Fix #44: Debian 0.2.1 release on Fedora Rawhide

Make the input file optional. This allows access to Clang flags which
don't take any arguments.

build.sh

@@ -2,7 +2,7 @@
 
 if [ -s "$HOME/.dvm/scripts/dvm" ] ; then
     . "$HOME/.dvm/scripts/dvm" ;
-    dvm use 2.066.1
+    dvm use 2.069.2
 fi
 
 dub build

dstep/driver/Application.d

@@ -49,8 +49,15 @@ class Application : DStack.Application
     protected override void run ()
     {
         handleArguments;
-        inputFiles ~= arguments.argument.input;
-        startConversion(inputFiles.first);
+
+        if (arguments.argument.input.hasValue)
+        {
+            inputFiles ~= arguments.argument.input;
+            startConversion(inputFiles.first);
+        }
+
+        else
+            startConversion("");
     }
 
     protected override void setupArguments ()
@@ -88,15 +95,16 @@ private:
         translationUnit = TranslationUnit.parse(index, file, compilerArgs,
             compiler.extraHeaders);
 
-        if (!translationUnit.isValid)
-            throw new DStepException("An unknown error occurred");
+        // hope that the diagnostics below handle everything
+        // if (!translationUnit.isValid)
+        //     throw new DStepException("An unknown error occurred");
 
         diagnostics = translationUnit.diagnostics;
 
         scope (exit)
             clean;
 
-        if (handleDiagnostics)
+        if (handleDiagnostics && file.any)
         {
             Translator.Options options;
             options.outputFile = arguments.output;

dub.json

@@ -33,6 +33,6 @@
     ],
 
     "dependencies": {
-        "dstack": "0.0.4"
+        "dstack": "~>0.0.5"
     }
 }

dub.selections.json

@@ -1,8 +1,8 @@
 {
 	"fileVersion": 1,
 	"versions": {
-		"dstack": "0.0.4",
-		"mambo": "0.0.6",
+		"dstack": "0.0.5",
+		"mambo": "0.0.7",
 		"tango": "1.0.3+2.068"
 	}
 }