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, 28 insertions, 0 deletions

diff --git a/Tests/AliasTarget/bat.cpp b/Tests/AliasTarget/bat.cpp
new file mode 100644
index 0000000..1063c21
--- /dev/null
+++ b/Tests/AliasTarget/bat.cpp
@@ -0,0 +1,28 @@
+
+#ifndef FOO_DEFINE
+#error Expected FOO_DEFINE
+#endif
+
+#ifndef BAR_DEFINE
+#error Expected Bar_DEFINE
+#endif
+
+#include "commandoutput.h"
+
+#ifndef COMMANDOUTPUT_DEFINE
+#error Expected COMMANDOUTPUT_DEFINE
+#endif
+
+#include "targetoutput.h"
+
+#ifndef TARGETOUTPUT_DEFINE
+#error Expected TARGETOUTPUT_DEFINE
+#endif
+
+#ifdef _WIN32
+__declspec(dllexport)
+#endif
+int bar()
+{
+  return 0;
+}