Compilation fails on Arch-linux due to incomplete types.

[ebknudsen]

After some upstream updates compilation fails on several of our Arch systems.

For some reason it seems double down does not find some MOAB header file causing CartVect from the moab namespace to be undefined, and hence various function declarations become incomplete.

We have not yet been able to pinpoint the root cause of this (nor which upstream update)

[pshriwise]

Interesting! I'll have a look. What version of MOAB is being used in this build?

[ebknudsen]

5.3.0, but the same manifests itself with 5.3.1.

Btw. this was using gcc-12. I did also try compiling with gcc-8 but that didn't change anything.

[pshriwise]

I'm noticing that the Vec3da type is also incomplete, but I don't think anything has changed in that header file... 🤔

[ebknudsen]

Indeed - it is puzzling.
An interesting point is perhaps that we (as in colleagues and I) compiled double down and moab (v 5.3.1) on May 20th with no problems. This problem we noticed June 5th IIRC. Likely it is some upstream edit that trips double down up.

[pshriwise]

Alright, I was able to reproduce in an arch-linux docker image and got this sorted out. Turns out it didn't have to do with the Ved3da or moab::CartVect types after all. It was the std::array that was incompletely defined. I've opened #35 to resolve this issue.

Thank you for bringing it to my attention, @ebknudsen!

[pshriwise]

Along these lines, would it be helpful to you if I were to add arch-linux to the CI here?

[ebknudsen]

@pshriwise Great that you spotted it.
Wrt. to an Arch CI - I you have access to one, then that would perhaps be helpful. (I know however github doesn't host Arch runners, but you may have access to something else). We are an Arch-shop here.