From 6d85a6a64c6919c07d983b584bb74f6a29cddac5 Mon Sep 17 00:00:00 2001
From: Stephen Kelly <steveire@gmail.com>
Date: Fri, 7 Feb 2014 15:31:57 +0100
Subject: [PATCH] add_library: Issue better diagnostic for INTERFACE GLOBAL
 signature.

---
 Source/cmAddLibraryCommand.cxx                             | 7 +++++++
 .../interface_library/invalid_signature-stderr.txt         | 2 +-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/Source/cmAddLibraryCommand.cxx b/Source/cmAddLibraryCommand.cxx
index a29f78420..009b1caa4 100644
--- a/Source/cmAddLibraryCommand.cxx
+++ b/Source/cmAddLibraryCommand.cxx
@@ -173,6 +173,13 @@ bool cmAddLibraryCommand
       ++s;
       importGlobal = true;
       }
+    else if(type == cmTarget::INTERFACE_LIBRARY && *s == "GLOBAL")
+      {
+      cmOStringStream e;
+      e << "GLOBAL option may only be used with IMPORTED libraries.";
+      this->SetError(e.str().c_str());
+      return false;
+      }
     else
       {
       break;
diff --git a/Tests/RunCMake/interface_library/invalid_signature-stderr.txt b/Tests/RunCMake/interface_library/invalid_signature-stderr.txt
index 701586a8d..6374b3392 100644
--- a/Tests/RunCMake/interface_library/invalid_signature-stderr.txt
+++ b/Tests/RunCMake/interface_library/invalid_signature-stderr.txt
@@ -84,6 +84,6 @@ Call Stack \(most recent call first\):
   CMakeLists.txt:3 \(include\)
 +
 CMake Error at invalid_signature.cmake:20 \(add_library\):
-  add_library INTERFACE library requires no source arguments.
+  add_library GLOBAL option may only be used with IMPORTED libraries.
 Call Stack \(most recent call first\):
   CMakeLists.txt:3 \(include\)