前言
centos7直接yum安装的那个gcc版本为4.8.5，对于大多数的需求来说都是低了。
现在最新的版本可能到9了，9.2 9.3的安装教程我在网上都搜到过，但是似乎9的版本都需要make和make install？编译时间得小半天吧，有时候还会有各种奇怪的报错。所以要求不是特别严格的话可以看看8.3.1版本，我不是很清楚它和这种费时巨大的在使用的时候会不会缺胳膊少腿的，但是我目前用着还行。
sudo yum install centos-release-scl sudo yum install devtoolset-8-gcc* scl enable devtoolset-8 bash source /opt/rh/devtoolset-8/enable
后边执行mv命令的时候如果报错不用太过惊慌，这几句是用来替换掉直接安装的4.8.5版本的，但是没安装4.8.5软链接建立的命令也还是要执行的。
mv /usr/bin/gcc /usr/bin/gcc-4.8.5 ln -s /opt/rh/devtoolset-8/root/bin/gcc /usr/bin/gcc mv /usr/bin/g++ /usr/bin/g++-4.8.5 ln -s /opt/rh/devtoolset-8/root/bin/g++ /usr/bin/g++ mv /usr/bin/c++ /usr/bin/c++-4.8.5 ln -s /opt/rh/devtoolset-8/root/bin/c++ /usr/bin/c++
后边执行mv命令的时候如果报错不用太过惊慌，这几句是用来替换掉直接安装的4.8.5版本的，但是没安装4.8.5软链接建立的命令也还是要执行的。
mv /usr/bin/gcc /usr/bin/gcc-4.8.5 ln -s /opt/rh/devtoolset-8/root/bin/gcc /usr/bin/gcc mv /usr/bin/g++ /usr/bin/g++-4.8.5 ln -s /opt/rh/devtoolset-8/root/bin/g++ /usr/bin/g++ mv /usr/bin/c++ /usr/bin/c++-4.8.5 ln -s /opt/rh/devtoolset-8/root/bin/c++ /usr/bin/c++
可以查看一下版本看看了
gcc --version g++ --version c++ --version
如过在使用时出现如/usr/lib64/libstdc++.so.6: version `CXXABI_1.3.8’ not found这样的报错
拷入libstdc++.so.6.0.26在/usr/lib64下
mv libstdc++.so.6.0.26 /usr/lib64 cd /usr/lib64 rm -rf libstdc++.so.6 ln -s libstdc++.so.6.0.26 libstdc++.so.6
bstdc++.so.6.0.26放到百度网盘里了
链接: https://pan.baidu.com/s/1UEunOZKGL9z3_BU-V6mK0A?pwd=e1a1
提取码: e1a1
再放两个我之前用过的比较费时的9.2版本安装教程
https://blog.csdn.net/weixin_30994847/article/details/112821626
https://blog.csdn.net/RyanFang/article/details/100927373
如果安装的时候显示g++显示没有可用的包
sudo yum install gcc-c++
ubuntu16.04安装gcc-8 g++8.0
https://blog.csdn.net/dream_for_/article/details/117201988
GCC 命令行详解 -L 指定库的路径 -l 指定需连接的库名
https://blog.csdn.net/abc5382334/article/details/45049735
嵌入式Linux文件IO，GCC编译流程及参数分析，静态库创建和使用，ar crs libhello.a hello.o创建静态库,nm查看静态库中符号信息
https://blog.csdn.net/m0_37542524/article/details/83754738# Centos7快速安装gcc8.3.1 可支持C++17（附gcc相关链接整理）
实际手操：
直接贴命令行
[zryTest@master ~]$ [zryTest@master ~]$ [zryTest@master ~]$ ls bin conf data log src [zryTest@master ~]$ cd src/ [zryTest@master src]$ ls ReadFileDemo-2.cpp ReadFileDemo-3.cpp ReadFileDemo-4.cpp [zryTest@master src]$ g++ ReadFileDemo-4.cpp -o Test-4 ReadFileDemo-4.cpp:6:22: fatal error: filesystem: No such file or directory #include <filesystem> ^ compilation terminated. [zryTest@master src]$ g++ ReadFileDemo-4.cpp -o Test-4 -std=c++17 g++: error: unrecognized command line option ‘-std=c++17’ [zryTest@master src]$ g++ ReadFileDemo-4.cpp -o Test-4 -std=C++17 g++: error: unrecognized command line option ‘-std=C++17’ [zryTest@master src]$ g++ -version g++: error: unrecognized command line option ‘-version’ g++: fatal error: no input files compilation terminated. [zryTest@master src]$ g++ -ver g++: error: unrecognized command line option ‘-ver’ g++: fatal error: no input files compilation terminated. [zryTest@master src]$ g++ version g++: error: version: No such file or directory g++: fatal error: no input files compilation terminated. [zryTest@master src]$ ls /usr/bin/gcc* -l -rwxr-xr-x 2 root root 768608 Sep 30 2020 /usr/bin/gcc -rwxr-xr-x 1 root