From f9d759160eef1ca870edcbb9b87caa23f0c93a43 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Sun, 17 Dec 2017 10:27:36 +0200
Subject: Diagnose C++ source/output target type mismatch (mxx{} vs cxx{})

---
 build2/cc/compile.cxx | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

(limited to 'build2/cc/compile.cxx')

diff --git a/build2/cc/compile.cxx b/build2/cc/compile.cxx
index 3b60a5b..9de037e 100644
--- a/build2/cc/compile.cxx
+++ b/build2/cc/compile.cxx
@@ -918,6 +918,28 @@ namespace build2
             break;
           }
 
+          // Make sure the translation unit type matches the resulting target
+          // type.
+          //
+          switch (tu.type ())
+          {
+          case translation_type::plain:
+          case translation_type::module_impl:
+            {
+              if (mod)
+                fail << "translation unit " << src << " is not a module interface" <<
+                  info << "consider using " << x_src.name << "{} instead";
+              break;
+            }
+          case translation_type::module_iface:
+            {
+              if (!mod)
+                fail << "translation unit " << src << " is a module interface" <<
+                  info << "consider using " << x_mod->name << "{} instead";
+              break;
+            }
+          }
+
           md.type = tu.type ();
 
           // Extract the module dependency information in addition to header
-- 
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