Add HPX to Godbolt Compiler Explorer

[correaa]

Please consider adding the HPX library to Compiler Explorer, so other projects can test interoperability with HPX.

I have put libraries in CE but all of them were header-only, not sure if that is an obstacle.

[hkaiser]

@srinivasyadav18 has been working on this and has had some first results. Would you be interested in trying to finish what he has started?

[Pansysk75]

@srinivasyadav18 has been working on this and has had some first results. Would you be interested in trying to finish what he has started?

I think Srinivas was blocked by the lack of a proper mechanism for fetching and installing Boost alongside HPX.
I have that almost ready, so I will try to get it merged soon, so we can use it for the Godbolt integration.

[correaa]

Godbolt already includes some version of Boost.
Can't these be reused?

Sorry, I don't know how the Godbolt infraestructure works exactly.

[hkaiser]

Godbolt already includes some version of Boost. Can't these be reused?

Sorry, I don't know how the Godbolt infraestructure works exactly.

Yes, this is correct. We need to fix our build system to be able to pick up on a pre-installed Boost version. This is what @Pansysk75 was referring to (and he has been working on the PR for this: #6510)