+++ This bug was initially created as a clone of Bug #1713090 +++

Description of problem:

Trying to build Rust code on ppc64le in Koji now gives:

```
libtool: link: gcc -shared  -fPIC -DPIC  src/lib/.libs/librpmostree_1_la-rpmostree.o src/lib/.libs/librpmostree_1_la-rpmostree-db.o src/lib/.libs/librpmostree_1_la-rpmostree-package.o  -Wl,--whole-archive ./.libs/librpmostreepriv.a -Wl,--no-whole-archive  -L/builddir/build/BUILD/rpm-ostree-2019.4/libdnf-build/libdnf -ldnf -ljson-glib-1.0 -lostree-1 -lsystemd -lpolkit-gobject-1 -lrpm -lrpmio -lrepo -lsolv -larchive -lgio-2.0 -lgobject-2.0 -lglib-2.0 -lcap /builddir/build/BUILD/rpm-ostree-2019.4/target/release/librpmostree_rust.a -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld -pthread -O2 -g -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mcpu=power8 -mtune=power8 -Wl,-rpath=/usr/lib64/rpm-ostree -Wl,-z -Wl,relro -Wl,--as-needed -Wl,-z -Wl,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld -Wl,--push-state -Wl,--no-as-needed -Wl,-ldl -Wl,-lm -Wl,--pop-state   -pthread -Wl,-soname -Wl,librpmostree-1.so.1 -o .libs/librpmostree-1.so.1.0.0
BUILDSTDERR: /usr/bin/ld: /usr/lib/gcc/ppc64le-redhat-linux/9/libgcc.a(ppc64-fp.o): in function `__fixdfdi':
BUILDSTDERR: (.text+0x510): multiple definition of `__fixdfdi'; /builddir/build/BUILD/rpm-ostree-2019.4/target/release/librpmostree_rust.a(compiler_builtins-cae9ea46cd4dabd1.compiler_builtins.qr7h34vq-cgu.0.rcgu.o):(.text.__fixdfdi+0x0): first defined here
BUILDSTDERR: /usr/bin/ld: /usr/lib/gcc/ppc64le-redhat-linux/9/libgcc.a(ppc64-fp.o): in function `__fixsfdi':
BUILDSTDERR: (.text+0x5c0): multiple definition of `__fixsfdi'; /builddir/build/BUILD/rpm-ostree-2019.4/target/release/librpmostree_rust.a(compiler_builtins-cae9ea46cd4dabd1.compiler_builtins.qr7h34vq-cgu.0.rcgu.o):(.text.__fixsfdi+0x0): first defined here
BUILDSTDERR: /usr/bin/ld: /usr/lib/gcc/ppc64le-redhat-linux/9/libgcc.a(ppc64-fp.o): in function `__fixunsdfsi':
BUILDSTDERR: (.text+0x680): multiple definition of `__fixunsdfsi'; /builddir/build/BUILD/rpm-ostree-2019.4/target/release/librpmostree_rust.a(compiler_builtins-cae9ea46cd4dabd1.compiler_builtins.qr7h34vq-cgu.0.rcgu.o):(.text.__fixunsdfsi+0x0): first defined here
BUILDSTDERR: /usr/bin/ld: /usr/lib/gcc/ppc64le-redhat-linux/9/libgcc.a(ppc64-fp.o): in function `__fixunssfsi':
BUILDSTDERR: (.text+0x6e0): multiple definition of `__fixunssfsi'; /builddir/build/BUILD/rpm-ostree-2019.4/target/release/librpmostree_rust.a(compiler_builtins-cae9ea46cd4dabd1.compiler_builtins.qr7h34vq-cgu.0.rcgu.o):(.text.__fixunssfsi+0x0): first defined here
BUILDSTDERR: /usr/bin/ld: /usr/lib/gcc/ppc64le-redhat-linux/9/libgcc.a(ppc64-fp.o): in function `__floatdidf':
BUILDSTDERR: (.text+0x800): multiple definition of `__floatdidf'; /builddir/build/BUILD/rpm-ostree-2019.4/target/release/librpmostree_rust.a(compiler_builtins-cae9ea46cd4dabd1.compiler_builtins.qr7h34vq-cgu.0.rcgu.o):(.text.__floatdidf+0x0): first defined here
BUILDSTDERR: /usr/bin/ld: /usr/lib/gcc/ppc64le-redhat-linux/9/libgcc.a(ppc64-fp.o): in function `__floatundidf':
BUILDSTDERR: (.text+0x840): multiple definition of `__floatundidf'; /builddir/build/BUILD/rpm-ostree-2019.4/target/release/librpmostree_rust.a(compiler_builtins-cae9ea46cd4dabd1.compiler_builtins.qr7h34vq-cgu.0.rcgu.o):(.text.__floatundidf+0x0): first defined here
BUILDSTDERR: /usr/bin/ld: /usr/lib/gcc/ppc64le-redhat-linux/9/libgcc.a(ppc64-fp.o): in function `__floatdisf':
BUILDSTDERR: (.text+0x880): multiple definition of `__floatdisf'; /builddir/build/BUILD/rpm-ostree-2019.4/target/release/librpmostree_rust.a(compiler_builtins-cae9ea46cd4dabd1.compiler_builtins.qr7h34vq-cgu.0.rcgu.o):(.text.__floatdisf+0x0): first defined here
BUILDSTDERR: /usr/bin/ld: /usr/lib/gcc/ppc64le-redhat-linux/9/libgcc.a(ppc64-fp.o): in function `__floatundisf':
BUILDSTDERR: (.text+0x900): multiple definition of `__floatundisf'; /builddir/build/BUILD/rpm-ostree-2019.4/target/release/librpmostree_rust.a(compiler_builtins-cae9ea46cd4dabd1.compiler_builtins.qr7h34vq-cgu.0.rcgu.o):(.text.__floatundisf+0x0): first defined here
BUILDSTDERR: collect2: error: ld returned 1 exit status
```

