I have RHEL5 box installed with gcc version 4.1.2. I want to install gcc version 3.4.2 on to that.

I was ablw to install gccV4.3.2, after removing many other packages and isntalling the older versions of the same packages.However, its not successful. I landed corrupting my glibc in the process.

So I would like to know the formal procedure /steps to be followed for replacing my gccV4.1.2 with gccV3.4.2.

Or, Is it possible to have two versions of gcc installed on the same machine. If yes, how can i achieve that and how do I invoke the specific version of compiler during compilation ?

Try uninstall your old version of gcc and compile the old version. You must compile when downgrading. Maybe this page can be of some help finding the right version. I don't exactly know what you need.

https://launchpad.net/+search?field.....search=Search

Or just google for another place to find the sourcecode.

I agree with kk2202.
else
1. get the source code
2. compile it as
./configure --prefix=<your-path>/dir/
3. make ; make install
4. While using use <your-path>/dir/ for older gcc.

By this you don't have to face any dependency problem.

!!
Do not remove the system compiler, you can have all
the compilers, you want, at the same time. !
!!
No need to compile gcc-3.4 , is already available
as a package : 'compat-gcc-34-3.4.6-4'
......and....... 'compat-gcc-34-c++-3.4.6-4

# yum -y install compat-gcc-34 compat-gcc-34-c++

will do.
.....
.....

Using different compilers, examples :
./configure CC=gcc43 CXX=g++34
make CC=gcc43 CXX=g++34
.....