Re: [PATCH 4/4] libstdc++: Fix some freestanding test failures

[Jonathan Wakely <jwakely@redhat.com>]

On Wed, 5 Apr 2023 at 00:13, Arsen Arsenović via Libstdc++
<libstdc++@gcc.gnu.org> wrote:
>
> At some point, <charconv> was added to the non-hosted bit of the C++17
> block, which induced failures in many tests.
>
> In addition, some tests also lacked a dg-require-effective-target hosted
> tag.
>
> libstdc++-v3/ChangeLog:
>
>         * include/precompiled/stdc++.h (C++17): Don't double-include
>         <charconv>, once with wrong conditions.
>         * testsuite/18_support/96817.cc: Require hosted.
>         * testsuite/18_support/bad_exception/59392.cc: Ditto.
>         * testsuite/20_util/scoped_allocator/108952.cc: Ditto.
>         * testsuite/20_util/uses_allocator/lwg3527.cc: Ditto.

Maybe this could be adjusted to not use std::allocator.

>         * testsuite/29_atomics/atomic/operators/pointer_partial_void.cc:

This fails because std::abs s not freestanding (which is surprising,
at least for the integral overloads).
We could adjust the test to define its own abs but maybe it's not worth it.

OK for trunk.

>         Ditto.
> ---
>  libstdc++-v3/include/precompiled/stdc++.h                        | 1 -
>  libstdc++-v3/testsuite/18_support/96817.cc                       | 1 +
>  libstdc++-v3/testsuite/18_support/bad_exception/59392.cc         | 1 +
>  libstdc++-v3/testsuite/20_util/scoped_allocator/108952.cc        | 1 +
>  libstdc++-v3/testsuite/20_util/uses_allocator/lwg3527.cc         | 1 +
>  .../29_atomics/atomic/operators/pointer_partial_void.cc          | 1 +
>  6 files changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/libstdc++-v3/include/precompiled/stdc++.h b/libstdc++-v3/include/precompiled/stdc++.h
> index bc011986b53..176ad79ff3c 100644
> --- a/libstdc++-v3/include/precompiled/stdc++.h
> +++ b/libstdc++-v3/include/precompiled/stdc++.h
> @@ -75,7 +75,6 @@
>
>  #if __cplusplus >= 201703L
>  #include <any>
> -#include <charconv>
>  // #include <execution>
>  #include <optional>
>  #include <variant>
> diff --git a/libstdc++-v3/testsuite/18_support/96817.cc b/libstdc++-v3/testsuite/18_support/96817.cc
> index 70938812bd8..073fc337e8f 100644
> --- a/libstdc++-v3/testsuite/18_support/96817.cc
> +++ b/libstdc++-v3/testsuite/18_support/96817.cc
> @@ -17,6 +17,7 @@
>
>  // { dg-do run }
>  // { dg-additional-options "-pthread" { target pthread } }
> +// { dg-require-effective-target hosted }
>
>  // Static init cannot detect recursion for gthreads targets without futexes
>  // (and the futex case can only detect it if __libc_single_threaded==true).
> diff --git a/libstdc++-v3/testsuite/18_support/bad_exception/59392.cc b/libstdc++-v3/testsuite/18_support/bad_exception/59392.cc
> index ac64e6eddb2..ae972d0535d 100644
> --- a/libstdc++-v3/testsuite/18_support/bad_exception/59392.cc
> +++ b/libstdc++-v3/testsuite/18_support/bad_exception/59392.cc
> @@ -17,6 +17,7 @@
>
>  // { dg-options "-Wno-deprecated" }
>  // { dg-do run { target c++14_down } }
> +// { dg-require-effective-target hosted }
>
>  #include <exception>
>  #include <cstdlib>
> diff --git a/libstdc++-v3/testsuite/20_util/scoped_allocator/108952.cc b/libstdc++-v3/testsuite/20_util/scoped_allocator/108952.cc
> index a6b9c67498c..9342f453bf4 100644
> --- a/libstdc++-v3/testsuite/20_util/scoped_allocator/108952.cc
> +++ b/libstdc++-v3/testsuite/20_util/scoped_allocator/108952.cc
> @@ -1,4 +1,5 @@
>  // { dg-do compile { target c++11 } }
> +// { dg-require-effective-target hosted }
>
>  #include <scoped_allocator>
>
> diff --git a/libstdc++-v3/testsuite/20_util/uses_allocator/lwg3527.cc b/libstdc++-v3/testsuite/20_util/uses_allocator/lwg3527.cc
> index ae377f4b5a3..c5a7d513b31 100644
> --- a/libstdc++-v3/testsuite/20_util/uses_allocator/lwg3527.cc
> +++ b/libstdc++-v3/testsuite/20_util/uses_allocator/lwg3527.cc
> @@ -1,5 +1,6 @@
>  // { dg-options "-std=gnu++20" }
>  // { dg-do compile { target c++20 } }
> +// { dg-require-effective-target hosted }
>
>  #include <memory>
>
> diff --git a/libstdc++-v3/testsuite/29_atomics/atomic/operators/pointer_partial_void.cc b/libstdc++-v3/testsuite/29_atomics/atomic/operators/pointer_partial_void.cc
> index ddb63233a64..e5d221ed15a 100644
> --- a/libstdc++-v3/testsuite/29_atomics/atomic/operators/pointer_partial_void.cc
> +++ b/libstdc++-v3/testsuite/29_atomics/atomic/operators/pointer_partial_void.cc
> @@ -1,5 +1,6 @@
>  // { dg-do run { target { c++11_only || c++14_only } } }
>  // { dg-require-atomic-builtins "" }
> +// { dg-require-effective-target hosted }
>
>  // Copyright (C) 2012-2023 Free Software Foundation, Inc.
>  //
> --
> 2.40.0
>