cmMakefile: Simplify detail:::Add{Custom,Utility}Command

Note 1: `detail::AddCustomCommandToTarget()` resets cc,
since cc is not moved away.

Note 2: In `detail::AddUtilityCommand()`, a few vars are preserved
before using. Their refs will be alive in most cases, but cc might
be destroyed in the future.

Source/cmLocalGenerator.cxx

@@ -1072,11 +1072,22 @@ cmTarget* cmLocalGenerator::AddCustomCommandToTarget(
     return nullptr;
   }
 
-  detail::AddCustomCommandToTarget(
+  auto cc = cm::make_unique<cmCustomCommand>();
-    *this, this->DirectoryBacktrace, cmCommandOrigin::Generator, t, byproducts,
+  cc->SetBacktrace(this->DirectoryBacktrace);
-    depends, commandLines, type, comment, workingDir, escapeOldStyle,
+  cc->SetByproducts(byproducts);
-    uses_terminal, depfile, job_pool, command_expand_lists, stdPipesUTF8,
+  cc->SetDepends(depends);
-    cmp0116);
+  cc->SetCommandLines(commandLines);
+  cc->SetComment(comment);
+  cc->SetWorkingDirectory(workingDir);
+  cc->SetEscapeOldStyle(escapeOldStyle);
+  cc->SetUsesTerminal(uses_terminal);
+  cc->SetDepfile(depfile);
+  cc->SetJobPool(job_pool);
+  cc->SetCommandExpandLists(command_expand_lists);
+  cc->SetStdPipesUTF8(stdPipesUTF8);
+  cc->SetCMP0116Status(cmp0116);
+  detail::AddCustomCommandToTarget(*this, cmCommandOrigin::Generator, t, type,
+                                   std::move(cc));
 
   return t;
 }
@@ -1113,11 +1124,25 @@ cmSourceFile* cmLocalGenerator::AddCustomCommandToOutput(
     return nullptr;
   }
 
-  return detail::AddCustomCommandToOutput(
+  auto cc = cm::make_unique<cmCustomCommand>();
-    *this, this->DirectoryBacktrace, cmCommandOrigin::Generator, outputs,
+  cc->SetBacktrace(this->DirectoryBacktrace);
-    byproducts, depends, main_dependency, implicit_depends, commandLines,
+  cc->SetOutputs(outputs);
-    comment, workingDir, replace, escapeOldStyle, uses_terminal,
+  cc->SetByproducts(byproducts);
-    command_expand_lists, depfile, job_pool, stdPipesUTF8, cmp0116);
+  cc->SetDepends(depends);
+  cc->SetImplicitDepends(implicit_depends);
+  cc->SetCommandLines(commandLines);
+  cc->SetComment(comment);
+  cc->SetWorkingDirectory(workingDir);
+  cc->SetEscapeOldStyle(escapeOldStyle);
+  cc->SetUsesTerminal(uses_terminal);
+  cc->SetCommandExpandLists(command_expand_lists);
+  cc->SetDepfile(depfile);
+  cc->SetJobPool(job_pool);
+  cc->SetStdPipesUTF8(stdPipesUTF8);
+  cc->SetCMP0116Status(cmp0116);
+  return detail::AddCustomCommandToOutput(*this, cmCommandOrigin::Generator,
+                                          main_dependency, std::move(cc),
+                                          replace);
 }
 
 cmTarget* cmLocalGenerator::AddUtilityCommand(
@@ -1136,10 +1161,21 @@ cmTarget* cmLocalGenerator::AddUtilityCommand(
     return target;
   }
 
-  detail::AddUtilityCommand(
+  auto cc = cm::make_unique<cmCustomCommand>();
-    *this, this->DirectoryBacktrace, cmCommandOrigin::Generator, target,
+  cc->SetBacktrace(this->DirectoryBacktrace);
-    workingDir, byproducts, depends, commandLines, escapeOldStyle, comment,
+  cc->SetWorkingDirectory(workingDir);
-    uses_terminal, command_expand_lists, job_pool, stdPipesUTF8, cmp0116);
+  cc->SetByproducts(byproducts);
+  cc->SetDepends(depends);
+  cc->SetCommandLines(commandLines);
+  cc->SetEscapeOldStyle(escapeOldStyle);
+  cc->SetComment(comment);
+  cc->SetUsesTerminal(uses_terminal);
+  cc->SetCommandExpandLists(command_expand_lists);
+  cc->SetJobPool(job_pool);
+  cc->SetStdPipesUTF8(stdPipesUTF8);
+  cc->SetCMP0116Status(cmp0116);
+  detail::AddUtilityCommand(*this, cmCommandOrigin::Generator, target,
+                            std::move(cc));
 
   return target;
 }
@@ -4051,19 +4087,16 @@ std::string ComputeCustomCommandRuleFileName(cmLocalGenerator& lg,
                   h.HashString(output).substr(0, 16));
 }
 
