cmTarget: Add NAME property

In generator expression contexts, this can be used to determine the
name of the head target in the evaluation.

Source/cmTarget.cxx

@@ -944,6 +944,11 @@ void cmTarget::DefineProperties(cmake *cm)
      "This property is the configuration-specific version of "
      "OSX_ARCHITECTURES.");
 
+  cm->DefineProperty
+    ("NAME", cmProperty::TARGET,
+     "Logical name for the target.",
+     "Read-only logical name for the target as used by CMake.");
+
   cm->DefineProperty
     ("EXPORT_NAME", cmProperty::TARGET,
      "Exported name for target files.",
@@ -2971,7 +2976,13 @@ void cmTarget::SetProperty(const char* prop, const char* value)
     {
     return;
     }
-
+  if (strcmp(prop, "NAME") == 0)
+    {
+    cmOStringStream e;
+    e << "NAME property is read-only\n";
+    this->Makefile->IssueMessage(cmake::FATAL_ERROR, e.str().c_str());
+    return;
+    }
   if(strcmp(prop,"INCLUDE_DIRECTORIES") == 0)
     {
     cmListFileBacktrace lfbt;
@@ -3038,6 +3049,13 @@ void cmTarget::AppendProperty(const char* prop, const char* value,
     {
     return;
     }
+  if (strcmp(prop, "NAME") == 0)
+    {
+    cmOStringStream e;
+    e << "NAME property is read-only\n";
+    this->Makefile->IssueMessage(cmake::FATAL_ERROR, e.str().c_str());
+    return;
+    }
   if(strcmp(prop,"INCLUDE_DIRECTORIES") == 0)
     {
     cmListFileBacktrace lfbt;
@@ -4053,6 +4071,11 @@ const char *cmTarget::GetProperty(const char* prop,
     return 0;
     }
 
+  if (strcmp(prop, "NAME") == 0)
+    {
+    return this->GetName();
+    }
+
   // Watch for special "computed" properties that are dependent on
   // other properties or variables.  Always recompute them.
   if(this->GetType() == cmTarget::EXECUTABLE ||