Hi,

I need to compile a program that requires gcc 4.2. I tried a few things but maybe I am missing something. How can I install gcc 4.2?

Thanks

Hi,

instead of using an old compiler, can you not fix the code?

Evo2.

You can get your desired compiler from here
Bur before doing anything with compiler, you should read this.

The default 4.x's for Ubuntu 12.04 :
sudo apt-get install g++-4.4 g++-4.5 g++-4.6

GCC 4.1.2, post #3 here ..
http://www.linuxquestions.org/questi...-4175450625/#3

Example building gcc-4.3 on Ubuntu 12.**, post #2 here ..
http://www.linuxquestions.org/questi...-4175452215/#2

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Post # 3 :

No, pavi_kanetkar, you cannot configure gcc that way :
gcc requires a build directory outside the source directory.
+ "a lot of configure options"
Example: http://www.linuxquestions.org/questi...-4175452215/#2

And : Extra gcc's are always configured with option --program-suffix=<version>,
like : --program-suffix=42 : To insure no conflict with other installed gcc's.

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But I have downgraded my compiler version using this.
First I removed my latest compiler which was 4.4.5
then I downloaded and installed 4.2.2, and if I run gcc -v
it shows
gcc version 4.2.2

# 6 .

No reason ever to remove the system compiler.
You can have as many version of gcc as you want, installed at the same time.

As well as I have used multiple versions of gcc.
I gave the correct PATH (export PATH)and used the desired version.

Yes, Removing the old version is dangerous as it could cause you to kill dependancies for the distribution provided packages on your system.
I am just telling, it is possible.

What is current version of your compiler.
If you are using ubuntu 12.04, may be you are using gcc-4.6.3.

As ubuntu version is increased, they drop the older version for installation and it is not possible to install it using apt-get.
You have to download the package and install it manually.
Ubuntu maintains the repository and you can download the deb file from here but I doubt your dependencies will support it.

If you install it using ./configure, make & make install, Do not remove older version. It will create an older version gcc file in /usr/bin.
You can set the path of your needed file and it will shift on your needed gcc version.

If you see in /usr/bin there is file named gcc, it is a linked file (not in centOS), if you follow the path, it is in same directory which is your current version of gcc.
You can set here your compiler if you find gcc-4.2 in /usr/bin but do not do this just use export to use your needed version.

I was telling you how does it work.