From a2fe645fd79cae0781955b244932e89c16ceb71c Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 11 Jul 2018 09:13:45 +0200
Subject: Force reprocessing for module interface units if compiling with VC

---
 build2/cc/compile-rule.cxx | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'build2/cc')

diff --git a/build2/cc/compile-rule.cxx b/build2/cc/compile-rule.cxx
index 61d5984..a41203b 100644
--- a/build2/cc/compile-rule.cxx
+++ b/build2/cc/compile-rule.cxx
@@ -973,6 +973,16 @@ namespace build2
           //       t.prerequisite_targets!
           //
           extract_modules (a, bs, t, li, tt, src, md, move (tu.mod), dd, u);
+
+          // Currently in VC module interface units must be compiled from the
+          // original source (something to do with having to detect and store
+          // header boundaries in the .ifc files).
+          //
+          if (cid == compiler_id::msvc)
+          {
+            if (md.type == translation_type::module_iface)
+              psrc.second = false;
+          }
         }
 
         // If anything got updated, then we didn't rely on the cache. However,
-- 
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