Merge topic 'console-pool'

2d75d7e5 Help: Add notes for topic 'console-pool'
f42d86f0 Ninja: Implement USES_TERMINAL using the console pool if available
f281ae01 Ninja: Remove unused declaration
d5eae556 Ninja: factor out the test for console pool support
4d1fedf4 Give the interactive cache editor the USES_TERMINAL property
fe5d6e8c Add USES_TERMINAL option for custom commands
ad6ee426 Rename doing_verbatim to doing_nothing

Help/command/add_custom_command.rst

@@ -18,7 +18,8 @@ The first signature is for adding a custom command to produce an output::
                      [IMPLICIT_DEPENDS <lang1> depend1
                                       [<lang2> depend2] ...]
                      [WORKING_DIRECTORY dir]
-                     [COMMENT comment] [VERBATIM] [APPEND])
+                     [COMMENT comment]
+                     [VERBATIM] [APPEND] [USES_TERMINAL])
 
 This defines a command to generate specified ``OUTPUT`` file(s).
 A target created in the same directory (``CMakeLists.txt`` file)
@@ -120,6 +121,11 @@ The options are:
   as a file on disk it should be marked with the :prop_sf:`SYMBOLIC`
   source file property.
 
+``USES_TERMINAL``
+  The command will be given direct access to the terminal if possible.
+  With the :generator:`Ninja` generator, this places the command in
+  the ``console`` pool.
+
 ``VERBATIM``
   All arguments to the commands will be escaped properly for the
   build tool so that the invoked command receives each argument
@@ -151,7 +157,8 @@ target is already built, the command will not execute.
                      COMMAND command1 [ARGS] [args1...]
                      [COMMAND command2 [ARGS] [args2...] ...]
                      [WORKING_DIRECTORY dir]
-                     [COMMENT comment] [VERBATIM])
+                     [COMMENT comment]
+                     [VERBATIM] [USES_TERMINAL])
 
 This defines a new command that will be associated with building the
 specified target.  When the command will happen is determined by which

Help/command/add_custom_target.rst

@@ -9,7 +9,8 @@ Add a target with no output so it will always be built.
                     [COMMAND command2 [args2...] ...]
                     [DEPENDS depend depend depend ... ]
                     [WORKING_DIRECTORY dir]
-                    [COMMENT comment] [VERBATIM]
+                    [COMMENT comment]
+                    [VERBATIM] [USES_TERMINAL]
                     [SOURCES src1 [src2...]])
 
 Adds a target with the given name that executes the given commands.
@@ -74,6 +75,11 @@ The options are:
   is platform specific because there is no protection of
   tool-specific special characters.
 
+``USES_TERMINAL``
+  The command will be given direct access to the terminal if possible.
+  With the :generator:`Ninja` generator, this places the command in
+  the ``console`` pool.
+
 ``WORKING_DIRECTORY``
   Execute the command with the given current working directory.
   If it is a relative path it will be interpreted relative to the

Help/release/dev/console-pool.rst

@@ -0,0 +1,8 @@
+console-pool
+------------
+
+* The :command:`add_custom_command` and :command:`add_custom_target`
+  commands learned a new ``USES_TERMINAL`` option to request that
+  the command be given direct access to the terminal if possible.
+  The :generator:`Ninja` generator will places such commands in the
+  ``console`` pool.

Source/cmAddCustomCommandCommand.cxx

@@ -35,6 +35,7 @@ bool cmAddCustomCommandCommand
   std::vector<std::string> depends, outputs, output;
   bool verbatim = false;
   bool append = false;
+  bool uses_terminal = false;
   std::string implicit_depends_lang;
   cmCustomCommand::ImplicitDependsList implicit_depends;
 
