[r15-2362 Regression] FAIL: g++.dg/cpp2a/consteval-prop21.C -std=c++26 (test for excess errors) on Linux/x86_64

[r15-2362 Regression] FAIL: g++.dg/cpp2a/consteval-prop21.C -std=c++26 (test for excess errors) on Linux/x86_64

[haochen.jiang]

On Linux/x86_64,

a9e9f772c7488ac0c09dd92f28890bdab939771a is the first bad commit
commit a9e9f772c7488ac0c09dd92f28890bdab939771a
Author: Jason Merrill <jason@redhat.com>
Date:   Fri Jul 26 17:20:18 2024 -0400

    c++: consteval propagation and templates [PR115986]

caused

FAIL: g++.dg/cpp2a/consteval-prop21.C  -std=c++20 (test for excess errors)
FAIL: g++.dg/cpp2a/consteval-prop21.C  -std=c++23 (test for excess errors)
FAIL: g++.dg/cpp2a/consteval-prop21.C  -std=c++26 (test for excess errors)

with GCC configured with

../../gcc/configure --prefix=/export/users/haochenj/src/gcc-bisect/master/master/r15-2362/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/cpp2a/consteval-prop21.C --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=g++.dg/cpp2a/consteval-prop21.C --target_board='unix{-m32\ -march=cascadelake}'"

(Please do not reply to this email, for question about this report, contact me at haochen dot jiang at intel.com.)
(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.)