CentOS 6.7 自帶的gcc版本是4.4.7，不支援c++11，手動升級一下，目前gcc最新版本是5.2

1、下載原始碼包
wget http://mirrors.concertpass.com/gcc/releases/gcc-5.2.0/gcc-5.2.0.tar.bz2

2、解壓
tar jxvf gcc-5.2.0.tar.bz2

3、自動安裝依賴

cd gcc-5.2.0
./contrib/download_prerequisites

4、建立臨時目錄，存放編譯過程中的中間檔案
mkdir gcc-build-5.2.0
cd gcc-build-5.2.0
../configure --enable-checking=release --enable-languages=c,c++ --disable-multilib

5、make

6、sudo make install

7、檢視新的gcc 版本

[[email protected] gcc-build-5.2.0]# gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/x86_64-unknown-linux-gnu/5.2.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../configure --enable-checking=release --enable-languages=c,c++ --disable-multilib
Thread model: posix
gcc version 5.2.0 (GCC) 
[

[email protected] gcc-build-5.2.0]# g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/x86_64-unknown-linux-gnu/5.2.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../configure --enable-checking=release --enable-languages=c,c++ --disable-multilib
Thread model: posix
gcc version 5.2.0 (GCC) 

注意，系統原有的gcc/g++ 在 /usr/bin/gcc、g++  新安裝的gcc在 /usr/local/bin/gcc、g++