CentOS7安装升级gcc8.3.0

https://mirrors.ustc.edu.cn/gnu/gcc/

# 安装基础依赖包
yum install -y gcc gcc-c++ gcc-gnat libgcc libgcc.i686 glibc-devel bison flex texinfo build-essential zlib-devel bzip2 file texinfo m4 openssl-devel openssl-libs openssl boost

# 解压安装包
tar -zxvf gcc-8.3.0.tar.gz
cd gcc-8.3.0/

## 下载安装依赖环境
./contrib/download_prerequisites


## 编译安装gcc
mkdir /usr/lib/gcc/x86_64-redhat-linux/8.3.0
mkdir build
cd build
 ../configure --prefix=/usr/lib/gcc/x86_64-redhat-linux/8.3.0/ --enable-checking=release --enable-languages=c,c++ --disable-multilib
 
 make -j4 && make install
 
 
 # 配置环境变量
 echo "export PATH=/usr/lib/gcc/x86_64-redhat-linux/8.3.0/bin:\$PATH" >>/etc/profile
 source /etc/profile
 gcc -v
 
 ## 备份原有gcc
 mv /usr/bin/gcc{,.bak}

升级openssl

https://www.openssl.org/source/

# 下贼openssl
wget https://www.openssl.org/source/openssl-1.1.1a.tar.gz
tar -zxvf openssl-1.1.1a.tar.gz
cd openssl-1.1.1a

# 编译安装
./config --prefix=/usr/local/openssl no-zlib # 不需要zlib
make
make install

# 备份原配置
mv /usr/bin/openssl /usr/bin/openssl.bak
mv /usr/include/openssl/ /usr/include/openssl.bak

# 新版配置
ln -s /usr/local/openssl/include/openssl /usr/include/openssl
ln -s /usr/local/openssl/lib/libssl.so.1.1 /usr/local/lib64/libssl.so
ln -s /usr/local/openssl/bin/openssl /usr/bin/openssl

# 修改系统配置
## 写入openssl库文件的搜索路径
echo "/usr/local/openssl/lib" >> /etc/ld.so.conf
## 使修改后的/etc/ld.so.conf生效 
ldconfig -v

# 查看openssl版本
openssl version