Thanks for picking this up! I'd be in favor of simply updating the Ubuntu version to 22.04 (and explicitly pointing to the newest compiler versions) since:

• we don't commit to any extensive build checks platform-wise;
• we'll have to drop support/checks for the oldest compilers at some point anyway, so it may be now;
• doubling the number of CI builds sounds like a waste of time and resources for a small benefit;
• it would keep the workflow simpler.

What do you think?

All of this makes sense to me. I left the old checks as I was not sure whether there was some commitment to support the particular OS/compiler version combination. Since there is none, we can simply use the latest versions. I can imagine this will closely match what people use as their development environment anyway.

Hum, I should have anticipated this would fail since OSRM v5.26.0 has some outdated dependencies and does not compile any more on Ubuntu 22.04. Making the switch to v5.27.1 should solve this problem, and it's also a good move anyway.

Yeah, I was wondering what the problem was.

@kkarbowiak when you have time, can you push a commit changing the env.osrm-tag to v5.27.1 in the vroom_libosrm workflow to see if it works?