centos64位编译32位程序

test.c

#include <stdio.h>
int main()
{
        printf("sizeof long is %d\n",sizeof(long));
        return ;
}

64位编译

[swdn@dev desktop]$ gcc test.c
[swdn@dev desktop]$ file a.out
a.out: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.18, not stripped
[swdn@dev desktop]$ 

32位编译

[swdn@dev desktop]$ gcc -m32 test.c

错误1：缺少32位头文件

解决方法：

[swdn@dev desktop]$ yum install glibc.i686

错误2：再次编译，发现编译成功，链接失败，提示如下错误

解决方法：

先查看64位文件版本

[swdn@dev desktop]$ yum list libgcc
已加载插件：fastestmirror, refresh-packagekit, security
Loading mirror speeds from cached hostfile
 * base: mirrors.aliyun.com
 * extras: mirrors.aliyun.com
 * updates: mirrors.aliyun.com
已安装的软件包
libgcc.x86_64                                                                      4.8.-.el6                                                                        @hop5  

由于yum提供的32版本低于64位的版本，使用yum install libgcc.i686会安装失败，因此需自己下载32位版本进行安装

下载地址：https://pkgs.org/download/libgcc

安装libgcc.i686

[swdn@dev desktop]$ sudo rpm -ivh libgcc-4.8.-.el7.i686.rpm

安装完成后重新编译程序

[swdn@dev desktop]$ gcc -m32 test.c
[swdn@dev desktop]$ file a.out
a.out: ELF -bit LSB executable, Intel , version  (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6., not stripped
[swdn@dev desktop]$ a.out
sizeof long is
[swdn@dev desktop]$

显示已经可以编译32位程序了。