Merge topic 'autogen_cmStrCat'

ca2923110c Autogen: Modernize to use cmStrCat for string concatenation
d02a99d9d3 Autogen: Modernize code to use cm::string_view for the info writer

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !3663

7 files changed, 174 insertions, 285 deletions

diff --git a/Source/cmQtAutoGen.cxx b/Source/cmQtAutoGen.cxx
index 712e22c..3026b33 100644
--- a/Source/cmQtAutoGen.cxx
+++ b/Source/cmQtAutoGen.cxx
@@ -353,9 +353,8 @@ bool cmQtAutoGen::RccLister::list(std::string const& qrcFile,
 
       // Log command
       if (verbose) {
-        std::string msg = "Running command:\n";
-        msg += QuotedCommand(cmd);
-        msg += '\n';
+        std::string msg =
+          cmStrCat("Running command:\n", QuotedCommand(cmd), '\n');
         cmSystemTools::Stdout(msg);
       }
 
diff --git a/Source/cmQtAutoGenGlobalInitializer.cxx b/Source/cmQtAutoGenGlobalInitializer.cxx
index f172b77..ca5a587 100644
--- a/Source/cmQtAutoGenGlobalInitializer.cxx
+++ b/Source/cmQtAutoGenGlobalInitializer.cxx
@@ -1,8 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
 #include "cmQtAutoGenGlobalInitializer.h"
-#include "cmQtAutoGen.h"
-#include "cmQtAutoGenInitializer.h"
 
 #include "cmCustomCommandLines.h"
 #include "cmDuration.h"
@@ -11,15 +9,18 @@
 #include "cmMakefile.h"
 #include "cmMessageType.h"
 #include "cmProcessOutput.h"
+#include "cmQtAutoGen.h"
+#include "cmQtAutoGenInitializer.h"
 #include "cmState.h"
 #include "cmStateTypes.h"
+#include "cmStringAlgorithms.h"
 #include "cmSystemTools.h"
 #include "cmTarget.h"
 
-#include <utility>
-
 #include "cm_memory.hxx"
 
+#include <utility>
+
 cmQtAutoGenGlobalInitializer::Keywords::Keywords()
   : AUTOMOC("AUTOMOC")
   , AUTOUIC("AUTOUIC")
@@ -119,23 +120,17 @@ cmQtAutoGenGlobalInitializer::cmQtAutoGenGlobalInitializer(
         bool const uicDisabled = (uic && !uicAvailable);
         bool const rccDisabled = (rcc && !rccAvailable);
         if (mocDisabled || uicDisabled || rccDisabled) {
-          std::string msg = "AUTOGEN: No valid Qt version found for target ";
-          msg += target->GetName();
-          msg += ". ";
-          msg += cmQtAutoGen::Tools(mocDisabled, uicDisabled, rccDisabled);
-          msg += " disabled.  Consider adding:\n";
-          {
-            std::string version = (qtVersion.second == 0)
-              ? std::string("<QTVERSION>")
-              : std::to_string(qtVersion.second);
-            std::string comp = uicDisabled ? "Widgets" : "Core";
-            msg += "  find_package(Qt";
-            msg += version;
-            msg += " COMPONENTS ";
-            msg += comp;
-            msg += ")\n";
-          }
-          msg += "to your CMakeLists.txt file.";
+          cmAlphaNum version = (qtVersion.second == 0)
+            ? cmAlphaNum("<QTVERSION>")
+            : cmAlphaNum(qtVersion.second);
+          cmAlphaNum component = uicDisabled ? "Widgets" : "Core";
+
+          std::string const msg = cmStrCat(
+            "AUTOGEN: No valid Qt version found for target ",
+            target->GetName(), ".  ",
+            cmQtAutoGen::Tools(mocDisabled, uicDisabled, rccDisabled),
+            " disabled.  Consider adding:\n", "  find_package(Qt", version,
+            " COMPONENTS ", component, ")\n", "to your CMakeLists.txt file.");
           target->Makefile->IssueMessage(MessageType::AUTHOR_WARNING, msg);
         }
         if (mocIsValid || uicIsValid || rccIsValid) {
diff --git a/Source/cmQtAutoGenInitializer.cxx b/Source/cmQtAutoGenInitializer.cxx
index da6094d..360df25 100644
--- a/Source/cmQtAutoGenInitializer.cxx
+++ b/Source/cmQtAutoGenInitializer.cxx
@@ -156,30 +156,27 @@ std::string cmQtAutoGenInitializer::InfoWriter::ListJoin(IT it_begin,
   return res;
 }
 
-std::string cmQtAutoGenInitializer::InfoWriter::ConfigKey(
-  const char* key, std::string const& config)
+inline std::string cmQtAutoGenInitializer::InfoWriter::ConfigKey(
+  cm::string_view key, std::string const& config)
 {
-  std::string ckey = key;
-  ckey += '_';
-  ckey += config;
-  return ckey;
+  return cmStrCat(key, "_", config);
 }
 
-void cmQtAutoGenInitializer::InfoWriter::Write(const char* key,
+void cmQtAutoGenInitializer::InfoWriter::Write(cm::string_view key,
                                                std::string const& value)
 {
   Ofs_ << "set(" << key << " " << cmOutputConverter::EscapeForCMake(value)
        << ")\n";
 };
 