@@ -102,6 +103,10 @@ bool cmAddCustomCommandCommand
       {
       append = true;
       }
+    else if(copy == "USES_TERMINAL")
+      {
+      uses_terminal = true;
+      }
     else if(copy == "TARGET")
       {
       doing = doing_target;
@@ -312,7 +317,7 @@ bool cmAddCustomCommandCommand
     this->Makefile->AddCustomCommandToTarget(target, no_depends,
                                              commandLines, cctype,
                                              comment, working.c_str(),
-                                             escapeOldStyle);
+                                             escapeOldStyle, uses_terminal);
     }
   else if(target.empty())
     {
@@ -321,7 +326,7 @@ bool cmAddCustomCommandCommand
                                              main_dependency,
                                              commandLines, comment,
                                              working.c_str(), false,
-                                             escapeOldStyle);
+                                             escapeOldStyle, uses_terminal);
 
     // Add implicit dependency scanning requests if any were given.
     if(!implicit_depends.empty())
@@ -346,6 +351,11 @@ bool cmAddCustomCommandCommand
         }
       }
     }
+  else if (uses_terminal)
+    {
+    this->SetError("USES_TERMINAL may not be used with SOURCE signatures");
+    return false;
+    }
   else
     {
     bool issueMessage = true;

Source/cmAddCustomTargetCommand.cxx

@@ -48,6 +48,7 @@ bool cmAddCustomTargetCommand
   std::vector<std::string> depends;
   std::string working_directory;
   bool verbatim = false;
+  bool uses_terminal = false;
   std::string comment_buffer;
   const char* comment = 0;
   std::vector<std::string> sources;
@@ -59,7 +60,7 @@ bool cmAddCustomTargetCommand
     doing_working_directory,
     doing_comment,
     doing_source,
-    doing_verbatim
+    doing_nothing
   };
   tdoing doing = doing_command;
 
@@ -90,9 +91,14 @@ bool cmAddCustomTargetCommand
       }
     else if(copy == "VERBATIM")
       {
-      doing = doing_verbatim;
+      doing = doing_nothing;
       verbatim = true;
       }
+    else if(copy == "USES_TERMINAL")
+      {
+      doing = doing_nothing;
+      uses_terminal = true;
+      }
     else if (copy == "COMMENT")
       {
       doing = doing_comment;
@@ -221,12 +227,20 @@ bool cmAddCustomTargetCommand
       cmSystemTools::CollapseFullPath(working_directory, build_dir);
     }
 
+  if (commandLines.empty() && uses_terminal)
+    {
+    this->Makefile->IssueMessage(cmake::FATAL_ERROR,
+      "USES_TERMINAL may not be specified without any COMMAND");
+    return true;
+    }
+
   // Add the utility target to the makefile.
   bool escapeOldStyle = !verbatim;
   cmTarget* target =
     this->Makefile->AddUtilityCommand(targetName, excludeFromAll,
                                       working_directory.c_str(), depends,
-                                      commandLines, escapeOldStyle, comment);
+                                      commandLines, escapeOldStyle, comment,
+                                      uses_terminal);
 
   // Add additional user-specified source files to the target.
   target->AddSources(sources);

Source/cmCustomCommand.cxx

@@ -22,6 +22,7 @@ cmCustomCommand::cmCustomCommand()
   this->HaveComment = false;
   this->EscapeOldStyle = true;
   this->EscapeAllowMakeVars = false;
+  this->UsesTerminal = false;
 }
 
 //----------------------------------------------------------------------------
@@ -34,7 +35,8 @@ cmCustomCommand::cmCustomCommand(const cmCustomCommand& r):
   WorkingDirectory(r.WorkingDirectory),
   EscapeAllowMakeVars(r.EscapeAllowMakeVars),
   EscapeOldStyle(r.EscapeOldStyle),
-  Backtrace(r.Backtrace)
+  Backtrace(r.Backtrace),
+  UsesTerminal(r.UsesTerminal)
 {
 }
 
