toolchain/60567: netbsd-11 "build.sh tools" fails on GCC 15 hosts

>Number:         60567
>Category:       toolchain
>Synopsis:       netbsd-11 "build.sh tools" fails on GCC 15 hosts
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    toolchain-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Aug 10 00:40:00 +0000 2026
>Originator:     Izumi Tsutsui
>Release:        NetBSD 11.0
>Organization:
>Environment:
System: NetBSD mirage 11.0 NetBSD 11.0 (GENERIC) #0: Thu Jul 30 15:23:12 UTC 2026 [email protected]:/usr/src/sys/arch/i386/compile/GENERIC i386
Architecture: i386 (and all)
Machine: i386 (and all)
>Description:
build.sh on GCC 15 hosts (ubuntu 26.04 etc.) fails in src/tools/texinfo:
 https://mail-index.netbsd.org/current-users/2025/11/28/msg047068.html
due to -Werror=incompatible-pointer-types caused by -std=gnu23
(default on gcc15).

build.sh on GCC 14 hosts (debian 13 etc.) works.

>How-To-Repeat:
Fetch netbsd-11 src sets and
"sh build.sh -U -m amd64 tools"
on GCC 15 hosts.

>Fix:
Pull the following commit to HEAD?
 https://mail-index.netbsd.org/source-changes/2025/12/31/msg159803.html

(Maybe we should have daily build tests on non-NetBSD hosts?)
---
Izumi Tsutsui