From dd05354924c71c1074a589db9b7475e81f212d39 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Fri, 14 Jun 2024 12:17:02 +0200
Subject: Instrument header cache inconsistency assert with additional info (GH
 issue #390)

---
 libbuild2/cc/compile-rule.cxx | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/libbuild2/cc/compile-rule.cxx b/libbuild2/cc/compile-rule.cxx
index 7629ed5..95ba89f 100644
--- a/libbuild2/cc/compile-rule.cxx
+++ b/libbuild2/cc/compile-rule.cxx
@@ -3213,7 +3213,21 @@ namespace build2
         if (f != nullptr)
         {
           //cache_cls.fetch_add (1, memory_order_relaxed);
+
+#if 0
           assert (r.first == f);
+#else
+          if (r.first != f)
+          {
+            info   << "inconsistent header cache content" <<
+              info << "encountered: " << *f <<
+              info << "expected: " << *r.first <<
+              info << "please report at "
+                   << "https://github.com/build2/build2/issues/390";
+
+            assert (r.first == f);
+          }
+#endif
         }
       }
 
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