From aa017eb4dc9f070c35711fdf908171938921c422 Mon Sep 17 00:00:00 2001
From: Melody Horn <melody@boringcactus.com>
Date: Fri, 2 Apr 2021 20:11:50 -0600
Subject: ignore macro-expanded-to-empty lines

---
 src/makefile/mod.rs   | 12 +++++++-----
 src/makefile/token.rs |  8 ++++++++
 2 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/src/makefile/mod.rs b/src/makefile/mod.rs
index dfedd97..82d7d39 100644
--- a/src/makefile/mod.rs
+++ b/src/makefile/mod.rs
@@ -244,11 +244,13 @@ impl<'a> Makefile<'a> {
                     LineType::Rule => self.read_rule(&line_tokens, line_number, &mut lines_iter)?,
                     LineType::Macro => self.read_macro(&line_tokens, line_number)?,
                     LineType::Unknown => {
-                        bail!(
-                            "error: line {}: unknown line \"{}\"",
-                            line_number,
-                            line_tokens
-                        );
+                        if !line_tokens.is_empty() {
+                            bail!(
+                                "error: line {}: unknown line \"{}\"",
+                                line_number,
+                                line_tokens
+                            );
+                        }
                     }
                 }
             }
diff --git a/src/makefile/token.rs b/src/makefile/token.rs
index 8bd0179..271580a 100644
--- a/src/makefile/token.rs
+++ b/src/makefile/token.rs
@@ -111,6 +111,14 @@ impl TokenString {
             *t = t.trim_end().into();
         }
     }
+
+    pub fn is_empty(&self) -> bool {
+        match self.0.get(0) {
+            None => true,
+            Some(Token::Text(t)) if t.is_empty() => true,
+            _ => false,
+        }
+    }
 }
 
 impl fmt::Display for TokenString {
-- 
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