Installing redundant compilers

mreff555 · Posted: Sun Jun 29, 2014 12:50 pm Post subject: Installing redundant compilers

I'm ripping my hair out trying to teach myself cuda. Ironically I gave up on TBB and atomic because I thought cuda would be more simple. nope.

Anyway, after finally "almost" making progress I discovered that my problem is that nvcc doesn't support gcc 4.7. Is there a way I can install 4.6 in addition to 4.7 and somehow intelligently switch between them?

mreff555 · Posted: Sun Jun 29, 2014 12:59 pm Post subject:

Solved my own problem. Sort of

gcc-4.6.3 was still installed. Honestly I don't know why, but I just symboliclly linked it to a file called gcc in the cuda bin directory.

Hu · Administrator Joined: 06 Mar 2007 Posts: 22657

You can install major versions of gcc side-by-side via the SLOT mechanism. You should probably not create symlinks named gcc in searched paths, but instead either set your system compiler to the desired version of gcc or, preferably, configure nvcc to invoke a qualified gcc name. You probably want it to run gcc-4.6.4 instead of gcc.

defer- · Posted: Sun Jun 29, 2014 4:02 pm Post subject:

You can use gcc-config -l to list available versions and gcc-config <number> to set active compiler system wide.

You can use different compiler temporarily by setting $CC variable.
CC=gcc-4.6.4 ./configure
CC=gcc-4.6.4 make
_________________
https://github.com/defer-

The Doctor · Moderator Joined: 27 Jul 2010 Posts: 2678

This sound like the perfect use of package.env to me. Create a file /etc/portage/env/gcc2 with the contents