VS: Add source file property to set hlsl debug and optimization flags

Add `VS_SHADER_DISABLE_OPTIMIZATIONS` and `VS_SHADER_ENABLE_DEBUG`
source file properties to control these settings on `.hlsl` files in the
VS generator.

Fixes: #17406

Help/manual/cmake-properties.7.rst

@@ -390,6 +390,8 @@ Properties on Source Files
    /prop_sf/VS_DEPLOYMENT_LOCATION
    /prop_sf/VS_INCLUDE_IN_VSIX
    /prop_sf/VS_RESOURCE_GENERATOR
+   /prop_sf/VS_SHADER_DISABLE_OPTIMIZATIONS
+   /prop_sf/VS_SHADER_ENABLE_DEBUG
    /prop_sf/VS_SHADER_ENTRYPOINT
    /prop_sf/VS_SHADER_FLAGS
    /prop_sf/VS_SHADER_MODEL

Help/prop_sf/VS_SHADER_DISABLE_OPTIMIZATIONS.rst

+VS_SHADER_DISABLE_OPTIMIZATIONS
+-------------------------------
+
+Disable compiler optimizations for an ``.hlsl`` source file.  This adds the
+``-Od`` flag to the command line for the FxCompiler tool.  Specify the value
+``true`` for this property to disable compiler optimizations.

Help/prop_sf/VS_SHADER_ENABLE_DEBUG.rst

+VS_SHADER_ENABLE_DEBUG
+----------------------
+
+Enable debugging information for an ``.hlsl`` source file.  This adds the
+``-Zi`` flag to the command line for the FxCompiler tool.  Specify the value
+``true`` to generate debugging information for the compiled shader.

Help/release/dev/vs-hlsl-opt-dbg.rst

+vs-hlsl-opt-dbg
+---------------
+
+* Source file properties :prop_sf:`VS_SHADER_DISABLE_OPTIMIZATIONS` and
+  :prop_sf:`VS_SHADER_ENABLE_DEBUG` have been added to specify more
+  details of ``.hlsl`` sources with :ref:`Visual Studio Generators`.

Source/cmVisualStudio10TargetGenerator.cxx

@@ -1602,6 +1602,8 @@ void cmVisualStudio10TargetGenerator::WriteExtraSource(cmSourceFile const* sf)
   std::string shaderEntryPoint;
   std::string shaderModel;
   std::string shaderAdditionalFlags;
+  std::string shaderDisableOptimizations;
+  std::string shaderEnableDebug;
   std::string outputHeaderFile;
   std::string variableName;
   std::string settingsGenerator;
@@ -1668,6 +1670,16 @@ void cmVisualStudio10TargetGenerator::WriteExtraSource(cmSourceFile const* sf)
       shaderAdditionalFlags = saf;
       toolHasSettings = true;
     }
+    // Figure out if debug information should be generated
+    if (const char* sed = sf->GetProperty("VS_SHADER_ENABLE_DEBUG")) {
+      shaderEnableDebug = cmSystemTools::IsOn(sed) ? "true" : "false";
+      toolHasSettings = true;
+    }
+    // Figure out if optimizations should be disabled
+    if (const char* sdo = sf->GetProperty("VS_SHADER_DISABLE_OPTIMIZATIONS")) {
+      shaderDisableOptimizations = cmSystemTools::IsOn(sdo) ? "true" : "false";
+      toolHasSettings = true;
+    }
   } else if (ext == "jpg" || ext == "png") {
     tool = "Image";
   } else if (ext == "resw") {
@@ -1810,6 +1822,16 @@ void cmVisualStudio10TargetGenerator::WriteExtraSource(cmSourceFile const* sf)
         this->WriteString("</VariableName>\n", 0);
       }
     }
+    if (!shaderEnableDebug.empty()) {
+      this->WriteString("<EnableDebuggingInformation>", 3);
+      (*this->BuildFileStream) << cmVS10EscapeXML(shaderEnableDebug)
+                               << "</EnableDebuggingInformation>\n";
+    }
+    if (!shaderDisableOptimizations.empty()) {
+      this->WriteString("<DisableOptimizations>", 3);
+      (*this->BuildFileStream) << cmVS10EscapeXML(shaderDisableOptimizations)
+                               << "</DisableOptimizations>\n";
+    }
     if (!shaderAdditionalFlags.empty()) {
       this->WriteString("<AdditionalOptions>", 3);
       (*this->BuildFileStream) << cmVS10EscapeXML(shaderAdditionalFlags)