From ab3543e35ee84ebbf9fe8c11eda7318f01ab7515 Mon Sep 17 00:00:00 2001
From: xuwei06 <xuwei06@baidu.com>
Date: Fri, 16 Mar 2018 14:29:49 -0700
Subject: [PATCH] Fix compilation for gcc5.4

The error is:

paddle/fluid/operators/math/concat.cc:47:72: error: invalid initialization of non-const reference of type 'paddle::platform::CPUPlace&' from an rvalue of type 'paddle::platform::CPUPlace'
   auto& cpu_place = boost::get<platform::CPUPlace>(context.GetPlace());

Should not use reference for cpu_place.
---
 paddle/fluid/operators/math/concat.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/paddle/fluid/operators/math/concat.cc b/paddle/fluid/operators/math/concat.cc
index b54214341..b672c79af 100644
--- a/paddle/fluid/operators/math/concat.cc
+++ b/paddle/fluid/operators/math/concat.cc
@@ -44,7 +44,7 @@ class ConcatFunctor<platform::CPUDeviceContext, T> {
       out_cols += t_cols;
       input_cols[i] = t_cols;
     }
-    auto& cpu_place = boost::get<platform::CPUPlace>(context.GetPlace());
+    auto cpu_place = boost::get<platform::CPUPlace>(context.GetPlace());
 
     // computation
     for (int k = 0; k < out_rows; ++k) {
@@ -87,7 +87,7 @@ class ConcatGradFunctor<platform::CPUDeviceContext, T> {
       input_cols += t_cols;
       output_cols[i] = t_cols;
     }
-    auto& cpu_place = boost::get<platform::CPUPlace>(context.GetPlace());
+    auto cpu_place = boost::get<platform::CPUPlace>(context.GetPlace());
 
     // computation
     for (int k = 0; k < input_rows; ++k) {
-- 
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