From ab93dccd5806de95b9123ec6c2272847ca0ae592 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Fri, 24 Apr 2020 10:32:21 +0200
Subject: Add inject() for injecting additional dependencies during match

---
 libbuild2/algorithm.hxx | 7 +++++++
 libbuild2/algorithm.ixx | 7 +++++++
 2 files changed, 14 insertions(+)

diff --git a/libbuild2/algorithm.hxx b/libbuild2/algorithm.hxx
index d15810c..28b76c4 100644
--- a/libbuild2/algorithm.hxx
+++ b/libbuild2/algorithm.hxx
@@ -423,6 +423,13 @@ namespace build2
   const target*
   resolve_group (action, const target&);
 
+  // Inject a target as a "prerequisite target" (note: not a prerequisite) of
+  // another target. Specifically, first match the prerequisite target and
+  // then add it to the back of the dependent target's prerequisite_targets.
+  //
+  void
+  inject (action, target&, const target& prereq);
+
   // Inject dependency on the target's directory fsdir{}, unless it is in the
   // src tree or is outside of any project (say, for example, an installation
   // directory). If the parent argument is true, then inject the parent
diff --git a/libbuild2/algorithm.ixx b/libbuild2/algorithm.ixx
index 9c656fd..c421218 100644
--- a/libbuild2/algorithm.ixx
+++ b/libbuild2/algorithm.ixx
@@ -476,6 +476,13 @@ namespace build2
     return t.group;
   }
 
+  inline void
+  inject (action a, target& t, const target& p)
+  {
+    match (a, p);
+    t.prerequisite_targets[a].emplace_back (&p);
+  }
+
   LIBBUILD2_SYMEXPORT void
   match_prerequisites (action, target&, const match_search&, const scope*);
 
-- 
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