https://blog.csdn.net/longji/article/details/80400339

01 ubuntu1604desktop_x64 安装gcc8.1.0
系统环境:

gcc版本:gcc version 5.4.0 20160609
build-essential is already the newest version (12.1ubuntu2).
libgmp-dev is already the newest version (2:6.1.0+dfsg-2).
libmpc-dev is already the newest version (1.0.3-1).
libmpfr-dev is already the newest version (3.1.4-1).
The following packages were automatically installed and are no longer required:
libqpdf17 linux-headers-4.4.0-79 linux-headers-4.4.0-79-generic
linux-image-4.4.0-79-generic linux-image-extra-4.4.0-79-generic
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01.01 系统更新及安装依赖
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install build-essential libgmp-dev libmpfr-dev libmpc-dev
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01.02 gcc代码下载及编译
wget ftp://ftp.mirrorservice.org/sites/sourceware.org/pub/gcc/releases/gcc-8.1.0/gcc-8.1.0.tar.xz
tar -Jxvf gcc-8.1.0.tar.xz
cd gcc-8.1.0
./contrib/download_prerequisites
cd ..
mkdir temp_gcc81 && cd temp_gcc81
../gcc-8.1.0/configure --prefix=/usr/local/gcc-8.1 --enable-threads=posix --disable-checking --disable-multilib
make
sudo make install
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01.03 环境配置
设置gcc8.1的安装路径
sudo vim /etc/profile

export PATH="/usr/local/gcc-8.1/bin:$PATH"
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01.04 测试
测试文件test_gcc81.cpp

#include <iostream>
int main(int argc,char** argv)
{
using namespace std;
cout << __cplusplus << endl;
return 0;
}
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01.05 c++2a
编译 g++ --std=c++2a -o tg81 test_gcc81.cpp
运行结果：

./tg81
201709
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01.06 gcc7.2
gcc7.2 在ubuntu1604_x64下的编译方式完全相同。
测试效果:

$ g++ --std=c++2a -o tg72 test_gcc81.cpp
g++: error: unrecognized command line option ‘--std=c++2a’; did you mean ‘--std=c++03’?
$ g++ --std=c++14 -o tg72 test_gcc81.cpp
$ ./tg72
201402
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02 centos7.4x64 上编译安装gcc8.1.0
02.01 系统环境以安装依赖
#默认gcc版本
gcc version 4.8.5 20150623 (Red Hat 4.8.5-16) (GCC)

# 更新系统
sudo yum update
sudo yum upgrade

# 安装gcc编译依赖
sudo yum install gmp-devel mpfr-devel libmpc-devel
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Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
* base: mirrors.cn99.com
* extras: mirrors.aliyun.com
* updates: mirrors.aliyun.com
Package 1:gmp-devel-6.0.0-15.el7.x86_64 already installed and latest version
Package mpfr-devel-3.1.1-4.el7.x86_64 already installed and latest version
Package libmpc-devel-1.0.1-3.el7.x86_64 already installed and latest version
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02.03 下载源码及编译安装
wget ftp://ftp.mirrorservice.org/sites/sourceware.org/pub/gcc/releases/gcc-8.1.0/gcc-8.1.0.tar.xz
tar -Jxvf gcc-8.1.0.tar.xz
mkdir temp_gcc81 && cd temp_gcc81
../gcc-8.1.0/configure --prefix=/usr/local/gcc-8.1 --enable-threads=posix --disable-checking --disable-multilib
make
sudo make install
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02.03 测试效果:
$cat test_gcc81.cpp
#include <iostream>
int main(int argc,char** argv)
{
using namespace std;
cout << __cplusplus << endl;
return 0;
}

$g++ --std=c++2a -o tg81 test_gcc81.cpp
$./tg81
201709
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作者：longji
来源：CSDN
原文：https://blog.csdn.net/longji/article/details/80400339
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