Add USES_TERMINAL option for custom commands

Teach the add_custom_command and add_custom_target commands a new
USES_TERMINAL option.  Use it to tell the generator to give the command
direct access to the terminal if possible.

1 files changed, 15 insertions, 1 deletions

diff --git a/Source/cmAddCustomTargetCommand.cxx b/Source/cmAddCustomTargetCommand.cxx
index 64e76f3..fc4f8f1 100644
--- a/Source/cmAddCustomTargetCommand.cxx
+++ b/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;
@@ -93,6 +94,11 @@ bool cmAddCustomTargetCommand
       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);