Profile Guided Optimization (PGO) not working on aarch64

[robsmith11]

Using the latest nightly on aarch64-unknown-linux-gnu installed with rustup, I am getting the following error when I attempt to run any crate with PGO:

$ RUSTFLAGS="-Z pgo-gen=/tmp/prof.data" cargo run                                                                   Compiling play v0.1.0 (/home/me/play)
error[E0463]: can't find crate for `profiler_builtins`                                                                  
error: aborting due to previous error

Facing the same issue. I'm trying to compile rustc with pgo.

[froydnj]

It looks like aarch64-unknown-linux-gnu is built without --enable-profiling.