From ec3dad54b3bc1442ef1ae49db7c1c92d643a45e9 Mon Sep 17 00:00:00 2001
From: Simon Heybrock <simon.heybrock@esss.se>
Date: Wed, 3 May 2017 09:24:41 +0200
Subject: [PATCH] Re #19470. Add 14.04 linker options required for
 std::call_once.

---
 Framework/Indexing/CMakeLists.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Framework/Indexing/CMakeLists.txt b/Framework/Indexing/CMakeLists.txt
index d997bb0d6018..005b9c9132a9 100644
--- a/Framework/Indexing/CMakeLists.txt
+++ b/Framework/Indexing/CMakeLists.txt
@@ -69,6 +69,12 @@ set_property ( TARGET Indexing PROPERTY FOLDER "MantidFramework" )
 
 target_link_libraries ( Indexing LINK_PRIVATE ${TCMALLOC_LIBRARIES_LINKTIME} ${MANTIDLIBS} )
 
+if( "${UNIX_CODENAME}" STREQUAL "trusty" )
+  # Special linking options are required for some older Ubuntu gcc builds to use std::thread, specific options found here:
+  # http://stackoverflow.com/questions/8649828/what-is-the-correct-link-options-to-use-stdthread-in-gcc-under-linux#comment35723468_8649908
+  target_link_libraries ( Indexing LINK_PRIVATE -Wl,--no-as-needed -pthread )
+endif()
+
 # Add the unit tests directory
 add_subdirectory ( test )