There seem to be the only place in Hotspot where this warning fires, yet the warning is disabled wholesale for Hotspot. This is not good.
I can trace the addition of char-subscripts exclusion to [JDK-8211029](https://bugs.openjdk.org/browse/JDK-8211029) (Sep 2018). The only place in Hotspot where in fires is present from the initial load (2007). The underlying problem that this warning tells us about is that `char` might be signed on some platforms, so we can potentially access the negative index. It is not a bug in our current code, that bounds the value of `k` under `MAXID-1`, which is `19`. Additional testing: - [ ] Linux x86_64 fastdebug `tier1` - [x] The build matrix of: - GCC 10 - {i686, x86_64, aarch64, powerpc64le, s390x, armhf, riscv64} - {server} - {release, fastdebug} ------------- Commit messages: - Fix Changes: https://git.openjdk.org/jdk/pull/10455/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10455&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8294468 Stats: 4 lines in 2 files changed: 1 ins; 0 del; 3 mod Patch: https://git.openjdk.org/jdk/pull/10455.diff Fetch: git fetch https://git.openjdk.org/jdk pull/10455/head:pull/10455 PR: https://git.openjdk.org/jdk/pull/10455
