On Wed, 2021-09-01 at 09:44 +0100, Richard Purdie via lists.openembedded.org
wrote:
> Hi Esteban,
>
> On Fri, 2021-08-27 at 15:18 +0000, Kuber, Esteban wrote:
> > On 2021/8/27, 2:03 AM, "Richard Purdie"
> > <richard.pur...@linuxfoundation.org> wrote:
> > > 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.
> >
> > I'm looking at what that could be. If I can't give you the actual list
> > (from the
> > code), I can give you a patch to print out to stderr *everything* that
> > rustc is
> > setting during builds. We currently have a `-v` verbose flag in cargo that
> > gives out the full command with wich rustc in invoked, but as you say, the
> > problem is likely the environment variables at play.
>
> With some further debugging as I mentioned in my other reply, it is the
> LD_LIBRARY_PATH setting which is confusing things. Probably as a result of:
>
> https://doc.rust-lang.org/cargo/reference/environment-variables.html#dynamic-library-paths
>
> > 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.
> >
> > This is making me wonder, could it be that we are defaulting to a linker
> > that is
> > not supplied in the buildtools tar.gz? That would explain why it ends up
> > picking
> > up the system's even when changing the $PATH.
>
> It is a bit more subtle than that. The ccld script has /bin/sh as the
> interpreter which uses the host libc and host libtinfo. The LD_LIBRARY_PATH
> injected by cargo causes it to find the libtinfo in the recipe-sysroot-native
> which is incompatible with it and things then fail :(.
>
> >
> > 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
> >
> > One clarification I would like to have is, is this the *first* time you are
> > trying to build rustc in this configuration, or is this a *recent* problem
> > introduced in 1.54? Just want to make sure that my understanding that we
> > are
> > dealing with the former is correct.
>
> This is the first time we've tried this as far as I know.
>
> It is a horrible mix of different host tools and libcs from uninative,
> buildtools and the host all conflicting when LD_LIBRARY_PATH is set :(.
>
> I'm not sure how to go about resolving this.
I noticed some code in cargo. I think the code is where the sysroot path is
injected. Since rust figures out its own paths to everything it is a little
surprising this is needed and the comment suggests the author had similar
thoughts. I therefore tried the following patch:
Index: cargo/src/cargo/core/compiler/compilation.rs
===================================================================
--- cargo.orig/src/cargo/core/compiler/compilation.rs
+++ cargo/src/cargo/core/compiler/compilation.rs
@@ -273,13 +273,6 @@ impl<'cfg> Compilation<'cfg> {
));
search_path.push(self.deps_output[&kind].clone());
search_path.push(self.root_output[&kind].clone());
- // For build-std, we don't want to accidentally pull in any shared
- // libs from the sysroot that ships with rustc. This may not be
- // required (at least I cannot craft a situation where it
- // matters), but is here to be safe.
- if self.config.cli_unstable().build_std.is_none() {
- search_path.push(self.sysroot_target_libdir[&kind].clone());
- }
}
let dylib_path = paths::dylib_path();
however since I think we're running a prebuilt binary rather than the one we're
building, this does work. I'm therefore not sure how we can fix this. Is this
code something upstream might consider removing?
Cheers,
Richard
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