Arch Linux

Description:

When building packages with lto enabled rustc segfault during linking.
This happens in archlinux but not for the upstream rust package
as upstream uses a different (vendored) llvm version.
The bug has been also tracked upstream, where more information can
be found: https://github.com/rust-lang/rust/issues/57801

Here is a backtrace of the failing rustc process:

https://gist.github.com/e337646429c41d93a089aaa45b8d2375


Additional info:
* package version(s): rust-1.32, llvm-7.0.1
* config and/or log files etc:
coredump backtrace
https://gist.github.com/e337646429c41d93a089aaa45b8d2375


Steps to reproduce:

$ cargo build fd-find
....
Caused by:
Could not compile `fd-find`.

Caused by:
process didn't exit successfully: `rustc --crate-name fd /root/.cargo/registry/src/github.com-1ecc6299db9ec823/fd-find-7.2.0/src/main.rs --color always --crate-type bin --emit=dep-info,link -C opt-level=3 -C lto -C codegen-units=1 -C metadata=a3a6a7cb919634a5 -C extra-filename=-a3a6a7cb919634a5 --out-dir /tmp/cargo-installCT8S32/release/deps -L dependency=/tmp/cargo-installCT8S32/release/deps --extern ansi_term=/tmp/cargo-installCT8S32/release/deps/libansi_term-da0b45e138ff353b.rlib --extern atty=/tmp/cargo-installCT8S32/release/deps/libatty-d255fe7ee8d55655.rlib --extern clap=/tmp/cargo-installCT8S32/release/deps/libclap-f83ca700ee891f8b.rlib --extern ctrlc=/tmp/cargo-installCT8S32/release/deps/libctrlc-03b9fe7f29c143b5.rlib --extern humantime=/tmp/cargo-installCT8S32/release/deps/libhumantime-67b9f25c854b0215.rlib --extern ignore=/tmp/cargo-installCT8S32/release/deps/libignore-1259b5bca495d9c6.rlib --extern lazy_static=/tmp/cargo-installCT8S32/release/deps/liblazy_static-7deee2bf7505e8c9.rlib --extern libc=/tmp/cargo-installCT8S32/release/deps/liblibc-e3278554887eedae.rlib --extern num_cpus=/tmp/cargo-installCT8S32/release/deps/libnum_cpus-f24ed7872633de1c.rlib --extern regex=/tmp/cargo-installCT8S32/release/deps/libregex-dcae60647554bb97.rlib --extern regex_syntax=/tmp/cargo-installCT8S32/release/deps/libregex_syntax-16497b92e03853d9.rlib --cap-lints allow` (signal: 11, SIGSEGV: invalid memory reference)