Detailed process of upgrading gcc (version 10.2.0) under CentOS7 environment

Short Introduction
1. Check the current gcc version
2. Download the gcc installation package (version 10.2.0)
3. Unzip the installation package
4. Download dependent libraries
5. The installation system must include modules
6. Create a compilation directory
7. Generate Makefile

illustrate:

8. Compile

9. Installation

10. Configure libstdc++.so

11. Configure environment variables

Summarize

Short Introduction

Hello everyone, today I will share with you how to upgrade the gcc compiler. The Linux system actually comes with a built-in gcc compiler, but the version is relatively low. Currently, some open source tools such as Apache Doris require a higher version of the gcc 5.3.1+ compiler to compile C++ code during installation. Then let's understand how to upgrade gcc (from 4.8.5 to 10.2.0).

1. Check the current gcc version

## Check the current system gcc version. Default is 4.8.5g++ -v or gcc --version

2. Download the gcc installation package (version 10.2.0)

## Download address: http://ftp.gnu.org/gnu/gcc## Download via wget command under linux wget http://ftp.gnu.org/gnu/gcc/gcc-10.2.0/gcc-10.2.0.tar.gz

3. Unzip the installation package

tar -xvf gcc-10.2.0.tar.gz## Unzip directory gcc-10.2.0

4. Download dependent libraries

## Enter the unzipped directory and download the dependency library cd gcc-10.2.0./contrib/download_prerequisites

5. The installation system must include modules

yum install -y gcc-c++ libstdc++-static ant cmake byacc flex automake libtool binutils-devel bison ncurses-devel gcc kernel-devel libtool libatomic

6. Create a compilation directory

## Create a compilation directory in the same directory as gcc-10.2.0. The name is: gcc-build-10.2.0mkdir ../gcc-build-10.2.0

7. Generate Makefile

## Enter the compilation directory, execute the command, and generate the Makefile file cd gcc-build-10.2.0../gcc-10.2.0/configure --enable-checking=release --enable-languages=c,c++ --disable-multilib

illustrate:

If an error message is displayed, configure: error: Building GCC requires GMP 4.2+, MPFR 3.1.0+ and MPC 0.8.0+.

You need to delete the dependency package downloaded in step 4 and then execute it again. The correct packet sizes are as follows:

8. Compile

#Execute the command to compile. Here, 4 jobs are used. The compilation time is about 40 minutes. This value should not be set too high. make -j4 ## It is recommended to use nohup & execution, which is really slow.

9. Installation

make install ## It is recommended to use nohup & to execute. It takes about 2 minutes to complete

10. Configure libstdc++.so

## Verify whether libstdc++.so exists in the compilation directory (gcc-build-10.2.0) find . -name "libstdc++.so*"

## Enter the libstdc++.so configuration directory cd /usr/lib64 ## Copy the new libstdc++.so to the directory cp /root/gcc-build-10.2.0/stage1-x86_64-pc-linux-gnu/libstdc++-v3/src/.libs/libstdc++.so.6.0.28 . ## Backup mv libstdc++.so.6 libstdc++.so.6.old ## Create a new soft link ln -sv libstdc++.so.6.0.28 libstdc++.so.6

11. Configure environment variables

## Uninstall the old version 4.8.5yum remove gcc gcc-c++## Enter the root directorycd ~## Edit the current user environment variablevim .bash_profile## ContentPATH=$PATH:$HOME/bin:/usr/local/bin/export CC=/usr/local/bin/gccexport CXX=/usr/local/bin/g++## Take effect immediatelysource ~/.bash_profile## Verify gcc --version

Summarize

During the gcc upgrade process, various module or package missing problems may occur. You need to install them one by one. In fact, this is also related to the Linux system environment itself. So don’t be afraid if you have problems, just solve them. I believe you can do it.

Finally, a small script for overall installation is attached

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