From 0f6f868b2e255e9aeeaadd057904c166f66ef198 Mon Sep 17 00:00:00 2001
From: lights0123 <developer@lights0123.com>
Date: Sun, 9 Aug 2020 13:26:55 -0400
Subject: [PATCH] Cause an error in the #[entry] macro instead of avr-device

---
 macros/src/lib.rs | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/macros/src/lib.rs b/macros/src/lib.rs
index 6498f68..eb1f158 100644
--- a/macros/src/lib.rs
+++ b/macros/src/lib.rs
@@ -58,7 +58,14 @@ pub fn entry(
     let stmts = block.stmts;
     let unsafety = f.sig.unsafety;
 
-    quote::quote!(
+    quote::quote! (
+        #[cfg(not(any(doc, target_arch = "avr")))]
+        compile_error!(
+            "Ensure that you are using an AVR target! You may need to change \
+       directories or pass a --target flag to cargo. See
+       https://github.com/Rahix/avr-device/pull/41 for more details."
+        );
+
         #(#attrs)*
         #[doc(hidden)]
         #[export_name = "main"]