From 6d61a95027c0e199495f083b393d740933f41e82 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Mon, 11 Apr 2016 16:20:37 +0200
Subject: Separate config variable for different modules with blanks

---
 build2/config/operation.cxx | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/build2/config/operation.cxx b/build2/config/operation.cxx
index fc583b5..ec92e89 100644
--- a/build2/config/operation.cxx
+++ b/build2/config/operation.cxx
@@ -94,6 +94,35 @@ namespace build2
               << "#" << endl;
         }
 
+        // Separate variables for modules with blank lines.
+        //
+        const string* mod_s (nullptr);
+        size_t mod_n (0);
+
+        auto next_module = [&mod_s, &mod_n] (const variable& var) -> bool
+        {
+          const string& s (var.name);
+
+          size_t p (s.find ('.', 7)); // 7 for "config."
+          size_t n (p != string::npos ? p - 7 : s.size () - 7);
+
+          if (mod_s == nullptr)
+          {
+            mod_s = &s;
+            mod_n = n;
+            return false; // First
+          }
+
+          if (s.compare (7, n, *mod_s, 7, mod_n) != 0)
+          {
+            mod_s = &s;
+            mod_n = n;
+            return true; // Next.
+          }
+
+          return false;
+        };
+
         // Save config variables.
         //
         names storage;
@@ -195,6 +224,9 @@ namespace build2
               continue;
           }
 
+          if (next_module (var))
+            ofs << endl;
+
           if (val)
           {
             storage.clear ();
-- 
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