From 9ae4897cfe935598333a5f709e967fefc4c161aa Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 31 May 2017 16:35:50 +0200
Subject: C++ modules work: add target types

---
 build2/cxx/init.cxx   | 11 ++++++++---
 build2/cxx/target.cxx | 13 +++++++++++++
 build2/cxx/target.hxx | 15 +++++++++++++++
 3 files changed, 36 insertions(+), 3 deletions(-)

(limited to 'build2/cxx')

diff --git a/build2/cxx/init.cxx b/build2/cxx/init.cxx
index fde12e3..a5422d2 100644
--- a/build2/cxx/init.cxx
+++ b/build2/cxx/init.cxx
@@ -375,19 +375,21 @@ namespace build2
     static const target_type* const hdr[] =
     {
       &hxx::static_type,
+      &h::static_type,
       &ixx::static_type,
       &txx::static_type,
-      &h::static_type,
+      &mxx::static_type,
       nullptr
     };
 
     static const target_type* const inc[] =
     {
       &hxx::static_type,
+      &h::static_type,
       &ixx::static_type,
       &txx::static_type,
+      &mxx::static_type,
       &cxx::static_type,
-      &h::static_type,
       &c::static_type,
       nullptr
     };
@@ -414,6 +416,8 @@ namespace build2
       if (!cast_false<bool> (rs["cxx.config.loaded"]))
         load_module (rs, rs, "cxx.config", loc, false, hints);
 
+      bool modules (cast<bool> (rs["cxx.features.modules"]));
+
       config_module& cm (*rs.modules.lookup<config_module> ("cxx.config"));
 
       cc::data d {
@@ -433,13 +437,14 @@ namespace build2
 
         cm.tstd,
 
-        cast<bool> (rs["cxx.features.modules"]),
+        modules,
 
         cast_null<process_path> (rs["pkgconfig.path"]),
         cast<dir_paths> (rs[cm.x_sys_lib_dirs]),
         cast<dir_paths> (rs[cm.x_sys_inc_dirs]),
 
         cxx::static_type,
+        modules ? &mxx::static_type : nullptr,
         hdr,
         inc
       };
diff --git a/build2/cxx/target.cxx b/build2/cxx/target.cxx
index 7fb9971..5641e7a 100644
--- a/build2/cxx/target.cxx
+++ b/build2/cxx/target.cxx
@@ -63,5 +63,18 @@ namespace build2
       &file_search,
       false
     };
+
+    extern const char mxx_ext_def[] = "mxx";
+    const target_type mxx::static_type
+    {
+      "mxx",
+      &cc::static_type,
+      &target_factory<mxx>,
+      &target_extension_var<ext_var, mxx_ext_def>,
+      &target_pattern_var<ext_var, mxx_ext_def>,
+      nullptr,
+      &file_search,
+      false
+    };
   }
 }
diff --git a/build2/cxx/target.hxx b/build2/cxx/target.hxx
index 4dd93e3..f5591d1 100644
--- a/build2/cxx/target.hxx
+++ b/build2/cxx/target.hxx
@@ -57,6 +57,21 @@ namespace build2
       static const target_type static_type;
       virtual const target_type& dynamic_type () const {return static_type;}
     };
+
+    // The module interface unit is both like a header (e.g., we need to
+    // install it) and like a source (we need to compile it). Plus, to
+    // support dual use (modules/headers) it could actually be #include'd
+    // (and in both cases).
+    //
+    class mxx: public cc::cc
+    {
+    public:
+      using cc::cc;
+
+    public:
+      static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
+    };
   }
 }
 
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