1 files changed, 12 insertions, 4 deletions
diff --git a/src/makefile/macro.rs b/src/makefile/macro.rs
index c8a9542..6a456af 100644
--- a/src/makefile/macro.rs
+++ b/src/makefile/macro.rs
@@ -1,11 +1,8 @@
-#[cfg(feature = "full")]
 use std::cell::RefCell;
 use std::collections::HashMap;
-#[cfg(feature = "full")]
 use std::collections::HashSet;
 use std::env;
 use std::fmt;
-#[cfg(feature = "full")]
 use std::rc::Rc;
 
 use eyre::{bail, Result, WrapErr};
@@ -102,6 +99,7 @@ pub struct Set<'parent, 'lookup> {
     pub to_eval: Rc<RefCell<Vec<String>>>,
     #[cfg(feature = "full")]
     pub exported: ExportConfig,
+    warnings: Rc<RefCell<HashSet<String>>>,
 }
 
 impl<'parent, 'lookup> Set<'parent, 'lookup> {
@@ -114,6 +112,7 @@ impl<'parent, 'lookup> Set<'parent, 'lookup> {
             to_eval: Rc::new(RefCell::new(Vec::new())),
             #[cfg(feature = "full")]
             exported: ExportConfig::only(),
+            warnings: Default::default(),
         }
     }
 
@@ -206,6 +205,13 @@ impl<'parent, 'lookup> Set<'parent, 'lookup> {
         self.data.extend(other);
     }
 
+    fn warn(&self, text: String) {
+        if !self.warnings.borrow().contains(&text) {
+            log::warn!("{}", &text);
+            self.warnings.borrow_mut().insert(text);
+        }
+    }
+
     pub fn expand(&self, text: &TokenString) -> Result<String> {
         let mut result = String::new();
         for token in text.tokens() {
@@ -224,7 +230,7 @@ impl<'parent, 'lookup> Set<'parent, 'lookup> {
                     } else {
                         self.get(&name).map_or_else(
                             || {
-                                log::warn!("undefined macro {}", name);
+                                self.warn(format!("undefined macro {}", name));
                                 Ok(String::new())
                             },
                             |x| self.expand(&x.text),
@@ -294,6 +300,7 @@ impl<'parent, 'lookup> Set<'parent, 'lookup> {
             to_eval: Rc::clone(&self.to_eval),
             #[cfg(feature = "full")]
             exported: self.exported.same_type(),
+            warnings: Rc::clone(&self.warnings),
         }
     }
 
@@ -306,6 +313,7 @@ impl<'parent, 'lookup> Set<'parent, 'lookup> {
             to_eval: Rc::clone(&self.to_eval),
             #[cfg(feature = "full")]
             exported: self.exported.same_type(),
+            warnings: Rc::clone(&self.warnings),
         }
     }