Preparation for building on linux

build.cake

@@ -109,7 +109,7 @@ Task ("libs")
         CopyFileToDirectory ("./source/SkiaSharp.Svg/SkiaSharp.Svg/bin/Release/SkiaSharp.Svg.dll", "./output/portable/");
     }
 
-    if (IsRunningOnUnix ()) {
+    if (IsRunningOnMac ()) {
         // build
         RunNuGetRestore ("binding/SkiaSharp.Mac.sln");
         DotNetBuild ("binding/SkiaSharp.Mac.sln", c => { 
@@ -145,6 +145,9 @@ Task ("libs")
         // copy SVG
         CopyFileToDirectory ("./source/SkiaSharp.Svg/SkiaSharp.Svg/bin/Release/SkiaSharp.Svg.dll", "./output/portable/");
     }
+
+    if (IsRunningOnLinux ()) {
+    }
 });
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -171,7 +174,7 @@ Task ("tests")
         RunTests("./tests/SkiaSharp.Desktop.Tests/bin/x64/Release/SkiaSharp.Desktop.Tests.dll");
     }
     // Mac OSX (Any CPU)
-    if (IsRunningOnUnix ()) {
+    if (IsRunningOnMac () || IsRunningOnLinux ()) {
         DotNetBuild ("./tests/SkiaSharp.Desktop.Tests/SkiaSharp.Desktop.Tests.sln", c => { 
             c.Configuration = "Release"; 
         });
@@ -195,7 +198,11 @@ Task ("samples")
         Zip ("./samples", "./output/samples.zip");
     }
 
-    if (IsRunningOnUnix ()) {
+    if (IsRunningOnLinux ()) {
+
+    }
+
+    if (IsRunningOnMac ()) {
         RunNuGetRestore ("./samples/MacSample/MacSample.sln");
         DotNetBuild ("./samples/MacSample/MacSample.sln", c => { 
             c.Configuration = "Release"; 
@@ -317,7 +324,7 @@ Task ("update-docs")
         });
     }
     // add mac-specific references
-    if (IsRunningOnUnix ()) {
+    if (IsRunningOnMac ()) {
         refs = refs.Union (new DirectoryPath [] {
             "/Library/Frameworks/Mono.framework/Versions/Current/lib/mono/xbuild-frameworks/.NETPortable/v4.5",
             "/Library/Frameworks/Xamarin.Android.framework/Versions/Current/lib/xbuild-frameworks/MonoAndroid/v1.0",
@@ -346,7 +353,7 @@ Task ("update-docs")
         }).ToArray ();
     }
     // add mac-specific assemblies
-    if (IsRunningOnUnix ()) {
+    if (IsRunningOnMac ()) {
         assemblies = assemblies.Union (new FilePath [] {
             "./output/android/SkiaSharp.Views.Android.dll",
             "./output/ios/SkiaSharp.Views.iOS.dll",
@@ -420,11 +427,14 @@ Task ("nuget")
             PackageNuGet ("./nuget/SkiaSharp.Views.Windows.nuspec", "./output/");
             PackageNuGet ("./nuget/SkiaSharp.Views.Forms.Windows.nuspec", "./output/");
         }
-        if (IsRunningOnUnix ()) {
+        if (IsRunningOnMac ()) {
             PackageNuGet ("./nuget/SkiaSharp.Mac.nuspec", "./output/");
             PackageNuGet ("./nuget/SkiaSharp.Views.Mac.nuspec", "./output/");
             PackageNuGet ("./nuget/SkiaSharp.Views.Forms.Mac.nuspec", "./output/");
         }
+        if (IsRunningOnLinux ()) {
+            
+        }
     }
     // SVG is a PCL
     PackageNuGet ("./nuget/SkiaSharp.Svg.nuspec", "./output/");

