On Linux/x86_64,
d5634bbbaaa5c0a23988703d0d62f66c6df561bd is the first bad commit
commit d5634bbbaaa5c0a23988703d0d62f66c6df561bd
Author: Patrick Palka <[email protected]>
Date: Fri Aug 14 15:53:23 2026 -0400
c++: INIT_EXPR trial constexpr folding
caused
FAIL: 23_containers/mdspan/layouts/padded_neg.cc -std=gnu++26 (test for
errors, line 247)
FAIL: 23_containers/mdspan/layouts/padded_neg.cc -std=gnu++26 (test for
errors, line 248)
FAIL: 23_containers/mdspan/layouts/padded_neg.cc -std=gnu++26 (test for
errors, line 298)
FAIL: 23_containers/mdspan/layouts/padded_neg.cc -std=gnu++26 (test for
errors, line 302)
FAIL: 23_containers/mdspan/layouts/padded_neg.cc -std=gnu++29 (test for
errors, line 247)
FAIL: 23_containers/mdspan/layouts/padded_neg.cc -std=gnu++29 (test for
errors, line 248)
FAIL: 23_containers/mdspan/layouts/padded_neg.cc -std=gnu++29 (test for
errors, line 298)
FAIL: 23_containers/mdspan/layouts/padded_neg.cc -std=gnu++29 (test for
errors, line 302)
FAIL: 23_containers/mdspan/submdspan/canonical_slices_neg.cc -std=gnu++26
(test for errors, line 58)
FAIL: 23_containers/mdspan/submdspan/canonical_slices_neg.cc -std=gnu++26
(test for errors, line 61)
FAIL: 23_containers/mdspan/submdspan/canonical_slices_neg.cc -std=gnu++26
(test for errors, line 62)
FAIL: 23_containers/mdspan/submdspan/canonical_slices_neg.cc -std=gnu++29
(test for errors, line 58)
FAIL: 23_containers/mdspan/submdspan/canonical_slices_neg.cc -std=gnu++29
(test for errors, line 61)
FAIL: 23_containers/mdspan/submdspan/canonical_slices_neg.cc -std=gnu++29
(test for errors, line 62)
with GCC configured with
../../gcc/configure
--prefix=/export/users3/haochenj/src/gcc-bisect/master/master/r17-3305/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/mdspan/layouts/padded_neg.cc
--target_board='unix{-m32}'"
$ cd {build_dir}/x86_64-linux/libstdc++-v3/testsuite && make check
RUNTESTFLAGS="conformance.exp=23_containers/mdspan/layouts/padded_neg.cc
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/x86_64-linux/libstdc++-v3/testsuite && make check
RUNTESTFLAGS="conformance.exp=23_containers/mdspan/layouts/padded_neg.cc
--target_board='unix{-m64}'"
$ cd {build_dir}/x86_64-linux/libstdc++-v3/testsuite && make check
RUNTESTFLAGS="conformance.exp=23_containers/mdspan/layouts/padded_neg.cc
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/x86_64-linux/libstdc++-v3/testsuite && make check
RUNTESTFLAGS="conformance.exp=23_containers/mdspan/submdspan/canonical_slices_neg.cc
--target_board='unix{-m32}'"
$ cd {build_dir}/x86_64-linux/libstdc++-v3/testsuite && make check
RUNTESTFLAGS="conformance.exp=23_containers/mdspan/submdspan/canonical_slices_neg.cc
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/x86_64-linux/libstdc++-v3/testsuite && make check
RUNTESTFLAGS="conformance.exp=23_containers/mdspan/submdspan/canonical_slices_neg.cc
--target_board='unix{-m64}'"
$ cd {build_dir}/x86_64-linux/libstdc++-v3/testsuite && make check
RUNTESTFLAGS="conformance.exp=23_containers/mdspan/submdspan/canonical_slices_neg.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.)
