Add preprocessor variables with WiX version info.

$(sys.WIXMAJORVERSION)
$(sys.WIXVERSION)

3 files changed, 41 insertions, 2 deletions

diff --git a/src/WixToolset.Core/ExtensibilityServices/PreprocessHelper.cs b/src/WixToolset.Core/ExtensibilityServices/PreprocessHelper.cs
index dfee0046..60726a02 100644
--- a/src/WixToolset.Core/ExtensibilityServices/PreprocessHelper.cs
+++ b/src/WixToolset.Core/ExtensibilityServices/PreprocessHelper.cs
@@ -248,6 +248,12 @@ namespace WixToolset.Core.ExtensibilityServices
                                     throw new ArgumentException("Unknown platform enumeration '{0}' encountered.", context.Platform.ToString());
                             }
 
+                        case "WIXMAJORVERSION":
+                            return ThisAssembly.AssemblyFileVersion.Split('.')[0];
+
+                        case "WIXVERSION":
+                            return ThisAssembly.AssemblyFileVersion;
+
                         default:
                             return null;
                     }
diff --git a/src/test/WixToolsetTest.CoreIntegration/PreprocessorFixture.cs b/src/test/WixToolsetTest.CoreIntegration/PreprocessorFixture.cs
index 633a1b46..4e48cbe1 100644
--- a/src/test/WixToolsetTest.CoreIntegration/PreprocessorFixture.cs
+++ b/src/test/WixToolsetTest.CoreIntegration/PreprocessorFixture.cs
@@ -7,6 +7,7 @@ namespace WixToolsetTest.CoreIntegration
     using WixBuildTools.TestSupport;
     using WixToolset.Core;
     using WixToolset.Core.TestPackage;
+    using WixToolset.Data;
     using WixToolset.Extensibility.Data;
     using Xunit;
 
@@ -61,8 +62,36 @@ namespace WixToolsetTest.CoreIntegration
 
                 result.AssertSuccess();
 
-                var warnings = result.Messages.Where(message => message.Id == 1118);
-                Assert.Single(warnings);
+                var warning = result.Messages.Where(message => message.Id == (int)WarningMessages.Ids.VariableDeclarationCollision);
+                Assert.Single(warning);
+            }
+        }
+
+        [Fact]
+        public void WixVersionVariablesWork()
+        {
+            var folder = TestData.Get(@"TestData\Variables");
+
+            using (var fs = new DisposableFileSystem())
+            {
+                var baseFolder = fs.GetFolder();
+                var intermediateFolder = Path.Combine(baseFolder, "obj");
+
+                var result = WixRunner.Execute(new[]
+                {
+                    "build",
+                    Path.Combine(folder, "Package.wxs"),
+                    Path.Combine(folder, "PackageComponents.wxs"),
+                    "-loc", Path.Combine(folder, "Package.en-us.wxl"),
+                    "-bindpath", Path.Combine(folder, "data"),
+                    "-intermediateFolder", intermediateFolder,
+                    "-o", Path.Combine(baseFolder, @"bin\test.msi")
+                });
+
+                result.AssertSuccess();
+
+                var warning = result.Messages.Where(message => message.Id == (int)WarningMessages.Ids.PreprocessorWarning);
+                Assert.Single(warning);
             }
         }
 
diff --git a/src/test/WixToolsetTest.CoreIntegration/TestData/Variables/Package.wxs b/src/test/WixToolsetTest.CoreIntegration/TestData/Variables/Package.wxs
index 896b7e3f..9f5e3f34 100644
--- a/src/test/WixToolsetTest.CoreIntegration/TestData/Variables/Package.wxs
+++ b/src/test/WixToolsetTest.CoreIntegration/TestData/Variables/Package.wxs
@@ -6,6 +6,10 @@
 <?define Bar = "Bar" ?>
 <?define Bar = "Baz" ?>
 
+<?if $(sys.WIXMAJORVERSION) >= 4 AND $(sys.WIXMAJORVERSION) < 5 ?>
+  <?warning WiX v4 is in effect! ?>
+<?endif?>
+
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
   <Product Id="*" Name="MsiPackage" Language="1033" Version="1.0.0.0" Manufacturer="Example Corporation" UpgradeCode="047730a5-30fe-4a62-a520-da9381b8226a">
     <Package InstallerVersion="200" Compressed="no" InstallScope="perMachine" />