Programming

Hi,
I'm new, here, and I'm searching for a simple solution for a simple problem.

I'm working on RedHat 4.4.6-4 through a CentOS Virtual Machine and due to some reasons I must compile my C++ codes with these two different g++ versions: 4.4.6 and 4.2.2.

The fact is that I should be able to use a particular compiler of the two, depending on what I have to do. There's a way to select each time the proper g++ version within the compiling command by the UNIX bash shell? Are there some additional string for this purpose?

Thank's!

How are you compiling? make ? If you don't override the variables in the makefile itself, you can do:

Code:

CC="/usr/bin/gcc-4.1.2" CXX="/usr/bin/g++-4.1.2" make

If they're things that generate makefiles from ./configure, you have to do

Code:

CC="/usr/bin/gcc-4.1.2" CXX="/usr/bin/g++-4.1.2" ./configure

The first problem is installation of the two versions. That means there are 2 versions of executables available - usually in /usr/bin. (Like corona shows). Plus, the necessary library versions must exist in /usr/lib.

The simple solutuion to the problem is to create 2 development boxes; you can create virtual RH installs sitting on top of an x86 box with virtual box software (free), for instance. Install the compiler you need, compile & link the code statically (statically only if the librarties do not exist on production boxes), and then push it to production.

However based on your question wording it sounds like you need some sysadmin help, first. Find out what you have installed.

Maybe yes, I need more informations from the admin... Unfortunately the presence of two versions doesn't depend on me.
Concerning the question of corona: no, I don't use make because I don't work with a so big code. I'm just implementing some little programs in a physics simulator that needs only a particular compiler version to make its source files...

Try calling /usr/bin/gcc-4.2.2 instead of gcc.