From eacf7f7ccd40a56d1fe761d3d30ced6c6acd58da Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 1 Nov 2018 13:00:16 +0200
Subject: Add support for rule-specific variables, use to fix cc.type data race

---
 build2/target.cxx | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

(limited to 'build2/target.cxx')

diff --git a/build2/target.cxx b/build2/target.cxx
index 5d11337..20b9fd6 100644
--- a/build2/target.cxx
+++ b/build2/target.cxx
@@ -192,6 +192,31 @@ namespace build2
     return r;
   }
 
+  pair<lookup, size_t> target::opstate::
+  find_original (const variable& var, bool target_only) const
+  {
+    pair<lookup, size_t> r (lookup (), 0);
+
+    ++r.second;
+    {
+      auto p (vars.find (var));
+      if (p.first != nullptr)
+        r.first = lookup (*p.first, p.second, vars);
+    }
+
+    // Delegate to target's find_original().
+    //
+    if (!r.first)
+    {
+      auto p (target_->find_original (var, target_only));
+
+      r.first = move (p.first);
+      r.second = r.first ? r.second + p.second : p.second;
+    }
+
+    return r;
+  }
+
   optional<string> target::
   split_name (string& v, const location& loc)
   {
@@ -366,6 +391,8 @@ namespace build2
       {
         t->ext_ = &i->first.ext;
         t->implied = implied;
+        t->state.data[0].target_ = t;
+        t->state.data[1].target_ = t;
         return pair<target&, ulock> (*t, move (ul));
       }
 
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