On Linux/x86_64,

80af807e52e4f4c480454e5a54aaeb7ce44556fd is the first bad commit
commit 80af807e52e4f4c480454e5a54aaeb7ce44556fd
Author: Paul-Antoine Arras <[email protected]>
Date:   Thu Oct 16 17:22:08 2025 +0100

    OpenMP: Handle non-executable directives in intervening code 
[PR120180,PR122306]

caused

FAIL: c-c++-common/gomp/attrs-metadirective-2.c  -std=gnu++11 (test for excess 
errors)
FAIL: c-c++-common/gomp/attrs-metadirective-2.c  -std=gnu++17 (test for excess 
errors)
FAIL: c-c++-common/gomp/attrs-metadirective-2.c  -std=gnu++26 (test for excess 
errors)
FAIL: c-c++-common/gomp/attrs-metadirective-2.c (test for excess errors)
FAIL: c-c++-common/gomp/metadirective-2.c  -std=c++17 (test for excess errors)
FAIL: c-c++-common/gomp/metadirective-2.c  -std=c++26 (test for excess errors)
FAIL: c-c++-common/gomp/metadirective-2.c  -std=c++98 (test for excess errors)
FAIL: c-c++-common/gomp/metadirective-2.c (test for excess errors)

with GCC configured with

../../gcc/configure 
--prefix=/export/users3/haochenj/src/gcc-bisect/master/master/r16-4540/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/attrs-metadirective-2.c 
--target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=c-c++-common/gomp/attrs-metadirective-2.c 
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=c-c++-common/gomp/attrs-metadirective-2.c 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=c-c++-common/gomp/attrs-metadirective-2.c 
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=c-c++-common/gomp/metadirective-2.c 
--target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=c-c++-common/gomp/metadirective-2.c 
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=c-c++-common/gomp/metadirective-2.c 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="gomp.exp=c-c++-common/gomp/metadirective-2.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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