Drop compatibility with Xcode 12

[traversaro]

For the motivations described in robotology/ycm-cmake-modules#368, supporting Xcode 12 is quite complicated at the moment, so we just remove it from the CI jobs and we will document that we don't support it.

[drdanz]

For reference, I'm planning to release 0.12.1 in a couple of days...

[traversaro]

For reference, I'm planning to release 0.12.1 in a couple of days...

Exactly, this is for starting gaining time and test the 0.12.1 on all the CIs jobs, and catch early any possible problem.

[traversaro]

For reference, I'm planning to release 0.12.1 in a couple of days...

Exactly, this is for starting gaining time and test the 0.12.1 on all the CIs jobs, and catch early any possible problem.

Indeed, CI is still not working.

[drdanz]

I'll stand by for the release then 😆

[traversaro]

For reference, I'm planning to release 0.12.1 in a couple of days...

Exactly, this is for starting gaining time and test the 0.12.1 on all the CIs jobs, and catch early any possible problem.

Indeed, CI is still not working.

There were still some problem, hopefully fixed by robotology/ycm-cmake-modules#367 . As a test I included the commit of the PR in the release file for now.

[traversaro]

The version of YCM set in the .yaml was ignored, because there was a bug in the .yaml file because YCM was referred with the repo name ycm, instead of which the CMake package name YCM . This is not the first time it happens, so it is better to open an issue on how to to fix this in the long term.

[traversaro]

Ok, now a new error:

-- Generating done
  The custom command generating

    /Users/runner/work/robotology-superbuild/robotology-superbuild/build/robotology/YCM/CMakeFiles/YCMStamp/$(CONFIGURATION)$(EFFECTIVE_PLATFORM_NAME)/YCM-mkdir

  is attached to multiple targets:

    YCM-update
    YCM

  but none of these is a common dependency of the other(s).  This is not
  allowed by the Xcode "new build system".


CMake Generate step failed.  Build files cannot be regenerated correctly.