-void cmQtAutoGenInitializer::InfoWriter::WriteUInt(const char* key,
+void cmQtAutoGenInitializer::InfoWriter::WriteUInt(cm::string_view key,
                                                    unsigned int value)
 {
   Ofs_ << "set(" << key << " " << value << ")\n";
 };
 
 template <class C>
-void cmQtAutoGenInitializer::InfoWriter::WriteStrings(const char* key,
+void cmQtAutoGenInitializer::InfoWriter::WriteStrings(cm::string_view key,
                                                       C const& container)
 {
   Ofs_ << "set(" << key << " \""
@@ -187,31 +184,29 @@ void cmQtAutoGenInitializer::InfoWriter::WriteStrings(const char* key,
 }
 
 void cmQtAutoGenInitializer::InfoWriter::WriteConfig(
-  const char* key, std::map<std::string, std::string> const& map)
+  cm::string_view key, std::map<std::string, std::string> const& map)
 {
   for (auto const& item : map) {
-    Write(ConfigKey(key, item.first).c_str(), item.second);
+    Write(ConfigKey(key, item.first), item.second);
   }
 };
 
 template <class C>
 void cmQtAutoGenInitializer::InfoWriter::WriteConfigStrings(
-  const char* key, std::map<std::string, C> const& map)
+  cm::string_view key, std::map<std::string, C> const& map)
 {
   for (auto const& item : map) {
-    WriteStrings(ConfigKey(key, item.first).c_str(), item.second);
+    WriteStrings(ConfigKey(key, item.first), item.second);
   }
 }
 
 void cmQtAutoGenInitializer::InfoWriter::WriteNestedLists(
-  const char* key, std::vector<std::vector<std::string>> const& lists)
+  cm::string_view key, std::vector<std::vector<std::string>> const& lists)
 {
   std::vector<std::string> seplist;
-  for (const std::vector<std::string>& list : lists) {
-    std::string blist = "{";
-    blist += ListJoin(list.begin(), list.end());
-    blist += "}";
-    seplist.push_back(std::move(blist));
+  seplist.reserve(lists.size());
+  for (std::vector<std::string> const& list : lists) {
+    seplist.push_back(cmStrCat("{", ListJoin(list.begin(), list.end()), "}"));
   }
   Write(key, cmJoin(seplist, cmQtAutoGen::ListSep));
 };
@@ -721,14 +716,13 @@ bool cmQtAutoGenInitializer::InitScanFiles()
       if (muf.MocIt || muf.UicIt) {
         // Search for the default header file and a private header
         std::string const& srcPath = muf.SF->GetFullPath();
-        std::string basePath = cmQtAutoGen::SubDirPrefix(srcPath);
-        basePath += cmSystemTools::GetFilenameWithoutLastExtension(srcPath);
+        std::string basePath =
+          cmStrCat(cmQtAutoGen::SubDirPrefix(srcPath),
+                   cmSystemTools::GetFilenameWithoutLastExtension(srcPath));
         for (auto const& suffix : suffixes) {
           std::string const suffixedPath = basePath + suffix;
           for (auto const& ext : exts) {
-            std::string fullPath = suffixedPath;
-            fullPath += '.';
-            fullPath += ext;
+            std::string fullPath = cmStrCat(suffixedPath, '.', ext);
 
             auto constexpr locationKind = cmSourceFileLocationKind::Known;
             cmSourceFile* sf = makefile->GetSource(fullPath, locationKind);
@@ -833,9 +827,8 @@ bool cmQtAutoGenInitializer::InitScanFiles()
         this->AutogenTarget.DependFiles.insert(muf->RealPath);
       }
     } else if (this->CMP0071Warn) {
-      std::string msg;
-      msg += cmPolicies::GetPolicyWarning(cmPolicies::CMP0071);
-      msg += '\n';
+      std::string msg =
+        cmStrCat(cmPolicies::GetPolicyWarning(cmPolicies::CMP0071), '\n');
       std::string property;
       if (this->Moc.Enabled && this->Uic.Enabled) {
         property = kw.SKIP_AUTOGEN;
@@ -888,18 +881,10 @@ bool cmQtAutoGenInitializer::InitScanFiles()
       for (Qrc& qrc : this->Rcc.Qrcs) {
         qrc.PathChecksum = fpathCheckSum.getPart(qrc.QrcFile);
         // RCC output file name
+        qrc.RccFile = cmStrCat(this->Dir.Build + "/", qrc.PathChecksum,
+                               "/qrc_", qrc.QrcName, ".cpp");
         {
-          std::string rccFile = this->Dir.Build + "/";
-          rccFile += qrc.PathChecksum;
-          rccFile += "/qrc_";
-          rccFile += qrc.QrcName;
-          rccFile += ".cpp";
-          qrc.RccFile = std::move(rccFile);
-        }
-        {
-          std::string base = this->Dir.Info;
-          base += "/RCC";
-          base += qrc.QrcName;
+          std::string base = cmStrCat(this->Dir.Info, "/RCC", qrc.QrcName);
           if (!qrc.Unique) {
             base += qrc.PathChecksum;
           }
@@ -932,8 +917,7 @@ bool cmQtAutoGenInitializer::InitScanFiles()
         // Replace '-' with '_'. The former is not valid for symbol names.
         std::replace(name.begin(), name.end(), '-', '_');
         if (!qrc.Unique) {
-          name += "_";
-          name += qrc.PathChecksum;
+          name += cmStrCat("_", qrc.PathChecksum);
         }
         std::vector<std::string> nameOpts;
         nameOpts.emplace_back("-name");
@@ -1157,8 +1141,8 @@ bool cmQtAutoGenInitializer::InitRccTargets()
       currentLine.push_back("$<CONFIG>");
       commandLines.push_back(std::move(currentLine));
     }
-    std::string ccComment = "Automatic RCC for ";
-    ccComment += FileProjectRelativePath(makefile, qrc.QrcFile);
+    std::string ccComment = cmStrCat(
+      "Automatic RCC for ", FileProjectRelativePath(makefile, qrc.QrcFile));
 
