[r15-7853 Regression] FAIL: 26_numerics/complex/tuple_like.cc -std=gnu++26 (test for excess errors) on Linux/x86_64

[haochen.jiang]

On Linux/x86_64,

de231924b73bc120bf2b7ada4eeccd884c249ee1 is the first bad commit
commit de231924b73bc120bf2b7ada4eeccd884c249ee1
Author: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
Date:   Thu Feb 27 22:47:27 2025 +0100

    libstdc++: implement tuple protocol for std::complex (P2819R2)

caused

FAIL: 26_numerics/complex/tuple_like.cc  -std=gnu++26 (test for excess errors)

with GCC configured with

../../gcc/configure --prefix=/export/users/haochenj/src/gcc-bisect/master/master/r15-7853/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}/x86_64-linux/libstdc++-v3/testsuite && make check RUNTESTFLAGS="conformance.exp=26_numerics/complex/tuple_like.cc --target_board='unix{-m32}'"
$ cd {build_dir}/x86_64-linux/libstdc++-v3/testsuite && make check RUNTESTFLAGS="conformance.exp=26_numerics/complex/tuple_like.cc --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.)