From: Christophe Lyon <christophe.lyon.oss@gmail.com>
To: Jonathan Wakely <jwakely@redhat.com>
Cc: libstdc++@gcc.gnu.org, GCC Patches <gcc-patches@gcc.gnu.org>
Subject: Re: [committed 2/2] libstdc++: Add [[nodiscard]] to sequence containers
Date: Thu, 5 Aug 2021 14:09:52 +0200 [thread overview]
Message-ID: <CAKhMtSL8mzfM84NHJF3PU3HQBJ8BGDWuF+s-xTdfm_KSDeGwAA@mail.gmail.com> (raw)
In-Reply-To: <YQqBTnWKbu+04nM5@redhat.com>
Hi Jonathan,
On Wed, Aug 4, 2021 at 2:04 PM Jonathan Wakely via Gcc-patches <
gcc-patches@gcc.gnu.org> wrote:
> On 04/08/21 12:56 +0100, Jonathan Wakely wrote:
> >... and container adaptors.
> >
> >This adds the [[nodiscard]] attribute to functions with no side-effects
> >for the sequence containers and their iterators, and the debug versions
> >of those containers, and the container adaptors,
>
> I don't plan to add any more [[nodiscard]] attributes for now, but
> these two commits should demonstrate how to do it for anybody who
> wants to contribute similar patches.
>
> I didn't add tests that verify we do actually warn on each of those
> functions, because there are hundreds of them, and I know they're
> working because I had to alter existing tests to not warn.
>
>
I've noticed a regression on aarch64/arm:
FAIL: g++.old-deja/g++.other/inline7.C -std=gnu++17 (test for excess
errors)
Excess errors:
/gcc/testsuite/g++.old-deja/g++.other/inline7.C:11:11: warning: ignoring
return value of 'std::__cxx11::list<_Tp, _Alloc>::size_type
std::__cxx11::list<_Tp, _Alloc>::size() const [with _Tp = int*; _Alloc =
std::allocator<int*>; std::__cxx11::list<_Tp, _Alloc>::size_type = long
unsigned int]', declared with attribute 'nodiscard' [-Wunused-result]
FAIL: g++.old-deja/g++.other/inline7.C -std=gnu++2a (test for excess
errors)
Excess errors:
/gcc/testsuite/g++.old-deja/g++.other/inline7.C:11:11: warning: ignoring
return value of 'std::__cxx11::list<_Tp, _Alloc>::size_type
std::__cxx11::list<_Tp, _Alloc>::size() const [with _Tp = int*; _Alloc =
std::allocator<int*>; std::__cxx11::list<_Tp, _Alloc>::size_type = long
unsigned int]', declared with attribute 'nodiscard' [-Wunused-result]
Not sure why you didn't see it?
Christophe
next prev parent reply other threads:[~2021-08-05 12:10 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-04 11:55 [committed 1/2] libstdc++: Add [[nodiscard]] to iterators and related utilities Jonathan Wakely
2021-08-04 11:56 ` [committed 2/2] libstdc++: Add [[nodiscard]] to sequence containers Jonathan Wakely
2021-08-04 12:00 ` Jonathan Wakely
2021-08-05 12:09 ` Christophe Lyon [this message]
2021-08-05 12:13 ` Ville Voutilainen
2021-08-05 14:21 ` Jonathan Wakely
2021-08-05 14:38 ` Jonathan Wakely
2021-08-05 14:19 ` [committed] libstdc++: Move attributes that follow requires-clauses [PR101782] Jonathan Wakely
2021-08-05 14:27 ` Ville Voutilainen
2021-08-05 14:40 ` Jonathan Wakely
2021-08-05 18:02 ` Jonathan Wakely
2021-08-06 13:29 ` Jonathan Wakely
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