From 5d739a3c843c95aec6c5c8df4d7e87e606c0c8ea Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Tue, 19 Jan 2016 16:07:28 -0500
Subject: [PATCH] ExternalProject: Simplify `cmake --build` configuration
 passing

Check CMAKE_CONFIGURATION_TYPES instead of CMAKE_CFG_INTDIR in order
to recognize multi-config generators.  Then use $<CONFIG> to pass
the configuration value.
---
 Modules/ExternalProject.cmake | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/Modules/ExternalProject.cmake b/Modules/ExternalProject.cmake
index 5c5c54a79..085aa0d6e 100644
--- a/Modules/ExternalProject.cmake
+++ b/Modules/ExternalProject.cmake
@@ -1230,9 +1230,9 @@ function(_ep_get_build_command name step cmd_var)
           set(cmd "${CMAKE_COMMAND}")
         endif()
         set(args --build ".")
-        if (CMAKE_CFG_INTDIR AND NOT CMAKE_CFG_INTDIR STREQUAL ".")
-          list(APPEND args --config "${CMAKE_CFG_INTDIR}")
-        endif ()
+        if(CMAKE_CONFIGURATION_TYPES)
+          list(APPEND args --config $<CONFIG>)
+        endif()
         if(step STREQUAL "INSTALL")
           list(APPEND args --target install)
         endif()