-cmSourceFile* AddCustomCommand(
+cmSourceFile* AddCustomCommand(cmLocalGenerator& lg, cmCommandOrigin origin,
-  cmLocalGenerator& lg, const cmListFileBacktrace& lfbt,
+                               const std::string& main_dependency,
-  cmCommandOrigin origin, const std::vector<std::string>& outputs,
+                               std::unique_ptr<cmCustomCommand> cc,
-  const std::vector<std::string>& byproducts,
+                               bool replace)
-  const std::vector<std::string>& depends, const std::string& main_dependency,
-  const cmImplicitDependsList& implicit_depends,
-  const cmCustomCommandLines& commandLines, const char* comment,
-  const char* workingDir, bool replace, bool escapeOldStyle,
-  bool uses_terminal, bool command_expand_lists, const std::string& depfile,
-  const std::string& job_pool, bool stdPipesUTF8,
-  cmPolicies::PolicyStatus cmp0116)
 {
   cmMakefile* mf = lg.GetMakefile();
+  const auto& lfbt = cc->GetBacktrace();
+  const auto& outputs = cc->GetOutputs();
+  const auto& byproducts = cc->GetByproducts();
+  const auto& commandLines = cc->GetCommandLines();
 
   // Choose a source file on which to store the custom command.
   cmSourceFile* file = nullptr;
@@ -4118,34 +4151,18 @@ cmSourceFile* AddCustomCommand(
   // Attach the custom command to the file.
   if (file) {
     // Construct a complete list of dependencies.
-    std::vector<std::string> depends2(depends);
     if (!main_dependency.empty()) {
-      depends2.push_back(main_dependency);
+      cc->AppendDepends({ main_dependency });
     }
 
-    std::unique_ptr<cmCustomCommand> cc = cm::make_unique<cmCustomCommand>();
-    cc->SetByproducts(byproducts);
-    cc->SetDepends(std::move(depends2));
-    cc->SetOutputs(outputs);
-    cc->SetCommandLines(commandLines);
-    cc->SetComment(comment);
-    cc->SetBacktrace(lfbt);
-    cc->SetWorkingDirectory(workingDir);
-    cc->SetStdPipesUTF8(stdPipesUTF8);
-    cc->SetEscapeOldStyle(escapeOldStyle);
     cc->SetEscapeAllowMakeVars(true);
-    cc->SetImplicitDepends(implicit_depends);
-    cc->SetUsesTerminal(uses_terminal);
-    cc->SetCommandExpandLists(command_expand_lists);
-    cc->SetDepfile(depfile);
-    cc->SetJobPool(job_pool);
-    cc->SetCMP0116Status(cmp0116);
-    file->SetCustomCommand(std::move(cc));
 
     lg.AddSourceOutputs(file, outputs, cmLocalGenerator::OutputRole::Primary,
                         lfbt, origin);
     lg.AddSourceOutputs(file, byproducts,
                         cmLocalGenerator::OutputRole::Byproduct, lfbt, origin);
+
+    file->SetCustomCommand(std::move(cc));
   }
   return file;
 }
@@ -4174,68 +4191,39 @@ bool AnyTargetCommandOutputMatches(
 }
 
