From 10da1267eb437e93a3162bca7711cfa061c2b004 Mon Sep 17 00:00:00 2001
From: Andrea Bocci <fwyzard@gmail.com>
Date: Wed, 29 Oct 2014 14:31:40 +0100
Subject: [PATCH] disable LTO for biglibs with gcc 4.9.x

---
 BigProducts/Simulation/BuildFile.xml | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/BigProducts/Simulation/BuildFile.xml b/BigProducts/Simulation/BuildFile.xml
index 8ccf6c3da752f..dc0e65bb5555b 100644
--- a/BigProducts/Simulation/BuildFile.xml
+++ b/BigProducts/Simulation/BuildFile.xml
@@ -19,7 +19,10 @@
 <use name="SimDataFormats/ValidationFormats"/>
 <use name="geant4static"/>
 <flags DROP_DEP="geant4core"/>
-# Hack needed to avoid undefined variable in CLHEP.
 <architecture name="slc6_amd64_gcc49">
+  # hack needed to avoid undefined variable in CLHEP.
   <flags REM_CXXFLAGS="-Werror=unused-variable"/>
+  # disable LTO in BigLibs, as it seems to clash with debugging symbols with gcc 4.9.x
+  <flags REM_BIGOBJ_CXXFLAGS="-flto"/>
+  <flags BIGOBJ_CXXFLAGS="-fno-lto"/>
 </architecture>