cmTarget*: Port away from cmCommand

19 files changed, 368 insertions, 502 deletions

diff --git a/Source/cmCommands.cxx b/Source/cmCommands.cxx
index 88d17f11ba..b1f7db7435 100644
--- a/Source/cmCommands.cxx
+++ b/Source/cmCommands.cxx
@@ -246,26 +246,22 @@ void GetProjectCommands(cmState* state)
   state->AddBuiltinCommand("set_tests_properties",
                            cmSetTestsPropertiesCommand);
   state->AddBuiltinCommand("subdirs", cmSubdirCommand);
-  state->AddBuiltinCommand(
-    "target_compile_definitions",
-    cm::make_unique<cmTargetCompileDefinitionsCommand>());
+  state->AddBuiltinCommand("target_compile_definitions",
+                           cmTargetCompileDefinitionsCommand);
   state->AddBuiltinCommand("target_compile_features",
-                           cm::make_unique<cmTargetCompileFeaturesCommand>());
+                           cmTargetCompileFeaturesCommand);
   state->AddBuiltinCommand("target_compile_options",
-                           cm::make_unique<cmTargetCompileOptionsCommand>());
-  state->AddBuiltinCommand(
-    "target_include_directories",
-    cm::make_unique<cmTargetIncludeDirectoriesCommand>());
+                           cmTargetCompileOptionsCommand);
+  state->AddBuiltinCommand("target_include_directories",
+                           cmTargetIncludeDirectoriesCommand);
   state->AddBuiltinCommand("target_link_libraries",
                            cmTargetLinkLibrariesCommand);
-  state->AddBuiltinCommand("target_sources",
-                           cm::make_unique<cmTargetSourcesCommand>());
+  state->AddBuiltinCommand("target_sources", cmTargetSourcesCommand);
   state->AddBuiltinCommand("try_compile",
                            cm::make_unique<cmTryCompileCommand>());
   state->AddBuiltinCommand("try_run", cm::make_unique<cmTryRunCommand>());
-  state->AddBuiltinCommand(
-    "target_precompile_headers",
-    cm::make_unique<cmTargetPrecompileHeadersCommand>());
+  state->AddBuiltinCommand("target_precompile_headers",
+                           cmTargetPrecompileHeadersCommand);
 
 #if !defined(CMAKE_BOOTSTRAP)
   state->AddBuiltinCommand("add_compile_definitions",
@@ -280,10 +276,9 @@ void GetProjectCommands(cmState* state)
   state->AddBuiltinCommand("install_programs", cmInstallProgramsCommand);
   state->AddBuiltinCommand("add_link_options", cmAddLinkOptionsCommand);
   state->AddBuiltinCommand("link_libraries", cmLinkLibrariesCommand);
-  state->AddBuiltinCommand("target_link_options",
-                           cm::make_unique<cmTargetLinkOptionsCommand>());
+  state->AddBuiltinCommand("target_link_options", cmTargetLinkOptionsCommand);
   state->AddBuiltinCommand("target_link_directories",
-                           cm::make_unique<cmTargetLinkDirectoriesCommand>());
+                           cmTargetLinkDirectoriesCommand);
   state->AddBuiltinCommand("load_cache", cmLoadCacheCommand);
   state->AddBuiltinCommand("qt_wrap_cpp", cmQTWrapCPPCommand);
   state->AddBuiltinCommand("qt_wrap_ui", cmQTWrapUICommand);
diff --git a/Source/cmTargetCompileDefinitionsCommand.cxx b/Source/cmTargetCompileDefinitionsCommand.cxx
index 94e249f22b..edee167004 100644
--- a/Source/cmTargetCompileDefinitionsCommand.cxx
+++ b/Source/cmTargetCompileDefinitionsCommand.cxx
@@ -6,43 +6,53 @@
 #include "cmMessageType.h"
 #include "cmStringAlgorithms.h"
 #include "cmTarget.h"
+#include "cmTargetPropCommandBase.h"
 
-class cmExecutionStatus;
+namespace {
 
-bool cmTargetCompileDefinitionsCommand::InitialPass(
-  std::vector<std::string> const& args, cmExecutionStatus&)
+class TargetCompileDefinitionsImpl : public cmTargetPropCommandBase
 {
-  return this->HandleArguments(args, "COMPILE_DEFINITIONS");
-}
+public:
+  using cmTargetPropCommandBase::cmTargetPropCommandBase;
 
-void cmTargetCompileDefinitionsCommand::HandleMissingTarget(
-  const std::string& name)
-{
-  this->Makefile->IssueMessage(
-    MessageType::FATAL_ERROR,
-    cmStrCat("Cannot specify compile definitions for target \"", name,
-             "\" which is not built by this project."));
-}
+private:
+  void HandleMissingTarget(const std::string& name) override
+  {
+    this->Makefile->IssueMessage(
+      MessageType::FATAL_ERROR,
+      cmStrCat("Cannot specify compile definitions for target \"", name,
+               "\" which is not built by this project."));
+  }
 
-std::string cmTargetCompileDefinitionsCommand::Join(
-  const std::vector<std::string>& content)
-{
-  std::string defs;
-  std::string sep;
-  for (std::string const& it : content) {
-    if (cmHasLiteralPrefix(it, "-D")) {
-      defs += sep + it.substr(2);
-    } else {
-      defs += sep + it;
+  bool HandleDirectContent(cmTarget* tgt,
+                           const std::vector<std::string>& content,
+                           bool /*prepend*/, bool /*system*/) override
+  {
+    tgt->AppendProperty("COMPILE_DEFINITIONS", this->Join(content).c_str());
+    return true; // Successfully handled.
+  }
+
+  std::string Join(const std::vector<std::string>& content) override
+  {
+    std::string defs;
+    std::string sep;
+    for (std::string const& it : content) {
+      if (cmHasLiteralPrefix(it, "-D")) {
+        defs += sep + it.substr(2);
+      } else {
+        defs += sep + it;
+      }
+      sep = ";";
     }
-    sep = ";";
+    return defs;
   }
-  return defs;
-}
+};
+
+} // namespace
 
