From a704098de83460e8e9bae02434a6c31e7fc3ffd7 Mon Sep 17 00:00:00 2001
From: Ben Boeckel <ben.boeckel@kitware.com>
Date: Thu, 26 Mar 2015 18:12:04 -0400
Subject: ExternalProject: fix the build command for generator overrides

The `binary_dir` variable is never set, so this is invalid. Instead, use
"." which all the other build commands use anyways. Also only set the
--config option if it is meaningful.
---
 Modules/ExternalProject.cmake | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Modules/ExternalProject.cmake b/Modules/ExternalProject.cmake
index d7b985d..0c73d41 100644
--- a/Modules/ExternalProject.cmake
+++ b/Modules/ExternalProject.cmake
@@ -1197,7 +1197,10 @@ function(_ep_get_build_command name step cmd_var)
         else()
           set(cmd "${CMAKE_COMMAND}")
         endif()
-        set(args --build ${binary_dir} --config ${CMAKE_CFG_INTDIR})
+        set(args --build ".")
+        if (CMAKE_CFG_INTDIR AND NOT CMAKE_CFG_INTDIR STREQUAL ".")
+          list(APPEND args --config "${CMAKE_CFG_INTDIR}")
+        endif ()
         if(step STREQUAL "INSTALL")
           list(APPEND args --target install)
         endif()
-- 
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