通过查看centos的更新包，发现已经支持 gcc 32位版本了。
实际上，使用 CentOS-7.0-1406-x86_64-Everything.iso 完整安装文件，CentOS-Media.repo内的配置是
[c7-media]
name=CentOS-$releasever – Media
baseurl=file:///mnt/cdrom/
gpgcheck=1
enabled=1
gpgkey=file:///mnt/cdrom/RPM-GPG-KEY-CentOS-7
完整安装
yum –disablerepo=\* –enablerepo=c7-media install glibc-devel
http://mirrors.hustunique.com/centos/7.0.1406/updates/x86_64/Packages/
对应的文件是:
libstdc++-4.8.2-16.2.el7_0.i686.rpm 18-Aug-2014 21:35 301K
libgcc-4.8.2-16.2.el7_0.i686.rpm 18-Aug-2014 21:34 94K
使用命令查看这两个包，发现有我们需要的文件了。
# rpm -qpl libgcc-4.8.2-16.2.el7_0.i686.rpm
warning: libgcc-4.8.2-16.2.el7_0.i686.rpm: Header V3 RSA/SHA256 Signature, key ID f4a80eb5: NOKEY
/lib/libgcc_s-4.8.2-20140120.so.1
/lib/libgcc_s.so.1
/usr/share/doc/libgcc-4.8.2
/usr/share/doc/libgcc-4.8.2/COPYING
/usr/share/doc/libgcc-4.8.2/COPYING.LIB
/usr/share/doc/libgcc-4.8.2/COPYING.RUNTIME
/usr/share/doc/libgcc-4.8.2/COPYING3
/usr/share/doc/libgcc-4.8.2/COPYING3.LIB
# rpm -qpl libstdc++-4.8.2-16.2.el7_0.i686.rpm
warning: libstdc++-4.8.2-16.2.el7_0.i686.rpm: Header V3 RSA/SHA256 Signature, key ID f4a80eb5: NOKEY
/usr/lib/libstdc++.so.6
/usr/lib/libstdc++.so.6.0.19
/usr/share/gcc-4.8.2
/usr/share/gcc-4.8.2/python
/usr/share/gcc-4.8.2/python/libstdcxx
/usr/share/gcc-4.8.2/python/libstdcxx/__init__.py
/usr/share/gcc-4.8.2/python/libstdcxx/__init__.pyc
/usr/share/gcc-4.8.2/python/libstdcxx/__init__.pyo
/usr/share/gcc-4.8.2/python/libstdcxx/v6
/usr/share/gcc-4.8.2/python/libstdcxx/v6/__init__.py
/usr/share/gcc-4.8.2/python/libstdcxx/v6/__init__.pyc
/usr/share/gcc-4.8.2/python/libstdcxx/v6/__init__.pyo
/usr/share/gcc-4.8.2/python/libstdcxx/v6/printers.py
/usr/share/gcc-4.8.2/python/libstdcxx/v6/printers.pyc
/usr/share/gcc-4.8.2/python/libstdcxx/v6/printers.pyo
/usr/share/gdb
/usr/share/gdb/auto-load
/usr/share/gdb/auto-load/usr
/usr/share/gdb/auto-load/usr/lib
/usr/share/gdb/auto-load/usr/lib/libstdc++.so.6.0.19-gdb.py
/usr/share/gdb/auto-load/usr/lib/libstdc++.so.6.0.19-gdb.pyc
/usr/share/gdb/auto-load/usr/lib/libstdc++.so.6.0.19-gdb.pyo