From 2a9607c1648a39210012139e62e07fce790badde Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Mon, 11 Dec 2023 11:00:00 +0200
Subject: Instrument target::newer() with additional debug information

---
 libbuild2/target.ixx | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/libbuild2/target.ixx b/libbuild2/target.ixx
index 39b81e7..2e1c65e 100644
--- a/libbuild2/target.ixx
+++ b/libbuild2/target.ixx
@@ -769,7 +769,19 @@ namespace build2
   inline bool mtime_target::
   newer (timestamp mt, target_state s) const
   {
+#ifndef NDEBUG
+    // @@ TMP
+    //
+    if (s == target_state::unknown)
+    {
+      text << "unknown target_state in newer(): " << *this <<
+        info << "phase: " << ctx.phase;
+
+      terminate (true /* trace */);
+    }
+
     assert (s != target_state::unknown); // Should be executed.
+#endif
 
     timestamp mp (mtime ());
 
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