     if (qrc.Generated || this->Rcc.GlobalTarget) {
       // Create custom rcc target
@@ -1226,9 +1210,8 @@ bool cmQtAutoGenInitializer::SetupCustomTargets()
 {
   // Create info directory on demand
   if (!cmSystemTools::MakeDirectory(this->Dir.Info)) {
-    std::string emsg = ("AutoGen: Could not create directory: ");
-    emsg += Quoted(this->Dir.Info);
-    cmSystemTools::Error(emsg);
+    cmSystemTools::Error(cmStrCat("AutoGen: Could not create directory: ",
+                                  Quoted(this->Dir.Info)));
     return false;
   }
 
@@ -1311,10 +1294,8 @@ bool cmQtAutoGenInitializer::SetupWriteAutogenInfo()
         }
         if (muf->MocIt || muf->UicIt) {
           headers.emplace_back(muf->RealPath);
-          std::string flags;
-          flags += muf->MocIt ? 'M' : 'm';
-          flags += muf->UicIt ? 'U' : 'u';
-          headersFlags.emplace_back(std::move(flags));
+          headersFlags.emplace_back(
+            cmStrCat(muf->MocIt ? "M" : "m", muf->UicIt ? "U" : "u"));
         }
       }
     }
@@ -1323,14 +1304,13 @@ bool cmQtAutoGenInitializer::SetupWriteAutogenInfo()
       cmFilePathChecksum const fpathCheckSum(makefile);
       std::unordered_set<std::string> emitted;
       for (std::string const& hdr : headers) {
-        std::string basePath = fpathCheckSum.getPart(hdr);
-        basePath += "/moc_";
-        basePath += cmSystemTools::GetFilenameWithoutLastExtension(hdr);
-        for (unsigned int ii = 1; ii != 1024; ++ii) {
+        std::string basePath =
+          cmStrCat(fpathCheckSum.getPart(hdr), "/moc_",
+                   cmSystemTools::GetFilenameWithoutLastExtension(hdr));
+        for (int ii = 1; ii != 1024; ++ii) {
           std::string path = basePath;
           if (ii > 1) {
-            path += '_';
-            path += std::to_string(ii);
+            path += cmStrCat("_", ii);
           }
           path += ".cpp";
           if (emitted.emplace(path).second) {
@@ -1369,10 +1349,8 @@ bool cmQtAutoGenInitializer::SetupWriteAutogenInfo()
         }
         if (muf->MocIt || muf->UicIt) {
           sources.emplace_back(muf->RealPath);
-          std::string flags;
-          flags += muf->MocIt ? 'M' : 'm';
-          flags += muf->UicIt ? 'U' : 'u';
-          sourcesFlags.emplace_back(std::move(flags));
+          sourcesFlags.emplace_back(
+            cmStrCat(muf->MocIt ? "M" : "m", muf->UicIt ? "U" : "u"));
         }
       }
     }
@@ -1426,9 +1404,8 @@ bool cmQtAutoGenInitializer::SetupWriteAutogenInfo()
       ofs.WriteStrings("AM_UIC_SEARCH_PATHS", this->Uic.SearchPaths);
     }
   } else {
-    std::string err = "AutoGen: Could not write file ";
-    err += this->AutogenTarget.InfoFile;
-    cmSystemTools::Error(err);
+    cmSystemTools::Error(cmStrCat("AutoGen: Could not write file ",
+                                  this->AutogenTarget.InfoFile));
     return false;
   }
 
@@ -1467,9 +1444,8 @@ bool cmQtAutoGenInitializer::SetupWriteRccInfo()
       ofs.WriteStrings("ARCC_OPTIONS", qrc.Options);
       ofs.WriteStrings("ARCC_INPUTS", qrc.Resources);
     } else {
-      std::string err = "AutoRcc: Could not write file ";
-      err += qrc.InfoFile;
-      cmSystemTools::Error(err);
+      cmSystemTools::Error(
+        cmStrCat("AutoRcc: Could not write file ", qrc.InfoFile));
       return false;
     }
   }
@@ -1524,13 +1500,10 @@ bool cmQtAutoGenInitializer::AddToSourceGroup(std::string const& fileName,
     if (!groupName.empty()) {
       sourceGroup = makefile->GetOrCreateSourceGroup(groupName);
       if (sourceGroup == nullptr) {
-        std::string err;
-        err += genNameUpper;
-        err += " error in ";
-        err += property;
-        err += ": Could not find or create the source group ";
-        err += cmQtAutoGen::Quoted(groupName);
-        cmSystemTools::Error(err);
+        cmSystemTools::Error(
+          cmStrCat(genNameUpper, " error in ", property,
+                   ": Could not find or create the source group ",
+                   cmQtAutoGen::Quoted(groupName)));
         return false;
       }
     }
@@ -1622,12 +1595,8 @@ bool cmQtAutoGenInitializer::GetQtExecutable(GenVarsT& genVars,
                                              bool ignoreMissingTarget) const
 {
   auto print_err = [this, &genVars](std::string const& err) {
-    std::string msg = genVars.GenNameUpper;
-    msg += " for target ";
-    msg += this->Target->GetName();
-    msg += ": ";
-    msg += err;
-    cmSystemTools::Error(msg);
+    cmSystemTools::Error(cmStrCat(genVars.GenNameUpper, " for target ",
+                                  this->Target->GetName(), ": ", err));
   };
 