-bool cmTargetCompileDefinitionsCommand::HandleDirectContent(
-  cmTarget* tgt, const std::vector<std::string>& content, bool, bool)
+bool cmTargetCompileDefinitionsCommand(std::vector<std::string> const& args,
+                                       cmExecutionStatus& status)
 {
-  tgt->AppendProperty("COMPILE_DEFINITIONS", this->Join(content).c_str());
-  return true; // Successfully handled.
+  return TargetCompileDefinitionsImpl(status).HandleArguments(
+    args, "COMPILE_DEFINITIONS");
 }
diff --git a/Source/cmTargetCompileDefinitionsCommand.h b/Source/cmTargetCompileDefinitionsCommand.h
index f85dc0a9c5..05ff092e87 100644
--- a/Source/cmTargetCompileDefinitionsCommand.h
+++ b/Source/cmTargetCompileDefinitionsCommand.h
@@ -8,39 +8,9 @@
 #include <string>
 #include <vector>
 
-#include <cm/memory>
-
-#include "cmCommand.h"
-#include "cmTargetPropCommandBase.h"
-
 class cmExecutionStatus;
-class cmTarget;
-
-class cmTargetCompileDefinitionsCommand : public cmTargetPropCommandBase
-{
-public:
-  /**
-   * This is a virtual constructor for the command.
-   */
-  std::unique_ptr<cmCommand> Clone() override
-  {
-    return cm::make_unique<cmTargetCompileDefinitionsCommand>();
-  }
-
-  /**
-   * This is called when the command is first encountered in
-   * the CMakeLists.txt file.
-   */
-  bool InitialPass(std::vector<std::string> const& args,
-                   cmExecutionStatus& status) override;
-
-private:
-  void HandleMissingTarget(const std::string& name) override;
 
-  bool HandleDirectContent(cmTarget* tgt,
-                           const std::vector<std::string>& content,
-                           bool prepend, bool system) override;
-  std::string Join(const std::vector<std::string>& content) override;
-};
+bool cmTargetCompileDefinitionsCommand(std::vector<std::string> const& args,
+                                       cmExecutionStatus& status);
 
 #endif
diff --git a/Source/cmTargetCompileFeaturesCommand.cxx b/Source/cmTargetCompileFeaturesCommand.cxx
index a22b94b100..06be4f0ddd 100644
--- a/Source/cmTargetCompileFeaturesCommand.cxx
+++ b/Source/cmTargetCompileFeaturesCommand.cxx
@@ -5,40 +5,51 @@
 #include "cmMakefile.h"
 #include "cmMessageType.h"
 #include "cmStringAlgorithms.h"
+#include "cmTargetPropCommandBase.h"
 
-class cmExecutionStatus;
 class cmTarget;
 
-bool cmTargetCompileFeaturesCommand::InitialPass(
-  std::vector<std::string> const& args, cmExecutionStatus&)
-{
-  return this->HandleArguments(args, "COMPILE_FEATURES", NO_FLAGS);
-}
+namespace {
 
-void cmTargetCompileFeaturesCommand::HandleMissingTarget(
-  const std::string& name)
+class TargetCompileFeaturesImpl : public cmTargetPropCommandBase
 {
-  this->Makefile->IssueMessage(
-    MessageType::FATAL_ERROR,
-    cmStrCat("Cannot specify compile features for target \"", name,
-             "\" which is not built by this project."));
-}
+public:
+  using cmTargetPropCommandBase::cmTargetPropCommandBase;
 
-std::string cmTargetCompileFeaturesCommand::Join(
-  const std::vector<std::string>& content)
-{
-  return cmJoin(content, ";");
-}
+private:
+  void HandleMissingTarget(const std::string& name) override
+  {
+    this->Makefile->IssueMessage(
+      MessageType::FATAL_ERROR,
+      cmStrCat("Cannot specify compile features for target \"", name,
+               "\" which is not built by this project."));
+  }
 
-bool cmTargetCompileFeaturesCommand::HandleDirectContent(
-  cmTarget* tgt, const std::vector<std::string>& content, bool, bool)
-{
-  for (std::string const& it : content) {
-    std::string error;
-    if (!this->Makefile->AddRequiredTargetFeature(tgt, it, &error)) {
-      this->SetError(error);
-      return false; // Not (successfully) handled.
+  bool HandleDirectContent(cmTarget* tgt,
+                           const std::vector<std::string>& content,
+                           bool /*prepend*/, bool /*system*/) override
+  {
+    for (std::string const& it : content) {
+      std::string error;
+      if (!this->Makefile->AddRequiredTargetFeature(tgt, it, &error)) {
+        this->SetError(error);
+        return false; // Not (successfully) handled.
+      }
     }
+    return true; // Successfully handled.
+  }
+
+  std::string Join(const std::vector<std::string>& content) override
+  {
+    return cmJoin(content, ";");
   }
-  return true; // Successfully handled.
+};
+
+} // namespace
+
+bool cmTargetCompileFeaturesCommand(std::vector<std::string> const& args,
+                                    cmExecutionStatus& status)
+{
+  return TargetCompileFeaturesImpl(status).HandleArguments(args,
+                                                           "COMPILE_FEATURES");
 }
diff --git a/Source/cmTargetCompileFeaturesCommand.h b/Source/cmTargetCompileFeaturesCommand.h
index 39597ca22f..db0c04b7e5 100644
--- a/Source/cmTargetCompileFeaturesCommand.h
+++ b/Source/cmTargetCompileFeaturesCommand.h
@@ -8,31 +8,9 @@
 #include <string>
 #include <vector>
 