@@ -56,6 +58,7 @@ cmCustomCommand& cmCustomCommand::operator=(cmCustomCommand const& r)
   this->EscapeOldStyle = r.EscapeOldStyle;
   this->ImplicitDepends = r.ImplicitDepends;
   this->Backtrace = r.Backtrace;
+  this->UsesTerminal = r.UsesTerminal;
 
   return *this;
 }
@@ -184,3 +187,15 @@ void cmCustomCommand::AppendImplicitDepends(ImplicitDependsList const& l)
   this->ImplicitDepends.insert(this->ImplicitDepends.end(),
                                l.begin(), l.end());
 }
+
+//----------------------------------------------------------------------------
+bool cmCustomCommand::GetUsesTerminal() const
+{
+  return this->UsesTerminal;
+}
+
+//----------------------------------------------------------------------------
+void cmCustomCommand::SetUsesTerminal(bool b)
+{
+  this->UsesTerminal = b;
+}

Source/cmCustomCommand.h

@@ -79,6 +79,11 @@ public:
   void AppendImplicitDepends(ImplicitDependsList const&);
   ImplicitDependsList const& GetImplicitDepends() const;
 
+  /** Set/Get whether this custom command should be given access to the
+      real console (if possible).  */
+  bool GetUsesTerminal() const;
+  void SetUsesTerminal(bool b);
+
 private:
   std::vector<std::string> Outputs;
   std::vector<std::string> Depends;
@@ -90,6 +95,7 @@ private:
   bool EscapeOldStyle;
   cmListFileBacktrace Backtrace;
   ImplicitDependsList ImplicitDepends;
+  bool UsesTerminal;
 };
 
 #endif

Source/cmGlobalGenerator.cxx

@@ -2207,7 +2207,7 @@ void cmGlobalGenerator::CreateDefaultGlobalTargets(cmTargets* targets)
       = this->CreateGlobalTarget(this->GetPackageTargetName(),
                                  "Run CPack packaging tool...",
                                  &cpackCommandLines, depends,
-                                 workingDir.c_str());
+                                 workingDir.c_str(), /*uses_terminal*/false);
     }
   // CPack source
   const char* packageSourceTargetName = this->GetPackageSourceTargetName();
@@ -2231,8 +2231,7 @@ void cmGlobalGenerator::CreateDefaultGlobalTargets(cmTargets* targets)
         = this->CreateGlobalTarget(packageSourceTargetName,
                                    "Run CPack packaging tool for source...",
                                    &cpackCommandLines, depends,
-                                   workingDir.c_str()
-                                   );
+                                   workingDir.c_str(), /*uses_terminal*/false);
       }
     }
 
@@ -2257,7 +2256,8 @@ void cmGlobalGenerator::CreateDefaultGlobalTargets(cmTargets* targets)
     cpackCommandLines.push_back(singleLine);
     (*targets)[this->GetTestTargetName()]
       = this->CreateGlobalTarget(this->GetTestTargetName(),
-        "Running tests...", &cpackCommandLines, depends, 0);
+        "Running tests...", &cpackCommandLines, depends, 0,
+        /*uses_terminal*/false);
     }
 
   //Edit Cache
@@ -2280,7 +2280,7 @@ void cmGlobalGenerator::CreateDefaultGlobalTargets(cmTargets* targets)
       (*targets)[editCacheTargetName] =
         this->CreateGlobalTarget(
           editCacheTargetName, "Running CMake cache editor...",
-          &cpackCommandLines, depends, 0);
+          &cpackCommandLines, depends, 0, /*uses_terminal*/true);
       }
     else
       {
@@ -2293,7 +2293,7 @@ void cmGlobalGenerator::CreateDefaultGlobalTargets(cmTargets* targets)
         this->CreateGlobalTarget(
           editCacheTargetName,
           "No interactive CMake dialog available...",
-          &cpackCommandLines, depends, 0);
+          &cpackCommandLines, depends, 0, /*uses_terminal*/false);
       }
     }
 
@@ -2312,7 +2312,7 @@ void cmGlobalGenerator::CreateDefaultGlobalTargets(cmTargets* targets)
     (*targets)[rebuildCacheTargetName] =
       this->CreateGlobalTarget(
         rebuildCacheTargetName, "Running CMake to regenerate build system...",
-        &cpackCommandLines, depends, 0);
+        &cpackCommandLines, depends, 0, /*uses_terminal*/false);
     }
 
