how to make rust log into journalctl using release binary

Question

I developed some stuff in rust and I log some errors or warnings. I 'm using systemd_journal_logger lib to do the job. It works fine until I compile and try to use relase binary. As debug symbols are not present in it and it simply cannot log. Is there an way to make log work in this case ?

I discovered that shared_memory lib causes it

I have a simple example

use log::LevelFilter;

fn main() {
  systemd_journal_logger::init().unwrap();

  log::set_max_level( LevelFilter::Debug);

  log::warn!("A warning.");
  log::error!("An error");
}    

In my Cargo.toml I have

[dependencies]
serde =  { version = "1.0", features = ["derive"] }
serde_json = "1.0"
log = "=0.4.14"
systemd-journal-logger = "=0.3.1"

running it with

cargo run

./target/debug/mytest

or even

./target/release/mytest

works perfectly looking at journal

 journalctl -f

But if I include

 shared_memory = "0.12.2"

as a dependency

cargo build --release
./target/release/mytest

stops working

Answer 1

Ou, this is mean. shared_memory sets

[features]
default = ["log/release_max_level_off"]

This has since been fixed but not released, you can avoid the problem by downgrading the shared_memory version to <0.12.2, or carefully disabling the default features without breaking shared_memory's build…

shared_memory = { version = "0.12.2", default_features = false, features = ["log"] }