-#include <cm/memory>
-
-#include "cmCommand.h"
-#include "cmTargetPropCommandBase.h"
-
 class cmExecutionStatus;
-class cmTarget;
-
-class cmTargetCompileFeaturesCommand : public cmTargetPropCommandBase
-{
-  std::unique_ptr<cmCommand> Clone() override
-  {
-    return cm::make_unique<cmTargetCompileFeaturesCommand>();
-  }
-
-  bool InitialPass(std::vector<std::string> const& args,
-                   cmExecutionStatus& status) override;
-
-private:
-  void HandleMissingTarget(const std::string& name) override;
 
-  bool HandleDirectContent(cmTarget* tgt,
-                           const std::vector<std::string>& content,
-                           bool prepend, bool system) override;
-  std::string Join(const std::vector<std::string>& content) override;
-};
+bool cmTargetCompileFeaturesCommand(std::vector<std::string> const& args,
+                                    cmExecutionStatus& status);
 
 #endif
diff --git a/Source/cmTargetCompileOptionsCommand.cxx b/Source/cmTargetCompileOptionsCommand.cxx
index ccc215ab6e..e39b726705 100644
--- a/Source/cmTargetCompileOptionsCommand.cxx
+++ b/Source/cmTargetCompileOptionsCommand.cxx
@@ -7,34 +7,44 @@
 #include "cmMessageType.h"
 #include "cmStringAlgorithms.h"
 #include "cmTarget.h"
+#include "cmTargetPropCommandBase.h"
 
-class cmExecutionStatus;
+namespace {
 
-bool cmTargetCompileOptionsCommand::InitialPass(
-  std::vector<std::string> const& args, cmExecutionStatus&)
+class TargetCompileOptionsImpl : public cmTargetPropCommandBase
 {
-  return this->HandleArguments(args, "COMPILE_OPTIONS", PROCESS_BEFORE);
-}
+public:
+  using cmTargetPropCommandBase::cmTargetPropCommandBase;
 
-void cmTargetCompileOptionsCommand::HandleMissingTarget(
-  const std::string& name)
-{
-  this->Makefile->IssueMessage(
-    MessageType::FATAL_ERROR,
-    cmStrCat("Cannot specify compile options for target \"", name,
-             "\" which is not built by this project."));
-}
+private:
+  void HandleMissingTarget(const std::string& name) override
+  {
+    this->Makefile->IssueMessage(
+      MessageType::FATAL_ERROR,
+      cmStrCat("Cannot specify compile options for target \"", name,
+               "\" which is not built by this project."));
+  }
 
-std::string cmTargetCompileOptionsCommand::Join(
-  const std::vector<std::string>& content)
-{
-  return cmJoin(content, ";");
-}
+  bool HandleDirectContent(cmTarget* tgt,
+                           const std::vector<std::string>& content,
+                           bool /*prepend*/, bool /*system*/) override
+  {
+    cmListFileBacktrace lfbt = this->Makefile->GetBacktrace();
+    tgt->InsertCompileOption(this->Join(content), lfbt);
+    return true; // Successfully handled.
+  }
+
+  std::string Join(const std::vector<std::string>& content) override
+  {
+    return cmJoin(content, ";");
+  }
+};
+
+} // namespace
 
-bool cmTargetCompileOptionsCommand::HandleDirectContent(
-  cmTarget* tgt, const std::vector<std::string>& content, bool, bool)
+bool cmTargetCompileOptionsCommand(std::vector<std::string> const& args,
+                                   cmExecutionStatus& status)
 {
-  cmListFileBacktrace lfbt = this->Makefile->GetBacktrace();
-  tgt->InsertCompileOption(this->Join(content), lfbt);
-  return true; // Successfully handled.
+  return TargetCompileOptionsImpl(status).HandleArguments(
+    args, "COMPILE_OPTIONS", TargetCompileOptionsImpl::PROCESS_BEFORE);
 }
diff --git a/Source/cmTargetCompileOptionsCommand.h b/Source/cmTargetCompileOptionsCommand.h
index b328ba2f09..3ab1a89c56 100644
--- a/Source/cmTargetCompileOptionsCommand.h
+++ b/Source/cmTargetCompileOptionsCommand.h
@@ -8,39 +8,9 @@
 #include <string>
 #include <vector>
 
-#include <cm/memory>
-
-#include "cmCommand.h"
-#include "cmTargetPropCommandBase.h"
-
 class cmExecutionStatus;
-class cmTarget;
-
-class cmTargetCompileOptionsCommand : public cmTargetPropCommandBase
-{
-public:
-  /**
-   * This is a virtual constructor for the command.
-   */
-  std::unique_ptr<cmCommand> Clone() override
-  {
-    return cm::make_unique<cmTargetCompileOptionsCommand>();
-  }
-
-  /**
-   * This is called when the command is first encountered in
-   * the CMakeLists.txt file.
-   */
-  bool InitialPass(std::vector<std::string> const& args,
-                   cmExecutionStatus& status) override;
-
-private:
-  void HandleMissingTarget(const std::string& name) override;
 
-  bool HandleDirectContent(cmTarget* tgt,
-                           const std::vector<std::string>& content,
-                           bool prepend, bool system) override;
-  std::string Join(const std::vector<std::string>& content) override;
-};
+bool cmTargetCompileOptionsCommand(std::vector<std::string> const& args,
+                                   cmExecutionStatus& status);
 
 #endif
diff --git a/Source/cmTargetIncludeDirectoriesCommand.cxx b/Source/cmTargetIncludeDirectoriesCommand.cxx
index 7801ee8c3e..95b69f3998 100644
--- a/Source/cmTargetIncludeDirectoriesCommand.cxx
+++ b/Source/cmTargetIncludeDirectoriesCommand.cxx
@@ -11,26 +11,36 @@
 #include "cmStringAlgorithms.h"
 #include "cmSystemTools.h"
 #include "cmTarget.h"
+#include "cmTargetPropCommandBase.h"
 
