centos：安装gcc g++

1. 当前环境

$ uname -r
3.10.0-514.el7.x86_64

2. 检查g++、gcc是否安装

[oceanstar@localhost ~]$  g++ -v
bash: g++: 未找到命令...
[oceanstar@localhost ~]$ gcc -v
bash: gcc: 未找到命令...

看这里，按照g++ 11，下面不用看了
G++支持的C++版本

安装

安装g++7以上

默认yum安装的是4.8.5，如果想要g++7以上：

  On Ubuntu try the following:

      sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y
      sudo apt-get update -y
      sudo apt-get install g++-7 -y

  On CentOS try the following:

      sudo yum install centos-release-scl
      sudo yum install devtoolset-7
      scl enable devtoolset-7 bash

yum默认安装

1. 开始安装

[oceanstar@localhost ~]$ su
[root@localhost run]$   yum -y install gcc gcc-c++ kernel-devel

2. 查看是否安装成功

[root@localhost run]# gcc -v
使用内建 specs。
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/4.8.5/lto-wrapper
目标：x86_64-redhat-linux
配置为：../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-linker-hash-style=gnu --enable-languages=c,c++,objc,obj-c++,java,fortran,ada,go,lto --enable-plugin --enable-initfini-array --disable-libgcj --with-isl=/builddir/build/BUILD/gcc-4.8.5-20150702/obj-x86_64-redhat-linux/isl-install --with-cloog=/builddir/build/BUILD/gcc-4.8.5-20150702/obj-x86_64-redhat-linux/cloog-install --enable-gnu-indirect-function --with-tune=generic --with-arch_32=x86-64 --build=x86_64-redhat-linux
线程模型：posix
gcc 版本 4.8.5 20150623 (Red Hat 4.8.5-44) (GCC) 

[root@localhost run]# g++ -v
使用内建 specs。
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/4.8.5/lto-wrapper
目标：x86_64-redhat-linux
配置为：../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-linker-hash-style=gnu --enable-languages=c,c++,objc,obj-c++,java,fortran,ada,go,lto --enable-plugin --enable-initfini-array --disable-libgcj --with-isl=/builddir/build/BUILD/gcc-4.8.5-20150702/obj-x86_64-redhat-linux/isl-install --with-cloog=/builddir/build/BUILD/gcc-4.8.5-20150702/obj-x86_64-redhat-linux/cloog-install --enable-gnu-indirect-function --with-tune=generic --with-arch_32=x86-64 --build=x86_64-redhat-linux
线程模型：posix
gcc 版本 4.8.5 20150623 (Red Hat 4.8.5-44) (GCC) 

3. 查看安装在哪里

[root@localhost run]# which g++
/usr/bin/g++
[root@localhost run]# which gcc
/usr/bin/gcc

ubuntu安装

sudo apt-get install build-essential