Add policy CMP0032 to disallow output_required_files

Help/command/output_required_files.rst

 output_required_files
 ---------------------
 
-Deprecated.  Approximate C preprocessor dependency scanning.
+Disallowed.  See CMake Policy :policy:`CMP0032`.
+
+Approximate C preprocessor dependency scanning.
 
 This command exists only because ancient CMake versions provided it.
 CMake handles preprocessor dependency scanning automatically using a

Help/manual/cmake-policies.7.rst

@@ -61,3 +61,4 @@ All Policies
    /policy/CMP0029
    /policy/CMP0030
    /policy/CMP0031
+   /policy/CMP0032

Help/policy/CMP0032.rst

+CMP0032
+-------
+
+The :command:`output_required_files` command should not be called.
+
+This command was added in June 2001 to expose the then-current CMake
+implicit dependency scanner.  CMake's real implicit dependency scanner
+has evolved since then but is not exposed through this command.  The
+scanning capabilities of this command are very limited and this
+functionality is better achieved through dedicated outside tools.
+
+.. |disallowed_version| replace:: 3.0.0
+.. include:: DISALLOWED_COMMAND.txt

Source/cmOutputRequiredFilesCommand.cxx

@@ -174,6 +174,9 @@ void cmLBDepend::DependWalk(cmDependInformation* info)
 bool cmOutputRequiredFilesCommand
 ::InitialPass(std::vector<std::string> const& args, cmExecutionStatus &)
 {
+  if(this->Disallowed(cmPolicies::CMP0032,
+      "The output_required_files command should not be called; see CMP0032."))
+    { return true; }
   if(args.size() != 2 )
     {
     this->SetError("called with incorrect number of arguments");

Source/cmOutputRequiredFilesCommand.h

@@ -15,45 +15,19 @@
 #include "cmCommand.h"
 #include "cmMakeDepend.h"
 
-/** \class cmOutputRequiredFilesCommand
- * \brief Output a list of required files for a source file
- *
- */
 class cmOutputRequiredFilesCommand : public cmCommand
 {
 public:
-  /**
-   * This is a virtual constructor for the command.
-   */
-  virtual cmCommand* Clone()
-    {
-    return new cmOutputRequiredFilesCommand;
-    }
-
-  /**
-   * This is called when the command is first encountered in
-   * the CMakeLists.txt file.
-   */
+  cmTypeMacro(cmOutputRequiredFilesCommand, cmCommand);
+  virtual cmCommand* Clone() { return new cmOutputRequiredFilesCommand; }
   virtual bool InitialPass(std::vector<std::string> const& args,
                            cmExecutionStatus &status);
-
-  /**
-   * The name of the command as specified in CMakeList.txt.
-   */
   virtual const char* GetName() const { return "output_required_files";}
+  virtual bool IsDiscouraged() const { return true; }
 
-  /** This command is kept for compatibility with older CMake versions. */
-  virtual bool IsDiscouraged() const
-    {
-    return true;
-    }
-
-
-  cmTypeMacro(cmOutputRequiredFilesCommand, cmCommand);
   void ListDependencies(cmDependInformation const *info,
                         FILE *fout,
                         std::set<cmDependInformation const*> *visited);
-
 private:
   std::string File;
   std::string OutputFile;

Source/cmPolicies.cxx

@@ -261,6 +261,11 @@ cmPolicies::cmPolicies()
     CMP0031, "CMP0031",
     "The load_command command should not be called.",
     3,0,0,0, cmPolicies::WARN);
+
+  this->DefinePolicy(
+    CMP0032, "CMP0032",
+    "The output_required_files command should not be called.",
+    3,0,0,0, cmPolicies::WARN);
 }
 
 cmPolicies::~cmPolicies()

Source/cmPolicies.h

@@ -83,6 +83,7 @@ public:
     CMP0029, ///< Disallow command: subdir_depends
     CMP0030, ///< Disallow command: use_mangled_mesa
     CMP0031, ///< Disallow command: load_command
+    CMP0032, ///< Disallow command: output_required_files
 
     /** \brief Always the last entry.
      *

Tests/RunCMake/DisallowedCommands/CMP0032-NEW-result.txt

+1

Tests/RunCMake/DisallowedCommands/CMP0032-NEW-stderr.txt

+CMake Error at CMP0032-NEW.cmake:2 \(output_required_files\):
+  The output_required_files command should not be called; see CMP0032.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)

Tests/RunCMake/DisallowedCommands/CMP0032-NEW.cmake

+cmake_policy(SET CMP0032 NEW)
+output_required_files()

Tests/RunCMake/DisallowedCommands/CMP0032-OLD-result.txt

+1

Tests/RunCMake/DisallowedCommands/CMP0032-OLD-stderr.txt

+CMake Error at CMP0032-OLD.cmake:2 \(output_required_files\):
+  output_required_files called with incorrect number of arguments
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)

Tests/RunCMake/DisallowedCommands/CMP0032-OLD.cmake

+cmake_policy(SET CMP0032 OLD)
+output_required_files()

Tests/RunCMake/DisallowedCommands/CMP0032-WARN-result.txt

+1

Tests/RunCMake/DisallowedCommands/CMP0032-WARN-stderr.txt

+CMake Warning \(dev\) at CMP0032-WARN.cmake:1 \(output_required_files\):
+  Policy CMP0032 is not set: The output_required_files command should not be
+  called.  Run "cmake --help-policy CMP0032" for policy details.  Use the
+  cmake_policy command to set the policy and suppress this warning.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)
+This warning is for project developers.  Use -Wno-dev to suppress it.
+
+CMake Error at CMP0032-WARN.cmake:1 \(output_required_files\):
+  output_required_files called with incorrect number of arguments
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)

Tests/RunCMake/DisallowedCommands/CMP0032-WARN.cmake

+output_required_files()

Tests/RunCMake/DisallowedCommands/RunCMakeTest.cmake

@@ -4,6 +4,7 @@ foreach(p
     CMP0029
     CMP0030
     CMP0031
+    CMP0032
     )
   run_cmake(${p}-WARN)
   run_cmake(${p}-OLD)