cake/BuildExternals.cake

@@ -130,12 +130,14 @@ Task ("externals-native")
         CopyFileToDirectory (ANGLE_PATH.CombineWithFilePath ("uwp/bin/UAP/x64/libEGL.dll"), "./output/uwp/x64/");
         CopyFileToDirectory (ANGLE_PATH.CombineWithFilePath ("uwp/bin/UAP/x64/libGLESv2.dll"), "./output/uwp/x64/");
     }
-    if (IsRunningOnUnix ()) {
+    if (IsRunningOnMac ()) {
         if (!DirectoryExists ("./output/osx")) CreateDirectory ("./output/osx");
         if (!DirectoryExists ("./output/mac")) CreateDirectory ("./output/mac");
         CopyFileToDirectory ("./native-builds/lib/osx/libSkiaSharp.dylib", "./output/osx/");
         CopyFileToDirectory ("./native-builds/lib/osx/libSkiaSharp.dylib", "./output/mac/");
     }
+    if (IsRunningOnLinux ()) {
+    }
 });
 
 // this builds the native C and C++ externals for Windows
@@ -215,7 +217,7 @@ Task ("externals-uwp")
 
 // this builds the native C and C++ externals for Mac OS X
 Task ("externals-osx")
-    .WithCriteria (IsRunningOnUnix ())
+    .WithCriteria (IsRunningOnMac ())
     .WithCriteria (
         !FileExists ("native-builds/lib/osx/libSkiaSharp.dylib"))
     .Does (() =>  
@@ -252,7 +254,7 @@ Task ("externals-osx")
 
 // this builds the native C and C++ externals for iOS
 Task ("externals-ios")
-    .WithCriteria (IsRunningOnUnix ())
+    .WithCriteria (IsRunningOnMac ())
     .WithCriteria (
         !FileExists ("native-builds/lib/ios/libSkiaSharp.framework/libSkiaSharp"))
     .Does (() => 
@@ -296,7 +298,7 @@ Task ("externals-ios")
 
 // this builds the native C and C++ externals for tvOS
 Task ("externals-tvos")
-    .WithCriteria (IsRunningOnUnix ())
+    .WithCriteria (IsRunningOnMac ())
     .WithCriteria (
         !FileExists ("native-builds/lib/tvos/libSkiaSharp.framework/libSkiaSharp"))
     .Does (() => 
@@ -335,7 +337,7 @@ Task ("externals-tvos")
 
 // this builds the native C and C++ externals for Android
 Task ("externals-android")
-    .WithCriteria (IsRunningOnUnix ())
+    .WithCriteria (IsRunningOnMac ())
     .WithCriteria (
         !FileExists ("native-builds/lib/android/x86/libSkiaSharp.so") ||
         !FileExists ("native-builds/lib/android/x86_64/libSkiaSharp.so") ||

cake/UtilsManaged.cake

@@ -81,3 +81,11 @@ var ClearSkiaSharpNuGetCache = new Action (() => {
         CleanDirectory (installedNuGet);
     }
 });
+
+var IsRunningOnMac = new Func<bool> (() => {
+    return System.Environment.OSVersion.Platform == PlatformID.MacOSX;
+});
+
+var IsRunningOnLinux = new Func<bool> (() => {
+    return IsRunningOnUnix () && !IsRunningOnMac ();
+});

cake/UtilsNative.cake

@@ -19,7 +19,7 @@ var RunGyp = new Action<string, string> ((defines, generators) =>
 
 var RunInstallNameTool = new Action<DirectoryPath, string, string, FilePath> ((directory, oldName, newName, library) =>
 {
-    if (!IsRunningOnUnix ()) {
+    if (!IsRunningOnMac ()) {
         throw new InvalidOperationException ("install_name_tool is only available on Unix.");
     }
     
@@ -31,7 +31,7 @@ var RunInstallNameTool = new Action<DirectoryPath, string, string, FilePath> ((d
 
 var RunLipo = new Action<DirectoryPath, FilePath, FilePath[]> ((directory, output, inputs) =>
 {
-    if (!IsRunningOnUnix ()) {
+    if (!IsRunningOnMac ()) {
         throw new InvalidOperationException ("lipo is only available on Unix.");
     }