今天在某台64位LInux下编译一个简单的hello world的C程序，报错：
/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../crt1.o: could not read symbols: File in wrong format
查看该文件的格式，竟然是32位的：
# file /usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../crt1.o
/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../crt1.o: ELF 32-bit LSB relocatable, Intel 80386, version 1 (SYSV), for GNU/Linux 2.6.18, not stripped
查看glibc-devel版本：
# yum info glibc-devel
Installed Packages
Name: glibc-devel
Arch: i686
Version : 2.12
Release : 1.149.el6_6.5
Size: 955 k
Repo: installed
From repo : 6ASU5-updates
Summary : Object files for development using standard C libraries.
URL : http://sources.redhat.com/glibc/
License : LGPLv2+ and LGPLv2+ with exceptions and GPLv2+
Description : The glibc-devel package contains the object files necessary
: for developing programs which use the standard C libraries (which are
: used by nearly all programs). If you are developing programs which
: will use the standard C libraries, your system needs to have these
: standard object files available in order to create the
: executables.
:
: Install glibc-devel if you are going to develop programs which will
: use the standard C libraries.
Available Packages
Name: glibc-devel
Arch: x86_64
Version : 2.12
Release : 1.149.el6_6.5
Size: 983 k
Repo: 6ASU5-updates
Summary : Object files for development using standard C libraries.
URL : http://sources.redhat.com/glibc/
License : LGPLv2+ and LGPLv2+ with exceptions and GPLv2+
Description : The glibc-devel package contains the object files necessary
: for developing programs which use the standard C libraries (which are
: used by nearly all programs). If you are developing programs which
: will use the standard C libraries, your system needs to have these
: standard object files available in order to create the
: executables.
:
: Install glibc-devel if you are going to develop programs which will
: use the standard C libraries.
在其他正常的64位机器上，发现是有/usr/lib64/crt1.o文件的，而问题机器却没有改文件，只有/usr/lib/crt1.o文件。
询问牛人，牛人用了以下命令查看正常机器上的crt1.o文件：
# rpm -qf /usr/lib64/crt1.o
glibc-devel-2.12-1.149.el6_6.5.x86_64
原来是问题机器只安装了glibc-devel.i686，没有安装glibc-devel.x86_64，用yum安装即可：
yum install glibc-devel.x86_64
安装成功后，一切正常！