 namespace detail {
-void AddCustomCommandToTarget(cmLocalGenerator& lg,
+void AddCustomCommandToTarget(cmLocalGenerator& lg, cmCommandOrigin origin,
-                              const cmListFileBacktrace& lfbt,
+                              cmTarget* target, cmCustomCommandType type,
-                              cmCommandOrigin origin, cmTarget* target,
+                              std::unique_ptr<cmCustomCommand> cc)
-                              const std::vector<std::string>& byproducts,
-                              const std::vector<std::string>& depends,
-                              const cmCustomCommandLines& commandLines,
-                              cmCustomCommandType type, const char* comment,
-                              const char* workingDir, bool escapeOldStyle,
-                              bool uses_terminal, const std::string& depfile,
-                              const std::string& job_pool,
-                              bool command_expand_lists, bool stdPipesUTF8,
-                              cmPolicies::PolicyStatus cmp0116)
 {
   // Add the command to the appropriate build step for the target.
-  cmCustomCommand cc;
+  cc->SetEscapeAllowMakeVars(true);
-  cc.SetByproducts(byproducts);
+  cc->SetTarget(target->GetName());
-  cc.SetDepends(depends);
+
-  cc.SetCommandLines(commandLines);
+  lg.AddTargetByproducts(target, cc->GetByproducts(), cc->GetBacktrace(),
-  cc.SetComment(comment);
+                         origin);
-  cc.SetBacktrace(lfbt);
+
-  cc.SetWorkingDirectory(workingDir);
-  cc.SetStdPipesUTF8(stdPipesUTF8);
-  cc.SetEscapeOldStyle(escapeOldStyle);
-  cc.SetEscapeAllowMakeVars(true);
-  cc.SetUsesTerminal(uses_terminal);
-  cc.SetCommandExpandLists(command_expand_lists);
-  cc.SetDepfile(depfile);
-  cc.SetJobPool(job_pool);
-  cc.SetCMP0116Status(cmp0116);
-  cc.SetTarget(target->GetName());
   switch (type) {
     case cmCustomCommandType::PRE_BUILD:
-      target->AddPreBuildCommand(std::move(cc));
+      target->AddPreBuildCommand(std::move(*cc));
       break;
     case cmCustomCommandType::PRE_LINK:
-      target->AddPreLinkCommand(std::move(cc));
+      target->AddPreLinkCommand(std::move(*cc));
       break;
     case cmCustomCommandType::POST_BUILD:
-      target->AddPostBuildCommand(std::move(cc));
+      target->AddPostBuildCommand(std::move(*cc));
       break;
   }
 
-  lg.AddTargetByproducts(target, byproducts, lfbt, origin);
+  cc.reset();
 }
 
-cmSourceFile* AddCustomCommandToOutput(
+cmSourceFile* AddCustomCommandToOutput(cmLocalGenerator& lg,
-  cmLocalGenerator& lg, const cmListFileBacktrace& lfbt,
+                                       cmCommandOrigin origin,
-  cmCommandOrigin origin, const std::vector<std::string>& outputs,
+                                       const std::string& main_dependency,
-  const std::vector<std::string>& byproducts,
+                                       std::unique_ptr<cmCustomCommand> cc,
-  const std::vector<std::string>& depends, const std::string& main_dependency,
+                                       bool replace)
-  const cmImplicitDependsList& implicit_depends,
-  const cmCustomCommandLines& commandLines, const char* comment,
-  const char* workingDir, bool replace, bool escapeOldStyle,
-  bool uses_terminal, bool command_expand_lists, const std::string& depfile,
-  const std::string& job_pool, bool stdPipesUTF8,
-  cmPolicies::PolicyStatus cmp0116)
 {
-  return AddCustomCommand(lg, lfbt, origin, outputs, byproducts, depends,
+  return AddCustomCommand(lg, origin, main_dependency, std::move(cc), replace);
-                          main_dependency, implicit_depends, commandLines,
-                          comment, workingDir, replace, escapeOldStyle,
-                          uses_terminal, command_expand_lists, depfile,
-                          job_pool, stdPipesUTF8, cmp0116);
 }
 
 void AppendCustomCommandToOutput(cmLocalGenerator& lg,
@@ -4278,33 +4266,27 @@ void AppendCustomCommandToOutput(cmLocalGenerator& lg,
     lfbt);
 }
 
-void AddUtilityCommand(cmLocalGenerator& lg, const cmListFileBacktrace& lfbt,
+void AddUtilityCommand(cmLocalGenerator& lg, cmCommandOrigin origin,
-                       cmCommandOrigin origin, cmTarget* target,
+                       cmTarget* target, std::unique_ptr<cmCustomCommand> cc)
-                       const char* workingDir,
-                       const std::vector<std::string>& byproducts,
-                       const std::vector<std::string>& depends,
-                       const cmCustomCommandLines& commandLines,
-                       bool escapeOldStyle, const char* comment,
-                       bool uses_terminal, bool command_expand_lists,
-                       const std::string& job_pool, bool stdPipesUTF8,
-                       cmPolicies::PolicyStatus cmp0116)
 {
+  // They might be moved away
+  auto byproducts = cc->GetByproducts();
+  auto lfbt = cc->GetBacktrace();
+
   // Use an empty comment to avoid generation of default comment.
-  if (!comment) {
+  if (!cc->GetComment()) {
-    comment = "";
+    cc->SetComment("");
   }
 
