centos6.5安装gcc6.1等c++环境

1、获取gcc安装包并解压
wget http://ftp.gnu.org/gnu/gcc/gcc-6.1.0/gcc-6.1.0.tar.bz2
tar -jxvf gcc-6.1.0.tar.bz2

2、下载供编译需求的依赖项
执行download_prerequisites将会自动下载这些软件并解压到当前目录，生成gcc编译的make文件。自动安装gcc需要下载诸如gmp、mpfr、mpc等依赖文件，
cd gcc-6.1.0　
./contrib/download_prerequisites　
如果你的Linux无法直接联网，那么你只能打开文件download_prerequisites，获取到这些文件的下载链接，然后通过其他上网设备下载这些软件。最后把这些软件直接解压到gcc源程序目录(/路径/6.1.0)下即可。

3、建立一个目录供编译出的文件存放
mkdir gcc-build-6.1.0; cd gcc-build-6.1.0

../configure -enable-checking=release -enable-languages=c,c++ -disable-multilib

make -j4编译的时候老是出错，改用make成功编译
-j4选项是make对多核处理器的优化，如果不成功请使用 make

6 安装gcc
make install

7 验证安装

gcc -v

截至目前，GCC 6.1.0编译安装了，但还需要替换系统的链接库：/usr/lib/libstdc++.so.6

拷贝文件到目录下：cp /usr/local/lib64/libstdc++.so.6.0.22 /usr/lib64/，进入lib目录：cd /usr/lib64,删除原来的文件：rm libstdc++.so.6,

重新建立软连接：ln libstdc++.so.6.0.17 libstdc++.so.6 。替换完成

附:　

GCC 6.1 发布了，该版本较之前GCC5 新怎了大量的功能特性，默认采用C++14为新的标准，替代了之前的C++98。OpenMP 4.5规范将在本版本中被支持。此外，GCC 6.1 增强了对 C++17 的试验性支持；大大改进了诊断特性，包括位置，位置范围，拼写错误标识符建议，选项名字等等改进；新增了修复提示和一些警告提示。改进记录如下：

UndefinedBehaviorSanitizer gained a new sanitization option, -fsanitize=bounds-strict, which enables strict checking of array bounds. In particular, it enables -fsanitize=bounds as well as instrumentation of flexible array member-like arrays.
Type-based alias analysis now disambiguates accesses to different pointers. This improves precision of the alias oracle by about 20-30% on higher-level C++ programs. Programs doing invalid type punning of pointer types may now need -fno-strict-aliasing to work correctly.
Alias analysis now correctly supports weakref and alias attributes. This makes it possible to access both a variable and its alias in one translation unit which is common with link-time optimization.
Value range propagation now assumes that the this pointer of C++ member functions is non-null. This eliminates common null pointer checks but also breaks some non-conforming code-bases (such as Qt-5, Chromium, KDevelop). As a temporary work-around-fno-delete-null-pointer-checks can be used. Wrong code can be identified by using-fsanitize=undefined.

完整发布说明，可以在这里查看。