Add the ALIAS target concept for libraries and executables.

* The ALIAS name must match a validity regex.
* Executables and libraries may be aliased.
* An ALIAS acts immutable. It can not be used as the lhs
  of target_link_libraries or other commands.
* An ALIAS can be used with add_custom_command, add_custom_target,
  and add_test in the same way regular targets can.
* The target of an ALIAS can be retrieved with the ALIASED_TARGET
  target property.
* An ALIAS does not appear in the generated buildsystem. It
  is kept separate from cmMakefile::Targets for that reason.
* A target may have multiple aliases.
* An ALIAS target may not itself have an alias.
* An IMPORTED target may not have an alias.
* An ALIAS may not be exported or imported.

1 files changed, 7 insertions, 0 deletions

diff --git a/Source/cmAddDependenciesCommand.cxx b/Source/cmAddDependenciesCommand.cxx
index 04a304e391..e4d7f7f1ec 100644
--- a/Source/cmAddDependenciesCommand.cxx
+++ b/Source/cmAddDependenciesCommand.cxx
@@ -24,6 +24,13 @@ bool cmAddDependenciesCommand
     }
 
   std::string target_name = args[0];
+  if(this->Makefile->IsAlias(target_name.c_str()))
+    {
+    cmOStringStream e;
+    e << "Cannot add target-level dependencies to alias target \""
+      << target_name << "\".\n";
+    this->Makefile->IssueMessage(cmake::FATAL_ERROR, e.str());
+    }
   if(cmTarget* target = this->Makefile->FindTargetToUse(target_name.c_str()))
     {
     std::vector<std::string>::const_iterator s = args.begin();