From 1dea4433403f2a3084bf583a658901d8239d4545 Mon Sep 17 00:00:00 2001
From: Alex S <alex0player@gmail.com>
Date: Sat, 19 Jun 2021 14:19:39 +0300
Subject: [PATCH] Better compile error for not using resolver=2.

---
 wgpu-hal/src/lib.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/wgpu-hal/src/lib.rs b/wgpu-hal/src/lib.rs
index 97e3c7c43..414240673 100644
--- a/wgpu-hal/src/lib.rs
+++ b/wgpu-hal/src/lib.rs
@@ -45,8 +45,11 @@
     clippy::pattern_type_mismatch,
 )]
 
+#[cfg(all(feature = "metal", not(any(target_os = "macos", target_os = "ios"))))]
+compile_error!("Metal backend enabled on non-Apple OS. If your project is not using resolver=\"2\" in Cargo.toml, it should.");
+
 mod empty;
-#[cfg(feature = "metal")]
+#[cfg(all(feature = "metal", any(target_os = "macos", target_os = "ios")))]
 mod metal;
 #[cfg(feature = "vulkan")]
 mod vulkan;