From 6c0be6913dd0bcbb7e17a3e2a4daa45fcc8f5103 Mon Sep 17 00:00:00 2001
From: mat <git@matdoes.dev>
Date: Fri, 30 Jan 2026 00:02:36 +0500
Subject: warn if pathfinder is running without optimizations, and other minor
 fixes

---
 azalea/build.rs              | 11 +++++++++++
 azalea/src/pathfinder/mod.rs | 12 +++++++++++-
 2 files changed, 22 insertions(+), 1 deletion(-)

(limited to 'azalea')

diff --git a/azalea/build.rs b/azalea/build.rs
index faed1365..9dd6b738 100644
--- a/azalea/build.rs
+++ b/azalea/build.rs
@@ -1,6 +1,17 @@
 use std::{env, process::Command};
 
 fn main() {
+    check_nightly();
+
+    // save the optimization level, used by the pathfinder to warn if optimizations
+    // are off
+    println!(
+        "cargo::rustc-env=OPT_LEVEL={}",
+        env::var("OPT_LEVEL").unwrap()
+    );
+}
+
+fn check_nightly() {
     // If using `rustup`, check the toolchain via `RUSTUP_TOOLCHAIN`
     if let Ok(toolchain) = env::var("RUSTUP_TOOLCHAIN") {
         if toolchain.contains("nightly") {
diff --git a/azalea/src/pathfinder/mod.rs b/azalea/src/pathfinder/mod.rs
index 8df04b14..6f1a0d8a 100644
--- a/azalea/src/pathfinder/mod.rs
+++ b/azalea/src/pathfinder/mod.rs
@@ -32,7 +32,7 @@ use std::{
     collections::VecDeque,
     sync::{
         Arc,
-        atomic::{self, AtomicUsize},
+        atomic::{self, AtomicBool, AtomicUsize},
     },
     thread,
     time::{Duration, Instant},
@@ -306,6 +306,16 @@ pub fn goto_listener(
             continue;
         };
 
+        // this env variable is set from the build.rs
+        if env!("OPT_LEVEL") == "0" {
+            static WARNED: AtomicBool = AtomicBool::new(false);
+            if !WARNED.swap(true, atomic::Ordering::Relaxed) {
+                warn!(
+                    "Azalea was compiled with no optimizations, which may result in significantly reduced pathfinding performance. Consider following the steps at https://azalea.matdoes.dev/azalea/#optimization for faster performance in debug mode."
+                )
+            }
+        }
+
         let cur_pos = player_pos_to_block_pos(**position);
 
         if event.goal.success(cur_pos) {
-- 
cgit v1.2.3