   // Custom executable
@@ -1687,11 +1656,8 @@ bool cmQtAutoGenInitializer::GetQtExecutable(GenVarsT& genVars,
           std::make_shared<cmQtAutoGen::CompilerFeatures>();
         return true;
       }
-      std::string err = "Could not find ";
-      err += executable;
-      err += " executable target ";
-      err += targetName;
-      print_err(err);
+      print_err(cmStrCat("Could not find ", executable, " executable target ",
+                         targetName));
       return false;
     }
   }
diff --git a/Source/cmQtAutoGenInitializer.h b/Source/cmQtAutoGenInitializer.h
index eb0d35e..7d72cad 100644
--- a/Source/cmQtAutoGenInitializer.h
+++ b/Source/cmQtAutoGenInitializer.h
@@ -6,6 +6,7 @@
 #include "cmConfigure.h" // IWYU pragma: keep
 #include "cmGeneratedFileStream.h"
 #include "cmQtAutoGen.h"
+#include "cm_string_view.hxx"
 
 #include <map>
 #include <memory>
@@ -85,24 +86,24 @@ public:
     /// @return True if the file is open
     explicit operator bool() const { return static_cast<bool>(Ofs_); }
 
-    void Write(const char* text) { Ofs_ << text; }
-    void Write(const char* key, std::string const& value);
-    void WriteUInt(const char* key, unsigned int value);
+    void Write(cm::string_view text) { Ofs_ << text; }
+    void Write(cm::string_view, std::string const& value);
+    void WriteUInt(cm::string_view, unsigned int value);
 
     template <class C>
-    void WriteStrings(const char* key, C const& container);
-    void WriteConfig(const char* key,
+    void WriteStrings(cm::string_view, C const& container);
+    void WriteConfig(cm::string_view,
                      std::map<std::string, std::string> const& map);
     template <class C>
-    void WriteConfigStrings(const char* key,
+    void WriteConfigStrings(cm::string_view,
                             std::map<std::string, C> const& map);
-    void WriteNestedLists(const char* key,
+    void WriteNestedLists(cm::string_view,
                           std::vector<std::vector<std::string>> const& lists);
 
   private:
     template <class IT>
     static std::string ListJoin(IT it_begin, IT it_end);
-    static std::string ConfigKey(const char* key, std::string const& config);
+    static std::string ConfigKey(cm::string_view, std::string const& config);
 
   private:
     cmGeneratedFileStream Ofs_;
diff --git a/Source/cmQtAutoGenerator.cxx b/Source/cmQtAutoGenerator.cxx
index 2516d84..0ad87b1 100644
--- a/Source/cmQtAutoGenerator.cxx
+++ b/Source/cmQtAutoGenerator.cxx
@@ -1,17 +1,17 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
 #include "cmQtAutoGenerator.h"
-#include "cmQtAutoGen.h"
-
-#include "cmsys/FStream.hxx"
 
 #include "cm_memory.hxx"
+#include "cmsys/FStream.hxx"
 
 #include "cmGlobalGenerator.h"
 #include "cmMakefile.h"
+#include "cmQtAutoGen.h"
 #include "cmState.h"
 #include "cmStateDirectory.h"
 #include "cmStateSnapshot.h"
+#include "cmStringAlgorithms.h"
 #include "cmSystemTools.h"
 #include "cmake.h"
 
@@ -60,19 +60,13 @@ void cmQtAutoGenerator::Logger::SetColorOutput(bool value)
 
 std::string cmQtAutoGenerator::Logger::HeadLine(std::string const& title)
 {
-  std::string head = title;
-  head += '\n';
-  head.append(head.size() - 1, '-');
-  head += '\n';
-  return head;
+  return cmStrCat(title, "\n", std::string(title.size(), '-'), "\n");
 }
 
 void cmQtAutoGenerator::Logger::Info(GenT genType,
                                      std::string const& message) const
 {
-  std::string msg = GeneratorName(genType);
-  msg += ": ";
-  msg += message;
+  std::string msg = cmStrCat(GeneratorName(genType), ": ", message);
   if (msg.back() != '\n') {
     msg.push_back('\n');
   }
@@ -110,19 +104,13 @@ void cmQtAutoGenerator::Logger::WarningFile(GenT genType,
                                             std::string const& filename,
                                             std::string const& message) const
 {
-  std::string msg = "  ";
-  msg += Quoted(filename);
-  msg.push_back('\n');
-  // Message
-  msg += message;
-  Warning(genType, msg);
+  Warning(genType, cmStrCat("  ", Quoted(filename), "\n", message));
 }
 
 void cmQtAutoGenerator::Logger::Error(GenT genType,
                                       std::string const& message) const
 {
-  std::string msg;
-  msg += HeadLine(GeneratorName(genType) + " error");
+  std::string msg = HeadLine(GeneratorName(genType) + " error");
   // Message
   msg += message;
   if (msg.back() != '\n') {
@@ -139,12 +127,7 @@ void cmQtAutoGenerator::Logger::ErrorFile(GenT genType,
                                           std::string const& filename,
                                           std::string const& message) const
 {
-  std::string emsg = "  ";
-  emsg += Quoted(filename);
-  emsg += '\n';
-  // Message
-  emsg += message;
-  Error(genType, emsg);
+  Error(genType, cmStrCat("  ", Quoted(filename), '\n', message));
 }
 
