That'd mean we have a different compiler in CI than what the developers use on their workstations - which is not a good thing. And wouldn't be tolerated there anyway - people already had some doubts when we were wrapping IAR with wine and a bit of shell to look like a standard UNIX toolchain.
(Shout-out to IAR, though. I still think they're overpriced and you don't really need them - but if you're stuck with them their support is excellent. When an update broke license handling in our setup they didn't tell us to go away like any other vendor would've done for that kind of wildly unsupported use case, but actually made it work again in the next release. They also got us access to native Linux binaries way before they even were talking in public about working on that to play around with for our CI)
(Shout-out to IAR, though. I still think they're overpriced and you don't really need them - but if you're stuck with them their support is excellent. When an update broke license handling in our setup they didn't tell us to go away like any other vendor would've done for that kind of wildly unsupported use case, but actually made it work again in the next release. They also got us access to native Linux binaries way before they even were talking in public about working on that to play around with for our CI)