Polonius performance problem on nix and libc

[joshtriplett]

Version: rustc 1.47.0-nightly (663d2f5cd 2020-08-22)

To reproduce, create a new binary crate, add nix = "0.18.0" to the [dependencies] section, and then run cargo check on it, followed by RUSTFLAGS=-Zpolonius cargo check.

Without polonius, this took 5.56s for me. With polonius, this took 55.95s, an 11x increase in check time.

To avoid a moving target here, these builds used libc v0.2.76 and nix v0.18.0.

[alex]

AFAIK, polonius has changed its implementation strategy considerable in the last 4+ years. Should this be closed?

[Neutron3529]

AFAIK, polonius has changed its implementation strategy considerable in the last 4+ years. Should this be closed?

Nope, I've found some similar things.