From ec00e89e83eeb91633affd662870b7a6955dbf5a Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Tue, 19 Jan 2016 16:09:29 -0500
Subject: [PATCH] ExternalProject: Fix TEST_BEFORE_INSTALL for multi-config
 generators

In multi-config generators we must tell `ctest` what configuration to
test.

Reported-by: Taylor Braun-Jones <taylor@braun-jones.org>
---
 Modules/ExternalProject.cmake | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Modules/ExternalProject.cmake b/Modules/ExternalProject.cmake
index 085aa0d6e..7070dc470 100644
--- a/Modules/ExternalProject.cmake
+++ b/Modules/ExternalProject.cmake
@@ -1240,6 +1240,9 @@ function(_ep_get_build_command name step cmd_var)
         if("x${step}x" STREQUAL "xTESTx")
           string(REGEX REPLACE "^(.*/)cmake([^/]*)$" "\\1ctest\\2" cmd "${cmd}")
           set(args "")
+          if(CMAKE_CONFIGURATION_TYPES)
+            list(APPEND args -C $<CONFIG>)
+          endif()
         endif()
       endif()
     else()