export: Convert ExportInfo to a struct with meaningful field names

Source/cmExportBuildFileGenerator.cxx

@@ -139,10 +139,9 @@ void cmExportBuildFileGenerator::HandleMissingTarget(
   // The target is not in the export.
   if (!this->AppendMode) {
     auto const& exportInfo = this->FindExportInfo(dependee);
-    auto const& exportFiles = exportInfo.first;
 
-    if (exportFiles.size() == 1) {
-      std::string missingTarget = exportInfo.second;
+    if (exportInfo.Files.size() == 1) {
+      std::string missingTarget = exportInfo.Namespace;
 
       missingTarget += dependee->GetExportName();
       link_libs += missingTarget;
@@ -151,7 +150,7 @@ void cmExportBuildFileGenerator::HandleMissingTarget(
     }
     // We are not appending, so all exported targets should be
     // known here.  This is probably user-error.
-    this->ComplainAboutMissingTarget(depender, dependee, exportFiles);
+    this->ComplainAboutMissingTarget(depender, dependee, exportInfo.Files);
   }
   // Assume the target will be exported by another command.
   // Append it with the export namespace.

Source/cmExportFileGenerator.h

@@ -8,7 +8,6 @@
 #include <map>
 #include <set>
 #include <string>
-#include <utility>
 #include <vector>
 
 #include <cm/string_view>
@@ -133,7 +132,11 @@ protected:
 
   virtual void ReportError(std::string const& errorMessage) const = 0;
 
-  using ExportInfo = std::pair<std::vector<std::string>, std::string>;
+  struct ExportInfo
+  {
+    std::vector<std::string> Files;
+    std::string Namespace;
+  };
 
   /** Find the set of export files and the unique namespace (if any) for a
    *  target. */

Source/cmExportInstallFileGenerator.cxx

@@ -247,10 +247,9 @@ void cmExportInstallFileGenerator::HandleMissingTarget(
   cmGeneratorTarget* dependee)
 {
   auto const& exportInfo = this->FindExportInfo(dependee);
-  auto const& exportFiles = exportInfo.first;
 
-  if (exportFiles.size() == 1) {
-    std::string missingTarget = exportInfo.second;
+  if (exportInfo.Files.size() == 1) {
+    std::string missingTarget = exportInfo.Namespace;
 
     missingTarget += dependee->GetExportName();
     link_libs += missingTarget;
@@ -258,7 +257,7 @@ void cmExportInstallFileGenerator::HandleMissingTarget(
   } else {
     // All exported targets should be known here and should be unique.
     // This is probably user-error.
-    this->ComplainAboutMissingTarget(depender, dependee, exportFiles);
+    this->ComplainAboutMissingTarget(depender, dependee, exportInfo.Files);
   }
 }
 

Source/cmExportPackageInfoGenerator.cxx

@@ -266,8 +266,8 @@ bool cmExportPackageInfoGenerator::NoteLinkedTarget(
 
   // Target belongs to another export from this build.
   auto const& exportInfo = this->FindExportInfo(linkedTarget);
-  if (exportInfo.first.size() == 1) {
-    auto const& linkNamespace = exportInfo.second;
+  if (exportInfo.Files.size() == 1) {
+    auto const& linkNamespace = exportInfo.Namespace;
     if (!cmHasSuffix(linkNamespace, "::")) {
       target->Makefile->IssueMessage(
         MessageType::FATAL_ERROR,