From 0aa7a94e1032a96a2a72cb6a82824f9fe970d412 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 14 Dec 2022 14:18:44 +0200
Subject: Improve empty simple value to empty list of names reduction
 heuristics

Specifically, do not reduce typed RHS empty simple values for prepend/append
and additionally for assignment provided LHS is typed and is a container.
---
 libbuild2/variable.ixx | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

(limited to 'libbuild2/variable.ixx')

diff --git a/libbuild2/variable.ixx b/libbuild2/variable.ixx
index c9dfad4..c7b1f35 100644
--- a/libbuild2/variable.ixx
+++ b/libbuild2/variable.ixx
@@ -326,18 +326,21 @@ namespace build2
   }
 
   inline vector_view<const name>
-  reverse (const value& v, names& storage)
+  reverse (const value& v, names& storage, bool reduce)
   {
     assert (v &&
             storage.empty () &&
             (v.type == nullptr || v.type->reverse != nullptr));
-    return v.type == nullptr ? v.as<names> () : v.type->reverse (v, storage);
+
+    return v.type == nullptr
+      ? v.as<names> ()
+      : v.type->reverse (v, storage, reduce);
   }
 
   inline vector_view<name>
-  reverse (value& v, names& storage)
+  reverse (value& v, names& storage, bool reduce)
   {
-    names_view cv (reverse (static_cast<const value&> (v), storage));
+    names_view cv (reverse (static_cast<const value&> (v), storage, reduce));
     return vector_view<name> (const_cast<name*> (cv.data ()), cv.size ());
   }
 
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