-class cmExecutionStatus;
+namespace {
 
-bool cmTargetIncludeDirectoriesCommand::InitialPass(
-  std::vector<std::string> const& args, cmExecutionStatus&)
+class TargetIncludeDirectoriesImpl : public cmTargetPropCommandBase
 {
-  return this->HandleArguments(args, "INCLUDE_DIRECTORIES",
-                               ArgumentFlags(PROCESS_BEFORE | PROCESS_SYSTEM));
-}
+public:
+  using cmTargetPropCommandBase::cmTargetPropCommandBase;
 
-void cmTargetIncludeDirectoriesCommand::HandleMissingTarget(
-  const std::string& name)
-{
-  this->Makefile->IssueMessage(
-    MessageType::FATAL_ERROR,
-    cmStrCat("Cannot specify include directories for target \"", name,
-             "\" which is not built by this project."));
-}
+private:
+  void HandleMissingTarget(const std::string& name) override
+  {
+    this->Makefile->IssueMessage(
+      MessageType::FATAL_ERROR,
+      cmStrCat("Cannot specify include directories for target \"", name,
+               "\" which is not built by this project."));
+  }
+
+  bool HandleDirectContent(cmTarget* tgt,
+                           const std::vector<std::string>& content,
+                           bool prepend, bool system) override;
+
+  void HandleInterfaceContent(cmTarget* tgt,
+                              const std::vector<std::string>& content,
+                              bool prepend, bool system) override;
 
-std::string cmTargetIncludeDirectoriesCommand::Join(
+  std::string Join(const std::vector<std::string>& content) override;
+};
+
+std::string TargetIncludeDirectoriesImpl::Join(
   const std::vector<std::string>& content)
 {
   std::string dirs;
@@ -48,7 +58,7 @@ std::string cmTargetIncludeDirectoriesCommand::Join(
   return dirs;
 }
 
-bool cmTargetIncludeDirectoriesCommand::HandleDirectContent(
+bool TargetIncludeDirectoriesImpl::HandleDirectContent(
   cmTarget* tgt, const std::vector<std::string>& content, bool prepend,
   bool system)
 {
@@ -70,16 +80,27 @@ bool cmTargetIncludeDirectoriesCommand::HandleDirectContent(
   return true; // Successfully handled.
 }
 
-void cmTargetIncludeDirectoriesCommand::HandleInterfaceContent(
+void TargetIncludeDirectoriesImpl::HandleInterfaceContent(
   cmTarget* tgt, const std::vector<std::string>& content, bool prepend,
   bool system)
 {
   cmTargetPropCommandBase::HandleInterfaceContent(tgt, content, prepend,
                                                   system);
-
   if (system) {
     std::string joined = this->Join(content);
     tgt->AppendProperty("INTERFACE_SYSTEM_INCLUDE_DIRECTORIES",
                         joined.c_str());
   }
 }
+
+} // namespace
+
+bool cmTargetIncludeDirectoriesCommand(std::vector<std::string> const& args,
+                                       cmExecutionStatus& status)
+{
+  return TargetIncludeDirectoriesImpl(status).HandleArguments(
+    args, "INCLUDE_DIRECTORIES",
+    TargetIncludeDirectoriesImpl::ArgumentFlags(
+      TargetIncludeDirectoriesImpl::PROCESS_BEFORE |
+      TargetIncludeDirectoriesImpl::PROCESS_SYSTEM));
+}
diff --git a/Source/cmTargetIncludeDirectoriesCommand.h b/Source/cmTargetIncludeDirectoriesCommand.h
index f6481dbf12..9958f419a3 100644
--- a/Source/cmTargetIncludeDirectoriesCommand.h
+++ b/Source/cmTargetIncludeDirectoriesCommand.h
@@ -8,43 +8,9 @@
 #include <string>
 #include <vector>
 
-#include <cm/memory>
-
-#include "cmCommand.h"
-#include "cmTargetPropCommandBase.h"
-
 class cmExecutionStatus;
-class cmTarget;
-
-class cmTargetIncludeDirectoriesCommand : public cmTargetPropCommandBase
-{
-public:
-  /**
-   * This is a virtual constructor for the command.
-   */
-  std::unique_ptr<cmCommand> Clone() override
-  {
-    return cm::make_unique<cmTargetIncludeDirectoriesCommand>();
-  }
-
-  /**
-   * This is called when the command is first encountered in
-   * the CMakeLists.txt file.
-   */
-  bool InitialPass(std::vector<std::string> const& args,
-                   cmExecutionStatus& status) override;
-
-private:
-  void HandleMissingTarget(const std::string& name) override;
-
-  bool HandleDirectContent(cmTarget* tgt,
-                           const std::vector<std::string>& content,
-                           bool prepend, bool system) override;
-  void HandleInterfaceContent(cmTarget* tgt,
-                              const std::vector<std::string>& content,
-                              bool prepend, bool system) override;
 
-  std::string Join(const std::vector<std::string>& content) override;
-};
+bool cmTargetIncludeDirectoriesCommand(std::vector<std::string> const& args,
+                                       cmExecutionStatus& status);
 
 #endif
diff --git a/Source/cmTargetLinkDirectoriesCommand.cxx b/Source/cmTargetLinkDirectoriesCommand.cxx
index c2ef6c1340..0c68d604c8 100644
--- a/Source/cmTargetLinkDirectoriesCommand.cxx
+++ b/Source/cmTargetLinkDirectoriesCommand.cxx
@@ -9,25 +9,37 @@
 #include "cmStringAlgorithms.h"
 #include "cmSystemTools.h"
 #include "cmTarget.h"
+#include "cmTargetPropCommandBase.h"
 