   // Create the generated symbolic output name of the utility target.
   std::string output =
     lg.CreateUtilityOutput(target->GetName(), byproducts, lfbt);
+  cc->SetOutputs(output);
 
   std::string no_main_dependency;
-  cmImplicitDependsList no_implicit_depends;
+  cmSourceFile* rule =
-  cmSourceFile* rule = AddCustomCommand(
+    AddCustomCommand(lg, origin, no_main_dependency, std::move(cc),
-    lg, lfbt, origin, { output }, byproducts, depends, no_main_dependency,
+                     /*replace=*/false);
-    no_implicit_depends, commandLines, comment, workingDir,
-    /*replace=*/false, escapeOldStyle, uses_terminal, command_expand_lists,
-    /*depfile=*/"", job_pool, stdPipesUTF8, cmp0116);
   if (rule) {
     lg.AddTargetByproducts(target, byproducts, lfbt, origin);
   }

Source/cmLocalGenerator.h

@@ -713,30 +713,15 @@ bool cmLocalGeneratorCheckObjectName(std::string& objName,
 #endif
 
 namespace detail {
-void AddCustomCommandToTarget(cmLocalGenerator& lg,
+void AddCustomCommandToTarget(cmLocalGenerator& lg, cmCommandOrigin origin,
-                              const cmListFileBacktrace& lfbt,
+                              cmTarget* target, cmCustomCommandType type,
-                              cmCommandOrigin origin, cmTarget* target,
+                              std::unique_ptr<cmCustomCommand> cc);
-                              const std::vector<std::string>& byproducts,
-                              const std::vector<std::string>& depends,
-                              const cmCustomCommandLines& commandLines,
-                              cmCustomCommandType type, const char* comment,
-                              const char* workingDir, bool escapeOldStyle,
-                              bool uses_terminal, const std::string& depfile,
-                              const std::string& job_pool,
-                              bool command_expand_lists, bool stdPipesUTF8,
-                              cmPolicies::PolicyStatus cmp0116);
 
-cmSourceFile* AddCustomCommandToOutput(
+cmSourceFile* AddCustomCommandToOutput(cmLocalGenerator& lg,
-  cmLocalGenerator& lg, const cmListFileBacktrace& lfbt,
+                                       cmCommandOrigin origin,
-  cmCommandOrigin origin, const std::vector<std::string>& outputs,
+                                       const std::string& main_dependency,
-  const std::vector<std::string>& byproducts,
+                                       std::unique_ptr<cmCustomCommand> cc,
-  const std::vector<std::string>& depends, const std::string& main_dependency,
+                                       bool replace);
-  const cmImplicitDependsList& implicit_depends,
-  const cmCustomCommandLines& commandLines, const char* comment,
-  const char* workingDir, bool replace, bool escapeOldStyle,
-  bool uses_terminal, bool command_expand_lists, const std::string& depfile,
-  const std::string& job_pool, bool stdPipesUTF8,
-  cmPolicies::PolicyStatus cmp0116);
 
 void AppendCustomCommandToOutput(cmLocalGenerator& lg,
                                  const cmListFileBacktrace& lfbt,
@@ -745,16 +730,8 @@ void AppendCustomCommandToOutput(cmLocalGenerator& lg,
                                  const cmImplicitDependsList& implicit_depends,
                                  const cmCustomCommandLines& commandLines);
 
-void AddUtilityCommand(cmLocalGenerator& lg, const cmListFileBacktrace& lfbt,
+void AddUtilityCommand(cmLocalGenerator& lg, cmCommandOrigin origin,
-                       cmCommandOrigin origin, cmTarget* target,
+                       cmTarget* target, std::unique_ptr<cmCustomCommand> cc);
-                       const char* workingDir,
-                       const std::vector<std::string>& byproducts,
-                       const std::vector<std::string>& depends,
-                       const cmCustomCommandLines& commandLines,
-                       bool escapeOldStyle, const char* comment,
-                       bool uses_terminal, bool command_expand_lists,
-                       const std::string& job_pool, bool stdPipesUTF8,
-                       cmPolicies::PolicyStatus cmp0116);
 
 std::vector<std::string> ComputeISPCObjectSuffixes(cmGeneratorTarget* target);
 std::vector<std::string> ComputeISPCExtraObjects(

