Make CUDA 12.6 compiler work on Fedora 40

[AlexKurek]

Description

This is the base to add CUDA to DP3 and Sagecal.
Explanation: https://negativo17.org/cuda-with-unsupported-gcc-versions/

Related: #151, #152.

[tikk3r]

What does it do? CUDA has flags to enable unsupported compilers on its own, but I haven't had success with that.

[AlexKurek]

It installs GCC 13 and redirects the calls to it (to version 13).

[tikk3r]

It installs GCC 13 and redirects the calls to it (to version 13).

How much space does that take? There's not really any CUDA functionality that we use, so installing a whole second compiler suite is a bit overkill just to get CUDA.

[AlexKurek]

It installs just 3 packages:

Installing:
 cuda-gcc              noarch 13.3.1-1.fc41          fedora-multimedi 244.0   B
Installing dependencies:
 gcc13                 x86_64 13.3.1-2.fc41.1        fedora           104.5 MiB
 gcc13-c++             x86_64 13.3.1-2.fc41.1        fedora            55.0 MiB

EDIT
...and I'm not sure if it will work. So far I have not had any success with it.

[AlexKurek]

There's not really any CUDA functionality that we use

Isn't it like when e.g. DP3 sees that GPU is present and something can be computed faster by GPU - it will compute it using CUDA on GPU, even if a papielline is not (directly) using CUDA?
Only then would it be worth fighting for providing CUDA for DP3 I think.

[tikk3r]

There's not really any CUDA functionality that we use

Isn't it like when e.g. DP3 sees that GPU is present and something can be computed faster by GPU - it will compute it using CUDA on GPU, even if a papielline is not (directly) using CUDA? Only then would it be worth fighting for providing CUDA for DP3 I think.

No it's not that simple unfortunately. From what I know there is only one specific solver mode that has a GPU version at the moment.

[AlexKurek]

Understood. So I think I will close this PR. Please decide what to do with the other two: #151, #152. One option is to wait for a new version of CUDA that will support GCC 14 and then merge them.

[tikk3r]

Understood. So I think I will close this PR. Please decide what to do with the other two: #151, #152. One option is to wait for a new version of CUDA that will support GCC 14 and then merge them.

For DP3 it's hardcoded to off at the moment. It can be left like that for the time being. For Sagecal it'll depend how it uses it, IDG builds for example, so you'll just have to test it.

[AlexKurek]

These #151 #152 both currently crash.