install gcc
 

Hi all,
I am going to upgrade gcc to v3.0. Must I uninstall the previous one first?

I have installed gcc3.0 directly without removing the previous version. However, when I issue `g++ -v`, it still reports the previous version. So I tried to uninstall the previous version, however, system report I can't do that because of dependences. Anyway, I issue `rpm -e` to remove gcc-g++ and the some libraries finally. After have reinstalled gcc3.0 again, I can compile codes but fail in running them(report xxx.so.3 and so on missing).

How can I upgrade gcc correctly? What should I do now?

Thanks.

gcc v3+ is normally called gcc3 not gcc, unless you specifically link it to that name. you should keep 2.9whatever installed aswell. they exist fine side by side.

Do you mean I should issue gcc3 rather than gcc for compiling?

most confgiure scripts will check for gcc and then gcc3. if you want to compile with gcc3 always then manually change the gcc3 symlink or just uninstall the old one

Yes, I found that the new compiler has gcc located at other directory. I built a link point to the new compiler and everything is all right. However, when I run the compiled program which is compiling with the new compiler. Error occurs!!!

/test:relocation error: undefined symbol:_ZTVN10__cxxabiv117__class_type_infoE

I think the executable file need some libraries that have linked to the old one. I don't know what to do.

You need library path to libraries coming with new gcc. If gcc is in /usr/local/bin (default), its libraries are in /usr/local/lib. Add this directory into /etc/ld.so.conf and run ldconfig.

Still no good. I don't know why. I can't compile the old source code with new compiler now.
Do you know what cvs is? Can I use cvs to upgrade gcc? How?

Thanks.