1. 安装必备
yum groupinstall "Development Tools" yum install glibc-static libstdc++-static
2. 编译安装 gcc
another place recommendated is ustc opensouce mirror https://mirrors.ustc.edu.cn/gnu/gcc/
wget http://ftp.tsukuba.wide.ad.jp/software/gcc/releases/gcc-7.3.0/gcc-7.3.0.tar.gz tar -zxvf gcc-7.3.0 cd gcc-7.3.0 ./contrib/download_prerequisites #安装依赖库,以前升级gcc非常麻烦，因为gcc依赖了mpfr、gmp、mpc 和isl共四个库，下载也麻烦 ，现在简单了 mkdir build cd build #在gcc目录，执行配置命令： ./configure --prefix=/usr/local/gcc7.3.0 --enable-multilib; #如果只需要支持c,c++编译器，则执行配置命令：./configure --prefix=/usr/local/gcc7.3.0 --disable-multilib --enable-languages=c,c++ # –enable-checking=release 增加一些检查，也可以–disable-checking生成的编译器在编译过程中不做额外检查 #–enable-languages=c,c++ 你要让你的gcc支持的编程语言 #–disable-multilib 取消多目标库编译(取消32位库编译) ../configure --prefix=/usr/local/gcc7.3.0 --enable-checking=release --enable-languages=c,c++ --disable-multilib make # or make -j 4 which could determin the parallel compiling job number. make install #here would install to the folder /usr/local/gcc7.3.0 which is specified by argument --prefix
optional step:
uninstall lower version of gcc if you has already installed in the system.
rpm -q gcc #query if gcc has installed rpm -q gcc-c++ #query if gcc-c++ has installed rpm -e {package name which has listed if you have gcc installed, on centos 7, it maybe list as follows} #gcc-4.8.5-16.el7_4.2.x86_64 #gcc-c++-4.8.5-16.el7_4.2.x86_64
3. add gcc to the system path
vim /etc/profile
add the following content at the end of file:
export PATH=$PATH:/usr/local/gcc7.3.0/bin
or just create a soft link to /usr/bin
sudo ln -s /usr/local/gcc7.3.0/bin/gcc /usr/bin/gcc sudo ln -s /usr/local/gcc7.3.0/bin/g++ /usr/bin/g++
4. view the gcc version
gcc --version g++ --version
output:
4. FAQ
/lib64/libstdc++.so.6: version `GLIBCXX_3.4.21’ not found (required
solution:
find / -name libstdc++.so*
output:
/usr/lib64/libstdc++.so.6
/usr/lib64/libstdc++.so.6.0.19
/usr/lib64/libstdc++.so.6.0.24
/usr/share/gdb/auto-load/usr/lib64/libstdc++.so.6.0.19-gdb.py
/usr/share/gdb/auto-load/usr/lib64/libstdc++.so.6.0.19-gdb.pyc
/usr/share/gdb/auto-load/usr/lib64/libstdc++.so.6.0.19-gdb.pyo
/usr/local/lib64/libstdc++.so.6.0.24
/usr/local/lib64/libstdc++.so.6
/usr/local/lib64/libstdc++.so
/usr/local/lib64/libstdc++.so.6.0.24-gdb.py
找到这个这个目录下面的libstdc++.so.6.0.xx,我的是24
cp /usr/local/lib64/libstdc++.so.6.0.24 /usr/lib64 ldconfig #this is required
5. Alternative solution( not recommondated)
5.1 install devtoolset-6
sudo yum install centos-release-scl sudo yum install devtoolset-6 scl enable devtoolset-6 bash sudo yum list devtoolset-6\*
5.2. change default gcc version using command like:
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-6.3 40 sudo update-alternatives --config gcc
if u don't want gcc 6 as your default gcc version, you can enable it just in the current terminal:
scl enable devtoolset-6 bash
