VS: add missing label in C# project-build events

Source/cmLocalVisualStudio7Generator.cxx

@@ -570,7 +570,17 @@ public:
     this->First = true;
     this->Stream << "\t\t\t<Tool\n\t\t\t\tName=\"" << tool << "\"";
   }
-  void Finish() { this->Stream << (this->First ? "" : "\"") << "/>\n"; }
+  void Finish()
+  {
+    // If any commands were generated, finish constructing them.
+    if (!this->First) {
+      std::string finishScript =
+        this->LG->FinishConstructScript(IsManaged::No);
+      this->Stream << this->LG->EscapeForXML(finishScript) << "\"";
+    }
+
+    this->Stream << "/>\n";
+  }
   void Write(std::vector<cmCustomCommand> const& ccs)
   {
     for (cmCustomCommand const& command : ccs) {
@@ -1808,6 +1818,7 @@ void cmLocalVisualStudio7Generator::WriteCustomRule(
     if (this->FortranProject) {
       cmSystemTools::ReplaceString(script, "$(Configuration)", config);
     }
+    script += this->FinishConstructScript(IsManaged::No);
     /* clang-format off */
     fout << "\t\t\t\t\t<Tool\n"
          << "\t\t\t\t\tName=\"" << customTool << "\"\n"

Source/cmLocalVisualStudioGenerator.cxx

@@ -243,3 +243,20 @@ std::string cmLocalVisualStudioGenerator::ConstructScript(
 
   return script;
 }
+
+std::string cmLocalVisualStudioGenerator::FinishConstructScript(
+  IsManaged isManaged, const std::string& newline)
+{
+  bool useLocal = this->CustomCommandUseLocal();
+
+  // Store the script in a string.
+  std::string script;
+
+  if (useLocal && isManaged == IsManaged::Yes) {
+    // These aren't generated by default for C# projects.
+    script += newline;
+    script += this->GetReportErrorLabel();
+  }
+
+  return script;
+}

Source/cmLocalVisualStudioGenerator.h

@@ -31,8 +31,15 @@ public:
   virtual ~cmLocalVisualStudioGenerator();
 
   /** Construct a script from the given list of command lines.  */
+  enum class IsManaged
+  {
+    No,
+    Yes
+  };
   std::string ConstructScript(cmCustomCommandGenerator const& ccg,
                               const std::string& newline = "\n");
+  std::string FinishConstructScript(IsManaged isManaged,
+                                    const std::string& newline = "\n");
 
   /** Label to which to jump in a batch file after a failed step in a
       sequence of custom commands. */

Source/cmVisualStudio10TargetGenerator.cxx

@@ -1571,6 +1571,10 @@ void cmVisualStudio10TargetGenerator::WriteCustomRule(
         }
       }
     }
+    cmLocalVisualStudioGenerator::IsManaged isManaged = (this->Managed)
+      ? cmLocalVisualStudioGenerator::IsManaged::Yes
+      : cmLocalVisualStudioGenerator::IsManaged::No;
+    script += lg->FinishConstructScript(isManaged);
     if (this->ProjectType == VsProjectType::csproj) {
       std::string name = "CustomCommand_" + c + "_" +
         cmSystemTools::ComputeStringMD5(sourcePath);
@@ -4286,6 +4290,12 @@ void cmVisualStudio10TargetGenerator::WriteEvent(
       stdPipesUTF8 = stdPipesUTF8 || cc.GetStdPipesUTF8();
     }
   }
+  if (!script.empty()) {
+    cmLocalVisualStudioGenerator::IsManaged isManaged = (this->Managed)
+      ? cmLocalVisualStudioGenerator::IsManaged::Yes
+      : cmLocalVisualStudioGenerator::IsManaged::No;
+    script += lg->FinishConstructScript(isManaged);
+  }
   comment = cmVS10EscapeComment(comment);
   if (this->ProjectType != VsProjectType::csproj) {
     Elem e2(e1, name);