Question about GCC 3.2.2 and 2.95

deepsix · 05-23-2003, 11:35 AM

I'm running redhat 9 with gcc 3.2.2 along with the backwards compatibility back to gcc 2.96
I found a driver I need to install that requires gcc 2.95
If I install and older version of gcc say 2.95 then will there be compatibilty issues with 3.2.2?

iceman47 · 05-23-2003, 12:15 PM

nope, I've got 2.95, 3.0, 3.2 and 3.3 living together,
just make sure the gcc symlink points to the one you want to use.

deepsix · 05-23-2003, 04:24 PM

sweet thanks alot iceman.........
take it easy

realos · 06-04-2003, 02:36 AM

iceman47 ,

Just being curious, what is your strategy for doing this. I mean did you choose different directories for each one of them and then made gcc link in each to the respective gcc version, like:

ln -sf /directory/for/gcc-3/bin/gcc-3.0 /directory/for/gcc-3/bin/gcc
ls -sf /directory/for/gcc-2.95/bin/gcc-2.95 /directory/for/gcc-2.95/bin/gcc
ls -sf /directory/for/gcc-2.95/bin/gcc-3.02 /directory/for/gcc-3.02/bin/gcc

do you change your path each time you want to change the gcc version?

devin · 06-04-2003, 04:12 PM

gcc should point to the one you use more often..

then what you could do is this:
cd /usr/bin
ln -s /path/to/gcc-2.95/bin/gcc gcc2

then whenever you want to compile something with
gcc 2.95 change the make file from gcc to gcc2

deepsix · 06-05-2003, 03:03 PM

Quote:

Originally posted by devin
gcc should point to the one you use more often..

then what you could do is this:
cd /usr/bin
ln -s /path/to/gcc-2.95/bin/gcc gcc2

then whenever you want to compile something with
gcc 2.95 change the make file from gcc to gcc2

any thoughts?

realos · 07-29-2003, 02:41 PM

@devin: your answer sounds very reasonable.
Thankx for sharing ideas. I will try it out.

devin · 07-29-2003, 03:32 PM

I believe it should work since CC ususally points to gcc on Linux systems but on Unix systems CC may point to the companies own proprietary compiler.

TheLinuxDuck · 07-29-2003, 04:14 PM

Wouldn't it be easier to modify the env var CC to reflect the name of the compiler to use, instead of changing symlinks? IIRC, you can pass CC=gcc3.0.2 (or the like) to ./configure, or even just create a simple makefile for the project to compile, and put the correct compiler name.

Maybe I'm just oversymplifying it. I've never dealt with multiple compiler versions on a system.

DIYLinux · 07-30-2003, 02:54 AM

Dump gcc 2.96. This is an unofficial version, and seems to be causing a lot of problems with C++. I saw two posts to that effect on this forum in the last couple of days.

If you need gcc-2.xx (typically for some kernel/module work on older kernels), use gcc-2.95.2 or gcc-2.95.3.

Use gcc-3.x.x if you are doing C++. It features many improvements in modern C++ features and its optimizer is superior.