Re: [r16-4709 Regression] FAIL: g++.dg/warn/uninit-pr105562.C -std=gnu++26 (test for excess errors) on Linux/x86_64

On Wed, 29 Oct 2025 at 20:04, Haochen Jiang <[email protected]> wrote:
>
> On Linux/x86_64,
>
> c55c1de3a9adb241e3c0dabd7d1edd8ebe9c065f is the first bad commit
> commit c55c1de3a9adb241e3c0dabd7d1edd8ebe9c065f
> Author: Jonathan Wakely <[email protected]>
> Date:   Tue Oct 28 12:15:52 2025 +0000
>
>     libstdc++: Simplify std::regex_traits::value
>
> caused
>
> FAIL: g++.dg/warn/uninit-pr105562.C  -std=gnu++11 (test for excess errors)
> FAIL: g++.dg/warn/uninit-pr105562.C  -std=gnu++17 (test for excess errors)
> FAIL: g++.dg/warn/uninit-pr105562.C  -std=gnu++26 (test for excess errors)
>
> with GCC configured with
>
> ../../gcc/configure --prefix=/export/users3/haochenj/src/gcc-bisect/master/master/r16-4709/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="dg.exp=g++.dg/warn/uninit-pr105562.C --target_board='unix{-m32}'"
> $ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=g++.dg/warn/uninit-pr105562.C --target_board='unix{-m32\ -march=cascadelake}'"
> $ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=g++.dg/warn/uninit-pr105562.C --target_board='unix{-m64}'"
> $ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=g++.dg/warn/uninit-pr105562.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.)

Fixed at  r16-4714-gcc78f8523832d6