From: "François Dumont" <frs.dumont@gmail.com>
To: Jonathan Wakely <jwakely@redhat.com>
Cc: "libstdc++@gcc.gnu.org" <libstdc++@gcc.gnu.org>,
gcc-patches <gcc-patches@gcc.gnu.org>
Subject: Re: [PATCH][_GLIBCXX_INLINE_VERSION] Adapt to_chars/from_chars symbols
Date: Mon, 28 Nov 2022 19:45:27 +0100 [thread overview]
Message-ID: <5fbf8139-9f8c-9b56-eae3-8c441e6ad4ee@gmail.com> (raw)
In-Reply-To: <fa0bea1f-79c3-817c-e150-ebe46b2a3e24@gmail.com>
[-- Attachment #1: Type: text/plain, Size: 3121 bytes --]
I forgot to add the patch but as you already made another feedback I'll
clean my patch first.
On 28/11/22 19:43, François Dumont wrote:
> On 28/11/22 11:21, Jonathan Wakely wrote:
>>
>>
>> On Mon, 28 Nov 2022 at 10:10, Jonathan Wakely <jwakely@redhat.com> wrote:
>>
>>
>>
>> On Mon, 28 Nov 2022 at 06:07, François Dumont via Libstdc++
>> <libstdc++@gcc.gnu.org <mailto:libstdc%2B%2B@gcc.gnu.org>> wrote:
>>
>> This patch is fixing those tests:
>>
>> 20_util/to_chars/float128_c++23.cc
>> std/format/formatter/requirements.cc
>> std/format/functions/format.cc
>> std/format/functions/format_to_n.cc
>> std/format/functions/size.cc
>> std/format/functions/vformat_to.cc
>> std/format/string.cc
>>
>> Note that symbols used in <format> for __ibm128 and __iee128
>> are untested.
>>
>> I even wonder if the normal mode ones are because I cannot
>> find the
>> symbols used in gnu.ver.
>>
>>
>> libstdc++: [_GLIBCXX_INLINE_VERSION] Add
>> to_chars/from_chars
>> symbols export
>>
>> libstdc++-v3/ChangeLog
>>
>> * include/std/format
>> [_GLIBCXX_INLINE_VERSION](to_chars):
>> Adapt __asm symbol
>> specifications.
>> * config/abi/pre/gnu-versioned-namespace.ver: Add
>> to_chars/from_chars symbols
>> export.
>>
>> Ok to commit ?
>>
>>
>>
>> Why are changes needed to the linker script?
>>
>> Those functions should already match the general wildcard:
>>
>> # Names inside the 'extern' block are demangled names.
>> extern "C++"
>> {
>> std::*;
>> std::__8::*;
>> };
>>
>>
>>
> No idear, my guess was that it has something to do with the __asm
> usages in <format> and with the commnt:
>
> // These overloads exist in the library, but are not declared for C++20.
> // Make them available as std::__format::to_chars.
>
> Maybe they exist in the library but are unused so not exported unless
> specified in the linker script ?
>
>
>>
>> Instead of nine separate #if blocks, can we just do:
>>
>> #if _GLIBCXX_INLINE_VERSION
>> # define _GLIBCXX_ALIAS(S) __asm("_ZNSt3__8" S)
>> #else
>> # define _GLIBCXX_ALIAS(S) __asm("_ZNSt" S)
>> #endif
>>
>> And then use:
>>
>> _GLIBCXX_ALIAS("8to_charsPcS_eSt12chars_format");
>>
>> and finally:
>>
>> #undef _GLIBCXX_ALIAS
>>
>>
> I tried and as expected it's not working because the diff in the
> symbol is not limited to the '3__8' pattern. 'chars_format' is also
> defined in versioned namespace which might perhaps explain some
> mangling diff.
>
> Here is an updated patch though, I had forgotten to replace a _DF128
> with a __ieee128 in the untested part of this patch.
>
> If you prefer to take a closer look later I'll just re-submit my patch
> to move versioned namespace mode to cxx11 abi knowing that those tests
> are already FAIL.
>
> François
>
>
next prev parent reply other threads:[~2022-11-28 18:45 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-28 6:07 François Dumont
2022-11-28 10:10 ` Jonathan Wakely
2022-11-28 10:21 ` Jonathan Wakely
2022-11-28 18:43 ` François Dumont
2022-11-28 18:45 ` François Dumont [this message]
2022-11-28 18:35 ` Jonathan Wakely
2022-11-28 20:44 ` François Dumont
2023-01-12 12:05 ` Jonathan Wakely
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