From 7459ac30aa69d6fc5a0e0d2a0050b475e7af85d6 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 22 Feb 2024 10:16:17 +0200
Subject: Detect dependency cycles in *.export.libs

Fixes GH issue #362.
---
 libbuild2/cc/common.cxx | 5 +++++
 1 file changed, 5 insertions(+)

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

diff --git a/libbuild2/cc/common.cxx b/libbuild2/cc/common.cxx
index 44722c4..2a8bc50 100644
--- a/libbuild2/cc/common.cxx
+++ b/libbuild2/cc/common.cxx
@@ -162,7 +162,12 @@ namespace build2
       // Add the library to the chain.
       //
       if (self && proc_lib)
+      {
+        if (find (chain->begin (), chain->end (), &l) != chain->end ())
+          fail << "dependency cycle detected involving library " << l;
+
         chain->push_back (&l);
+      }
 
       // We only lookup public variables so go straight for the public
       // variable pool.
-- 
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