The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the first successful build:
2024.06.30.19.19.47 mrg src/external/gpl3/gcc/dist/libstdc++-v3/src/filesystem/ops-common.h 1.2 Logs can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2024.06.html#2024.06.30.19.19.47