On Linux/x86_64,
3a0e01f6bb1d6ec444001f2caea6ef43a4a83e3a is the first bad commit commit 3a0e01f6bb1d6ec444001f2caea6ef43a4a83e3a Author: Jonathan Wakely <jwak...@redhat.com> Date: Fri Sep 1 21:27:57 2023 +0100 libstdc++: Add support for running tests with multiple -std options caused FAIL: 23_containers/vector/bool/110807.cc -std=gnu++17 (test for excess errors) with GCC configured with ../../gcc/configure --prefix=/export/users/haochenj/src/gcc-bisect/master/master/r14-4046/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=23_containers/vector/bool/110807.cc --target_board='unix{-m32}'" $ cd {build_dir}/x86_64-linux/libstdc++-v3/testsuite && make check RUNTESTFLAGS="conformance.exp=23_containers/vector/bool/110807.cc --target_board='unix{-m32\ -march=cascadelake}'" (Please do not reply to this email, for question about this report, contact me at lin1 dot hu 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.)