Linux gcc

1、通过gcc -v命令检查gcc的安装

  1. ➜  ~ gcc -v
  2. Using built-in specs.
  3. COLLECT_GCC=gcc
  4. COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/4.8.5/lto-wrapper
  5. Target: x86_64-redhat-linux
  6. 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
  7. Thread model: posix
  8. gcc version 4.8.5 20150623 (Red Hat 4.8.5-11) (GCC)

2、gcc安装升级

➜  / yum -y install devtoolset-9-gcc devtoolset-9-gcc-c++ devtoolset-9-binutils
➜  / gcc -v
➜  / scl enable devtoolset-9 bash
➜  / echo "source /opt/rh/devtoolset-9/enable" >> /etc/profile
➜  / gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/opt/rh/devtoolset-9/root/usr/libexec/gcc/x86_64-redhat-linux/9/lto-wrapper
Target: x86_64-redhat-linux
Configured with: ../configure --enable-bootstrap --enable-languages=c,c++,fortran,lto --prefix=/opt/rh/devtoolset-9/root/usr --mandir=/opt/rh/devtoolset-9/root/usr/share/man --infodir=/opt/rh/devtoolset-9/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-9.3.1-20200408/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 9.3.1 20200408 (Red Hat 9.3.1-2) (GCC)

如果遇到安装gcc不能在yum源找到包的问题，可参考如下

CentOS7.3-yum安装源找不到包解决办法

3、一键式安装升级gcc脚本

wget http://people.centos.org/tru/devtools-2/devtools-2.repo -O /etc/yum.repos.d/devtools-2.repo
cd /etc/yum.repos.d/
rm -rf devtools-2.repo
yum -y install centos-release-scl
yum -y install devtoolset-9-gcc devtoolset-9-gcc-c++ devtoolset-9-binutils
rpm -qa|grep devtoolset
scl enable devtoolset-9 bash
gcc -v
g++ -v

安装后检查gcc版本不正确的问题修复

gcc安装时，只对当前连接的用户生效，在当前执行安装操作的用户查看gcc的安装路径，执行which gcc，登录新会话时gcc又显示默认的版本了，可以通过配置别名的方式进行修复

vim ~/.bashrc

#添加以下配置
alias gcc='/opt/rh/devtoolset-9/root/usr/bin/gcc'
alias g++='/opt/rh/devtoolset-9/root/usr/bin/g++'

source ~/.bashrc 
gcc -v
g++ -v

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