[r17-810 Regression] FAIL: g++.dg/reflect/define_static_array4.C -std=c++26 (test for excess errors) on Linux/x86_64

[Haochen Jiang]

On Linux/x86_64,

7239744d25dadf39f431dfe38f3c03942acdb979 is the first bad commit
commit 7239744d25dadf39f431dfe38f3c03942acdb979
Author: Tomasz Kamiński <tkami...@redhat.com>
Date:   Fri Apr 24 05:26:13 2026 +0200

    libstdc++: Make ref_view<R> statically sized if R has static size

caused

FAIL: g++.dg/reflect/define_static_array4.C  -std=c++26 (test for excess errors)

with GCC configured with

../../gcc/configure 
--prefix=/export/users3/haochenj/src/gcc-bisect/master/master/r17-810/usr 
--enable-clocale=gnu --with-system-zlib --with-demangler-in-ld 
--with-fpmath=sse --enable-languages=c,c++,fortran --enable-cet --without-isl 
--enable-libmpx x86_64-linux --disable-bootstrap

To reproduce:

$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="dg.exp=g++.dg/reflect/define_static_array4.C 
--target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="dg.exp=g++.dg/reflect/define_static_array4.C 
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="dg.exp=g++.dg/reflect/define_static_array4.C 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="dg.exp=g++.dg/reflect/define_static_array4.C 
--target_board='unix{-m64\ -march=cascadelake}'"

(Please directly reply to this email for question about this report.)
(If you met problems with cascadelake related, disabling AVX512F in command 
line might save that.)
(However, please make sure that there is no potential problems with AVX512.)