Unity build: Add support for Visual Studio generator

It works as expected in Visual Studio.

Visual Studio 2017 will (partially) benefit from the build in
support for unity builds. The custom unity sources are used, because
the build in support doesn't allow batching of certain number of
files. It can do only batching by directory.

1 files changed, 6 insertions, 2 deletions

diff --git a/Source/cmLocalVisualStudio7Generator.cxx b/Source/cmLocalVisualStudio7Generator.cxx
index 795cee4..e9335c6 100644
--- a/Source/cmLocalVisualStudio7Generator.cxx
+++ b/Source/cmLocalVisualStudio7Generator.cxx
@@ -1320,6 +1320,7 @@ void cmLocalVisualStudio7Generator::WriteVCProjFile(std::ostream& fout,
                                                     const std::string& libName,
                                                     cmGeneratorTarget* target)
 {
+  this->AddUnityBuild(target, "");
   this->AddPchDependencies(target, "");
 
   std::vector<std::string> configs;
@@ -1508,8 +1509,11 @@ cmLocalVisualStudio7GeneratorFCInfo::cmLocalVisualStudio7GeneratorFCInfo(
     const std::string& linkLanguage = gt->GetLinkerLanguage(config.c_str());
     // If HEADER_FILE_ONLY is set, we must suppress this generation in
     // the project file
-    fc.ExcludedFromBuild =
-      sf.GetPropertyAsBool("HEADER_FILE_ONLY") || !cmContains(acs.Configs, ci);
+    fc.ExcludedFromBuild = sf.GetPropertyAsBool("HEADER_FILE_ONLY") ||
+      !cmContains(acs.Configs, ci) ||
+      (gt->GetPropertyAsBool("UNITY_BUILD") &&
+       sf.GetProperty("UNITY_SOURCE_FILE") &&
+       !sf.GetPropertyAsBool("SKIP_UNITY_BUILD_INCLUSION"));
     if (fc.ExcludedFromBuild) {
       needfc = true;
     }