cmGlobalGenerator: Convert set insert algorithm to vector algorithms.

Adjust test for new error output.

Source/cmGlobalGenerator.cxx

@@ -3015,7 +3015,7 @@ void cmGlobalGenerator::AddEvaluationFile(const std::string &inputFile,
 //----------------------------------------------------------------------------
 void cmGlobalGenerator::ProcessEvaluationFiles()
 {
-  std::set<std::string> generatedFiles;
+  std::vector<std::string> generatedFiles;
   for(std::vector<cmGeneratorExpressionEvaluationFile*>::const_iterator
       li = this->EvaluationFiles.begin();
       li != this->EvaluationFiles.end();
@@ -3027,16 +3027,24 @@ void cmGlobalGenerator::ProcessEvaluationFiles()
       return;
       }
     std::vector<std::string> files = (*li)->GetFiles();
-    for(std::vector<std::string>::const_iterator fi = files.begin();
-        fi != files.end(); ++fi)
+    std::sort(files.begin(), files.end());
+
+    std::vector<std::string> intersection;
+    std::set_intersection(files.begin(), files.end(),
+                          generatedFiles.begin(), generatedFiles.end(),
+                          std::back_inserter(intersection));
+    if (!intersection.empty())
       {
-      if (!generatedFiles.insert(*fi).second)
-        {
-        cmSystemTools::Error("File to be generated by multiple different "
-          "commands: ", fi->c_str());
-        return;
-        }
+      cmSystemTools::Error("Files to be generated by multiple different "
+        "commands: ", cmWrap('"', intersection, '"', " ").c_str());
+      return;
       }
+
+        generatedFiles.insert(generatedFiles.end(),
+                              files.begin(), files.end());
+    std::vector<std::string>::iterator newIt =
+        generatedFiles.end() - files.size();
+    std::inplace_merge(generatedFiles.begin(), newIt, generatedFiles.end());
     }
 }
 

Tests/RunCMake/File_Generate/CommandConflict-stderr.txt

@@ -1 +1 @@
-CMake Error: File to be generated by multiple different commands: .*CommandConflict-build/output_.*.txt
+CMake Error: Files to be generated by multiple different commands: ".*CommandConflict-build/output_.*.txt"