安装gcc套件

命令 ： yum install gcc

起因今天在centos 7环境中安装python3时有如下提示：

```
[root@localhost Python-3.7.5]# ./config
config.guess  config.sub    configure   
[root@localhost Python-3.7.5]# ./configure 
checking build system type... x86_64-pc-linux-gnu
checking host system type... x86_64-pc-linux-gnu
checking for python3.7... no
checking for python3... no
checking for python... python
checking for --enable-universalsdk... no
checking for --with-universal-archs... no
checking MACHDEP... checking for --without-gcc... no
checking for --with-icc... no
checking for gcc... no
checking for cc... no
checking for cl.exe... no
configure: error: in `/data/softpackage/Python-3.7.5':
configure: error: no acceptable C compiler found in $PATH
See `config.log' for more details
[root@localhost Python-3.7.5]#

```

重点是 ：configure: error: no acceptable C compiler found in $PATH  这一行，表明了没有C在环境变量中

运行上边安装命令会有输入 提示 统一输入y（偷懒默认就同意就可以了）

```
[root@localhost Python-3.7.5]# yum install gcc
Loaded plugins: fastestmirror
Determining fastest mirrors
 * base: mirrors.tuna.tsinghua.edu.cn
 * extras: mirrors.tuna.tsinghua.edu.cn
 * updates: mirrors.tuna.tsinghua.edu.cn
base                                                                       | 3.6 kB  00:00:00

.................

glibc-common             x86_64           2.17-292.el7                   base               11 M
 libgcc                   x86_64           4.8.5-39.el7                   base              102 k
 libgomp                  x86_64           4.8.5-39.el7                   base              158 k

Transaction Summary
==================================================================================================
Install  1 Package  (+6 Dependent packages)
Upgrade             ( 4 Dependent packages)

Total download size: 48 M
Is this ok [y/d/N]:

...................

(10/11): gcc-4.8.5-39.el7.x86_64.rpm                                       |  16 MB  00:00:04   
Public key for kernel-headers-3.10.0-1062.4.1.el7.x86_64.rpm is not installed 47 MB  00:00:00 ETA 
(11/11): kernel-headers-3.10.0-1062.4.1.el7.x86_64.rpm                     | 8.7 MB  00:00:02   
--------------------------------------------------------------------------------------------------
Total                                                             9.0 MB/s |  48 MB  00:00:05   
Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
Importing GPG key 0xF4A80EB5:
 Userid     : "CentOS-7 Key (CentOS 7 Official Signing Key) <security@centos.org>"
 Fingerprint: 6341 ab27 53d7 8a78 a7c2 7bb1 24c6 a8a7 f4a8 0eb5
 Package    : centos-release-7-6.1810.2.el7.centos.x86_64 (@anaconda)
 From       : /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
Is this ok [y/N]:

........

Verifying  : glibc-2.17-260.el7.x86_64                                                    12/15 
  Verifying  : libgomp-4.8.5-36.el7.x86_64                                                  13/15 
  Verifying  : glibc-common-2.17-260.el7.x86_64                                             14/15 
  Verifying  : libgcc-4.8.5-36.el7.x86_64                                                   15/15

Installed:
  gcc.x86_64 0:4.8.5-39.el7

Dependency Installed:
  cpp.x86_64 0:4.8.5-39.el7                   glibc-devel.x86_64 0:2.17-292.el7              
  glibc-headers.x86_64 0:2.17-292.el7         kernel-headers.x86_64 0:3.10.0-1062.4.1.el7    
  libmpc.x86_64 0:1.0.1-3.el7                 mpfr.x86_64 0:3.1.1-4.el7

Dependency Updated:
  glibc.x86_64 0:2.17-292.el7    glibc-common.x86_64 0:2.17-292.el7  libgcc.x86_64 0:4.8.5-39.el7 
  libgomp.x86_64 0:4.8.5-39.el7

Complete!

```

安装gcc套件

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安装gcc套件

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