Background:
The highest version of the existing centos7 gcc is 4.8.5 The project needs to be upgraded to 7.1.0 or above The upgrade can be done in the normal way with the following commands:
$ sudo yum install centos-release-scl $ sudo yum install devtoolset-7-gcc* $ scl enable devtoolset-7 bash
Note: The third instructionscl enable devtoolset-7It just upgrades gcc in the current session, if you want to upgrade gcc automatically every time you log in, you can set thescl enable devtoolset-7put together ~/.bash_profile Documentation.
But recently centos official mirror can not be accessed normally, and aliyun and other domestic yum cloud does not seem to have the latest gcc version of the mirror, so you need to manually compile the way to install gcc The following version 7.5.0 as an example, if you need a higher version of the method is the same.
Upload to the server /usr/local directory
Execute the command to decompress
$ tar -zxvf ./gcc-7.5.0.tar.gz $ cd gcc-7.5.0
The normal procedure is to run . /contrib/download_prerequisites to download the dependencies, but because of network problems, you can't download them directly, so you need to manually go to the website and upload them to the server at :
/pub/gcc/infrastructure/
Execute the command vim . /contrib/download_prerequisites
Open . /contrib/download_prerequisites to see the specific versions of the dependencies. There are four files, namely
gmp='gmp-6.1..bz2' mpfr='mpfr-3.1..bz2' mpc='mpc-1.0.' isl='isl-0.16..bz2'
Download it and import it into the /usr/local/gcc-7.5.0 directory.
Install lbzip2 (decompression tool)
$ yum install -y lbzip2
execute a command
$ ./contrib/download_prerequisites
Configuration and Compilation
$ mkdir build $ cd build $ ../configure --prefix=/usr/local/gcc-7.5.0 --enable-languages=c,c++ --disable-multilib $ make -j$(nproc) $ sudo make install
Updating the PATH
$ export PATH=/usr/local/gcc-7.5.0/bin:$PATH
connect the aboveexport PATH command is added to your~/.bashrc maybe~/.bash_profile file to make it permanent.
$ gcc --version