-class cmExecutionStatus;
+namespace {
 
-bool cmTargetLinkDirectoriesCommand::InitialPass(
-  std::vector<std::string> const& args, cmExecutionStatus&)
+class TargetLinkDirectoriesImpl : public cmTargetPropCommandBase
 {
-  return this->HandleArguments(args, "LINK_DIRECTORIES", PROCESS_BEFORE);
-}
+public:
+  using cmTargetPropCommandBase::cmTargetPropCommandBase;
 
-void cmTargetLinkDirectoriesCommand::HandleMissingTarget(
-  const std::string& name)
-{
-  this->Makefile->IssueMessage(
-    MessageType::FATAL_ERROR,
-    cmStrCat("Cannot specify link directories for target \"", name,
-             "\" which is not built by this project."));
-}
+private:
+  void HandleMissingTarget(const std::string& name) override
+  {
+    this->Makefile->IssueMessage(
+      MessageType::FATAL_ERROR,
+      cmStrCat("Cannot specify link directories for target \"", name,
+               "\" which is not built by this project."));
+  }
+
+  std::string Join(const std::vector<std::string>& content) override;
 
-std::string cmTargetLinkDirectoriesCommand::Join(
+  bool HandleDirectContent(cmTarget* tgt,
+                           const std::vector<std::string>& content,
+                           bool prepend, bool /*system*/) override
+  {
+    cmListFileBacktrace lfbt = this->Makefile->GetBacktrace();
+    tgt->InsertLinkDirectory(this->Join(content), lfbt, prepend);
+    return true; // Successfully handled.
+  }
+};
+
+std::string TargetLinkDirectoriesImpl::Join(
   const std::vector<std::string>& content)
 {
   std::vector<std::string> directories;
@@ -48,12 +60,11 @@ std::string cmTargetLinkDirectoriesCommand::Join(
   return cmJoin(directories, ";");
 }
 
-bool cmTargetLinkDirectoriesCommand::HandleDirectContent(
-  cmTarget* tgt, const std::vector<std::string>& content, bool prepend, bool)
-{
-  cmListFileBacktrace lfbt = this->Makefile->GetBacktrace();
+} // namespace
 
-  tgt->InsertLinkDirectory(this->Join(content), lfbt, prepend);
-
-  return true; // Successfully handled.
+bool cmTargetLinkDirectoriesCommand(std::vector<std::string> const& args,
+                                    cmExecutionStatus& status)
+{
+  return TargetLinkDirectoriesImpl(status).HandleArguments(
+    args, "LINK_DIRECTORIES", TargetLinkDirectoriesImpl::PROCESS_BEFORE);
 }
diff --git a/Source/cmTargetLinkDirectoriesCommand.h b/Source/cmTargetLinkDirectoriesCommand.h
index a651d73f4f..3724d6cf82 100644
--- a/Source/cmTargetLinkDirectoriesCommand.h
+++ b/Source/cmTargetLinkDirectoriesCommand.h
@@ -8,39 +8,9 @@
 #include <string>
 #include <vector>
 
-#include <cm/memory>
-
-#include "cmCommand.h"
-#include "cmTargetPropCommandBase.h"
-
 class cmExecutionStatus;
-class cmTarget;
-
-class cmTargetLinkDirectoriesCommand : public cmTargetPropCommandBase
-{
-public:
-  /**
-   * This is a virtual constructor for the command.
-   */
-  std::unique_ptr<cmCommand> Clone() override
-  {
-    return cm::make_unique<cmTargetLinkDirectoriesCommand>();
-  }
-
-  /**
-   * This is called when the command is first encountered in
-   * the CMakeLists.txt file.
-   */
-  bool InitialPass(std::vector<std::string> const& args,
-                   cmExecutionStatus& status) override;
-
-private:
-  void HandleMissingTarget(const std::string& name) override;
 
-  std::string Join(const std::vector<std::string>& content) override;
-  bool HandleDirectContent(cmTarget* tgt,
-                           const std::vector<std::string>& content,
-                           bool prepend, bool system) override;
-};
+bool cmTargetLinkDirectoriesCommand(std::vector<std::string> const& args,
+                                    cmExecutionStatus& status);
 
 #endif
diff --git a/Source/cmTargetLinkOptionsCommand.cxx b/Source/cmTargetLinkOptionsCommand.cxx
index dbd7bfee96..df9416fad3 100644
--- a/Source/cmTargetLinkOptionsCommand.cxx
+++ b/Source/cmTargetLinkOptionsCommand.cxx
@@ -7,33 +7,44 @@
 #include "cmMessageType.h"
 #include "cmStringAlgorithms.h"
 #include "cmTarget.h"
+#include "cmTargetPropCommandBase.h"
 
-class cmExecutionStatus;
+namespace {
 
-bool cmTargetLinkOptionsCommand::InitialPass(
-  std::vector<std::string> const& args, cmExecutionStatus&)
+class TargetLinkOptionsImpl : public cmTargetPropCommandBase
 {
-  return this->HandleArguments(args, "LINK_OPTIONS", PROCESS_BEFORE);
-}
+public:
+  using cmTargetPropCommandBase::cmTargetPropCommandBase;
 
-void cmTargetLinkOptionsCommand::HandleMissingTarget(const std::string& name)
-{
-  this->Makefile->IssueMessage(
-    MessageType::FATAL_ERROR,
-    cmStrCat("Cannot specify link options for target \"", name,
-             "\" which is not built by this project."));
-}
+private:
+  void HandleMissingTarget(const std::string& name) override
+  {
+    this->Makefile->IssueMessage(
+      MessageType::FATAL_ERROR,
+      cmStrCat("Cannot specify link options for target \"", name,
+               "\" which is not built by this project."));
+  }
 