   //Install
@@ -2352,7 +2352,7 @@ void cmGlobalGenerator::CreateDefaultGlobalTargets(cmTargets* targets)
       (*targets)["list_install_components"]
         = this->CreateGlobalTarget("list_install_components",
           ostr.str().c_str(),
-          &cpackCommandLines, depends, 0);
+          &cpackCommandLines, depends, 0, /*uses_terminal*/false);
       }
     std::string cmd = cmakeCommand;
     cpackCommandLines.erase(cpackCommandLines.begin(),
@@ -2393,7 +2393,7 @@ void cmGlobalGenerator::CreateDefaultGlobalTargets(cmTargets* targets)
     (*targets)[this->GetInstallTargetName()] =
       this->CreateGlobalTarget(
         this->GetInstallTargetName(), "Install the project...",
-        &cpackCommandLines, depends, 0);
+        &cpackCommandLines, depends, 0, /*uses_terminal*/false);
 
     // install_local
     if(const char* install_local = this->GetInstallLocalTargetName())
@@ -2409,7 +2409,7 @@ void cmGlobalGenerator::CreateDefaultGlobalTargets(cmTargets* targets)
       (*targets)[install_local] =
         this->CreateGlobalTarget(
           install_local, "Installing only the local directory...",
-          &cpackCommandLines, depends, 0);
+          &cpackCommandLines, depends, 0, /*uses_terminal*/false);
       }
 
     // install_strip
@@ -2426,7 +2426,7 @@ void cmGlobalGenerator::CreateDefaultGlobalTargets(cmTargets* targets)
       (*targets)[install_strip] =
         this->CreateGlobalTarget(
           install_strip, "Installing the project stripped...",
-          &cpackCommandLines, depends, 0);
+          &cpackCommandLines, depends, 0, /*uses_terminal*/false);
       }
     }
 }
@@ -2500,7 +2500,8 @@ cmTarget cmGlobalGenerator::CreateGlobalTarget(
   const std::string& name, const char* message,
   const cmCustomCommandLines* commandLines,
   std::vector<std::string> depends,
-  const char* workingDirectory)
+  const char* workingDirectory,
+  bool uses_terminal)
 {
   // Package
   cmTarget target;
@@ -2513,6 +2514,7 @@ cmTarget cmGlobalGenerator::CreateGlobalTarget(
   // Store the custom command in the target.
   cmCustomCommand cc(0, no_outputs, no_depends, *commandLines, 0,
                      workingDirectory);
+  cc.SetUsesTerminal(uses_terminal);
   target.AddPostBuildCommand(cc);
   target.SetProperty("EchoString", message);
   std::vector<std::string>::iterator dit;

Source/cmGlobalGenerator.h

@@ -385,7 +385,8 @@ protected:
   void CreateDefaultGlobalTargets(cmTargets* targets);
   cmTarget CreateGlobalTarget(const std::string& name, const char* message,
     const cmCustomCommandLines* commandLines,
-    std::vector<std::string> depends, const char* workingDir);
+    std::vector<std::string> depends, const char* workingDir,
+    bool uses_terminal);
 
   bool NeedSymbolicMark;
   bool UseLinkScript;

Source/cmGlobalNinjaGenerator.cxx

@@ -250,6 +250,7 @@ void
 cmGlobalNinjaGenerator::WriteCustomCommandBuild(const std::string& command,
                                                 const std::string& description,
                                                 const std::string& comment,
+                                                bool uses_terminal,
                                                 const cmNinjaDeps& outputs,
                                                 const cmNinjaDeps& deps,
                                                 const cmNinjaDeps& orderOnly)
@@ -266,6 +267,10 @@ cmGlobalNinjaGenerator::WriteCustomCommandBuild(const std::string& command,
   cmNinjaVars vars;
   vars["COMMAND"] = cmd;
   vars["DESC"] = EncodeLiteral(description);
+  if (uses_terminal && SupportsConsolePool())
+    {
+    vars["pool"] = "console";
+    }
 