 void cmQtAutoGenerator::Logger::ErrorCommand(
@@ -280,10 +263,8 @@ bool cmQtAutoGenerator::Run(std::string const& infoFile,
   InfoFile_ = infoFile;
   cmSystemTools::ConvertToUnixSlashes(InfoFile_);
   if (!InfoFileTime_.Load(InfoFile_)) {
-    std::string msg = "AutoGen: The info file ";
-    msg += Quoted(InfoFile_);
-    msg += " is not readable\n";
-    cmSystemTools::Stderr(msg);
+    cmSystemTools::Stderr(cmStrCat("AutoGen: The info file ",
+                                   Quoted(InfoFile_), " is not readable\n"));
     return false;
   }
   InfoDir_ = cmSystemTools::GetFilenamePath(infoFile);
diff --git a/Source/cmQtAutoMocUic.cxx b/Source/cmQtAutoMocUic.cxx
index 0801c24..e693816 100644
--- a/Source/cmQtAutoMocUic.cxx
+++ b/Source/cmQtAutoMocUic.cxx
@@ -302,10 +302,9 @@ void cmQtAutoMocUic::JobMocPredefsT::Process()
       }
       // Execute command
       if (!RunProcess(GenT::MOC, result, cmd, reason.get())) {
-        std::string msg = "The content generation command for ";
-        msg += Quoted(predefsFileRel);
-        msg += " failed.\n";
-        msg += result.ErrorMessage;
+        std::string msg =
+          cmStrCat("The content generation command for ",
+                   Quoted(predefsFileRel), " failed.\n", result.ErrorMessage);
         LogCommandError(GenT::MOC, msg, cmd, result.StdOut);
         return;
       }
@@ -314,9 +313,8 @@ void cmQtAutoMocUic::JobMocPredefsT::Process()
     // (Re)write predefs file only on demand
     if (cmQtAutoGenerator::FileDiffers(predefsFileAbs, result.StdOut)) {
       if (!cmQtAutoGenerator::FileWrite(predefsFileAbs, result.StdOut)) {
-        std::string msg = "Writing ";
-        msg += Quoted(predefsFileRel);
-        msg += " failed.";
+        std::string msg =
+          cmStrCat("Writing ", Quoted(predefsFileRel), " failed.");
         LogFileError(GenT::MOC, predefsFileAbs, msg);
         return;
       }
@@ -326,9 +324,8 @@ void cmQtAutoMocUic::JobMocPredefsT::Process()
         Log().Info(GenT::MOC, "Touching " + Quoted(predefsFileRel));
       }
       if (!cmSystemTools::Touch(predefsFileAbs, false)) {
-        std::string msg = "Touching ";
-        msg += Quoted(predefsFileAbs);
-        msg += " failed.";
+        std::string msg =
+          cmStrCat("Touching ", Quoted(predefsFileAbs), " failed.");
         LogFileError(GenT::MOC, predefsFileAbs, msg);
         return;
       }
@@ -663,13 +660,11 @@ bool cmQtAutoMocUic::JobEvaluateT::MocEvalSource(
   if (!sourceIncludesDotMoc && !parseData.Macro.empty() &&
       !(relaxedMode && sourceIncludesMocUnderscore)) {
     {
-      std::string emsg = "The file contains a ";
-      emsg += Quoted(parseData.Macro);
-      emsg += " macro, but does not include ";
-      emsg += Quoted(sourceBase + ".moc");
-      emsg += "!\nConsider to\n  - add #include \"";
-      emsg += sourceBase;
-      emsg += ".moc\"\n  - enable SKIP_AUTOMOC for this file";
+      std::string emsg =
+        cmStrCat("The file contains a ", Quoted(parseData.Macro),
+                 " macro, but does not include ", Quoted(sourceBase + ".moc"),
+                 "!\nConsider to\n  - add #include \"", sourceBase,
+                 ".moc\"\n  - enable SKIP_AUTOMOC for this file");
       LogFileError(GenT::MOC, sourceFile.FileName, emsg);
     }
     return false;
@@ -700,18 +695,14 @@ bool cmQtAutoMocUic::JobEvaluateT::MocEvalSource(
       // used. This is for KDE4 compatibility.
       {
         // Issue a warning
-        std::string msg = "The file contains a ";
-        msg += Quoted(parseData.Macro);
-        msg += " macro, but does not include ";
-        msg += Quoted(sourceBase + ".moc");
-        msg += ".\nInstead it includes ";
-        msg += Quoted(incKey.Key);
-        msg += ".\nRunning moc on the source\n  ";
-        msg += Quoted(sourceFile.FileName);
-        msg += "!\nBetter include ";
-        msg += Quoted(sourceBase + ".moc");
-        msg += " for compatibility with regular mode.\n";
-        msg += "This is a CMAKE_AUTOMOC_RELAXED_MODE warning.\n";
+        std::string msg = cmStrCat(
+          "The file contains a ", Quoted(parseData.Macro),
+          " macro, but does not include ", Quoted(sourceBase + ".moc"),
+          ".\nInstead it includes ", Quoted(incKey.Key),
+          ".\nRunning moc on the source\n  ", Quoted(sourceFile.FileName),
+          "!\nBetter include ", Quoted(sourceBase + ".moc"),
+          " for compatibility with regular mode.\n",
+          "This is a CMAKE_AUTOMOC_RELAXED_MODE warning.\n");
         Log().WarningFile(GenT::MOC, sourceFile.FileName, msg);
       }
       // Create mapping
@@ -764,28 +755,22 @@ bool cmQtAutoMocUic::JobEvaluateT::MocEvalSource(
       }
       // Issue a warning
       if (ownMoc && parseData.Macro.empty()) {
-        std::string msg = "The file includes the moc file ";
-        msg += Quoted(incKey.Key);
-        msg += ", but does not contain a\n";
-        msg += MocConst().MacrosString();
-        msg += " macro.\nRunning moc on the header\n  ";
-        msg += Quoted(header->FileName);
-        msg += "!\nBetter include ";
-        msg += Quoted("moc_" + incKey.Base + ".cpp");
-        msg += " for a compatibility with regular mode.\n";
-        msg += "This is a CMAKE_AUTOMOC_RELAXED_MODE warning.\n";
+        std::string msg = cmStrCat(
+          "The file includes the moc file ", Quoted(incKey.Key),
+          ", but does not contain a\n", MocConst().MacrosString(),
+          " macro.\nRunning moc on the header\n  ", Quoted(header->FileName),
+          "!\nBetter include ", Quoted("moc_" + incKey.Base + ".cpp"),
+          " for a compatibility with regular mode.\n",
