driver: Only output ANSI if connected to a terminal

See #78435 for more.
2020-10-29 16:54:59 -07:00 · 2020-10-29 16:54:59 -07:00 · d282aca273
commit d282aca273
parent 6bdae9edd0
1 changed files with 1 additions and 1 deletions
--- a/compiler/rustc_driver/src/lib.rs
+++ b/compiler/rustc_driver/src/lib.rs
@ -1286,7 +1286,7 @@ pub fn init_env_logger(env: &str) {
    let filter = tracing_subscriber::EnvFilter::from_env(env);
    let layer = tracing_tree::HierarchicalLayer::default()
        .with_indent_lines(true)
-        .with_ansi(true)
+        .with_ansi(stdout_isatty())
        .with_targets(true)
        .with_thread_ids(true)
        .with_thread_names(true)