On Tue, Mar 3, 2020 at 12:06 PM Masaru Nomiya wrote:

RO> What is the best way to have two versions of gcc installed?

How about using the 'update-alteenatives'?

There is always that. I was hoping that I could build this in a Makefile where I select the version of gcc to use. As gcc is many components (compiler, assembler, linker, etc), would one need to do this for each? Or is it a more general thing? -- Roger Oberholtzer -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org

On Tue, 3 Mar 2020 13:24:23 +0100 Roger Oberholtzer wrote:

On Tue, Mar 3, 2020 at 12:06 PM Masaru Nomiya wrote:

...

Hello,

In the Message;

Subject : [opensuse] NVIDIA nvcc (CUDA compiler) on Tumbleweed, and gcc versions Message-ID : Date & Time: Tue, 3 Mar 2020 08:55:29 +0100

[RO] == Roger Oberholtzer has written:

RO> I have installed the NVIDIA CUDA RPMS on Tumbleweed. Although RO> they are packaged by NVIDIA for Leap 15.1, they seem to have RO> installed. [...] RO> What is the best way to have two versions of gcc installed?

How about using the 'update-alteenatives'?

Another thing is, what happens when an update for one of the compilers is installed. Let's say I have both gcc8 and gcc9 installed. I have gcc9 as my default. What happens when an update for gcc8 is installed? Does it now become the default? Where will /usr/bin/gcc be pointing?

With gcc9, it is like this:

lrwxrwxrwx 1 root root 5 Oct 8 14:11 /usr/bin/gcc -> gcc-9 -rwxr-xr-x 1 root root 760456 Feb 4 22:14 /usr/bin/gcc-9 lrwxrwxrwx 1 root root 8 Oct 8 14:11 /usr/bin/gcc-ar -> gcc-ar-9 -rwxr-xr-x 1 root root 27064 Feb 4 22:14 /usr/bin/gcc-ar-9 lrwxrwxrwx 1 root root 8 Oct 8 14:11 /usr/bin/gcc-nm -> gcc-nm-9 -rwxr-xr-x 1 root root 27056 Feb 4 22:14 /usr/bin/gcc-nm-9 lrwxrwxrwx 1 root root 12 Oct 8 14:11 /usr/bin/gcc-ranlib -> gcc-ranlib-9 -rwxr-xr-x 1 root root 27072 Feb 4 22:14 /usr/bin/gcc-ranlib-9

What happens after gcc8 is updated?

Don't know much about it but maybe it is easier to isolate the extra gcc in a VM? -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org

On 03/03/20 22:10, Roger Oberholtzer wrote:

On Tue, Mar 3, 2020 at 3:58 PM Dave Howorth wrote:

...

Don't know much about it but maybe it is easier to isolate the extra gcc in a VM?

I decided to see what happened on a test computer. This is what I did:

1. Installed cuda-repo-opensuse15-10-2-local-10.2.89-440.33.01-1.0-1.x86_64.rpm, from NVIDIA. It really adds a local repo with all the RPMs. That's why it's >2.6GB

2. Installed the RPMS actually needed (256 MB) from the above repo.

3. Added gcc8 and gcc8-c++ from OBS. The existing links to gcc 9 remained unchanged. This was my worry. Release 8 is installed along side of release 9, and release 9 seems to remain the default.

4. When running nvcc, add this to the command line: -ccbin=gcc-8

5. My library and program compiled without error. It just needs the libcuda.so.1 that gets installed as part of the NVIDIA driver (it used a stub library to complete the compile). Updating my system from Nouveau to NVIDIA is next. Then I will be able to test that all this results in functioning software.

So I guess my question was answered. But there is still more to do before I can say CUDA is doing what I need it to do...

I simply removed the #if gcc version check in the CUDA headers. It worked fine with Tumbleweed's gcc 9 for now, but unless I find an error (i.e. the actual reason why NVIDIA wants to avoid gcc 9), I will not install two compilers. -- Christoph Feck -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org