+          "This is a CMAKE_AUTOMOC_RELAXED_MODE warning.\n");
         Log().WarningFile(GenT::MOC, sourceFile.FileName, msg);
       } else {
-        std::string msg = "The file includes the moc file ";
-        msg += Quoted(incKey.Key);
-        msg += " instead of ";
-        msg += Quoted("moc_" + incKey.Base + ".cpp");
-        msg += ".\nRunning moc on the header\n  ";
-        msg += Quoted(header->FileName);
-        msg += "!\nBetter include ";
-        msg += Quoted("moc_" + incKey.Base + ".cpp");
-        msg += " for compatibility with regular mode.\n";
-        msg += "This is a CMAKE_AUTOMOC_RELAXED_MODE warning.\n";
+        std::string msg = cmStrCat(
+          "The file includes the moc file ", Quoted(incKey.Key),
+          " instead of ", Quoted("moc_" + incKey.Base + ".cpp"),
+          ".\nRunning moc on the header\n  ", Quoted(header->FileName),
+          "!\nBetter include ", Quoted("moc_" + incKey.Base + ".cpp"),
+          " for compatibility with regular mode.\n",
+          "This is a CMAKE_AUTOMOC_RELAXED_MODE warning.\n");
         Log().WarningFile(GenT::MOC, sourceFile.FileName, msg);
       }
       // Create mapping
@@ -811,11 +796,9 @@ bool cmQtAutoMocUic::JobEvaluateT::MocEvalSource(
       }
       // Accept but issue a warning if moc isn't required
       if (parseData.Macro.empty()) {
-        std::string msg = "The file includes the moc file ";
-        msg += Quoted(incKey.Key);
-        msg += ", but does not contain a ";
-        msg += MocConst().MacrosString();
-        msg += " macro.";
+        std::string msg = cmStrCat(
+          "The file includes the moc file ", Quoted(incKey.Key),
+          ", but does not contain a ", MocConst().MacrosString(), " macro.");
         Log().WarningFile(GenT::MOC, sourceFile.FileName, msg);
       }
       // Create mapping
@@ -841,9 +824,7 @@ cmQtAutoMocUic::JobEvaluateT::MocFindIncludedHeader(
   }
   // Search in include directories
   for (std::string const& path : MocConst().IncludePaths) {
-    std::string testPath = path;
-    testPath += '/';
-    testPath += includeBase;
+    std::string testPath = cmStrCat(path, '/', includeBase);
     SourceFileHandleT res = MocFindHeader(testPath);
     if (res) {
       return res;
@@ -893,10 +874,9 @@ std::string cmQtAutoMocUic::JobEvaluateT::MocMessageTestHeaders(
 {
   std::ostringstream res;
   {
-    std::string exts = ".{";
-    exts += cmJoin(BaseConst().HeaderExtensions, ",");
-    exts += '}';
-    // Compose result string
+    std::string exts =
+      cmStrCat(".{", cmJoin(BaseConst().HeaderExtensions, ","),
+               '}'); // Compose result string
     res << "  " << fileBase << exts << '\n';
     for (std::string const& path : MocConst().IncludePaths) {
       res << "  " << path << '/' << fileBase << exts << '\n';
@@ -914,9 +894,8 @@ bool cmQtAutoMocUic::JobEvaluateT::MocRegisterIncluded(
   if (handle) {
     // Check if the output file would be generated from different source files
     if (handle->SourceFile != sourceFileHandle) {
-      std::string msg = "The source files\n  ";
-      msg += Quoted(includerFileHandle->FileName);
-      msg += '\n';
+      std::string msg = cmStrCat("The source files\n  ",
+                                 Quoted(includerFileHandle->FileName), '\n');
       for (auto const& item : handle->IncluderFiles) {
         msg += "  ";
         msg += Quoted(item->FileName);
@@ -1020,9 +999,8 @@ bool cmQtAutoMocUic::JobEvaluateT::UicRegisterMapping(
     MappingHandleT const& handle = it->second;
     if (handle->SourceFile != uiFileHandle) {
       // The output file already gets generated - from a different .ui file!
-      std::string msg = "The source files\n  ";
-      msg += Quoted(includerFileHandle->FileName);
-      msg += '\n';
+      std::string msg = cmStrCat("The source files\n  ",
+                                 Quoted(includerFileHandle->FileName), '\n');
       for (auto const& item : handle->IncluderFiles) {
         msg += "  ";
         msg += Quoted(item->FileName);
@@ -1063,8 +1041,7 @@ cmQtAutoMocUic::JobEvaluateT::UicFindIncludedUi(
   std::string const& sourceFile, std::string const& sourceDir,
   IncludeKeyT const& incKey) const
 {
-  std::string searchFileName = incKey.Base;
-  searchFileName += ".ui";
+  std::string searchFileName = cmStrCat(incKey.Base, ".ui");
   // Collect search paths list
   std::vector<std::string> testFiles;
   {
@@ -1074,26 +1051,17 @@ cmQtAutoMocUic::JobEvaluateT::UicFindIncludedUi(
     // Vicinity of the source
     testFiles.emplace_back(sourceDir + searchFileName);
     if (!incKey.Dir.empty()) {
-      std::string path = sourceDir;
-      path += incKey.Dir;
-      path += searchFileName;
-      testFiles.emplace_back(path);
+      testFiles.emplace_back(cmStrCat(sourceDir, incKey.Dir, searchFileName));
     }
     // AUTOUIC search paths
     if (!searchPaths.empty()) {
       for (std::string const& sPath : searchPaths) {
-        std::string path = sPath;
-        path += '/';
-        path += searchFileName;
-        testFiles.emplace_back(std::move(path));
+        testFiles.emplace_back(cmStrCat(sPath, '/', searchFileName));
       }
       if (!incKey.Dir.empty()) {
         for (std::string const& sPath : searchPaths) {
-          std::string path = sPath;
-          path += '/';
-          path += incKey.Dir;
-          path += searchFileName;
-          testFiles.emplace_back(std::move(path));
+          testFiles.emplace_back(
+            cmStrCat(sPath, '/', incKey.Dir, searchFileName));
         }
       }
     }
@@ -1118,11 +1086,10 @@ cmQtAutoMocUic::JobEvaluateT::UicFindIncludedUi(
 
