1.54.0-
r0/wrapper/target-rust-ccld to a full path to gcc and messed with PATH to ensure
it would find "our" ld first but that didn't help.

In the error output is some:

Usage: which [options] [--] COMMAND [...]
Write the full path of COMMAND(s) to standard output.

suggesting some which call might not be compatible with centos7?

Cheers,

Richard