From 74e49aa441e4805b40b5e61348501f9143a5defe Mon Sep 17 00:00:00 2001
From: "Marcus D. Hanwell" <marcus.hanwell@kitware.com>
Date: Fri, 12 Nov 2010 19:43:05 -0500
Subject: [PATCH] BUG 11451 - pass CMAKE_EXTRA_GENERATOR down.

This patch fixes the behavior of external projects with respect to
generators using the CMAKE_EXTRA_GENERATOR variable.
---
 Modules/ExternalProject.cmake | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Modules/ExternalProject.cmake b/Modules/ExternalProject.cmake
index 997164a8e..1be6cfdb8 100644
--- a/Modules/ExternalProject.cmake
+++ b/Modules/ExternalProject.cmake
@@ -1228,7 +1228,12 @@ function(_ep_add_configure_command name)
     if(cmake_generator)
       list(APPEND cmd "-G${cmake_generator}" "${source_dir}")
     else()
-      list(APPEND cmd "-G${CMAKE_GENERATOR}" "${source_dir}")
+      if(CMAKE_EXTRA_GENERATOR)
+        list(APPEND cmd "-G${CMAKE_EXTRA_GENERATOR} - ${CMAKE_GENERATOR}"
+          "${source_dir}")
+      else()
+        list(APPEND cmd "-G${CMAKE_GENERATOR}" "${source_dir}")
+      endif()
     endif()
   endif()