From b2645ea919d159f7883c0d7001eaee528dddc371 Mon Sep 17 00:00:00 2001
From: Melody Horn <melody@boringcactus.com>
Date: Tue, 13 Apr 2021 21:08:51 -0600
Subject: don't clobber .SUFFIXES when an include finishes

---
 src/makefile/input.rs | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/src/makefile/input.rs b/src/makefile/input.rs
index 6860e80..e2bff65 100644
--- a/src/makefile/input.rs
+++ b/src/makefile/input.rs
@@ -166,6 +166,7 @@ pub struct MakefileReader<'a, 'parent, R: BufRead> {
     pub inference_rules: Vec<InferenceRule>,
     pub macros: MacroSet<'parent, 'static>,
     pub targets: HashMap<String, Target>,
+    built_in_targets: HashMap<String, Target>,
     pub first_non_special_target: Option<String>,
     pub failed_includes: Vec<String>,
     args: &'a Args,
@@ -221,6 +222,7 @@ impl<'a, 'parent, R: BufRead> MakefileReader<'a, 'parent, R> {
             inference_rules: Vec::new(),
             macros,
             targets: HashMap::new(),
+            built_in_targets: HashMap::new(),
             first_non_special_target: None,
             failed_includes: Vec::new(),
             args,
@@ -229,9 +231,9 @@ impl<'a, 'parent, R: BufRead> MakefileReader<'a, 'parent, R> {
             #[cfg(feature = "full")]
             conditional_stack: Vec::new(),
         };
-        // TODO be smart about this instead
+        // TODO be smart about this instead, please
         if !args.no_builtin_rules {
-            reader.targets.insert(
+            reader.built_in_targets.insert(
                 ".SUFFIXES".to_owned(),
                 Target {
                     name: ".SUFFIXES".into(),
@@ -528,7 +530,11 @@ impl<'a, 'parent, R: BufRead> MakefileReader<'a, 'parent, R> {
     }
 
     fn special_target_has_prereq(&self, target: &str, name: &str, empty_counts: bool) -> bool {
-        match self.targets.get(target) {
+        match self
+            .targets
+            .get(target)
+            .or_else(|| self.built_in_targets.get(target))
+        {
             Some(target) => {
                 (empty_counts && target.prerequisites.is_empty())
                     || target.prerequisites.iter().any(|e| e == name)
@@ -683,9 +689,14 @@ impl<'a, 'parent, R: BufRead> MakefileReader<'a, 'parent, R> {
                 Some(inference)
             } else {
                 log::info!(
-                    "looks like {:?} is not a suffix rule because .SUFFIXES is {:?}",
+                    "{}:{}: looks like {:?} is not a suffix rule because .SUFFIXES is {:?}",
+                    &self.file_name,
+                    line_number,
                     inference,
-                    self.targets.get(".SUFFIXES").map(|x| &x.prerequisites)
+                    self.targets
+                        .get(".SUFFIXES")
+                        .or_else(|| self.built_in_targets.get(".SUFFIXES"))
+                        .map(|x| &x.prerequisites)
                 );
                 None
             }
@@ -713,6 +724,7 @@ impl<'a, 'parent, R: BufRead> MakefileReader<'a, 'parent, R> {
                 if self.first_non_special_target.is_none() && !target.starts_with('.') {
                     self.first_non_special_target = Some(target.into());
                 }
+                // TODO handle appending to built-in (it's Complicated)
                 match self.targets.get_mut(target) {
                     Some(old_target)
                         if commands.is_empty()
-- 
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