From fc94d68a0389e3e9fc4f143e519f527e1770aa8f Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 19 Jul 2017 17:59:44 +0200
Subject: Make distributable with any compiler

---
 build/root.build |  2 +-
 buildfile        | 82 +++++++++++++++++++++++++++++++++-----------------------
 tests/buildfile  | 16 ++++++++---
 3 files changed, 63 insertions(+), 37 deletions(-)

diff --git a/build/root.build b/build/root.build
index 7b4a007..cfbcda9 100644
--- a/build/root.build
+++ b/build/root.build
@@ -6,7 +6,7 @@ cxx.std = experimental
 
 using cxx
 
-assert $cxx.features.modules 'c++ compiler does not support modules'
+#assert $cxx.features.modules 'c++ compiler does not support modules'
 
 mxx{*}: extension = mxx
 cxx{*}: extension = cxx
diff --git a/buildfile b/buildfile
index 0efdd29..26bd1b8 100644
--- a/buildfile
+++ b/buildfile
@@ -17,49 +17,65 @@ doc{version}: dist = true
 dir{tests/}:     install = false
 doc{INSTALL}@./: install = false
 
-# Building of the modules gets rather compiler-specific.
-#
-if ($cxx.id.type == 'clang')
+if! $cxx.features.modules
 {
-  # Use the naming scheme expected by -fprebuilt-module-path=. Can also be
-  # specified with -fmodule-file=.
+  # List sources as files so that we can prepare a distribution with any
+  # compiler.
   #
-  core = std.core.pcm
-  io   = std.io.pcm
+  ./: {mxx cxx}{*}
 }
-elif ($cxx.id.type == 'msvc')
+else
 {
-  # Use the naming scheme expected by /module:stdIfcDir. Note that IFCPATH
-  # would require an extra directory (x64 or x86; e.g., x64/Release/).
+  # We only do the static library since this is what we would have gotten
+  # should we have used headers (i.e., whatever object code generated from
+  # those headers would have ended up in each executable/library).
   #
-  # @@ Currently VC looks in Release regardless of /MD or /MDd.
+  ./: liba{std-modules}
+
+  # Building of the modules gets rather compiler-specific.
   #
-  dir  = release/
-  core = $dir/std.core.ifc
-  io   = $dir/std.io.ifc
+  if ($cxx.id.type == 'clang')
+  {
+    # Use the naming scheme expected by -fprebuilt-module-path=. Can also be
+    # specified with -fmodule-file=.
+    #
+    core = std.core.pcm
+    io   = std.io.pcm
+  }
+  elif ($cxx.id.type == 'msvc')
+  {
+    # Use the naming scheme expected by /module:stdIfcDir. Note that IFCPATH
+    # would require an extra directory (x64 or x86; e.g., x64/Release/).
+    #
+    # @@ Currently VC looks in Release regardless of /MD or /MDd.
+    #
+    dir  = release/
+    core = $dir/std.core.ifc
+    io   = $dir/std.io.ifc
 
-  bmia{$core $io}: fsdir{$dir}
+    bmia{$core $io}: fsdir{$dir}
 
-  # VC expects to find std.lib next to the .ifc's. Make it a dummy one.
-  #
-  liba{std-modules}: $dir/liba{std}
-  $dir/liba{std}: cxx{dummy.cxx}
-}
+    # VC expects to find std.lib next to the .ifc's. Make it a dummy one.
+    #
+    liba{std-modules}: $dir/liba{std}
+    $dir/liba{std}: cxx{dummy.cxx}
+  }
 
-# @@ TMP: use utility library instead?
-#
-if ($cxx.target.class == 'linux' || $cxx.target.class == 'bsd')
-  cxx.coptions += -fPIC
+  # @@ TMP: use utility library instead?
+  #
+  if ($cxx.target.class == 'linux' || $cxx.target.class == 'bsd')
+    cxx.coptions += -fPIC
 
-# Clang 5.0 with libc++ (sometimes) needs it -- go figure.
-#
-if ($cxx.target.class != "windows")
-  cxx.libs += -lpthread
+  # Clang 5.0 with libc++ (sometimes) needs it -- go figure.
+  #
+  if ($cxx.target.class != "windows")
+    cxx.libs += -lpthread
 
-liba{std-modules}: bmia{$core $io}
+  liba{std-modules}: bmia{$core $io}
 
-bmia{$core}: mxx{std-core}
-bmia{$io}:   mxx{std-io} bmia{$core}
+  bmia{$core}: mxx{std-core}
+  bmia{$io}:   mxx{std-io} bmia{$core}
 
-mxx{std-core}@./: cc.module_name = std.core
-mxx{std-io}@./:   cc.module_name = std.io
+  mxx{std-core}@./: cc.module_name = std.core
+  mxx{std-io}@./:   cc.module_name = std.io
+}
diff --git a/tests/buildfile b/tests/buildfile
index 881153e..8941a94 100644
--- a/tests/buildfile
+++ b/tests/buildfile
@@ -2,7 +2,17 @@
 # copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
 # license   : MIT; see accompanying LICENSE file
 
-import libs = libstd-modules%liba{std-modules}
+if! $cxx.features.modules
+{
+  # List sources as files so that we can prepare a distribution with any
+  # compiler.
+  #
+  ./: cxx{*} file{test.out}
+}
+else
+{
+  import libs = libstd-modules%liba{std-modules}
 
-exe{driver}: cxx{driver} $libs
-exe{driver}: test.output = test.out
+  exe{driver}: cxx{driver} $libs
+  exe{driver}: test.output = test.out
+}
-- 
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