Source/cmMakefile.cxx

@@ -900,7 +900,12 @@ void cmMakefile::AddGeneratorAction(GeneratorAction&& action)
 void cmMakefile::GeneratorAction::operator()(cmLocalGenerator& lg,
                                              const cmListFileBacktrace& lfbt)
 {
-  Action(lg, lfbt);
+  if (cc) {
+    CCAction(lg, lfbt, std::move(cc));
+  } else {
+    assert(Action);
+    Action(lg, lfbt);
+  }
 }
 
 void cmMakefile::DoGenerate(cmLocalGenerator& lg)
@@ -962,19 +967,6 @@ private:
   cmListFileBacktrace& Backtrace;
   cmListFileBacktrace Previous;
 };
-
-cm::optional<std::string> MakeOptionalString(const char* str)
-{
-  if (str) {
-    return str;
-  }
-  return cm::nullopt;
-}
-
-const char* GetCStrOrNull(const cm::optional<std::string>& str)
-{
-  return str ? str->c_str() : nullptr;
-}
 }
 
 bool cmMakefile::ValidateCustomCommand(
@@ -1082,19 +1074,29 @@ cmTarget* cmMakefile::AddCustomCommandToTarget(
 
   auto cmp0116 = this->GetPolicyStatus(cmPolicies::CMP0116);
 
-  // Strings could be moved into the callback function with C++14.
+  auto cc = cm::make_unique<cmCustomCommand>();
-  cm::optional<std::string> commentStr = MakeOptionalString(comment);
+  cc->SetByproducts(byproducts);
-  cm::optional<std::string> workingStr = MakeOptionalString(workingDir);
+  cc->SetDepends(depends);
+  cc->SetCommandLines(commandLines);
+  cc->SetComment(comment);
+  cc->SetWorkingDirectory(workingDir);
+  cc->SetEscapeOldStyle(escapeOldStyle);
+  cc->SetUsesTerminal(uses_terminal);
+  cc->SetDepfile(depfile);
+  cc->SetJobPool(job_pool);
+  cc->SetCommandExpandLists(command_expand_lists);
+  cc->SetStdPipesUTF8(stdPipesUTF8);
+  cc->SetCMP0116Status(cmp0116);
 
   // Dispatch command creation to allow generator expressions in outputs.
   this->AddGeneratorAction(
-    [=](cmLocalGenerator& lg, const cmListFileBacktrace& lfbt) {
+    std::move(cc),
+    [=](cmLocalGenerator& lg, const cmListFileBacktrace& lfbt,
+        std::unique_ptr<cmCustomCommand> tcc) {
       BacktraceGuard guard(this->Backtrace, lfbt);
-      detail::AddCustomCommandToTarget(
+      tcc->SetBacktrace(lfbt);
-        lg, lfbt, cmCommandOrigin::Project, t, byproducts, depends,
+      detail::AddCustomCommandToTarget(lg, cmCommandOrigin::Project, t, type,
-        commandLines, type, GetCStrOrNull(commentStr),
+                                       std::move(tcc));
-        GetCStrOrNull(workingStr), escapeOldStyle, uses_terminal, depfile,
-        job_pool, command_expand_lists, stdPipesUTF8, cmp0116);
     });
 
   return t;
@@ -1143,20 +1145,32 @@ void cmMakefile::AddCustomCommandToOutput(
 
   auto cmp0116 = this->GetPolicyStatus(cmPolicies::CMP0116);
 
-  // Strings could be moved into the callback function with C++14.
+  auto cc = cm::make_unique<cmCustomCommand>();
-  cm::optional<std::string> commentStr = MakeOptionalString(comment);
+  cc->SetOutputs(outputs);
-  cm::optional<std::string> workingStr = MakeOptionalString(workingDir);
+  cc->SetByproducts(byproducts);
+  cc->SetDepends(depends);
+  cc->SetImplicitDepends(implicit_depends);
+  cc->SetCommandLines(commandLines);
+  cc->SetComment(comment);
+  cc->SetWorkingDirectory(workingDir);
+  cc->SetEscapeOldStyle(escapeOldStyle);
+  cc->SetUsesTerminal(uses_terminal);
+  cc->SetCommandExpandLists(command_expand_lists);
+  cc->SetDepfile(depfile);
+  cc->SetJobPool(job_pool);
+  cc->SetStdPipesUTF8(stdPipesUTF8);
+  cc->SetCMP0116Status(cmp0116);
 
