RedHat 7 - GCC Version Problems

[Christos Sotiriou <cxs at dcs dot ed dot ac dot uk>]

 Hello.

 I have found problems trying to compile a program with the g++
 compiler that ships with RedHat Linux 7.0. My program compiles
 fine with the g++ compiler of RedHat 6.2. I realise that the
 g++ version is changed. In my case, some of the warning that
 I was getting now have become errors and the program will
 not compile. I tried using kgcc -x c++ and that seems to work,
 but I get library errors when I link the file.

 My question is this. How can I tell kgcc to use c++ style
 linking? Can I force g++ not to use the ISO/ANSI standards
 so my program will compile like in the earlier versions? I
 tried the options on the man page, such as -traditional, but
 nothing seems to make a difference.

 Linking with kgcc gives me the following errors:
 (Is this because it uses c style linking, rather than c++?)

 /usr/X11R6/lib/libX11.so.6: undefined reference to
`getpwuid_r@GLIBC_2.1.2'
/lib/libpthread.so.0: undefined reference to `__sysctl@GLIBC_2.2'
/lib/libpthread.so.0: undefined reference to `_IO_list_unlock@GLIBC_2.2'
/usr/lib/libGL.so.1: undefined reference to `shmctl@GLIBC_2.2'
/lib/libpthread.so.0: undefined reference to `_IO_iter_file@GLIBC_2.2'
/usr/X11R6/lib/libX11.so.6: undefined reference to
`getpwnam_r@GLIBC_2.1.2'
/lib/libpthread.so.0: undefined reference to `getrlimit@GLIBC_2.2'
/lib/libpthread.so.0: undefined reference to
`_IO_list_resetlock@GLIBC_2.2'
/lib/libpthread.so.0: undefined reference to `_IO_iter_begin@GLIBC_2.2'
/lib/libpthread.so.0: undefined reference to `__libc_sigaction@GLIBC_2.2'
/lib/libpthread.so.0: undefined reference to `_IO_iter_next@GLIBC_2.2'
/lib/libdl.so.2: undefined reference to `_dl_vsym@GLIBC_2.2'
/lib/libpthread.so.0: undefined reference to `_IO_iter_end@GLIBC_2.2'
/lib/libpthread.so.0: undefined reference to `setrlimit@GLIBC_2.2'
/lib/libpthread.so.0: undefined reference to `_IO_list_lock@GLIBC_2.2'
/home/cxs/Qt/qt-2.2.0/lib/libqt.so: undefined reference to
`__res_init@GLIBC_2.2'
/lib/libdl.so.2: undefined reference to `_dl_sym@GLIBC_2.2'
collect2: ld returned 1 exit status

 Any suggestions?

 Thanks for the help.

 Christos Sotiriou.