root 27088 Sep 30 2020 /usr/bin/gcc-ar -rwxr-xr-x 1 root root 27088 Sep 30 2020 /usr/bin/gcc-nm -rwxr-xr-x 1 root root 27088 Sep 30 2020 /usr/bin/gcc-ranlib [zryTest@master src]$ rpm -qa|grep gcc gcc-gfortran-4.8.5-44.el7.x86_64 gcc-c++-4.8.5-44.el7.x86_64 libgcc-4.8.5-44.el7.x86_64 gcc-4.8.5-44.el7.x86_64 [zryTest@master src]$ man gcc [zryTest@master src]$ [zryTest@master src]$ man gcc [zryTest@master src]$ [zryTest@master src]$ g++: error: unrecognized command line option ‘-ver’ -bash: g++:: command not found [zryTest@master src]$ sudo yum install centos-release-scl Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: mirrors.huaweicloud.com * epel: mirrors.tuna.tsinghua.edu.cn * extras: mirrors.tuna.tsinghua.edu.cn * updates: mirrors.huaweicloud.com clickhouse-stable/signature | 833 B 00:00:00 Retrieving key from https://packages.clickhouse.com/rpm/stable/repodata/repomd.xml.key clickhouse-stable/signature | 3.0 kB 00:00:01 !!! https://packages.clickhouse.com/rpm/stable/repodata/repomd.xml: [Errno -1] repomd.xml signature could not be verified for clickhouse-stable Trying other mirror. Resolving Dependencies --> Running transaction check ---> Package centos-release-scl.noarch 0:2-3.el7.centos will be installed --> Processing Dependency: centos-release-scl-rh for package: centos-release-scl-2-3.el7.centos.noarch --> Running transaction check ---> Package centos-release-scl-rh.noarch 0:2-3.el7.centos will be installed --> Finished Dependency Resolution Dependencies Resolved =============================================================================================================== Package Arch Version Repository Size =============================================================================================================== Installing: centos-release-scl noarch 2-3.el7.centos extras 12 k Installing for dependencies: centos-release-scl-rh noarch 2-3.el7.centos extras 12 k Transaction Summary =============================================================================================================== Install 1 Package (+1 Dependent package) Total download size: 24 k Installed size: 39 k Is this ok [y/d/N]: y Downloading packages: (1/2): centos-release-scl-2-3.el7.centos.noarch.rpm | 12 kB 00:00:00 (2/2): centos-release-scl-rh-2-3.el7.centos.noarch.rpm | 12 kB 00:00:00 --------------------------------------------------------------------------------------------------------------- Total 110 kB/s | 24 kB 00:00:00 Running transaction check Running transaction test Transaction test succeeded Running transaction Installing : centos-release-scl-rh-2-3.el7.centos.noarch 1/2 Installing : centos-release-scl-2-3.el7.centos.noarch 2/2 Verifying : centos-release-scl-2-3.el7.centos.noarch 1/2 Verifying : centos-release-scl-rh-2-3.el7.centos.noarch 2/2 Installed: centos-release-scl.noarch 0:2-3.el7.centos Dependency Installed: centos-release-scl-rh.noarch 0:2-3.el7.centos Complete! [zryTest@master src]$ [zryTest@master src]$ [zryTest@master src]$ sudo yum install devtoolset-8-gcc* Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: mirrors.huaweicloud.com * centos-sclo-rh: mirrors.huaweicloud.com * centos-sclo-sclo: mirrors.huaweicloud.com * epel: mirrors.tuna.tsinghua.edu.cn * extras: mirrors.tuna.tsinghua.edu.cn * updates: mirrors.huaweicloud.com centos-sclo-rh | 3.0 kB 00:00:00 centos-sclo-sclo | 3.0 kB 00:00:00 clickhouse-stable/signature | 833 B 00:00:00 Retrieving key from https://packages.clickhouse.com/rpm/stable/repodata/repomd.xml.key clickhouse-stable/signature | 3.0 kB 00:00:01 !!! https://packages.clickhouse.com/rpm/stable/repodata/repomd.xml: [Errno -1] repomd.xml signature could not be verified for clickhouse-stable Trying other mirror. (1/2): centos-sclo-sclo/x86_64/primary_db | 300 kB 00:00:00 (2/2): centos-sclo-rh/x86_64/primary_db | 3.4 MB 00:00:00 Resolving Dependencies --> Running transaction check ---> Package devtoolset-8-gcc.x86_64 0:8.3.1-3.2.el7 will be installed --> Processing Dependency: devtoolset-8-binutils >= 2.22.52.0.1 for package: devtoolset-8-gcc-8.3.1-3.2.el7.x86_64 --> Processing Dependency: devtoolset-8-runtime for package: devtoolset-8-gcc-8.3.1-3.2.el7.x86_64 ---> Package devtoolset-8-gcc-c++.x86_64 0:8.3.1-3.2.el7 will be installed --> Processing Dependency: devtoolset-8-libstdc++-devel = 8.3.1-3.2.el7 for package: devtoolset-8-gcc-c++-8.3.1-3.2.el7.x86_64 ---> Package devtoolset-8-gcc-gdb-plugin.x86_64 0:8.3.1-3.2.el7 will be installed ---> Package devtoolset-8-gcc-gfortran.x86_64 0:8.3.1-3.2.el7 will be installed --> Processing Dependency: devtoolset-8-libquadmath-devel = 8.3.1-3.2.el7 for package: devtoolset-8-gcc-gfortran-8.3.1-3.2.el7.x86_64 --> Processing Dependency: libgfortran5 >= 8.1.1 for package: devtoolset-8-gcc-gfortran-8.3.1-3.2.el7.x86_64 ---> Package devtoolset-8-gcc-plugin-devel.x86_64 0:8.3.1-3.2.el7 will be installed --> Processing Dependency: gmp-devel >= 4.1.2-8 for package: devtoolset-8-gcc-plugin-devel-8.3.1-3.2.el7.x86_64 --> Processing Dependency: libmpc-devel >= 0.8.1 for package: devtoolset-8-gcc-plugin-devel-8.3.1-3.2.el7.x86_64 --> Processing Dependency: mpfr-devel >= 2.2.1 for package: devtoolset-8-gcc-plugin-devel-8.3.1-3.2.el7.x86_64 --> Running transaction check ---> Package devtoolset-8-binutils.x86_64 0:2.30-55.el7.2 will be installed ---> Package devtoolset-8-libquadmath-devel.x86_64 0:8.3.1-3.2.el7 will be installed ---> Package devtoolset-8-libstdc++-devel.x86_64 0:8.3.1-3.2.el7 will be installed ---> Package devtoolset-8-runtime.x86_64 0:8.1-1.el7 will be installed --> Processing Dependency: scl-utils >= 20120927-11 for package: devtoolset-8-runtime-8.1-1.el7.x86_64 ---> Package gmp-devel.x86_64 1:6.0.0-15.el7 will be installed ---> Package libgfortran5.x86_64 0:8.3.1-2.1.1.el7 will be installed ---> Package libmpc-devel.x86_64 0:1.0.1-3.el7 will be installed ---> Package mpfr-devel.x86_64 0:3.1.1-4.el7 will be installed --> Running transaction check ---> Package scl-utils.x86_64 0:20130529-19.el7 will be installed --> Finished Dependency Resolution Dependencies Resolved =============================================================================================================== Package Arch Version Repository