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.

3 files changed, 65 insertions, 3 deletions

diff --git a/Source/cmLocalGenerator.cxx b/Source/cmLocalGenerator.cxx
index 6fade3e..6249c28 100644
--- a/Source/cmLocalGenerator.cxx
+++ b/Source/cmLocalGenerator.cxx
@@ -2266,7 +2266,10 @@ void cmLocalGenerator::AddUnityBuild(cmGeneratorTarget* target,
         for (; begin != end; ++begin) {
           cmSourceFile* sf = filtered_sources[begin];
 
-          sf->SetProperty("HEADER_FILE_ONLY", "ON");
+          if (!this->GetGlobalGenerator()->IsMultiConfig()) {
+            sf->SetProperty("HEADER_FILE_ONLY", "ON");
+          }
+          sf->SetProperty("UNITY_SOURCE_FILE", filename.c_str());
 
           if (beforeInclude) {
             file << beforeInclude << "\n";
@@ -2283,6 +2286,10 @@ void cmLocalGenerator::AddUnityBuild(cmGeneratorTarget* target,
       cmSystemTools::RemoveFile(filename_tmp);
 
       target->AddSource(filename, true);
+
+      auto unity = this->Makefile->GetOrCreateSource(filename);
+      unity->SetProperty("SKIP_UNITY_BUILD_INCLUSION", "ON");
+      unity->SetProperty("UNITY_SOURCE_FILE", filename.c_str());
     }
   }
 }
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;
     }
diff --git a/Source/cmVisualStudio10TargetGenerator.cxx b/Source/cmVisualStudio10TargetGenerator.cxx
index b4f05c7..08ad1c0 100644
--- a/Source/cmVisualStudio10TargetGenerator.cxx
+++ b/Source/cmVisualStudio10TargetGenerator.cxx
@@ -250,6 +250,7 @@ cmVisualStudio10TargetGenerator::cmVisualStudio10TargetGenerator(
   this->InSourceBuild = (this->Makefile->GetCurrentSourceDirectory() ==
                          this->Makefile->GetCurrentBinaryDirectory());
 
+  this->LocalGenerator->AddUnityBuild(target, "");
   this->LocalGenerator->AddPchDependencies(target, "");
 }
 
@@ -2049,6 +2050,17 @@ void cmVisualStudio10TargetGenerator::WriteAllSources(Elem& e0)
   if (this->GeneratorTarget->GetType() > cmStateEnums::UTILITY) {
     return;
   }
+
+  const bool haveUnityBuild =
+    this->GeneratorTarget->GetPropertyAsBool("UNITY_BUILD");
+
+  if (haveUnityBuild &&
+      this->GlobalGenerator->GetVersion() >=
+        cmGlobalVisualStudioGenerator::VS15) {
+    Elem e1(e0, "PropertyGroup");
+    e1.Element("EnableUnitySupport", "true");
+  }
+
   Elem e1(e0, "ItemGroup");
   e1.SetHasElements();
 
@@ -2147,6 +2159,45 @@ void cmVisualStudio10TargetGenerator::WriteAllSources(Elem& e0)
 
       Elem e2(e1, tool);
       this->WriteSource(e2, si.Source);
+
+      bool useNativeUnityBuild = false;
+      if (haveUnityBuild &&
+          this->GlobalGenerator->GetVersion() >=
+            cmGlobalVisualStudioGenerator::VS15) {
+        // Magic value taken from cmGlobalVisualStudioVersionedGenerator.cxx
+        static const std::string vs15 = "141";
+        std::string toolset =
+          this->GlobalGenerator->GetPlatformToolsetString();
+        cmSystemTools::ReplaceString(toolset, "v", "");
+
+        if (toolset.empty() ||
+            cmSystemTools::VersionCompareGreaterEq(toolset, vs15)) {
+          useNativeUnityBuild = true;
+        }
+      }
+
+      if (haveUnityBuild && strcmp(tool, "ClCompile") == 0 &&
+          si.Source->GetProperty("UNITY_SOURCE_FILE")) {
+        if (useNativeUnityBuild) {
+          e2.Attribute(
+            "IncludeInUnityFile",
+            si.Source->GetPropertyAsBool("SKIP_UNITY_BUILD_INCLUSION")
+              ? "false"
+              : "true");
+          e2.Attribute("CustomUnityFile", "true");
+
+          std::string unityDir = cmSystemTools::GetFilenamePath(
+            si.Source->GetProperty("UNITY_SOURCE_FILE"));
+          e2.Attribute("UnityFilesDirectory", unityDir);
+        } else {
+          // Visual Studio versions prior to 2017 do not know about unity
+          // builds, thus we exclude the files alredy part of unity sources.
+          if (!si.Source->GetPropertyAsBool("SKIP_UNITY_BUILD_INCLUSION")) {
+            exclude_configs = si.Configs;
+          }
+        }
+      }
+
       if (si.Kind == cmGeneratorTarget::SourceKindObjectSource) {
         this->OutputSourceSpecificFlags(e2, si.Source);
       }