Ref: https://kojipkgs.fedoraproject.org//work/tasks/4168/34984168/build.log
(Also added as attachment in case the above gets pruned).

Version-Release number of selected component (if applicable):

gcc-9.1.1-1.fc30.ppc64le
rust-1.34.2-1.fc30.ppc64le

How reproducible:

Always

Steps to Reproduce:
1. Try to build rpm-ostree in Koji on ppc64le

Actual results:

Build failure

Expected results:

No failure

Additional info:

Filed this against rust, though it might be a gcc issue.

I don't *think* this is an issue in rpm-ostree and is instead likely a regression in the buildroot itself. I actually hit this around two/three weeks ago too, but only on rawhide and not on f30. Unfortunately, it seems like the rawhide build logs have already been pruned, but the f30 one (which succeeded) had:

gcc-9.0.1-0.10.fc30.ppc64le
rust-1.34.0-1.fc30.ppc64le

Ref: https://kojipkgs.fedoraproject.org//packages/rpm-ostree/2019.3.5.g0da9f997/2.fc30/data/logs/ppc64le/root.log

So the most obvious difference here is the gcc-9.0 -> gcc-9.1 bump.

--- Additional comment from Josh Stone on 2019-05-22 17:03:55 PDT ---

A few data points...

I can reproduce this on f29, which has older gcc and llvm, so that probably rules those out.

rust-1.34.2-1.fc29.ppc64le
llvm-libs-7.0.1-4.fc29.ppc64le
gcc-8.3.1-2.fc29.ppc64le
binutils-2.31.1-24.fc29.ppc64le

I have a beta build of 1.35 (release tomorrow!) and that also fails:
https://koji.fedoraproject.org/koji/taskinfo?taskID=34876444
rust-1.35.0-0.1.beta.7.fc29.ppc64le

However, any of these work:
rust-1.34.1-1.fc29.ppc64le
rust-1.34.0-1.fc29.ppc64le
rust-1.33.0-1.fc29.ppc64le

1.34.1 vs 1.34.2 is really strange, because the *only* difference is the destabilization of Error::type_id. This should make *zero* difference to codegen.

I can also reproduce this with upstream rustc, from the current nightly back to 1.32.0 -- but then it works with upstream 1.31.1!

Note, upstream ppc64 cargo is broken before 1.35, so I replaced that with our /usr/bin/cargo in each case.
(ref: https://github.com/rust-lang/rust/pull/58986)

Anyway, it's really baffling that the apparent regression point is different between fedora and upstream.