[r16-4338 Regression] FAIL: c-c++-common/gomp/append-args-7.c -std=c++26 (test for excess errors) on Linux/x86_64

"Jiang, Haochen via Gcc-regression" <[email protected]>
Newsgroups gmane.comp.gcc.regression,gmane.comp.gcc.patches
Message-ID <SJ5PPF77D28E3C2E1D5E4ADF75B5AE997F4ECECA@SJ5PPF77D28E3C2.namprd11.prod.outlook.com>
On Linux/x86_64,

4e44fe4280bf2d9ddc135dec18ec109805c539b9 is the first bad commit
commit 4e44fe4280bf2d9ddc135dec18ec109805c539b9
Author: Jakub Jelinek <[email protected]>
Date:   Thu Oct 9 22:41:30 2025 +0200

    c++: C++26 va_start - part of P3348R4 - C++26 should refer to C23 not C17

caused

FAIL: c-c++-common/gomp/append-args-7.c  -std=c++26  scan-tree-dump-times gimple "f3 \\(obj1, obj2, 1, a, cp, d\\);" 1
FAIL: c-c++-common/gomp/append-args-7.c  -std=c++26 (test for excess errors)

with GCC configured with

../../gcc/configure --prefix=/export/users3/haochenj/src/gcc-bisect/master/master/r16-4338/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="gomp.exp=c-c++-common/gomp/append-args-7.c --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="gomp.exp=c-c++-common/gomp/append-args-7.c --target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="gomp.exp=c-c++-common/gomp/append-args-7.c --target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="gomp.exp=c-c++-common/gomp/append-args-7.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.)
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