From 743273bd381a132c272226af00381da0494e8920 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 15 Feb 2022 15:59:22 +0200
Subject: Diagnose various misuses of library metadata protocol

---
 libbuild2/cc/common.cxx | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'libbuild2/cc/common.cxx')

diff --git a/libbuild2/cc/common.cxx b/libbuild2/cc/common.cxx
index 09a1752..ccb678c 100644
--- a/libbuild2/cc/common.cxx
+++ b/libbuild2/cc/common.cxx
@@ -320,6 +320,10 @@ namespace build2
             if (pt.adhoc || pt == nullptr)
               continue;
 
+            if (marked (pt))
+              fail << "implicit dependency cycle detected involving library "
+                   << l;
+
             bool la;
             const file* f;
 
-- 
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