On Linux/x86_64,
bdae7824cd9a9d27665bf1b82f60a761a9745a6a is the first bad commit
commit bdae7824cd9a9d27665bf1b82f60a761a9745a6a
Author: Jonathan Wakely <jwak...@redhat.com>
Date: Wed Jun 4 15:53:20 2025 +0100
libstdc++: Optimize std::counting_semaphore for futex path
caused
FAIL: g++.dg/modules/xtreme-header-8.C module-cmi xstd (gcm.cache/xstd.gcm)
FAIL: g++.dg/modules/xtreme-header-8.C -std=c++26 (test for excess errors)
with GCC configured with
../../gcc/configure
--prefix=/export/users3/haochenj/src/gcc-bisect/master/master/r16-1247/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="modules.exp=g++.dg/modules/xtreme-header-8.C
--target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check
RUNTESTFLAGS="modules.exp=g++.dg/modules/xtreme-header-8.C
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check
RUNTESTFLAGS="modules.exp=g++.dg/modules/xtreme-header-8.C
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check
RUNTESTFLAGS="modules.exp=g++.dg/modules/xtreme-header-8.C
--target_board='unix{-m64\ -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.)
