Compile errors with ldc-build-runtime --testrunners

[kinke]

On Monday, 6 January 2020 at 13:51:40 UTC, Jacob Carlborg wrote:
> I don’t see how that would ever compile. Why hasn’t that been 
> caught by the CI pipelines?

druntime/Phobos now requires -dip1000. See 
https://github.com/ldc-developers/ldc/blob/1743be4e8ea5bee570907c53f85d1658cbd8b1e6/runtime/CMakeLists.txt#L40 for the current default D flags. Setting them via ldc-build-runtime's --dFlags overrides these defaults; extending that list instead would probably make more sense.