By looking at the centos update package, we found that the gcc version has been supported .
http://mirrors.hustunique.com/centos/7.0.1406/updates/x86_64/Packages/
The corresponding files are :
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
Use the command to view the two packages and find the files we need.
# 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
CentOS 7 already supports GCC compiling 32-bit programs