Size =============================================================================================================== Installing: devtoolset-8-gcc x86_64 8.3.1-3.2.el7 centos-sclo-rh 30 M devtoolset-8-gcc-c++ x86_64 8.3.1-3.2.el7 centos-sclo-rh 12 M devtoolset-8-gcc-gdb-plugin x86_64 8.3.1-3.2.el7 centos-sclo-rh 123 k devtoolset-8-gcc-gfortran x86_64 8.3.1-3.2.el7 centos-sclo-rh 12 M devtoolset-8-gcc-plugin-devel x86_64 8.3.1-3.2.el7 centos-sclo-rh 1.4 M Installing for dependencies: devtoolset-8-binutils x86_64 2.30-55.el7.2 centos-sclo-rh 5.5 M devtoolset-8-libquadmath-devel x86_64 8.3.1-3.2.el7 centos-sclo-rh 155 k devtoolset-8-libstdc++-devel x86_64 8.3.1-3.2.el7 centos-sclo-rh 2.7 M devtoolset-8-runtime x86_64 8.1-1.el7 centos-sclo-rh 20 k gmp-devel x86_64 1:6.0.0-15.el7 base 181 k libgfortran5 x86_64 8.3.1-2.1.1.el7 base 796 k libmpc-devel x86_64 1.0.1-3.el7 base 32 k mpfr-devel x86_64 3.1.1-4.el7 base 68 k scl-utils x86_64 20130529-19.el7 base 24 k Transaction Summary =============================================================================================================== Install 5 Packages (+9 Dependent packages) Total download size: 65 M Installed size: 188 M Is this ok [y/d/N]: y Downloading packages: warning: /var/cache/yum/x86_64/7/centos-sclo-rh/packages/devtoolset-8-binutils-2.30-55.el7.2.x86_64.rpm: Header V4 RSA/SHA1 Signature, key ID f2ee9d55: NOKEY Public key for devtoolset-8-binutils-2.30-55.el7.2.x86_64.rpm is not installed (1/14): devtoolset-8-binutils-2.30-55.el7.2.x86_64.rpm | 5.5 MB 00:00:00 (2/14): devtoolset-8-gcc-c++-8.3.1-3.2.el7.x86_64.rpm | 12 MB 00:00:00 (3/14): devtoolset-8-gcc-gdb-plugin-8.3.1-3.2.el7.x86_64.rpm | 123 kB 00:00:00 (4/14): devtoolset-8-gcc-gfortran-8.3.1-3.2.el7.x86_64.rpm | 12 MB 00:00:00 (5/14): devtoolset-8-gcc-8.3.1-3.2.el7.x86_64.rpm | 30 MB 00:00:01 (6/14): devtoolset-8-libquadmath-devel-8.3.1-3.2.el7.x86_64.rpm | 155 kB 00:00:00 (7/14): devtoolset-8-libstdc++-devel-8.3.1-3.2.el7.x86_64.rpm | 2.7 MB 00:00:00 (8/14): devtoolset-8-runtime-8.1-1.el7.x86_64.rpm | 20 kB 00:00:00 (9/14): libgfortran5-8.3.1-2.1.1.el7.x86_64.rpm | 796 kB 00:00:00 (10/14): gmp-devel-6.0.0-15.el7.x86_64.rpm | 181 kB 00:00:00 (11/14): libmpc-devel-1.0.1-3.el7.x86_64.rpm | 32 kB 00:00:00 (12/14): mpfr-devel-3.1.1-4.el7.x86_64.rpm | 68 kB 00:00:00 (13/14): scl-utils-20130529-19.el7.x86_64.rpm | 24 kB 00:00:00 (14/14): devtoolset-8-gcc-plugin-devel-8.3.1-3.2.el7.x86_64.rpm | 1.4 MB 00:00:00 --------------------------------------------------------------------------------------------------------------- Total 32 MB/s | 65 MB 00:00:02 Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-SIG-SCLo Importing GPG key 0xF2EE9D55: Userid : "CentOS SoftwareCollections SIG (https://wiki.centos.org/SpecialInterestGroup/SCLo) <security@centos.org>" Fingerprint: c4db d535 b1fb ba14 f8ba 64a8 4eb8 4e71 f2ee 9d55 Package : centos-release-scl-rh-2-3.el7.centos.noarch (@extras) From : /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-SIG-SCLo Is this ok [y/N]: y Running transaction check Running transaction test Transaction