From a560297ab88bdcb4b06599fa87e981e92a25d9c6 Mon Sep 17 00:00:00 2001
From: Joao Matos <joao@tritao.eu>
Date: Tue, 29 Aug 2017 20:26:58 +0100
Subject: [PATCH] [driver] Compilation platform is now nullable by default and
 validated to the host platforms.

---
 src/Core/Compilation.cs |  2 +-
 src/Core/Platform.cs    | 17 +++++++++++++++++
 src/Generator/Driver.cs |  3 +++
 3 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/src/Core/Compilation.cs b/src/Core/Compilation.cs
index a5f715a3..4b3dcf28 100644
--- a/src/Core/Compilation.cs
+++ b/src/Core/Compilation.cs
@@ -12,7 +12,7 @@ namespace CppSharp
         /// <summary>
         /// Target platform for code compilation.
         /// </summary>
-        public TargetPlatform Platform;
+        public TargetPlatform? Platform;
 
         /// <summary>
         /// Specifies the VS version.
diff --git a/src/Core/Platform.cs b/src/Core/Platform.cs
index e3bc75a2..093f19da 100644
--- a/src/Core/Platform.cs
+++ b/src/Core/Platform.cs
@@ -77,5 +77,22 @@ namespace CppSharp
                 return platform == PlatformID.Unix || platform == PlatformID.MacOSX;
             }
         }
+
+        public static TargetPlatform Host
+        {
+            get
+            {
+                if (IsWindows)
+                    return TargetPlatform.Windows;
+    
+                if (IsMacOS)
+                    return TargetPlatform.MacOS;
+    
+                if (IsLinux)
+                    return TargetPlatform.Linux;
+    
+                throw new NotImplementedException();
+            }
+        }
     }
 }
diff --git a/src/Generator/Driver.cs b/src/Generator/Driver.cs
index c538e939..0fe95a5a 100644
--- a/src/Generator/Driver.cs
+++ b/src/Generator/Driver.cs
@@ -48,6 +48,9 @@ namespace CppSharp
 
         void ValidateOptions()
         {
+            if (!Options.Compilation.Platform.HasValue)
+                Options.Compilation.Platform = Platform.Host;
+
             foreach (var module in Options.Modules)
             {
                 if (string.IsNullOrWhiteSpace(module.LibraryName))