Re: Installation problem

[LLeweLLyn Reese <llewelly at lifesupport dot shutdown dot com>]

Marc-André Breton <marc dot andre dot breton at lagrit dot etsmtl dot ca> writes:

> Hi all,
> 
> I had an old version of gcc (gcc-2.96) and I tried to install the last release 
> (gcc-3.2.2). I work on a Linux platform, so I did the following steps to 
> install it:
> 1) download gcc-3.2.2.tar.gz from one of mirror sites
> 2) uncompressed this file in /home (Now I have /home/gcc-3.2.2)
> 3) cd /home/gcc-3.2.2
> 4) [root at lagrit12 gcc-3.2.2]# ./configure

First of all you should build gcc in a seperate directory from the
source dir:

3) mkdir /home/gcc-3.2.2.objdir
4) cd /home/gcc-3.2.2.objdir
5) [root at lagrit12 gcc-3.2.2.objdir]# ../gcc-3.2.2/configure --prefix=/usr/local/gcc-3.2.2

Second, the default prefix is /usr/local, but the only sure way to be
    able to uninstall gcc is to put it in its own directory - I
    usually use /usr/local/<gcc-version> . Furtheremore, it isn't safe
    to install two versions of gcc with the same prefix. (Note: your
    linux distro will typically use prefix=/usr for the compiler that
    comes with the distro.)

Please read http://gcc.gnu.org/install/configure.html
    for details.

6) [root at lagrit12 gcc-3.2.2.objdir]# make
7) [root at lagrit12 gcc-3.2.2.objdir]# make install


> 5) [root at lagrit12 gcc-3.2.2]# make
> 6) [root at lagrit12 gcc-3.2.2]# make install
> 
> All seem work well but when I type in my console "gcc -v", I see that it's the 
> old version who is working again.
> {Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/2.96/specs
> gcc version 2.96 20000731 (Red Hat Linux 7.3 2.96110)}
[snip]

Your new version of gcc will have its executables in <prefix>/bin . By
    default, prefix is /usr/local . So "/usr/local/bin/gcc -v" should
    fetch out 3.2.2 . If you wish this to be the default, put
    /usr/local/bin at the front of your path.

Additionaly, you may need to add <prefix>/lib to your LD_LIBRARY_PATH,
    or tell ldconfig to add <prefix>/lib to the list of dirs it stuffs
    in the link cache, so that programs compiled with gcc 3.2.2 can
    find their shared libs.