-std::string cmTargetLinkOptionsCommand::Join(
-  const std::vector<std::string>& content)
-{
-  return cmJoin(content, ";");
-}
+  bool HandleDirectContent(cmTarget* tgt,
+                           const std::vector<std::string>& content,
+                           bool prepend, bool /*system*/) override
+  {
+    cmListFileBacktrace lfbt = this->Makefile->GetBacktrace();
+    tgt->InsertLinkOption(this->Join(content), lfbt, prepend);
+    return true; // Successfully handled.
+  }
+
+  std::string Join(const std::vector<std::string>& content) override
+  {
+    return cmJoin(content, ";");
+  }
+};
+
+} // namespace
 
-bool cmTargetLinkOptionsCommand::HandleDirectContent(
-  cmTarget* tgt, const std::vector<std::string>& content, bool prepend, bool)
+bool cmTargetLinkOptionsCommand(std::vector<std::string> const& args,
+                                cmExecutionStatus& status)
 {
-  cmListFileBacktrace lfbt = this->Makefile->GetBacktrace();
-  tgt->InsertLinkOption(this->Join(content), lfbt, prepend);
-  return true; // Successfully handled.
+  return TargetLinkOptionsImpl(status).HandleArguments(
+    args, "LINK_OPTIONS", TargetLinkOptionsImpl::PROCESS_BEFORE);
 }
diff --git a/Source/cmTargetLinkOptionsCommand.h b/Source/cmTargetLinkOptionsCommand.h
index 918a8d7a8a..13fb40cb69 100644
--- a/Source/cmTargetLinkOptionsCommand.h
+++ b/Source/cmTargetLinkOptionsCommand.h
@@ -8,39 +8,9 @@
 #include <string>
 #include <vector>
 
-#include <cm/memory>
-
-#include "cmCommand.h"
-#include "cmTargetPropCommandBase.h"
-
 class cmExecutionStatus;
-class cmTarget;
-
-class cmTargetLinkOptionsCommand : public cmTargetPropCommandBase
-{
-public:
-  /**
-   * This is a virtual constructor for the command.
-   */
-  std::unique_ptr<cmCommand> Clone() override
-  {
-    return cm::make_unique<cmTargetLinkOptionsCommand>();
-  }
-
-  /**
-   * This is called when the command is first encountered in
-   * the CMakeLists.txt file.
-   */
-  bool InitialPass(std::vector<std::string> const& args,
-                   cmExecutionStatus& status) override;
-
-private:
-  void HandleMissingTarget(const std::string& name) override;
 
-  bool HandleDirectContent(cmTarget* tgt,
-                           const std::vector<std::string>& content,
-                           bool prepend, bool system) override;
-  std::string Join(const std::vector<std::string>& content) override;
-};
+bool cmTargetLinkOptionsCommand(std::vector<std::string> const& args,
+                                cmExecutionStatus& status);
 
 #endif
diff --git a/Source/cmTargetPrecompileHeadersCommand.cxx b/Source/cmTargetPrecompileHeadersCommand.cxx
index 5751fffa19..887d9738cf 100644
--- a/Source/cmTargetPrecompileHeadersCommand.cxx
+++ b/Source/cmTargetPrecompileHeadersCommand.cxx
@@ -8,51 +8,14 @@
 #include "cmStringAlgorithms.h"
 #include "cmSystemTools.h"
 #include "cmTarget.h"
+#include "cmTargetPropCommandBase.h"
 
 #include <utility>
 
-bool cmTargetPrecompileHeadersCommand::InitialPass(
-  std::vector<std::string> const& args, cmExecutionStatus&)
-{
-  return this->HandleArguments(args, "PRECOMPILE_HEADERS", PROCESS_REUSE_FROM);
-}
-
-void cmTargetPrecompileHeadersCommand::HandleInterfaceContent(
-  cmTarget* tgt, const std::vector<std::string>& content, bool prepend,
-  bool system)
-{
-  cmTargetPropCommandBase::HandleInterfaceContent(
-    tgt, ConvertToAbsoluteContent(tgt, content, true), prepend, system);
-}
-
-void cmTargetPrecompileHeadersCommand::HandleMissingTarget(
-  const std::string& name)
-{
-  const std::string e =
-    cmStrCat("Cannot specify precompile headers for target \"", name,
-             "\" which is not built by this project.");
-  this->Makefile->IssueMessage(MessageType::FATAL_ERROR, e);
-}
-
-std::string cmTargetPrecompileHeadersCommand::Join(
-  const std::vector<std::string>& content)
-{
-  return cmJoin(content, ";");
-}
-
-bool cmTargetPrecompileHeadersCommand::HandleDirectContent(
-  cmTarget* tgt, const std::vector<std::string>& content, bool, bool)
-{
-  tgt->AppendProperty(
-    "PRECOMPILE_HEADERS",
-    this->Join(ConvertToAbsoluteContent(tgt, content, false)).c_str());
-  return true;
-}
+namespace {
 
