Redo fallback reverse operation machinery in ad hoc recipes

1 files changed, 14 insertions, 0 deletions

diff --git a/libbuild2/target.hxx b/libbuild2/target.hxx
index 56b10c0..45f285c 100644
--- a/libbuild2/target.hxx
+++ b/libbuild2/target.hxx
@@ -97,6 +97,16 @@ namespace build2
   //
   using rule_match = pair<const string, reference_wrapper<const rule>>;
 
+  // Additional information about a rule match (see rule.hxx for details).
+  //
+  // @@ TODO: will probably want to clear it after apply() if add anything
+  //    dynamically-allocated here (see apply_impl()).
+  //
+  struct match_extra
+  {
+    bool fallback; // True if matching a fallback rule.
+  };
+
   // Target.
   //
 
@@ -495,6 +505,10 @@ namespace build2
       //
       mutable atomic_count dependents {0};
 
+      // Match state storage between the match() and apply() calls.
+      //
+      build2::match_extra match_extra;
+
       // Matched rule (pointer to hint_rule_map element). Note that in case of
       // a direct recipe assignment we may not have a rule (NULL).
       //