   this->WriteBuild(*this->BuildFileStream,
                    comment,
@@ -826,6 +831,7 @@ void cmGlobalNinjaGenerator::WriteAssumedSourceDependencies()
     std::copy(i->second.begin(), i->second.end(), std::back_inserter(deps));
     WriteCustomCommandBuild(/*command=*/"", /*description=*/"",
                             "Assume dependencies for generated source file.",
+                            /*uses_terminal*/false,
                             cmNinjaDeps(1, i->first), deps);
   }
 }
@@ -1141,9 +1147,7 @@ void cmGlobalNinjaGenerator::WriteTargetRebuildManifest(std::ostream& os)
   cmNinjaVars variables;
   // Use 'console' pool to get non buffered output of the CMake re-run call
   // Available since Ninja 1.5
-  if(cmSystemTools::VersionCompare(cmSystemTools::OP_LESS,
-                                   ninjaVersion().c_str(),
-                                   "1.5") == false)
+  if(SupportsConsolePool())
     {
     variables["pool"] = "console";
     }
@@ -1185,6 +1189,12 @@ std::string cmGlobalNinjaGenerator::ninjaVersion() const
   return version;
 }
 
+bool cmGlobalNinjaGenerator::SupportsConsolePool() const
+{
+  return cmSystemTools::VersionCompare(cmSystemTools::OP_LESS,
+                                       ninjaVersion().c_str(), "1.5") == false;
+}
+
 void cmGlobalNinjaGenerator::WriteTargetClean(std::ostream& os)
 {
   WriteRule(*this->RulesFileStream,

Source/cmGlobalNinjaGenerator.h

@@ -103,6 +103,7 @@ public:
   void WriteCustomCommandBuild(const std::string& command,
                                const std::string& description,
                                const std::string& comment,
+                               bool uses_terminal,
                                const cmNinjaDeps& outputs,
                                const cmNinjaDeps& deps = cmNinjaDeps(),
                                const cmNinjaDeps& orderOnly = cmNinjaDeps());
@@ -299,6 +300,9 @@ public:
   virtual void ComputeTargetObjectDirectory(cmGeneratorTarget* gt) const;
 
   std::string ninjaVersion() const;
+
+  bool SupportsConsolePool() const;
+
 protected:
 
   /// Overloaded methods. @see cmGlobalGenerator::Generate()

Source/cmLocalNinjaGenerator.cxx

@@ -468,6 +468,7 @@ cmLocalNinjaGenerator::WriteCustomCommandBuildStatement(
       this->BuildCommandLine(cmdLines),
       this->ConstructComment(ccg),
       "Custom command for " + ninjaOutputs[0],
+      cc->GetUsesTerminal(),
       ninjaOutputs,
       ninjaDeps,
       orderOnlyDeps);

Source/cmMakefile.cxx

@@ -885,7 +885,8 @@ cmMakefile::AddCustomCommandToTarget(const std::string& target,
                                      cmTarget::CustomCommandType type,
                                      const char* comment,
                                      const char* workingDir,
-                                     bool escapeOldStyle) const
+                                     bool escapeOldStyle,
+                                     bool uses_terminal) const
 {
   // Find the target to which to add the custom command.
   cmTargets::iterator ti = this->Targets.find(target);
@@ -941,6 +942,7 @@ cmMakefile::AddCustomCommandToTarget(const std::string& target,
                      commandLines, comment, workingDir);
   cc.SetEscapeOldStyle(escapeOldStyle);
   cc.SetEscapeAllowMakeVars(true);
+  cc.SetUsesTerminal(uses_terminal);
   switch(type)
     {
     case cmTarget::PRE_BUILD:
@@ -964,7 +966,8 @@ cmMakefile::AddCustomCommandToOutput(const std::vector<std::string>& outputs,
                                      const char* comment,
                                      const char* workingDir,
                                      bool replace,
-                                     bool escapeOldStyle)
+                                     bool escapeOldStyle,
+                                     bool uses_terminal)
 {
   // Make sure there is at least one output.
   if(outputs.empty())
@@ -1071,6 +1074,7 @@ cmMakefile::AddCustomCommandToOutput(const std::vector<std::string>& outputs,
                           comment, workingDir);
     cc->SetEscapeOldStyle(escapeOldStyle);
     cc->SetEscapeAllowMakeVars(true);
+    cc->SetUsesTerminal(uses_terminal);
     file->SetCustomCommand(cc);
     this->UpdateOutputToSourceMap(outputs, file);
     }
@@ -1119,13 +1123,15 @@ cmMakefile::AddCustomCommandToOutput(const std::string& output,
                                      const char* comment,
                                      const char* workingDir,
                                      bool replace,
-                                     bool escapeOldStyle)
+                                     bool escapeOldStyle,
+                                     bool uses_terminal)
 {
   std::vector<std::string> outputs;
   outputs.push_back(output);
   return this->AddCustomCommandToOutput(outputs, depends, main_dependency,
                                         commandLines, comment, workingDir,
-                                        replace, escapeOldStyle);
+                                        replace, escapeOldStyle,
+                                        uses_terminal);
 }
 
