From 297bc80eab5128e1cde7cd597368109a033b6cc0 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 28 Sep 2016 18:03:28 +0200
Subject: Update idea: C++ modules support

Add module test for Clang and VC
---
 build2/cxx-modules/modtest/buildfile | 63 ++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 build2/cxx-modules/modtest/buildfile

(limited to 'build2/cxx-modules/modtest/buildfile')

diff --git a/build2/cxx-modules/modtest/buildfile b/build2/cxx-modules/modtest/buildfile
new file mode 100644
index 0000000..4aa779b
--- /dev/null
+++ b/build2/cxx-modules/modtest/buildfile
@@ -0,0 +1,63 @@
+# file      : buildfile
+# copyright : Copyright (c) 2014-2016 Code Synthesis Ltd
+# license   : MIT; see accompanying LICENSE file
+
+./: exe{driver}
+
+lib{bar}: {hxx cxx}{bar}
+
+# The order of prerequisites is important. When compile with VC using modules
+# the module interface file (foo.ifc) should be produced before module consumer
+# (driver.cxx) is compiled. The same reasoning is applied for bar.ifc.
+#
+if ($cxx.id == "msvc")
+  exe{driver}: lib{bar} {hxx cxx}{foo} cxx{driver}
+else
+  exe{driver}: {hxx cxx}{foo} cxx{driver} lib{bar}
+
+cxx.poptions =+ -I$src_root
+
+if ($use_modules == true)
+{
+  cxx.poptions += -DMODTEST_USE_MODULES
+
+  if ($cxx.id == "clang")
+  {
+    # -Wno-ambiguous-macro - required to suppress "ambiguous expansion of macro
+    #                        MODTEST_MACRO" warning (do not mix up with macro
+    #                        redefinition warning). The warning seems to follow
+    #                        from a module macro leakage effect.
+    #
+    cxx.coptions += -fmodules -Wno-ambiguous-macro \
+      -fmodules-cache-path=$out_root/modcache
+
+    # Frankly not 100% sure this is required.
+    #
+    obj{foo}: cxx.coptions += -fmodule-name=foo
+    obj{bar}: cxx.coptions += -fmodule-name=bar
+  }
+  if ($cxx.id == "clang-apple")
+  {
+    # While compiler (8.0.0) recognizes -fmodules* options they just get
+    # ignored as no import module semantics is assigned to #include directive.
+    #
+    # @@ Can there be something wrong with module.modulemap file?
+    #
+    cxx.coptions += -fmodules -fmodules-cache-path=$out_root/modcache
+
+    obj{foo}: cxx.coptions += -fmodule-name=foo
+    obj{bar}: cxx.coptions += -fmodule-name=bar
+  }
+  elif ($cxx.id == "msvc")
+  {
+    # /module:interface - produce ifc-file if there is interface definition
+    #                     in a file.
+    # /module:search    - directory to search for ifc-files. In its absense
+    #                     need to use /module:reference <ifc-file> option when
+    #                     compile consumer of the module represented with the
+    #                     corresponding ifc-file.
+    #
+    cxx.coptions += /experimental:module /module:interface \
+                    /module:search $out_base
+  }
+}
-- 
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