From 15062f3443e12de421d8a526f26a0dbd813d34a6 Mon Sep 17 00:00:00 2001
From: Brian Bockelman <bbockelm@cse.unl.edu>
Date: Tue, 6 Aug 2013 18:32:53 -0500
Subject: [PATCH] Add a cmake option for disabling usage of atomics.

Without this, if a platform has atomics support detected, there isn't
any simple way for a developer to disable them for debugging purposes.
---
 cmake/XRootDSystemCheck.cmake | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/cmake/XRootDSystemCheck.cmake b/cmake/XRootDSystemCheck.cmake
index 0c741c60dbb..36247dcb7f6 100644
--- a/cmake/XRootDSystemCheck.cmake
+++ b/cmake/XRootDSystemCheck.cmake
@@ -118,4 +118,8 @@ check_cxx_source_runs(
   }
 "
 HAVE_ATOMICS )
-compiler_define_if_found( HAVE_ATOMICS HAVE_ATOMICS )
+option(EnableAtomicsIfPresent "EnableAtomicsIfPresent" ON)
+if ( EnableAtomicsIfPresent )
+  compiler_define_if_found( HAVE_ATOMICS HAVE_ATOMICS )
+endif ()
+