On Linux/x86_64,
698a6af5dcbae5d935bcda8a461dea8458c658dc is the first bad commit
commit 698a6af5dcbae5d935bcda8a461dea8458c658dc
Author: François Dumont <[email protected]>
Date: Mon Feb 23 18:58:00 2026 +0100
libstdc++: [_GLIBCXX_DEBUG][__cplusplus >= 201103L] Remove useless
workaround
caused
FAIL: 21_strings/basic_string/requirements/dr438/constructor.cc -std=gnu++20
(test for excess errors)
with GCC configured with
../../gcc/configure
--prefix=/export/users3/haochenj/src/gcc-bisect/master/master/r16-7945/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=21_strings/basic_string/requirements/dr438/constructor.cc
--target_board='unix{-m32}'"
$ cd {build_dir}/x86_64-linux/libstdc++-v3/testsuite && make check
RUNTESTFLAGS="conformance.exp=21_strings/basic_string/requirements/dr438/constructor.cc
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/x86_64-linux/libstdc++-v3/testsuite && make check
RUNTESTFLAGS="conformance.exp=21_strings/basic_string/requirements/dr438/constructor.cc
--target_board='unix{-m64}'"
$ cd {build_dir}/x86_64-linux/libstdc++-v3/testsuite && make check
RUNTESTFLAGS="conformance.exp=21_strings/basic_string/requirements/dr438/constructor.cc
--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.)
