From: Jonathan Wakely <jwakely@redhat.com>
To: Ken Matsui <kmatsui@gcc.gnu.org>
Cc: gcc-patches@gcc.gnu.org, libstdc++@gcc.gnu.org
Subject: Re: [PATCH v2] libstdc++: Define _GLIBCXX_HAS_BUILTIN_TRAIT
Date: Tue, 8 Aug 2023 21:23:19 +0100 [thread overview]
Message-ID: <CACb0b4m2_Ui0mSTyyNkY4EP0FTLs93i=iJK46a=Kyg8vKSsZZg@mail.gmail.com> (raw)
In-Reply-To: <20230719193242.59472-1-kmatsui@gcc.gnu.org>
[-- Attachment #1: Type: text/plain, Size: 1734 bytes --]
On Wed, 19 Jul 2023 at 20:33, Ken Matsui via Libstdc++ <
libstdc++@gcc.gnu.org> wrote:
> This patch defines _GLIBCXX_HAS_BUILTIN_TRAIT macro, which will be used
> as a flag to toggle the use of built-in traits in the type_traits header
> through _GLIBCXX_NO_BUILTIN_TRAITS macro, without needing to modify the
> source code.
>
> libstdc++-v3/ChangeLog:
>
> * include/bits/c++config (_GLIBCXX_HAS_BUILTIN_TRAIT): Define.
> (_GLIBCXX_HAS_BUILTIN): Keep defined.
>
I think this would be a little better as:
* include/bits/c++config (_GLIBCXX_HAS_BUILTIN): Do not undef.
(_GLIBCXX_HAS_BUILTIN_TRAIT): Define.
OK for trunk with that change, thanks.
>
> Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org>
> ---
> libstdc++-v3/include/bits/c++config | 10 +++++++++-
> 1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/libstdc++-v3/include/bits/c++config
> b/libstdc++-v3/include/bits/c++config
> index dd47f274d5f..984985d6fff 100644
> --- a/libstdc++-v3/include/bits/c++config
> +++ b/libstdc++-v3/include/bits/c++config
> @@ -854,7 +854,15 @@ namespace __gnu_cxx
> # define _GLIBCXX_HAVE_BUILTIN_LAUNDER 1
> #endif
>
> -#undef _GLIBCXX_HAS_BUILTIN
> +// Returns 1 if _GLIBCXX_NO_BUILTIN_TRAITS is not defined and the compiler
> +// has a corresponding built-in type trait, 0 otherwise.
> +// _GLIBCXX_NO_BUILTIN_TRAITS can be defined to disable the use of
> built-in
> +// traits.
> +#ifndef _GLIBCXX_NO_BUILTIN_TRAITS
> +# define _GLIBCXX_HAS_BUILTIN_TRAIT(BT) _GLIBCXX_HAS_BUILTIN(BT)
> +#else
> +# define _GLIBCXX_HAS_BUILTIN_TRAIT(BT) 0
> +#endif
>
> // Mark code that should be ignored by the compiler, but seen by Doxygen.
> #define _GLIBCXX_DOXYGEN_ONLY(X)
> --
> 2.41.0
>
>
next prev parent reply other threads:[~2023-08-08 20:23 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-18 22:32 [PATCH] " Ken Matsui
2023-07-19 18:48 ` Patrick Palka
2023-07-19 19:31 ` Ken Matsui
2023-08-08 20:22 ` Jonathan Wakely
2023-07-19 19:32 ` [PATCH v2] " Ken Matsui
2023-07-20 16:05 ` Patrick Palka
2023-07-28 3:57 ` [PATCH v3 1/2] " Ken Matsui
2023-07-28 3:57 ` [PATCH v3 2/2] libstdc++: Use _GLIBCXX_HAS_BUILTIN_TRAIT Ken Matsui
2023-08-01 17:24 ` Patrick Palka
2023-08-08 20:23 ` Jonathan Wakely [this message]
2023-08-31 12:32 ` [PATCH v2] libstdc++: Define _GLIBCXX_HAS_BUILTIN_TRAIT Ken Matsui
2023-09-11 14:50 ` Jonathan Wakely
2023-09-11 14:58 ` Ken Matsui
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