-std::vector<std::string>
-cmTargetPrecompileHeadersCommand::ConvertToAbsoluteContent(
-  cmTarget* /*tgt*/, const std::vector<std::string>& content,
-  bool /*isInterfaceContent*/)
+std::vector<std::string> ConvertToAbsoluteContent(
+  const std::vector<std::string>& content, std::string const& baseDir)
 {
   std::vector<std::string> absoluteContent;
   absoluteContent.reserve(content.size());
@@ -66,10 +29,59 @@ cmTargetPrecompileHeadersCommand::ConvertToAbsoluteContent(
         cmGeneratorExpression::Find(src) == 0) {
       absoluteSrc = src;
     } else {
-      absoluteSrc =
-        cmStrCat(this->Makefile->GetCurrentSourceDirectory(), '/', src);
+      absoluteSrc = cmStrCat(baseDir, '/', src);
     }
     absoluteContent.emplace_back(std::move(absoluteSrc));
   }
   return absoluteContent;
 }
+
+class TargetPrecompileHeadersImpl : public cmTargetPropCommandBase
+{
+public:
+  using cmTargetPropCommandBase::cmTargetPropCommandBase;
+
+private:
+  bool HandleDirectContent(cmTarget* tgt,
+                           const std::vector<std::string>& content,
+                           bool /*prepend*/, bool /*system*/) override
+  {
+    std::string const& base = this->Makefile->GetCurrentSourceDirectory();
+    tgt->AppendProperty(
+      "PRECOMPILE_HEADERS",
+      this->Join(ConvertToAbsoluteContent(content, base)).c_str());
+    return true;
+  }
+
+  void HandleInterfaceContent(cmTarget* tgt,
+                              const std::vector<std::string>& content,
+                              bool prepend, bool system) override
+  {
+    std::string const& base = this->Makefile->GetCurrentSourceDirectory();
+    cmTargetPropCommandBase::HandleInterfaceContent(
+      tgt, ConvertToAbsoluteContent(content, base), prepend, system);
+  }
+
+  void HandleMissingTarget(const std::string& name) override
+  {
+    this->Makefile->IssueMessage(
+      MessageType::FATAL_ERROR,
+      cmStrCat("Cannot specify precompile headers for target \"", name,
+               "\" which is not built by this project."));
+  }
+
+  std::string Join(const std::vector<std::string>& content) override
+  {
+    return cmJoin(content, ";");
+  }
+};
+
+} // namespace
+
+bool cmTargetPrecompileHeadersCommand(std::vector<std::string> const& args,
+                                      cmExecutionStatus& status)
+{
+  return TargetPrecompileHeadersImpl(status).HandleArguments(
+    args, "PRECOMPILE_HEADERS",
+    TargetPrecompileHeadersImpl::PROCESS_REUSE_FROM);
+}
diff --git a/Source/cmTargetPrecompileHeadersCommand.h b/Source/cmTargetPrecompileHeadersCommand.h
index 00dc9285c0..8b0ac97777 100644
--- a/Source/cmTargetPrecompileHeadersCommand.h
+++ b/Source/cmTargetPrecompileHeadersCommand.h
@@ -8,43 +8,9 @@
 #include <string>
 #include <vector>
 
-#include <cm/memory>
-
-#include "cmCommand.h"
-
-#include "cmTargetPropCommandBase.h"
-
 class cmExecutionStatus;
-class cmTarget;
-
-class cmTargetPrecompileHeadersCommand : public cmTargetPropCommandBase
-{
-public:
-  std::unique_ptr<cmCommand> Clone() override
-  {
-    return cm::make_unique<cmTargetPrecompileHeadersCommand>();
-  }
-
-  bool InitialPass(std::vector<std::string> const& args,
-                   cmExecutionStatus& status) override;
-
-protected:
-  void HandleInterfaceContent(cmTarget* tgt,
-                              const std::vector<std::string>& content,
-                              bool prepend, bool system) override;
-
-private:
-  void HandleMissingTarget(const std::string& name) override;
-
-  bool HandleDirectContent(cmTarget* tgt,
-                           const std::vector<std::string>& content,
-                           bool prepend, bool system) override;
-
-  std::string Join(const std::vector<std::string>& content) override;
 
-  std::vector<std::string> ConvertToAbsoluteContent(
-    cmTarget* tgt, const std::vector<std::string>& content,
-    bool isInterfaceContent);
-};
+bool cmTargetPrecompileHeadersCommand(std::vector<std::string> const& args,
+                                      cmExecutionStatus& status);
 
 #endif
diff --git a/Source/cmTargetPropCommandBase.cxx b/Source/cmTargetPropCommandBase.cxx
index 4bc3125478..bbc1e16f76 100644
--- a/Source/cmTargetPropCommandBase.cxx
+++ b/Source/cmTargetPropCommandBase.cxx
@@ -2,12 +2,24 @@
    file Copyright.txt or https://cmake.org/licensing for details.  */
 #include "cmTargetPropCommandBase.h"
 
+#include "cmExecutionStatus.h"
 #include "cmGlobalGenerator.h"
 #include "cmMakefile.h"
 #include "cmStateTypes.h"
 #include "cmTarget.h"
 #include "cmake.h"
 
+cmTargetPropCommandBase::cmTargetPropCommandBase(cmExecutionStatus& status)
+  : Makefile(&status.GetMakefile())
+  , Status(status)
+{
+}
+
+void cmTargetPropCommandBase::SetError(std::string const& e)
+{
+  this->Status.SetError(e);
+}
+
 bool cmTargetPropCommandBase::HandleArguments(
   std::vector<std::string> const& args, const std::string& prop,
   ArgumentFlags flags)
diff --git a/Source/cmTargetPropCommandBase.h b/Source/cmTargetPropCommandBase.h
index b2444172b8..601ad01132 100644
--- a/Source/cmTargetPropCommandBase.h
+++ b/Source/cmTargetPropCommandBase.h
@@ -8,13 +8,18 @@
 #include <string>
 #include <vector>
 
-#include "cmCommand.h"
-
+class cmExecutionStatus;
+class cmMakefile;
 class cmTarget;
 
-class cmTargetPropCommandBase : public cmCommand
+class cmTargetPropCommandBase
 {
 public:
+  cmTargetPropCommandBase(cmExecutionStatus& status);
+  virtual ~cmTargetPropCommandBase() = default;
+
+  void SetError(std::string const& e);
+
   enum ArgumentFlags
   {
     NO_FLAGS = 0x0,
@@ -30,6 +35,7 @@ public:
 protected:
   std::string Property;
   cmTarget* Target = nullptr;
+  cmMakefile* Makefile;
 
   virtual void HandleInterfaceContent(cmTarget* tgt,
                                       const std::vector<std::string>& content,
@@ -49,6 +55,8 @@ private:
   bool PopulateTargetProperies(const std::string& scope,
                                const std::vector<std::string>& content,
                                bool prepend, bool system);
+
+  cmExecutionStatus& Status;
 };
 
