Add platform_mappings

[comius]

This makes it possible to use C++ toolchains with rules_swift.

[comius]

Blocked on: bazelbuild/bazel#17127

[keith]

in the meantime we can probably either duplicate everything in the platform_mappings file to use the bzlmod identifier, or specify a different --platforms_mappings= with our bzlmod config on CI

[comius]

in the meantime we can probably either duplicate everything in the platform_mappings file to use the bzlmod identifier

I tried using @apple_support in platform_mapping and even removing repo_name from MODULE.bazel and it just doesn't work

or specify a different --platforms_mappings= with our bzlmod config on CI

that I can do

[comius]

Done

[keith]

erm won't we need it to have content to support the other changes you're making in this job?

[comius]

erm won't we need it to have content to support the other changes you're making in this job?

Sorry I’m not following. I’m just adding plaform mappings from rules_apple and disabling temporary for bzlmod. What other changes?

[keith]

i mean are we going to have to un-disable for bzlmod very soon after you land bazelbuild/bazel#19441?

[comius]

i mean are we going to have to un-disable for bzlmod very soon after you land bazelbuild/bazel#19441?

Correct. Yesterday I didn’t know it will be fixed so quickly. You can either merge this and I prepare a second pr, or I revert this one back to the old form. Whatever you prefer.

[keith]

that PR is 9 months old, I submitted #1104 with the necessary changes to support bzlmod