From 9f49ac3df0f0324d72daa54e2c005c30f4d74414 Mon Sep 17 00:00:00 2001
From: "Alan W. Irwin" <airwin@users.sourceforge.net>
Date: Mon, 8 Sep 2014 12:24:17 -0700
Subject: [PATCH] ExternalProject: Avoid infinite loop on file download hash
 mismatch

When the loop was added by commit v3.0.0-rc1~103^2~3 (ExternalProject:
Reattempt download when verification fails, 2015-01-15), we forgot to
actually increment the loop counter.  Add the increment line.
---
 Modules/ExternalProject.cmake | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Modules/ExternalProject.cmake b/Modules/ExternalProject.cmake
index 17cb866d3..a1c7629cd 100644
--- a/Modules/ExternalProject.cmake
+++ b/Modules/ExternalProject.cmake
@@ -607,6 +607,7 @@ Retrying download.
     file(REMOVE \"\${file}\")
     execute_process(COMMAND \${CMAKE_COMMAND} -P \"${download_script}\")
   endif()
+  math(EXPR attempt \"\${attempt} + 1\")
 endwhile()
 
 if(\${succeeded})