clang-tidy: fix warnings from version 7

Fix some warnings that are new since clang-tidy version 4, and update
`.clang-tidy` to suppress the rest.

.clang-tidy

@@ -21,15 +21,18 @@ modernize-*,\
 -modernize-use-using,\
 performance-*,\
 -performance-inefficient-string-concatenation,\
+-performance-inefficient-vector-operation,\
 readability-*,\
 -readability-function-size,\
 -readability-identifier-naming,\
 -readability-implicit-bool-cast,\
+-readability-implicit-bool-conversion,\
 -readability-inconsistent-declaration-parameter-name,\
 -readability-named-parameter,\
 -readability-redundant-declaration,\
 -readability-redundant-member-init,\
 -readability-simplify-boolean-expr,\
+-readability-static-accessed-through-instance,\
 "
 HeaderFilterRegex: 'Source/cm[^/]*\.(h|hxx|cxx)$'
 ...

Source/QtDialog/AddCacheEntry.cxx

@@ -21,8 +21,8 @@ AddCacheEntry::AddCacheEntry(QWidget* p, const QStringList& varNames,
   , VarTypes(varTypes)
 {
   this->setupUi(this);
-  for (int i = 0; i < NumTypes; i++) {
-    this->Type->addItem(TypeStrings[i]);
+  for (auto const& elem : TypeStrings) {
+    this->Type->addItem(elem);
   }
   QWidget* cb = new QCheckBox();
   QWidget* path = new QCMakePathEditor();

Source/cmELF.cxx

@@ -684,7 +684,7 @@ cmELF::cmELF(const char* fname)
   std::unique_ptr<cmsys::ifstream> fin(new cmsys::ifstream(fname));
 
   // Quit now if the file could not be opened.
-  if (!fin.get() || !*fin) {
+  if (!fin || !*fin) {
     this->ErrorMessage = "Error opening input file.";
     return;
   }

Source/cmExportFileGenerator.cxx

@@ -79,7 +79,7 @@ bool cmExportFileGenerator::GenerateImportFile()
     ap->SetCopyIfDifferent(true);
     foutPtr = std::move(ap);
   }
-  if (!foutPtr.get() || !*foutPtr) {
+  if (!foutPtr || !*foutPtr) {
     std::string se = cmSystemTools::GetLastSystemError();
     std::ostringstream e;
     e << "cannot write to file \"" << this->MainImportFile << "\": " << se;

Source/cmFileCommand.cxx

@@ -2824,7 +2824,7 @@ bool cmFileCommand::HandleDownloadCommand(std::vector<std::string> const& args)
       std::string algo = i->substr(0, pos);
       expectedHash = cmSystemTools::LowerCase(i->substr(pos + 1));
       hash = std::unique_ptr<cmCryptoHash>(cmCryptoHash::New(algo.c_str()));
-      if (!hash.get()) {
+      if (!hash) {
         std::string err = "DOWNLOAD EXPECTED_HASH given unknown ALGO: ";
         err += algo;
         this->SetError(err);

Source/cmForEachCommand.cxx

@@ -38,7 +38,7 @@ bool cmForEachFunctionBlocker::IsFunctionBlocked(const cmListFileFunction& lff,
       // Remove the function blocker for this scope or bail.
       std::unique_ptr<cmFunctionBlocker> fb(
         mf.RemoveFunctionBlocker(this, lff));
-      if (!fb.get()) {
+      if (!fb) {
         return false;
       }
 

Source/cmGeneratorTarget.cxx

@@ -4379,8 +4379,7 @@ const char* impliedValue<const char*>(const char* /*unused*/)
   return "";
 }
 template <>
-std::string impliedValue<std::string>(
-  std::string /*unused*/) // NOLINT(clang-tidy)
+std::string impliedValue<std::string>(std::string /*unused*/) // NOLINT(*)
 {
   return std::string();
 }

Source/cmGlobalNinjaGenerator.cxx

@@ -112,7 +112,7 @@ std::string cmGlobalNinjaGenerator::EncodeLiteral(const std::string& lit)
 
 std::string cmGlobalNinjaGenerator::EncodePath(const std::string& path)
 {
-  std::string result = path; // NOLINT(clang-tidy)
+  std::string result = path;
 #ifdef _WIN32
   if (this->IsGCCOnWindows())
     std::replace(result.begin(), result.end(), '\\', '/');
@@ -254,7 +254,7 @@ void cmGlobalNinjaGenerator::WriteCustomCommandBuild(
   bool restat, const cmNinjaDeps& outputs, const cmNinjaDeps& deps,
   const cmNinjaDeps& orderOnly)
 {
-  std::string cmd = command; // NOLINT(clang-tidy)
+  std::string cmd = command; // NOLINT(*)
 #ifdef _WIN32
   if (cmd.empty())
     // TODO Shouldn't an empty command be handled by ninja?
@@ -1940,7 +1940,7 @@ int cmcmd_cmake_ninja_dyndep(std::vector<std::string>::const_iterator argBeg,
   cm.SetHomeOutputDirectory(dir_top_bld);
   std::unique_ptr<cmGlobalNinjaGenerator> ggd(
     static_cast<cmGlobalNinjaGenerator*>(cm.CreateGlobalGenerator("Ninja")));
-  if (!ggd.get() ||
+  if (!ggd ||
       !ggd->WriteDyndepFile(dir_top_src, dir_top_bld, dir_cur_src, dir_cur_bld,
                             arg_dd, arg_ddis, module_dir,
                             linked_target_dirs)) {

Source/cmIfCommand.cxx

@@ -39,7 +39,7 @@ bool cmIfFunctionBlocker::IsFunctionBlocked(const cmListFileFunction& lff,
       // Remove the function blocker for this scope or bail.
       std::unique_ptr<cmFunctionBlocker> fb(
         mf.RemoveFunctionBlocker(this, lff));
-      if (!fb.get()) {
+      if (!fb) {
         return false;
       }
 

Source/cmMakefile.cxx

@@ -2342,7 +2342,7 @@ cmMakefile::AppleSDK cmMakefile::GetAppleSDKType() const
     { "watchsimulator", AppleSDK::WatchSimulator },
   };
 
-  for (auto entry : sdkDatabase) {
+  for (auto const& entry : sdkDatabase) {
     if (sdkRoot.find(entry.name) == 0 ||
         sdkRoot.find(std::string("/") + entry.name) != std::string::npos) {
       return entry.sdk;

Source/cmWhileCommand.cxx

@@ -37,7 +37,7 @@ bool cmWhileFunctionBlocker::IsFunctionBlocked(const cmListFileFunction& lff,
       // Remove the function blocker for this scope or bail.
       std::unique_ptr<cmFunctionBlocker> fb(
         mf.RemoveFunctionBlocker(this, lff));
-      if (!fb.get()) {
+      if (!fb) {
         return false;
       }
 

Source/cmake.cxx

@@ -2596,7 +2596,7 @@ bool cmake::Open(const std::string& dir, bool dryRun)
 
   std::unique_ptr<cmGlobalGenerator> gen(
     this->CreateGlobalGenerator(fullName));
-  if (!gen.get()) {
+  if (!gen) {
     std::cerr << "Error: could create CMAKE_GENERATOR \"" << fullName
               << "\"\n";
     return false;