 #endif
diff --git a/Source/cmTargetSourcesCommand.cxx b/Source/cmTargetSourcesCommand.cxx
index 7c9d03c539..c2e0b28fe1 100644
--- a/Source/cmTargetSourcesCommand.cxx
+++ b/Source/cmTargetSourcesCommand.cxx
@@ -11,47 +11,54 @@
 #include "cmStringAlgorithms.h"
 #include "cmSystemTools.h"
 #include "cmTarget.h"
+#include "cmTargetPropCommandBase.h"
 
-class cmExecutionStatus;
+namespace {
 
-bool cmTargetSourcesCommand::InitialPass(std::vector<std::string> const& args,
-                                         cmExecutionStatus&)
+class TargetSourcesImpl : public cmTargetPropCommandBase
 {
-  return this->HandleArguments(args, "SOURCES");
-}
+public:
+  using cmTargetPropCommandBase::cmTargetPropCommandBase;
 
-void cmTargetSourcesCommand::HandleInterfaceContent(
-  cmTarget* tgt, const std::vector<std::string>& content, bool prepend,
-  bool system)
-{
-  cmTargetPropCommandBase::HandleInterfaceContent(
-    tgt, ConvertToAbsoluteContent(tgt, content, true), prepend, system);
-}
+protected:
+  void HandleInterfaceContent(cmTarget* tgt,
+                              const std::vector<std::string>& content,
+                              bool prepend, bool system) override
+  {
+    cmTargetPropCommandBase::HandleInterfaceContent(
+      tgt, ConvertToAbsoluteContent(tgt, content, true), prepend, system);
+  }
 
-void cmTargetSourcesCommand::HandleMissingTarget(const std::string& name)
-{
-  this->Makefile->IssueMessage(
-    MessageType::FATAL_ERROR,
-    cmStrCat("Cannot specify sources for target \"", name,
-             "\" which is not built by this project."));
-}
+private:
+  void HandleMissingTarget(const std::string& name) override
+  {
+    this->Makefile->IssueMessage(
+      MessageType::FATAL_ERROR,
+      cmStrCat("Cannot specify sources for target \"", name,
+               "\" which is not built by this project."));
+  }
 
-std::string cmTargetSourcesCommand::Join(
-  const std::vector<std::string>& content)
-{
-  return cmJoin(content, ";");
-}
+  bool HandleDirectContent(cmTarget* tgt,
+                           const std::vector<std::string>& content,
+                           bool /*prepend*/, bool /*system*/) override
+  {
+    tgt->AppendProperty(
+      "SOURCES",
+      this->Join(ConvertToAbsoluteContent(tgt, content, false)).c_str());
+    return true; // Successfully handled.
+  }
 
-bool cmTargetSourcesCommand::HandleDirectContent(
-  cmTarget* tgt, const std::vector<std::string>& content, bool, bool)
-{
-  tgt->AppendProperty(
-    "SOURCES",
-    this->Join(ConvertToAbsoluteContent(tgt, content, false)).c_str());
-  return true; // Successfully handled.
-}
+  std::string Join(const std::vector<std::string>& content) override
+  {
+    return cmJoin(content, ";");
+  }
+
+  std::vector<std::string> ConvertToAbsoluteContent(
+    cmTarget* tgt, const std::vector<std::string>& content,
+    bool isInterfaceContent);
+};
 
-std::vector<std::string> cmTargetSourcesCommand::ConvertToAbsoluteContent(
+std::vector<std::string> TargetSourcesImpl::ConvertToAbsoluteContent(
   cmTarget* tgt, const std::vector<std::string>& content,
   bool isInterfaceContent)
 {
@@ -120,3 +127,11 @@ std::vector<std::string> cmTargetSourcesCommand::ConvertToAbsoluteContent(
 
   return useAbsoluteContent ? absoluteContent : content;
 }
+
+} // namespace
+
+bool cmTargetSourcesCommand(std::vector<std::string> const& args,
+                            cmExecutionStatus& status)
+{
+  return TargetSourcesImpl(status).HandleArguments(args, "SOURCES");
+}
diff --git a/Source/cmTargetSourcesCommand.h b/Source/cmTargetSourcesCommand.h
index 1cff8c3361..5eecf3454e 100644
--- a/Source/cmTargetSourcesCommand.h
+++ b/Source/cmTargetSourcesCommand.h
@@ -8,49 +8,9 @@
 #include <string>
 #include <vector>
 
-#include <cm/memory>
-
-#include "cmCommand.h"
-#include "cmTargetPropCommandBase.h"
-
 class cmExecutionStatus;
-class cmTarget;
-
-class cmTargetSourcesCommand : public cmTargetPropCommandBase
-{
-public:
-  /**
-   * This is a virtual constructor for the command.
-   */
-  std::unique_ptr<cmCommand> Clone() override
-  {
-    return cm::make_unique<cmTargetSourcesCommand>();
-  }
-
-  /**
-   * This is called when the command is first encountered in
-   * the CMakeLists.txt file.
-   */
-  bool InitialPass(std::vector<std::string> const& args,
-                   cmExecutionStatus& status) override;
-
-protected:
-  void HandleInterfaceContent(cmTarget* tgt,
-                              const std::vector<std::string>& content,
-                              bool prepend, bool system) override;
-
-private:
-  void HandleMissingTarget(const std::string& name) override;
-
-  bool HandleDirectContent(cmTarget* tgt,
-                           const std::vector<std::string>& content,
-                           bool prepend, bool system) override;
-
-  std::string Join(const std::vector<std::string>& content) override;
 
-  std::vector<std::string> ConvertToAbsoluteContent(
-    cmTarget* tgt, const std::vector<std::string>& content,
-    bool isInterfaceContent);
-};
+bool cmTargetSourcesCommand(std::vector<std::string> const& args,
+                            cmExecutionStatus& status);
 
 #endif