本文主要是介绍centos8默认不安装g++的解决方法，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
今天使用VSCode编写C++文件，发现始终找不到vector头文件，即使配置好了头文件搜索路径也无济于事。
网上一查，原来是CentOS 8 / RHEL 8 默认没有G++的编译器，只安装了GCC编译器。
[root@VM-12-14-centos ~]# gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/8/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-redhat-linux
Configured with: ../configure --enable-bootstrap --enable-languages=c,c++,fortran,lto --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-shared --enable-threads=posix --enable-checking=release --enable-multilib --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-gcc-major-version-only --with-linker-hash-style=gnu --enable-plugin --enable-initfini-array --with-isl --disable-libmpx --enable-offload-targets=nvptx-none --without-cuda-driver --enable-gnu-indirect-function --enable-cet --with-tune=generic --with-arch_32=x86-64 --build=x86_64-redhat-linux
Thread model: posix问题发现
查看是否安装G++，显示未安装。
[root@VM-12-14-centos ~]# g++ -v
-bash: g++: command not found安装G++编译器
用yum安装，命令如下：
[root@VM-12-14-centos ~]# yum install gcc-c++
Last metadata expiration check: 0:26:56 ago on Sun 18 Apr 2021 03:42:03 PM CST.
Dependencies resolved.
==========================================================================================================================================================================Package Architecture Version Repository Size
==========================================================================================================================================================================
Installing:gcc-c++ x86_64 8.3.1-5.1.el8 AppStream 12 M
Upgrading:cpp x86_64 8.3.1-5.1.el8 AppStream 10 Mgcc x86_64 8.3.1-5.1.el8 AppStream 23 Mlibgcc x86_64 8.3.1-5.1.el8 BaseOS 78 klibgomp x86_64 8.3.1-5.1.el8 BaseOS 204 klibstdc++ x86_64 8.3.1-5.1.el8 BaseOS 451 k
Installing dependencies:libstdc++-devel x86_64 8.3.1-5.1.el8 AppStream 2.0 MTransaction Summary
==========================================================================================================================================================================
Install 2 Packages
Upgrade 5 PackagesTotal download size: 49 M
Is this ok [y/N]: y
Downloading Packages:
(1/7): libstdc++-devel-8.3.1-5.1.el8.x86_64.rpm 9.0 MB/s | 2.0 MB 00:00
(2/7): cpp-8.3.1-5.1.el8.x86_64.rpm 23 MB/s | 10 MB 00:00
(3/7): libgcc-8.3.1-5.1.el8.x86_64.rpm 5.0 MB/s | 78 kB 00:00
(4/7): libgomp-8.3.1-5.1.el8.x86_64.rpm 10 MB/s | 204 kB 00:00
(5/7): libstdc++-8.3.1-5.1.el8.x86_64.rpm 14 MB/s | 451 kB 00:00
(6/7): gcc-c++-8.3.1-5.1.el8.x86_64.rpm 18 MB/s | 12 MB 00:00
(7/7): gcc-8.3.1-5.1.el8.x86_64.rpm 38 MB/s | 23 MB 00:00
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total 57 MB/s | 49 MB 00:00
Running transaction check
Transaction check succeeded.检查
安装完后检查是否成功，显示已成功安装。
[root@VM-12-14-centos ~]# g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/8/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-redhat-linux
Configured with: ../configure --enable-bootstrap --enable-languages=c,c++,fortran,lto --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-shared --enable-threads=posix --enable-checking=release --enable-multilib --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-gcc-major-version-only --with-linker-hash-style=gnu --enable-plugin --enable-initfini-array --with-isl --disable-libmpx --enable-offload-targets=nvptx-none --without-cuda-driver --enable-gnu-indirect-function --enable-cet --with-tune=generic --with-arch_32=x86-64 --build=x86_64-redhat-linux
Thread model: posix
gcc version 8.3.1 20191121 (Red Hat 8.3.1-5) (GCC) 大家好，我是柠檬哥。
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