From: Adhemerval Zanella Netto <adhemerval.zanella@linaro.org>
To: Fangrui Song <maskray@google.com>
Cc: libc-alpha@sourceware.org
Subject: Re: [PATCH 09/11] alloc_buffer: Apply asm redirection before first use
Date: Mon, 31 Oct 2022 17:01:49 -0300 [thread overview]
Message-ID: <67004073-ddb0-6ac8-a6ed-4b47f4792d90@linaro.org> (raw)
In-Reply-To: <20221029003200.y7tuyn55d6qpwv4z@google.com>
On 28/10/22 21:32, Fangrui Song wrote:
> On 2022-10-28, Adhemerval Zanella via Libc-alpha wrote:
>> Compilers may not be able to apply asm redirections to functions after
>> these functions are used for the first time, e.g. clang 13.
Ack.
>
> You may say "clang 15". (clang 15.0.x has been released and clang still doesn't support this.
> I think this is very difficult to support.... https://maskray.me/blog/2021-10-10-when-can-glibc-be-built-with-clang#asm-label-after-first-use
> "Clang's one-function-at-a-time parsing and code generation strategy.")
>
>
> Thanks. This fixed
> > In file included from mntent.c:21:
> ../include/allocate_once.h:92:20: error: cannot apply asm label to function after its first use
> libc_hidden_proto (__libc_allocate_once_slow)
> ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
> ./../include/libc-symbols.h:613:58: note: expanded from macro 'libc_hidden_proto'
> # define libc_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
> ~~~~~~~~~~~~~~^~~~~~~~~~~~~~
> ./../include/libc-symbols.h:513:19: note: expanded from macro 'hidden_proto'
> __hidden_proto (name, , __GI_##name, ##attrs)
> ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> ./../include/libc-symbols.h:519:33: note: expanded from macro '__hidden_proto'
> extern thread __typeof (name) name __asm__ (__hidden_asmname (#internal)) \
> ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 1 error generated.
>
>
> Reviewed-by: Fangrui Song <maskray@google.com>
Thanks.
next prev parent reply other threads:[~2022-10-31 20:01 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-28 17:35 [PATCH 00/11] Initial fixes for clang build support Adhemerval Zanella
2022-10-28 17:35 ` [PATCH 01/11] stdlib/longlong.h: Remove incorrect lvalue to rvalue conversion from asm output constraints Adhemerval Zanella
2022-10-28 21:05 ` Joseph Myers
2022-10-28 21:32 ` Fangrui Song
2022-10-31 18:32 ` Adhemerval Zanella Netto
2022-11-01 13:56 ` Adhemerval Zanella Netto
2022-11-01 14:18 ` Joseph Myers
2022-11-01 17:05 ` Adhemerval Zanella Netto
2022-11-02 15:14 ` Cristian Rodríguez
2022-11-02 17:10 ` Adhemerval Zanella Netto
2022-11-02 19:43 ` Cristian Rodríguez
2022-11-03 12:17 ` Adhemerval Zanella Netto
2022-11-01 17:11 ` Andrew Pinski
2022-11-06 19:30 ` Fangrui Song
2022-11-06 19:32 ` Fangrui Song
2022-11-07 13:39 ` Adhemerval Zanella Netto
2022-10-28 17:35 ` [PATCH 02/11] Disable __USE_EXTERN_INLINES for clang Adhemerval Zanella
2022-10-28 21:06 ` Joseph Myers
2022-10-28 22:02 ` Fangrui Song
2022-10-31 18:33 ` Adhemerval Zanella Netto
2022-10-28 17:35 ` [PATCH 03/11] Rewrite find_cxx_header config configure.ac Adhemerval Zanella
2022-10-29 4:03 ` Fangrui Song
2022-10-31 19:30 ` Adhemerval Zanella Netto
2022-10-28 17:35 ` [PATCH 04/11] linux: Move hidden_proto before static inline usage on not-cancel.h Adhemerval Zanella
2022-10-29 4:23 ` Fangrui Song
2022-10-31 19:48 ` Adhemerval Zanella Netto
2022-10-28 17:35 ` [PATCH 05/11] intl: Fix clang -Wunused-but-set-variable on plural.c Adhemerval Zanella
2022-10-29 0:44 ` Fangrui Song
2022-10-31 19:54 ` Adhemerval Zanella Netto
2022-10-28 17:35 ` [PATCH 06/11] Disable use of -fsignaling-nans if compiler does not support it Adhemerval Zanella
2022-10-29 4:19 ` Fangrui Song
2022-10-31 20:01 ` Fangrui Song
2022-10-28 17:35 ` [PATCH 07/11] stdlib: Move attribute_hidden definition to function prototype at gmp.h Adhemerval Zanella
2022-10-29 4:37 ` Fangrui Song
2022-10-31 19:55 ` Adhemerval Zanella Netto
2022-10-28 17:35 ` [PATCH 08/11] configure: Use -Wno-ignored-attributes if compiler warns about multiple aliases Adhemerval Zanella
2022-10-29 5:59 ` Fangrui Song
2022-10-31 19:59 ` Adhemerval Zanella Netto
2022-10-31 20:11 ` Fangrui Song
2022-10-28 17:35 ` [PATCH 09/11] alloc_buffer: Apply asm redirection before first use Adhemerval Zanella
2022-10-29 0:32 ` Fangrui Song
2022-10-31 20:01 ` Adhemerval Zanella Netto [this message]
2022-10-28 17:35 ` [PATCH 10/11] allocate_once: " Adhemerval Zanella
2022-10-29 0:34 ` Fangrui Song
2022-10-28 17:35 ` [PATCH 11/11] nptl: Fix pthread_create.c build with clang Adhemerval Zanella
2022-10-29 4:51 ` Fangrui Song
2022-10-31 20:03 ` Adhemerval Zanella Netto
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