Gcc版本手动编译升级
[root@localhost yilai]# gcc --version
安装gmp-4.3.2
[root@localhost gcc-build]#tar -xjvf gmp-4.3.2.tar.bz2
[root@localhost gcc-build]# cd gmp-4.3.2
[root@localhost gcc-build]#mkdir gmp-build
[root@localhost gcc-build]#cd gmp-build
[root@localhost gcc-build]#../configure --prefix=/usr/local/gmp-4.3.2
[root@localhost gcc-build]#make
[root@localhost gcc-build]#make install
安装mpfr-2.4.2
[root@localhost gcc-build]#tar -xjvf mpfr-2.4.2.tar.bz2
[root@localhost gcc-build]#cd mpfr-2.4.2
[root@localhost gcc-build]#mkdir mpfr-build
[root@localhost gcc-build]#cd mpfr-build
[root@localhost gcc-build]#../configure --prefix=/usr/local/mpfr-2.4.2 --with-gmp=/usr/local/gmp-4.3.2
[root@localhost gcc-build]#make
[root@localhost gcc-build]#make install
安装mpc-0.8.1.tar.gz
[root@localhost gcc-build]#tar -xzvf mpc-0.8.1.tar.gz
[root@localhost gcc-build]#cd mpc-0.8.1
[root@localhost gcc-build]#mkdir mpc-build
[root@localhost gcc-build]#cd mpc-build
[root@localhost gcc-build]#../configure --prefix=/usr/local/mpc-0.8.1 --with-gmp=/usr/local/gmp-4.3.2 --with-mpfr=/usr/local/mpfr-2.4.2
[root@localhost gcc-build]#make && make install
添加环境变量
[root@localhost mpc-build]# vim /etc/profile
LD_LIBRARY_PATH加入以下内容
:/usr/local/gmp-4.3.2/lib:/usr/local/mpc-0.8.1/lib:/usr/local/mpfr-2.4.2/lib:/usr/local/gcc-5.4.0/lib
安装gcc-5.4.0
[root@localhost gcc-build]#tar -xzvf gcc-5.4.0.tar.gz
[root@localhost gcc-build]#cd gcc-5.4.0
[root@localhost gcc-build]#mkdir gcc-build
[root@localhost gcc-build]#cd gcc-build
[root@localhost gcc-build]#../configure --prefix=/usr/local/gcc-5.4.0 --enable-threads=posix --disable-checking --disable-multilib --enable-languages=c,c++ --with-gmp=/usr/local/gmp-4.3.2 --with-mpfr=/usr/local/mpfr-2.4.2 --with-mpc=/usr/local/mpc-0.8.1
[root@localhost gcc-build]#make && make install
执行该编译时间非常长，超过2小时。
备份旧版本
[root@localhost gcc-build]# mv /usr/bin/gcc gcc_4.8.5back
[root@localhost gcc-build]# mv /usr/bin/g++ g++_4.8.5back
调用新版本
[root@localhost gcc-build]# ln -s /usr/local/gcc-5.4.0/bin/gcc /usr/bin/gcc
[root@localhost gcc-build]# ln -s /usr/local/gcc-5.4.0/bin/g++ /usr/bin/g++
查看更新版本
[root@localhost gcc-build]# gcc -v
