allow leading `-` to suppress errors on `include`

1 files changed, 10 insertions, 4 deletions

diff --git a/src/makefile/input.rs b/src/makefile/input.rs
index ecf195a..283842f 100644
--- a/src/makefile/input.rs
+++ b/src/makefile/input.rs
@@ -229,7 +229,11 @@ impl<'a, 'parent, R: BufRead> MakefileReader<'a, 'parent, R> {
             let line = line?;
 
             // handle include lines
-            if let Some(line) = line.strip_prefix("include ") {
+            let original_line = &line;
+            if let Some(line) = line
+                .strip_prefix("include ")
+                .or(line.strip_prefix("-include "))
+            {
                 // remove extra leading space
                 let line = line.trim_start();
                 let line = self.expand_macros(&tokenize(line)?)?;
@@ -244,9 +248,11 @@ impl<'a, 'parent, R: BufRead> MakefileReader<'a, 'parent, R> {
                         let child = child.finish();
                         self.extend(child);
                     } else {
-                        // TODO handle non-file-not-found errors
-                        log::error!("included makefile {} not found", field);
-                        self.failed_includes.push(field.to_owned());
+                        if !original_line.starts_with('-') {
+                            // TODO handle non-file-not-found errors
+                            log::error!("included makefile {} not found", field);
+                            self.failed_includes.push(field.to_owned());
+                        }
                     }
                 }
                 continue;