Separate CI jobs for macOS on x86

[bjosv]

Split the CI jobs for testing Mac to run on both "old" x86 runners and the new M1 runner.

The pre-installed gcc 13.3 (brew package gcc-13) only seems to work with an older MacOSX.sdk version than the default in a macos-12 runner.
Lets update to gcc-14 which has been corrected to be able to use any SDK version.

This PR also adds a check if the compiler is already installed, which silences a warning.

Weekly run:
https://github.com/Nordix/flatcc/actions/runs/9413941834

[mikkelfj]

Thanks for looking into this. Would it make more sense to move to a newer macos runner? Staying compatible with multiple versions old macos might not be worthwhile since Apple generally doesn't seem pay much attention to backwards compat. Also, if there is a newer it might be a more important test case?
Generally, weekly should test old versions of compilers, I'm just not sure exactly how that translates to macos.

[bjosv]

Would it make more sense to move to a newer macos runner?

I guess it would be better to run on later runner releases. The only "issue" I know is that macos-14 is running on M1 machines only and older packages from Hombrew releases are not always available. But building on both x86_64 and arm64 would be good thing anyway.

Maybe we should have a build matrix in the job macos-clang to build on both macos-14(arm64) and macos-13(x86_64), and simlilar for the macos-gcc job?
gcc10 is not available on arm64 though so there is a need to fiddle with gcc versions depending on runner and set the required Xcode version.

[mikkelfj]

yeah, my only concern is that this gets a bit complicated, and the explicit xcode version should hopefully not be necessary, but have no clear understanding of this.

I'm thinking maybe it is better to separate out the x86 build to a separate target and try to keep the M1+ as clean as possible? The x86 will likely get deprecated at some point, and if there are any issues, it will be easier to kill off.

[bjosv]

It looks like there a fixes incoming for a (new) gcc-14 that handles various SDK headers:
Homebrew/homebrew-core@61581e6
so maybe I should just have waited a bit as you said from the beginning :)

Yea, it gets a bit complicated with theses matrixes.. I can make an attempt by moving x86 to its own jobs, and maybe see if we could go for gcc-14 instead if that works without switching Xcode version..

[mikkelfj]

sounds like a plan, thanks

[mikkelfj]

Looks fine, but:
It seems the checks have only run the small build, which is maybe not surprising.
If you look at summary for that build, there are some CMake warnings (I will eventually upgrade to 3.x FWIW)

[bjosv]

So, been of a bit with the flu, but now the warnings should be gone in both CI and weekly.
Lifted macos in the small build and fixed a check in weekly.
Example run in weekly:
https://github.com/Nordix/flatcc/actions/runs/9443621149

[mikkelfj]

Thanks, looks great, get well soon!

[bjosv]

Thanks!
Wellwell, new day, new warnings from Github :)

[Clang 7](https://github.com/dvidelabs/flatcc/actions/runs/9448729894/job/26023376576#step:2:60)
Failed to add apt key via server keyserver.ubuntu.com:

They are probably temporary, but still.. I'll put them in my backlog to see if there are ways to avoid them