New comment by pullmoll on void-packages repository

https://github.com/void-linux/void-packages/issues/11663#issuecomment-493672670
Comment:
Another strange thing is the only call to `bch_bkey_dump` is from `drivers/md/bcache/bset.c:31` and there an `#ifdef CONFIG_BCACHE_DEBUG` is around that code. This macro is not defined in our `x86_64-dotconfig` and consequently it is not set in either of the `/boot/config-4.19.44_1` files of the two kernel builds.
This explains why `gcc-8.3.0` decided to drop the static `bch_key_dump` function but why does `gcc-9.1.0` not do the same?