Merge topic 'list-command-argument-fixes'

08c71ac CMake.List test: explicitely test with lists containing only an empty string
52d9c38 list command: error on too many arguments

Source/cmListCommand.cxx

@@ -429,6 +429,12 @@ bool cmListCommand
     this->SetError("sub-command REVERSE requires a list as an argument.");
     return false;
     }
+  else if(args.size() > 2)
+    {
+    this->SetError(
+      "sub-command REVERSE only takes one argument.");
+    return false;
+    }
 
   const std::string& listName = args[1];
   // expand the variable
@@ -463,6 +469,12 @@ bool cmListCommand
       "sub-command REMOVE_DUPLICATES requires a list as an argument.");
     return false;
     }
+  else if(args.size() > 2)
+    {
+    this->SetError(
+      "sub-command REMOVE_DUPLICATES only takes one argument.");
+    return false;
+    }
 
   const std::string& listName = args[1];
   // expand the variable
@@ -506,6 +518,12 @@ bool cmListCommand
     this->SetError("sub-command SORT requires a list as an argument.");
     return false;
     }
+  else if(args.size() > 2)
+    {
+    this->SetError(
+      "sub-command SORT only takes one argument.");
+    return false;
+    }
 
   const std::string& listName = args[1];
   // expand the variable

Tests/CMakeTests/ListTest.cmake.in

@@ -86,3 +86,14 @@ TEST("REVERSE result" "ken;brad;bill;andy")
 set(result bill andy bill brad ken ken ken)
 list(REMOVE_DUPLICATES result)
 TEST("REMOVE_DUPLICATES result" "bill;andy;brad;ken")
+
+# these commands should just do nothing if the list is already empty
+set(result "")
+list(REMOVE_DUPLICATES result)
+TEST("REMOVE_DUPLICATES empty result" "")
+
+list(REVERSE result)
+TEST("REVERSE empty result" "")
+
+list(SORT result)
+TEST("SORT empty result" "")