From 9270cd6e55651b8715e9369a7f6bf2d6e9c5abc6 Mon Sep 17 00:00:00 2001
From: Matt McCormick <matt.mccormick@kitware.com>
Date: Mon, 6 May 2013 12:30:56 +0000
Subject: [PATCH] ExternalProject: Allow blank SVN_USERNAME and blank
 SVN_PASSWORD.

With

  SVN_USERNAME ""
  SVN_PASSWORD ""

in an ExternalProject_Add() call, the blank username and password
will be passed to the svn checkout/update step commands.
---
 Modules/ExternalProject.cmake | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/Modules/ExternalProject.cmake b/Modules/ExternalProject.cmake
index 40e14d5..6afdb97 100644
--- a/Modules/ExternalProject.cmake
+++ b/Modules/ExternalProject.cmake
@@ -1251,10 +1251,10 @@ function(_ep_add_download_command name)
     get_filename_component(work_dir "${source_dir}" PATH)
     set(comment "Performing download step (SVN checkout) for '${name}'")
     set(svn_user_pw_args "")
-    if(svn_username)
+    if(DEFINED svn_username)
       set(svn_user_pw_args ${svn_user_pw_args} "--username=${svn_username}")
     endif()
-    if(svn_password)
+    if(DEFINED svn_password)
       set(svn_user_pw_args ${svn_user_pw_args} "--password=${svn_password}")
     endif()
     if(svn_trust_cert)
@@ -1473,10 +1473,10 @@ function(_ep_add_update_command name)
     get_property(svn_password TARGET ${name} PROPERTY _EP_SVN_PASSWORD)
     get_property(svn_trust_cert TARGET ${name} PROPERTY _EP_SVN_TRUST_CERT)
     set(svn_user_pw_args "")
-    if(svn_username)
+    if(DEFINED svn_username)
       set(svn_user_pw_args ${svn_user_pw_args} "--username=${svn_username}")
     endif()
-    if(svn_password)
+    if(DEFINED svn_password)
       set(svn_user_pw_args ${svn_user_pw_args} "--password=${svn_password}")
     endif()
     if(svn_trust_cert)
-- 
1.8.1.5