   // Log error
   {
-    std::string msg = "The file includes the uic file ";
-    msg += Quoted(incKey.Key);
-    msg += ",\nbut the user interface file ";
-    msg += Quoted(searchFileName);
-    msg += "\ncould not be found in the following locations\n";
+    std::string msg =
+      cmStrCat("The file includes the uic file ", Quoted(incKey.Key),
+               ",\nbut the user interface file ", Quoted(searchFileName),
+               "\ncould not be found in the following locations\n");
     for (std::string const& testFile : testFiles) {
       msg += "  ";
       msg += Quoted(testFile);
@@ -1418,10 +1385,9 @@ void cmQtAutoMocUic::JobMocT::Process()
     }
   } else {
     // Moc command failed
-    std::string msg = "The moc process failed to compile\n  ";
-    msg += Quoted(sourceFile);
-    msg += "\ninto\n  ";
-    msg += Quoted(outputFile);
+    std::string msg =
+      cmStrCat("The moc process failed to compile\n  ", Quoted(sourceFile),
+               "\ninto\n  ", Quoted(outputFile));
     if (Mapping->IncluderFiles.empty()) {
       msg += ".\n";
     } else {
@@ -1467,11 +1433,9 @@ void cmQtAutoMocUic::JobUicT::Process()
     }
   } else {
     // Uic command failed
-    std::string msg = "The uic process failed to compile\n  ";
-    msg += Quoted(sourceFile);
-    msg += "\ninto\n  ";
-    msg += Quoted(outputFile);
-    msg += "\nincluded by\n";
+    std::string msg =
+      cmStrCat("The uic process failed to compile\n  ", Quoted(sourceFile),
+               "\ninto\n  ", Quoted(outputFile), "\nincluded by\n");
     for (auto const& item : Mapping->IncluderFiles) {
       msg += "  ";
       msg += Quoted(item->FileName);
@@ -1564,12 +1528,8 @@ bool cmQtAutoMocUic::Init(cmMakefile* makefile)
         if (length >= 2) {
           std::string::const_iterator itBeg = value.begin() + (pos + 1);
           std::string::const_iterator itEnd = itBeg + (length - 2);
-          {
-            std::string subValue(itBeg, itEnd);
-            std::vector<std::string> list;
-            cmSystemTools::ExpandListArgument(subValue, list);
-            lists.push_back(std::move(list));
-          }
+          lists.emplace_back(
+            cmSystemTools::ExpandedListArgument(std::string(itBeg, itEnd)));
         }
         pos += length;
         pos += ListSep.size();
@@ -1580,9 +1540,7 @@ bool cmQtAutoMocUic::Init(cmMakefile* makefile)
   auto InfoGetConfig = [makefile, this](const char* key) -> std::string {
     const char* valueConf = nullptr;
     {
-      std::string keyConf = key;
-      keyConf += '_';
-      keyConf += InfoConfig();
+      std::string keyConf = cmStrCat(key, '_', InfoConfig());
       valueConf = makefile->GetDefinition(keyConf);
     }
     if (valueConf == nullptr) {
@@ -1653,9 +1611,9 @@ bool cmQtAutoMocUic::Init(cmMakefile* makefile)
     return LogInfoError("CMake executable file name missing.");
   }
   if (!BaseConst_.CMakeExecutableTime.Load(BaseConst_.CMakeExecutable)) {
-    std::string error = "The CMake executable ";
-    error += Quoted(BaseConst_.CMakeExecutable);
-    error += " does not exist.";
+    std::string error =
+      cmStrCat("The CMake executable ", Quoted(BaseConst_.CMakeExecutable),
+               " does not exist.");
     return LogInfoError(error);
   }
   BaseConst_.ParseCacheFile = InfoGetConfig("AM_PARSE_CACHE_FILE");
@@ -1684,9 +1642,9 @@ bool cmQtAutoMocUic::Init(cmMakefile* makefile)
     MocConst_.Enabled = true;
     // Load the executable file time
     if (!MocConst_.ExecutableTime.Load(MocConst_.Executable)) {
-      std::string error = "The moc executable ";
-      error += Quoted(MocConst_.Executable);
-      error += " does not exist.";
+      std::string error =
+        cmStrCat("The moc executable ", Quoted(MocConst_.Executable),
+                 " does not exist.");
       return LogInfoError(error);
     }
     for (std::string& sfl : InfoGetList("AM_MOC_SKIP")) {
@@ -1752,9 +1710,9 @@ bool cmQtAutoMocUic::Init(cmMakefile* makefile)
     UicConst_.Enabled = true;
     // Load the executable file time
     if (!UicConst_.ExecutableTime.Load(UicConst_.Executable)) {
-      std::string error = "The uic executable ";
-      error += Quoted(UicConst_.Executable);
-      error += " does not exist.";
+      std::string error =
+        cmStrCat("The uic executable ", Quoted(UicConst_.Executable),
+                 " does not exist.");
       return LogInfoError(error);
     }
     for (std::string& sfl : InfoGetList("AM_UIC_SKIP")) {
diff --git a/Source/cmQtAutoRcc.cxx b/Source/cmQtAutoRcc.cxx
index 59f632d..c75b2ca 100644
--- a/Source/cmQtAutoRcc.cxx
+++ b/Source/cmQtAutoRcc.cxx
@@ -36,9 +36,7 @@ bool cmQtAutoRcc::Init(cmMakefile* makefile)
                         this](std::string const& key) -> std::string {
     const char* valueConf = nullptr;
     {
-      std::string keyConf = key;
-      keyConf += '_';
-      keyConf += InfoConfig();
+      std::string keyConf = cmStrCat(key, '_', InfoConfig());
       valueConf = makefile->GetDefinition(keyConf);
     }
     if (valueConf == nullptr) {
@@ -82,9 +80,8 @@ bool cmQtAutoRcc::Init(cmMakefile* makefile)
   // - Rcc executable
   RccExecutable_ = InfoGet("ARCC_RCC_EXECUTABLE");
   if (!RccExecutableTime_.Load(RccExecutable_)) {
-    std::string error = "The rcc executable ";
-    error += Quoted(RccExecutable_);
-    error += " does not exist.";
+    std::string error = cmStrCat("The rcc executable ", Quoted(RccExecutable_),
+                                 " does not exist.");
     return LogInfoError(error);
   }
   RccListOptions_ = InfoGetList("ARCC_RCC_LIST_OPTIONS");
@@ -179,10 +176,8 @@ bool cmQtAutoRcc::Process()
 std::string cmQtAutoRcc::MultiConfigOutput() const
 {
   static std::string const suffix = "_CMAKE_";
-  std::string res;
-  res += RccPathChecksum_;
-  res += '/';
-  res += AppendFilenameSuffix(RccFileName_, suffix);
+  std::string res = cmStrCat(RccPathChecksum_, '/',
+                             AppendFilenameSuffix(RccFileName_, suffix));
   return res;
 }
 