test succeeded Running transaction Installing : 1:gmp-devel-6.0.0-15.el7.x86_64 1/14 Installing : mpfr-devel-3.1.1-4.el7.x86_64 2/14 Installing : libmpc-devel-1.0.1-3.el7.x86_64 3/14 Installing : scl-utils-20130529-19.el7.x86_64 4/14 Installing : devtoolset-8-runtime-8.1-1.el7.x86_64 5/14 Installing : devtoolset-8-libstdc++-devel-8.3.1-3.2.el7.x86_64 6/14 Installing : devtoolset-8-binutils-2.30-55.el7.2.x86_64 7/14 Installing : libgfortran5-8.3.1-2.1.1.el7.x86_64 8/14 Installing : devtoolset-8-gcc-8.3.1-3.2.el7.x86_64 9/14 Installing : devtoolset-8-libquadmath-devel-8.3.1-3.2.el7.x86_64 10/14 Installing : devtoolset-8-gcc-gfortran-8.3.1-3.2.el7.x86_64 11/14 Installing : devtoolset-8-gcc-c++-8.3.1-3.2.el7.x86_64 12/14 Installing : devtoolset-8-gcc-plugin-devel-8.3.1-3.2.el7.x86_64 13/14 Installing : devtoolset-8-gcc-gdb-plugin-8.3.1-3.2.el7.x86_64 14/14 Verifying : libgfortran5-8.3.1-2.1.1.el7.x86_64 1/14 Verifying : devtoolset-8-gcc-c++-8.3.1-3.2.el7.x86_64 2/14 Verifying : scl-utils-20130529-19.el7.x86_64 3/14 Verifying : devtoolset-8-libstdc++-devel-8.3.1-3.2.el7.x86_64 4/14 Verifying : devtoolset-8-runtime-8.1-1.el7.x86_64 5/14 Verifying : devtoolset-8-gcc-gfortran-8.3.1-3.2.el7.x86_64 6/14 Verifying : devtoolset-8-gcc-8.3.1-3.2.el7.x86_64 7/14 Verifying : 1:gmp-devel-6.0.0-15.el7.x86_64 8/14 Verifying : libmpc-devel-1.0.1-3.el7.x86_64 9/14 Verifying : devtoolset-8-gcc-plugin-devel-8.3.1-3.2.el7.x86_64 10/14 Verifying : devtoolset-8-libquadmath-devel-8.3.1-3.2.el7.x86_64 11/14 Verifying : mpfr-devel-3.1.1-4.el7.x86_64 12/14 Verifying : devtoolset-8-binutils-2.30-55.el7.2.x86_64 13/14 Verifying : devtoolset-8-gcc-gdb-plugin-8.3.1-3.2.el7.x86_64 14/14 Installed: devtoolset-8-gcc.x86_64 0:8.3.1-3.2.el7 devtoolset-8-gcc-c++.x86_64 0:8.3.1-3.2.el7 devtoolset-8-gcc-gdb-plugin.x86_64 0:8.3.1-3.2.el7 devtoolset-8-gcc-gfortran.x86_64 0:8.3.1-3.2.el7 devtoolset-8-gcc-plugin-devel.x86_64 0:8.3.1-3.2.el7 Dependency Installed: devtoolset-8-binutils.x86_64 0:2.30-55.el7.2 devtoolset-8-libquadmath-devel.x86_64 0:8.3.1-3.2.el7 devtoolset-8-libstdc++-devel.x86_64 0:8.3.1-3.2.el7 devtoolset-8-runtime.x86_64 0:8.1-1.el7 gmp-devel.x86_64 1:6.0.0-15.el7 libgfortran5.x86_64 0:8.3.1-2.1.1.el7 libmpc-devel.x86_64 0:1.0.1-3.el7 mpfr-devel.x86_64 0:3.1.1-4.el7 scl-utils.x86_64 0:20130529-19.el7 Complete! [zryTest@master src]$ scl enable devtoolset-8 bash [zryTest@master src]$ source /opt/rh/devtoolset-8/enable [zryTest@master src]$ mv /usr/bin/gcc /usr/bin/gcc-4.8.5 mv: cannot move ‘/usr/bin/gcc’ to ‘/usr/bin/gcc-4.8.5’: Permission denied [zryTest@master src]$ ln -s /opt/rh/devtoolset-8/root/bin/gcc /usr/bin/gcc ln: failed to create symbolic link ‘/usr/bin/gcc’: File exists [zryTest@master src]$ su - Password: Last login: Tue Mar 21 10:10:14 CST 2023 on pts/1 [root@master ~]# mv /usr/bin/gcc /usr/bin/gcc-4.8.5 [root@master ~]# ln -s /opt/rh/devtoolset-8/root/bin/gcc /usr/bin/gcc [root@master ~]# mv /usr/bin/g++ /usr/bin/g++-4.8.5 [root@master ~]# [root@master ~]# [root@master ~]# [root@master ~]# [root@master ~]# ln -s /opt/rh/devtoolset-8/root/bin/g++ /usr/bin/g++ [root@master ~]# gcc -v Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/opt/rh/devtoolset-8/root/usr/libexec/gcc/x86_64-redhat-linux/8/lto-wrapper Target: x86_64-redhat-linux Configured with: ../configure --enable-bootstrap --enable-languages=c,c++,fortran,lto --prefix=/opt/rh/devtoolset-8/root/usr --mandir=/opt/rh/devtoolset-8/root/usr/share/man --infodir=/opt/rh/devtoolset-8/root/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 --with-default-libstdcxx-abi=gcc4-compatible --enable-plugin --enable-initfini-array --with-isl=/builddir/build/BUILD/gcc-8.3.1-20190311/obj-x86_64-redhat-linux/isl-install --disable-libmpx --enable-gnu-indirect-function --with-tune=generic --with-arch_32=x86-64 --build=x86_64-redhat-linux Thread model: posix gcc version 8.3.1 20190311 (Red Hat 8.3.1-3) (GCC) [root@master ~]# g++ -v Using built-in specs. COLLECT_GCC=g++ COLLECT_LTO_WRAPPER=/opt/rh/devtoolset-8/root/usr/libexec/gcc/x86_64-redhat-linux/8/lto-wrapper Target: x86_64-redhat-linux Configured with: ../configure --enable-bootstrap --enable-languages=c,c++,fortran,lto --prefix=/opt/rh/devtoolset-8/root/usr --mandir=/opt/rh/devtoolset-8/root/usr/share/man --infodir=/opt/rh/devtoolset-8/root/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 --with-default-libstdcxx-abi=gcc4-compatible --enable-plugin --enable-initfini-array --with-isl=/builddir/build/BUILD/gcc-8.3.1-20190311/obj-x86_64-redhat-linux/isl-install --disable-libmpx --enable-gnu-indirect-function --with-tune=generic --with-arch_32=x86-64 --build=x86_64-redhat-linux Thread model: posix gcc version 8.3.1 20190311 (Red Hat 8.3.1-3) (GCC) [root@master ~]# c++ -v Using built-in specs. COLLECT_GCC=c++ COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/4.8.5/lto-wrapper Target: x86_64-redhat-linux Configured with: ../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 Thread model: posix gcc version 4.8.5 20150623 (Red Hat 4.8.5-44) (GCC) [root@master ~]# mv /usr/bin/c++ /usr/bin/c++-4.8.5 [root@master ~]# ln -s /opt/rh/devtoolset-8/root/bin/c++ /usr/bin/c++ [root@master ~]# c++ -v Using built-in specs. COLLECT_GCC=c++ COLLECT_LTO_WRAPPER=/opt/rh/devtoolset-8/root/usr/libexec/gcc/x86_64-redhat-linux/8/lto-wrapper Target: x86_64-redhat-linux Configured with: ../configure --enable-bootstrap --enable-languages=c,c++,fortran,lto --prefix=/opt/rh/devtoolset-8/root/usr --mandir=/opt/rh/devtoolset-8/root/usr/share/man --infodir=/opt/rh/devtoolset-8/root/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 --with-default-libstdcxx-abi=gcc4-compatible --enable-plugin --enable-initfini-array --with-isl=/builddir/build/BUILD/gcc-8.3.1-20190311/obj-x86_64-redhat-linux/isl-install --disable-libmpx --enable-gnu-indirect-function --with-tune=generic --with-arch_32=x86-64 --build=x86_64-redhat-linux Thread model: posix gcc version 8.3.1 20190311 (Red Hat 8.3.1-3) (GCC) [root@master ~]#
可以看到，这里的 gcc、 g++、c++、的版本已经到了8.3.1 2019版本了。
接下来再次通过 man g++ 查看 -std的介绍文档依旧 保持不变，尝试更新man 手册 [[Linux 更新man说明手册，man中文手册]]
但是，再次使用g++ 编译已经解决库找不到的问题了。 并且 -std=c17、-std=C++17已经可以识别出来了。
分享一个有趣的 学习链接：https://xxetb.xet.tech/s/HY8za