   // Dispatch command creation to allow generator expressions in outputs.
   this->AddGeneratorAction(
-    [=](cmLocalGenerator& lg, const cmListFileBacktrace& lfbt) {
+    std::move(cc),
+    [=](cmLocalGenerator& lg, const cmListFileBacktrace& lfbt,
+        std::unique_ptr<cmCustomCommand> tcc) {
       BacktraceGuard guard(this->Backtrace, lfbt);
+      tcc->SetBacktrace(lfbt);
       cmSourceFile* sf = detail::AddCustomCommandToOutput(
-        lg, lfbt, cmCommandOrigin::Project, outputs, byproducts, depends,
+        lg, cmCommandOrigin::Project, main_dependency, std::move(tcc),
-        main_dependency, implicit_depends, commandLines,
+        replace);
-        GetCStrOrNull(commentStr), GetCStrOrNull(workingStr), replace,
-        escapeOldStyle, uses_terminal, command_expand_lists, depfile, job_pool,
-        stdPipesUTF8, cmp0116);
       if (callback && sf) {
         callback(sf);
       }
@@ -1264,19 +1278,28 @@ cmTarget* cmMakefile::AddUtilityCommand(
 
   auto cmp0116 = this->GetPolicyStatus(cmPolicies::CMP0116);
 
-  // Strings could be moved into the callback function with C++14.
+  auto cc = cm::make_unique<cmCustomCommand>();
-  cm::optional<std::string> commentStr = MakeOptionalString(comment);
+  cc->SetWorkingDirectory(workingDir);
-  cm::optional<std::string> workingStr = MakeOptionalString(workingDir);
+  cc->SetByproducts(byproducts);
+  cc->SetDepends(depends);
+  cc->SetCommandLines(commandLines);
+  cc->SetEscapeOldStyle(escapeOldStyle);
+  cc->SetComment(comment);
+  cc->SetUsesTerminal(uses_terminal);
+  cc->SetCommandExpandLists(command_expand_lists);
+  cc->SetJobPool(job_pool);
+  cc->SetStdPipesUTF8(stdPipesUTF8);
+  cc->SetCMP0116Status(cmp0116);
 
   // Dispatch command creation to allow generator expressions in outputs.
   this->AddGeneratorAction(
-    [=](cmLocalGenerator& lg, const cmListFileBacktrace& lfbt) {
+    std::move(cc),
+    [=](cmLocalGenerator& lg, const cmListFileBacktrace& lfbt,
+        std::unique_ptr<cmCustomCommand> tcc) {
       BacktraceGuard guard(this->Backtrace, lfbt);
-      detail::AddUtilityCommand(
+      tcc->SetBacktrace(lfbt);
-        lg, lfbt, cmCommandOrigin::Project, target, GetCStrOrNull(workingStr),
+      detail::AddUtilityCommand(lg, cmCommandOrigin::Project, target,
-        byproducts, depends, commandLines, escapeOldStyle,
+                                std::move(tcc));
-        GetCStrOrNull(commentStr), uses_terminal, command_expand_lists,
-        job_pool, stdPipesUTF8, cmp0116);
     });
 
   return target;

Source/cmMakefile.h

@@ -24,6 +24,7 @@
 #include "cm_sys_stat.h"
 
 #include "cmAlgorithms.h"
+#include "cmCustomCommand.h"
 #include "cmCustomCommandTypes.h"
 #include "cmListFileCache.h"
 #include "cmMessageType.h"
@@ -50,7 +51,6 @@ class cmExportBuildFileGenerator;
 class cmFunctionBlocker;
 class cmGeneratorExpressionEvaluationFile;
 class cmGlobalGenerator;
-class cmImplicitDependsList;
 class cmInstallGenerator;
 class cmLocalGenerator;
 class cmMessenger;
@@ -144,6 +144,9 @@ public:
   {
     using ActionT =
       std::function<void(cmLocalGenerator&, const cmListFileBacktrace&)>;
+    using CCActionT =
+      std::function<void(cmLocalGenerator&, const cmListFileBacktrace&,
+                         std::unique_ptr<cmCustomCommand> cc)>;
 
   public:
     GeneratorAction(ActionT&& action)
@@ -151,10 +154,20 @@ public:
     {
     }
 
+    GeneratorAction(std::unique_ptr<cmCustomCommand> tcc, CCActionT&& action)
+      : CCAction(std::move(action))
+      , cc(std::move(tcc))
+    {
+    }
+
     void operator()(cmLocalGenerator& lg, const cmListFileBacktrace& lfbt);
 
   private:
     ActionT Action;
+
+    // FIXME: Use std::variant
+    CCActionT CCAction;
+    std::unique_ptr<cmCustomCommand> cc;
   };
 
   /**