From 4c51fd7062a7e1c34deed9a7e9f1e87239a2e38c Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 11 Jun 2020 13:55:34 +0200
Subject: Diagnose use of ad hoc C++ recipes with bootstrap build system

---
 libbuild2/parser.cxx | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/libbuild2/parser.cxx b/libbuild2/parser.cxx
index 21b5794..c2decd3 100644
--- a/libbuild2/parser.cxx
+++ b/libbuild2/parser.cxx
@@ -1143,7 +1143,10 @@ namespace build2
             {
               // C++
               //
-
+#ifdef BUILD2_BOOTSTRAP
+              fail (loc) << "ad hoc c++ recipe" <<
+                info << "running bootstrap build system";
+#else
               // Parse recipe version and optional fragment separator.
               //
               if (tt == type::newline || tt == type::eos)
@@ -1188,6 +1191,7 @@ namespace build2
 
               ar.reset (
                 new adhoc_cxx_rule (loc, st.value.size (), ver, move (sep)));
+#endif
             }
             else
               fail (lloc) << "unknown recipe language '" << *lang << "'";
-- 
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