From 705b1bd47444a55736055fd5109df6184af16fea Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 4 Nov 2021 09:05:51 +0200
Subject: [PATCH] Detect and warn about wrong configuration file flavor

---
 libbuild2-autoconf/libbuild2/autoconf/rule.cxx | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/libbuild2-autoconf/libbuild2/autoconf/rule.cxx b/libbuild2-autoconf/libbuild2/autoconf/rule.cxx
index 6cf1231..2a969aa 100644
--- a/libbuild2-autoconf/libbuild2/autoconf/rule.cxx
+++ b/libbuild2-autoconf/libbuild2/autoconf/rule.cxx
@@ -237,6 +237,16 @@ namespace build2
               substitute_special (name);
               return;
             }
+            else if (s.compare (i, 11, "cmakedefine") == 0)
+            {
+              warn (l) << "#cmakedefine in autoconf configuration file" <<
+                info << "did you forget to specify autoconf.flavor=cmake?";
+            }
+            else if (s.compare (i, 11, "mesondefine") == 0)
+            {
+              warn (l) << "#mesondefine in autoconf configuration file" <<
+                info << "did you forget to specify autoconf.flavor=meson?";
+            }
           }
           break;
         }