[Metal] Silence compile warning with [[maybe_unused]]

[k-ye]

Related issue id = #593

[Click here for the format server]

[yuanming-hu]

Does requesting a review from @taichi-gardener (which is a robot) means a request to auto-format your code (which sounds like a great idea), or should I review it instead?

[k-ye]

Does requesting a review from @taichi-gardener (which is a robot) means a request to auto-format your code (which sounds like a great idea), or should I review it instead?

The former :) I will ping you directly if i think a PR is worth a review... BTW, I found that clicking the format server sometimes didn't generate a reformat commit. Does that mean that there is no change after the server formats the PR?

[yuanming-hu]

The former :)

This sounds like a great feature to implement. Much better than the current format server approach.

BTW, I found that clicking the format server sometimes didn't generate a reformat commit. Does that mean that there is no change after the server formats the PR?

Right, there's no way to commit without a changeset.

[k-ye]

This sounds like a great feature to implement. Much better than the current format server approach.

I should probably clarify 😂 I added @taichi-gardener in the hope that it will do an automatic reformat for me on this PR. Not sure if this actually works...

[yuanming-hu]

This sounds like a great feature to implement. Much better than the current format server approach.

I should probably clarify I added @taichi-gardener in the hope that it will do an automatic reformat for me on this PR. Not sure if this actually works...

No, currently this won't work. But I think this is a great idea. Someone needs to implement this using github API.

[k-ye]

Hmm, guess this will be one of those "nuance differences" between my local clang-format (9.0 IIRC) and clang-format-6.0... Seems like 6.0 couldn't handle the code nested inside the STR macro very well. I would probably just force repush..

[yuanming-hu]

Sounds good. Another option is to install clang-format-9.0 on the format server when it is easy enough to use.

[k-ye]

I guess one of those clang-format options probably controls this behavior, but i'm too lazy to figure that out... Anyway, I've reformatted locally and disabled clang-format around this piece of code