@@ -273,9 +268,7 @@ bool cmQtAutoRcc::SettingsFileWrite()
       Log().Info(GenT::RCC, "Writing settings file " + Quoted(SettingsFile_));
     }
     // Write settings file
-    std::string content = "rcc:";
-    content += SettingsString_;
-    content += '\n';
+    std::string content = cmStrCat("rcc:", SettingsString_, '\n');
     std::string error;
     if (!FileWrite(SettingsFile_, content, &error)) {
       Log().ErrorFile(GenT::RCC, SettingsFile_,
@@ -403,10 +396,9 @@ bool cmQtAutoRcc::TestInfoFile()
   // Test if the rcc output file is older than the info file
   if (RccFileTime_.Older(InfoFileTime())) {
     if (Log().Verbose()) {
-      std::string reason = "Touching ";
-      reason += Quoted(RccFileOutput_);
-      reason += " because it is older than ";
-      reason += Quoted(InfoFile());
+      std::string reason =
+        cmStrCat("Touching ", Quoted(RccFileOutput_),
+                 " because it is older than ", Quoted(InfoFile()));
       Log().Info(GenT::RCC, reason);
     }
     // Touch build file
@@ -457,10 +449,9 @@ bool cmQtAutoRcc::GenerateRcc()
   if (!result || (retVal != 0)) {
     // rcc process failed
     {
-      std::string err = "The rcc process failed to compile\n  ";
-      err += Quoted(QrcFile_);
-      err += "\ninto\n  ";
-      err += Quoted(RccFileOutput_);
+      std::string err =
+        cmStrCat("The rcc process failed to compile\n  ", Quoted(QrcFile_),
+                 "\ninto\n  ", Quoted(RccFileOutput_));
       Log().ErrorCommand(GenT::RCC, err, cmd, rccStdOut + rccStdErr);
     }
     cmSystemTools::RemoveFile(RccFileOutput_);
@@ -482,12 +473,10 @@ bool cmQtAutoRcc::GenerateWrapper()
   // Generate a wrapper source file on demand
   if (IsMultiConfig()) {
     // Wrapper file content
-    std::string content;
-    content += "// This is an autogenerated configuration wrapper file.\n";
-    content += "// Changes will be overwritten.\n";
-    content += "#include <";
-    content += MultiConfigOutput();
-    content += ">\n";
+    std::string content =
+      cmStrCat("// This is an autogenerated configuration wrapper file.\n",
+               "// Changes will be overwritten.\n", "#include <",
+               MultiConfigOutput(), ">\n");
 
     // Compare with existing file content
     bool fileDiffers = true;