Precompile headers: Add support for Visual Studio generators

Tested with Visual C++ 2017 on Windows.

Co-Author: Daniel Pfeifer <[email protected]>

Source/cmGlobalVisualStudioGenerator.h

@@ -110,6 +110,13 @@ public:
 
   bool IsIncludeExternalMSProjectSupported() const override { return true; }
 
+  /** Get encoding used by generator for generated source files
+   */
+  codecvt::Encoding GetMakefileEncoding() const override
+  {
+    return codecvt::ANSI;
+  }
+
   class TargetSet : public std::set<cmGeneratorTarget const*>
   {
   };

Source/cmLocalVisualStudio7Generator.cxx

@@ -1320,6 +1320,8 @@ void cmLocalVisualStudio7Generator::WriteVCProjFile(std::ostream& fout,
                                                     const std::string& libName,
                                                     cmGeneratorTarget* target)
 {
+  this->AddPchDependencies(target, "");
+
   std::vector<std::string> configs;
   this->Makefile->GetConfigurations(configs);
 

Source/cmVisualStudio10TargetGenerator.cxx

@@ -249,6 +249,8 @@ cmVisualStudio10TargetGenerator::cmVisualStudio10TargetGenerator(
     this->LocalGenerator->GetTargetDirectory(this->GeneratorTarget);
   this->InSourceBuild = (this->Makefile->GetCurrentSourceDirectory() ==
                          this->Makefile->GetCurrentBinaryDirectory());
+
+  this->LocalGenerator->AddPchDependencies(target, "");
 }
 
 cmVisualStudio10TargetGenerator::~cmVisualStudio10TargetGenerator()
@@ -2145,6 +2147,9 @@ void cmVisualStudio10TargetGenerator::WriteAllSources(Elem& e0)
       if (si.Kind == cmGeneratorTarget::SourceKindObjectSource) {
         this->OutputSourceSpecificFlags(e2, si.Source);
       }
+      if (si.Source->GetPropertyAsBool("SKIP_PRECOMPILE_HEADERS")) {
+        e2.Element("PrecompiledHeader", "NotUsing");
+      }
       if (!exclude_configs.empty()) {
         this->WriteExcludeFromBuild(e2, exclude_configs);
       }
@@ -2626,6 +2631,13 @@ bool cmVisualStudio10TargetGenerator::ComputeClOptions(
     this->IPOEnabledConfigurations.insert(configName);
   }
 
+  // Precompile Headers
+  std::string pchHeader =
+    this->GeneratorTarget->GetPchHeader(configName, linkLanguage);
+  if (this->MSTools && vcxproj == this->ProjectType && pchHeader.empty()) {
+    clOptions.AddFlag("PrecompiledHeader", "NotUsing");
+  }
+
   // Get preprocessor definitions for this directory.
   std::string defineFlags = this->Makefile->GetDefineFlags();
   if (this->MSTools) {
@@ -2641,7 +2653,6 @@ bool cmVisualStudio10TargetGenerator::ComputeClOptions(
         // replace this setting with "true" below.
         clOptions.AddFlag("UseFullPaths", "false");
       }
-      clOptions.AddFlag("PrecompiledHeader", "NotUsing");
       clOptions.AddFlag("AssemblerListingLocation", "$(IntDir)");
     }
   }