Automated report: NetBSD-current/riscv-riscv64 build failure

[NetBSD Test Fixture <bracket%NetBSD.org@localhost>]

This is an automatically generated notice of a NetBSD-current/riscv-
riscv64 build failure.

The failure occurred on babylon5.netbsd.org, a NetBSD/amd64 host,
using sources from CVS date 2026.08.29.16.32.45.

An extract from the build.sh output follows:

    /tmp/build/2026.08.29.16.32.45-riscv-riscv64/tools/bin/riscv64--netbsd-gcc -O2      -std=gnu11   -Werror     --sysroot=/tmp/build/2026.08.29.16.32.45-riscv-riscv64/destdir -DHAVE_CONFIG_H -I/tmp/build/2026.08.29.16.32.45-riscv-riscv64/src/external/gpl2/gettext/bin/msgattrib -I/tmp/build/2026.08.29.16.32.45-riscv-riscv64/src/external/gpl2/gettext/bin/msgattrib/../../include  -I/tmp/build/2026.08.29.16.32.45-riscv-riscv64/src/external/gpl2/gettext/dist/gettext-tools/gnulib-lib  -DLOCALEDIR=\"/usr/share/locale\"  -DBISON_LOCALEDIR=\"\"  -DPKGDATADIR=\"\"  -I/tmp/build/2026.08.29.16.32.45-riscv-riscv64/src/external/gpl2/gettext/dist/gettext-tools/src -c    /tmp/build/2026.08.29.16.32.45-riscv-riscv64/src/external/gpl2/gettext/dist/gettext-tools/src/msgattrib.c -o msgattrib.o
    --- dependall-gpl3 ---
    checking for kill... yes
    --- dependall-sbin ---
    /tmp/build/2026.08.29.16.32.45-riscv-riscv64/src/sbin/mount_lfs/mount_lfs.c: In function 'invoke_cleaner':
    /tmp/build/2026.08.29.16.32.45-riscv-riscv64/src/sbin/mount_lfs/mount_lfs.c:321:9: error: implicit declaration of function 'unreachable' [-Wimplicit-function-declaration]
      321 |         unreachable();
          |         ^~~~~~~~~~~
    --- dependall-usr.bin ---
    --- mkcsmapper ---

Between the last successful build and the first failed build, a total
of 1104 revisions were committed, by the following developers:

    christos
    riastradh

The first of these commits was CVS date 2026.08.29.01.59.51,
and the last on CVS date 2026.08.29.16.32.45.

Logs can be found at:

    https://releng.NetBSD.org/b5reports/riscv-riscv64/commits-2026.08.html#2026.08.29.16.32.45