From 9bc027848d84d8e5f06ab597aef01b399765cf42 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 2 Aug 2017 15:22:20 +0200
Subject: Indicate that source is preprocessed to modules

---
 libmformat/build/root.build       | 6 ++++++
 libmformat/tests/build/root.build | 3 +++
 2 files changed, 9 insertions(+)

diff --git a/libmformat/build/root.build b/libmformat/build/root.build
index 0f4a099..4286e66 100644
--- a/libmformat/build/root.build
+++ b/libmformat/build/root.build
@@ -2,6 +2,12 @@ cxx.std = experimental
 
 cxx.features.symexport = true
 
+# Indicate that our sources do not use #include and module imports do not
+# depend on the preprocessor.
+#
+if ($cxx.id.type != 'msvc') # Temporary for 'export module M;' fixup.
+  cxx.preprocessed = modules
+
 using cxx
 
 assert $cxx.features.modules 'c++ compiler does not support modules'
diff --git a/libmformat/tests/build/root.build b/libmformat/tests/build/root.build
index 58dffed..9e8c50d 100644
--- a/libmformat/tests/build/root.build
+++ b/libmformat/tests/build/root.build
@@ -1,5 +1,8 @@
 cxx.std = experimental
 
+if ($cxx.id.type != 'msvc') # Temporary for 'export module M;' fixup.
+  cxx.preprocessed = modules
+
 using cxx
 
 cxx{*}: extension = cxx
-- 
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