Re: [r17-570 Regression] FAIL: g++.dg/torture/pr118521.C -O1 (test for excess errors) on Linux/x86_64

On Tue, May 19, 2026 at 11:29 AM Haochen Jiang <[email protected]>
wrote:

> On Linux/x86_64,
>
> 79e29562907b454cdb867195b34cf63156d2d0cc is the first bad commit
> commit 79e29562907b454cdb867195b34cf63156d2d0cc
> Author: Avi Kivity <[email protected]>
> Date:   Thu Feb 26 19:59:41 2026 +0200
>
>     libstdc++: optimize std::uninitialized_move{,_n}() to memcpy when
> possible [PR121789]
>
> caused
>
> FAIL: g++.dg/torture/pr118521.C   -O1  (test for excess errors)
>
> with GCC configured with
>
> ../../gcc/configure
> --prefix=/export/users3/haochenj/src/gcc-bisect/master/master/r17-570/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
>
>
Thanks, I already got this from Linaro's bot and am working to resolve it.


> To reproduce:
>
> $ cd {build_dir}/gcc && make check
> RUNTESTFLAGS="dg-torture.exp=g++.dg/torture/pr118521.C
> --target_board='unix{-m32}'"
> $ cd {build_dir}/gcc && make check
> RUNTESTFLAGS="dg-torture.exp=g++.dg/torture/pr118521.C
> --target_board='unix{-m32\ -march=cascadelake}'"
> $ cd {build_dir}/gcc && make check
> RUNTESTFLAGS="dg-torture.exp=g++.dg/torture/pr118521.C
> --target_board='unix{-m64}'"
> $ cd {build_dir}/gcc && make check
> RUNTESTFLAGS="dg-torture.exp=g++.dg/torture/pr118521.C
> --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.)
>