 //----------------------------------------------------------------------------
@@ -1242,7 +1248,8 @@ cmMakefile::AddUtilityCommand(const std::string& utilityName,
                               const char* workingDirectory,
                               const std::vector<std::string>& depends,
                               const cmCustomCommandLines& commandLines,
-                              bool escapeOldStyle, const char* comment)
+                              bool escapeOldStyle, const char* comment,
+                              bool uses_terminal)
 {
   // Create a target instance for this utility.
   cmTarget* target = this->AddNewTarget(cmTarget::UTILITY, utilityName);
@@ -1269,7 +1276,7 @@ cmMakefile::AddUtilityCommand(const std::string& utilityName,
                                    no_main_dependency,
                                    commandLines, comment,
                                    workingDirectory, no_replace,
-                                   escapeOldStyle);
+                                   escapeOldStyle, uses_terminal);
     cmSourceFile* sf = target->AddSourceCMP0049(force);
 
     // The output is not actually created so mark it symbolic.

Source/cmMakefile.h

@@ -174,7 +174,8 @@ public:
                                 const cmCustomCommandLines& commandLines,
                                 cmTarget::CustomCommandType type,
                                 const char* comment, const char* workingDir,
-                                bool escapeOldStyle = true) const;
+                                bool escapeOldStyle = true,
+                                bool uses_terminal = false) const;
   cmSourceFile* AddCustomCommandToOutput(
     const std::vector<std::string>& outputs,
     const std::vector<std::string>& depends,
@@ -182,7 +183,8 @@ public:
     const cmCustomCommandLines& commandLines,
     const char* comment, const char* workingDir,
     bool replace = false,
-    bool escapeOldStyle = true);
+    bool escapeOldStyle = true,
+    bool uses_terminal = false);
   cmSourceFile* AddCustomCommandToOutput(
     const std::string& output,
     const std::vector<std::string>& depends,
@@ -190,7 +192,8 @@ public:
     const cmCustomCommandLines& commandLines,
     const char* comment, const char* workingDir,
     bool replace = false,
-    bool escapeOldStyle = true);
+    bool escapeOldStyle = true,
+    bool uses_terminal = false);
   void AddCustomCommandOldStyle(const std::string& target,
                                 const std::vector<std::string>& outputs,
                                 const std::vector<std::string>& depends,
@@ -237,7 +240,8 @@ public:
                               const std::vector<std::string>& depends,
                               const cmCustomCommandLines& commandLines,
                               bool escapeOldStyle = true,
-                              const char* comment = 0);
+                              const char* comment = 0,
+                              bool uses_terminal = false);
 
   /**
    * Add a link library to the build.

