Multiple GCC versions in LINUX

Multiple GCC versions of LINUX-general Linux technology-Linux programming and kernel information. For details, refer to the following section. I am currently using UBUNTU 8.04. Because I have been upgrading LINUX recently, my GCC is also getting higher now, which is 4.2.3. The following prompt appears when I compile the CROSSTOOL on hand:

Checking for a BSD-compatible install.../usr/bin/install-c
Checking whether ln-s works... yes
Checking for pwd.../bin/pwd
Checking for arm-linux-gcc... gcc
Checking version of gcc... 4.2.3, bad
Checking for gnumake... no
Checking for gmake... no
Checking for make... make
Checking version of make... 3.81, OK
Configure: error:
*** These critical programs are missing or too old: gcc
* ** Check the INSTALL file for required versions.

So I need to press my current GCC version to the previous status 3.4. First of all, you need to go to your usr/bin/to see if there is a gcc-3.4 such a file, if not, install it:

Apt-get install gcc-3.4

Then, you need to delete the gcc file under the usr/bin/directory or avoid exceptions. you can name it gcc. bak. Here you need to note that if you do not delete it, you will find that your use of ln-s/usr/bin/gcc-3.4/usr/bin/gcc always does not work. In fact, when you use gcc-v to view the current version, you always use usr/bin/gcc. The purpose of ln-s/usr/bin/gcc-3.4/usr/bin/gcc is to generate gcc version 3.4. In one sentence, you only need to execute:

Rm/usr/bin/gcc
Ln-s/usr/bin/gcc-3.4/usr/bin/gcc

Then gcc-v can see that the current version is 3.4. If you want to use the current 4.2.3, use the same method:

Rm/usr/bin/gcc
Ln-s/usr/bin/gcc-4.2.3/usr/bin/gcc

Then let's determine the gcc-v version. Good luck.