implement secondary expansion

1 files changed, 17 insertions, 4 deletions

diff --git a/src/makefile/input.rs b/src/makefile/input.rs
index 2879b63..74742f9 100644
--- a/src/makefile/input.rs
+++ b/src/makefile/input.rs
@@ -614,6 +614,22 @@ impl<'a, 'parent, R: BufRead> MakefileReader<'a, 'parent, R> {
                 #[cfg(feature = "full")]
                 Some(&mut deferred_eval_context),
             )?;
+        // https://www.gnu.org/software/make/manual/html_node/Secondary-Expansion.html
+        // this is supposed to be deferred but maybe i can get away with this
+        // TODO move this to run at runtime
+        #[cfg(feature = "full")]
+        let prerequisites = if self.targets.has(".SECONDEXPANSION") {
+            self.stack
+                .with_scope(&self.macros)
+                .with_scope(&LookupInternal::new_partial(&targets))
+                .expand(
+                    &prerequisites.parse()?,
+                    #[cfg(feature = "full")]
+                    Some(&mut deferred_eval_context),
+                )?
+        } else {
+            prerequisites
+        };
         #[cfg(feature = "full")]
         for child in deferred_eval_context {
             self.extend(child);
@@ -693,10 +709,7 @@ impl<'a, 'parent, R: BufRead> MakefileReader<'a, 'parent, R> {
                     }
                 }
             } else {
-                log::debug!(
-                    "pattern-based inference rule defined: {:?}",
-                    &new_rule,
-                );
+                log::debug!("pattern-based inference rule defined: {:?}", &new_rule,);
                 self.inference_rules.put(new_rule);
             }
             return Ok(());