Source/cmNinjaTargetGenerator.h

@@ -116,7 +116,6 @@ protected:
   void WriteObjectBuildStatements();
   void WriteObjectBuildStatement(cmSourceFile const* source,
                                  bool writeOrderDependsTargetForTarget);
-  void WriteCustomCommandBuildStatement(cmCustomCommand *cc);
 
   cmNinjaDeps GetObjects() const
   { return this->Objects; }

Source/cmNinjaUtilityTargetGenerator.cxx

@@ -35,6 +35,8 @@ void cmNinjaUtilityTargetGenerator::Generate()
     &this->GetTarget()->GetPostBuildCommands()
   };
 
+  bool uses_terminal = false;
+
   for (unsigned i = 0; i != 2; ++i) {
     for (std::vector<cmCustomCommand>::const_iterator
          ci = cmdLists[i]->begin(); ci != cmdLists[i]->end(); ++ci) {
@@ -42,6 +44,8 @@ void cmNinjaUtilityTargetGenerator::Generate()
                                    this->GetMakefile());
       this->GetLocalGenerator()->AppendCustomCommandDeps(ccg, deps);
       this->GetLocalGenerator()->AppendCustomCommandLines(ccg, commands);
+      if (ci->GetUsesTerminal())
+        uses_terminal = true;
     }
   }
 
@@ -110,6 +114,7 @@ void cmNinjaUtilityTargetGenerator::Generate()
       command,
       desc,
       "Utility command for " + this->GetTargetName(),
+      uses_terminal,
       cmNinjaDeps(1, utilCommandName),
       deps);
 

Tests/CustomCommand/CMakeLists.txt

@@ -483,3 +483,26 @@ add_custom_command(
   COMMAND ${CMAKE_COMMAND} -E touch "${gen_file}")
 
 add_library(NormDepends "${gen_file}")
+
+# Test that USES_TERMINAL is parsed correctly.
+# It seems much more difficult to test that USES_TERMINAL actually gives
+# the subprocess console access, as test output is piped through CTest,
+# and CTest itself might not be connected to the console.
+
+set(gen_file "${gen_path}/bar2.cxx")
+
+add_custom_command(
+  OUTPUT "${gen_file}"
+  DEPENDS "${gen_path}"
+  COMMAND ${CMAKE_COMMAND} -E touch "${gen_file}"
+  VERBATIM
+  USES_TERMINAL
+)
+
+add_library(UseConsole "${gen_file}")
+
+add_custom_target(UseConsoleTarget ALL
+  COMMAND ${CMAKE_COMMAND} -E echo "Custom console target."
+  VERBATIM
+  USES_TERMINAL
+)

Tests/RunCMake/add_custom_command/RunCMakeTest.cmake

@@ -6,3 +6,4 @@ run_cmake(BadArgument)
 run_cmake(NoArguments)
 run_cmake(NoOutputOrTarget)
 run_cmake(OutputAndTarget)
+run_cmake(SourceUsesTerminal)

Tests/RunCMake/add_custom_command/SourceUsesTerminal-result.txt

@@ -0,0 +1 @@
+1

Tests/RunCMake/add_custom_command/SourceUsesTerminal-stderr.txt

@@ -0,0 +1,4 @@
+CMake Error at SourceUsesTerminal.cmake:1 \(add_custom_command\):
+  add_custom_command USES_TERMINAL may not be used with SOURCE signatures
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)

Tests/RunCMake/add_custom_command/SourceUsesTerminal.cmake

@@ -0,0 +1 @@
+add_custom_command(SOURCE t TARGET t USES_TERMINAL)

Tests/RunCMake/add_custom_target/RunCMakeTest.cmake

@@ -2,3 +2,4 @@ include(RunCMake)
 
 run_cmake(NoArguments)
 run_cmake(BadTargetName)
+run_cmake(UsesTerminalNoCommand)

Tests/RunCMake/add_custom_target/UsesTerminalNoCommand-result.txt

@@ -0,0 +1 @@
+1

Tests/RunCMake/add_custom_target/UsesTerminalNoCommand-stderr.txt

@@ -0,0 +1,4 @@
+CMake Error at UsesTerminalNoCommand.cmake:1 \(add_custom_target\):
+  USES_TERMINAL may not be specified without any COMMAND
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)

Tests/RunCMake/add_custom_target/UsesTerminalNoCommand.cmake

@@ -0,0 +1 @@
+add_custom_target(MyTarget USES_TERMINAL)