VS: Add support for Utf8Enconding when using VS 16.10+

On VS 16.10 Preview 2 or above, generate `UseUtf8Encoding`
instead of `StdOutEncoding=UTF-8` in `.vcxproj` files.

Fixes: #22032

4 files changed, 22 insertions, 1 deletions

diff --git a/Source/cmGlobalVisualStudio10Generator.h b/Source/cmGlobalVisualStudio10Generator.h
index 646dbe2..b7ae1ee 100644
--- a/Source/cmGlobalVisualStudio10Generator.h
+++ b/Source/cmGlobalVisualStudio10Generator.h
@@ -138,6 +138,8 @@ public:
 
   virtual bool IsStdOutEncodingSupported() const { return false; }
 
+  virtual bool IsUtf8EncodingSupported() const { return false; }
+
   static std::string GetInstalledNsightTegraVersion();
 
   /** Return the first two components of CMAKE_SYSTEM_VERSION.  */
diff --git a/Source/cmGlobalVisualStudioVersionedGenerator.cxx b/Source/cmGlobalVisualStudioVersionedGenerator.cxx
index 384aa66..c8213c5 100644
--- a/Source/cmGlobalVisualStudioVersionedGenerator.cxx
+++ b/Source/cmGlobalVisualStudioVersionedGenerator.cxx
@@ -417,6 +417,21 @@ bool cmGlobalVisualStudioVersionedGenerator::IsStdOutEncodingSupported() const
           cmSystemTools::VersionCompareGreaterEq(*vsVer, vsVer16_7_P2));
 }
 
+bool cmGlobalVisualStudioVersionedGenerator::IsUtf8EncodingSupported() const
+{
+  // Supported from Visual Studio 16.10 Preview 2.
+  if (this->Version > cmGlobalVisualStudioGenerator::VSVersion::VS16) {
+    return true;
+  }
+  if (this->Version < cmGlobalVisualStudioGenerator::VSVersion::VS16) {
+    return false;
+  }
+  static std::string const vsVer16_10_P2 = "16.10.31213.239";
+  cm::optional<std::string> vsVer = this->GetVSInstanceVersion();
+  return (vsVer &&
+          cmSystemTools::VersionCompareGreaterEq(*vsVer, vsVer16_10_P2));
+}
+
 const char*
 cmGlobalVisualStudioVersionedGenerator::GetAndroidApplicationTypeRevision()
   const
diff --git a/Source/cmGlobalVisualStudioVersionedGenerator.h b/Source/cmGlobalVisualStudioVersionedGenerator.h
index db4a0ba..e6c19e4 100644
--- a/Source/cmGlobalVisualStudioVersionedGenerator.h
+++ b/Source/cmGlobalVisualStudioVersionedGenerator.h
@@ -35,6 +35,8 @@ public:
 
   bool IsStdOutEncodingSupported() const override;
 
+  bool IsUtf8EncodingSupported() const override;
+
   const char* GetAndroidApplicationTypeRevision() const override;
 
 protected:
diff --git a/Source/cmVisualStudio10TargetGenerator.cxx b/Source/cmVisualStudio10TargetGenerator.cxx
index b79c6fd..11a8b1f 100644
--- a/Source/cmVisualStudio10TargetGenerator.cxx
+++ b/Source/cmVisualStudio10TargetGenerator.cxx
@@ -5115,7 +5115,9 @@ std::string cmVisualStudio10TargetGenerator::GetCMakeFilePath(
 
 void cmVisualStudio10TargetGenerator::WriteStdOutEncodingUtf8(Elem& e1)
 {
-  if (this->GlobalGenerator->IsStdOutEncodingSupported()) {
+  if (this->GlobalGenerator->IsUtf8EncodingSupported()) {
+    e1.Element("UseUtf8Encoding", "Always");
+  } else if (this->GlobalGenerator->IsStdOutEncodingSupported()) {
     e1.Element("StdOutEncoding", "UTF-8");
   }
 }