From: Jens Gustedt <Jens.Gustedt@inria.fr>
To: musl@lists.openwall.com
Subject: [musl] [C23 divers headers 14/17] C23: allow va_start to receive only one argument
Date: Wed, 31 May 2023 11:23:01 +0200 [thread overview]
Message-ID: <57b76f7276b3aacb71d91e08af12b705630e947b.1685522953.git.Jens.Gustedt@inria.fr> (raw)
In-Reply-To: <cover.1685522953.git.Jens.Gustedt@inria.fr>
C23 allows functions that only have ... and no other
arguments. Therefore the second argument to va_start, that was not
useful anymore, has been removed. For backwards compatibility it is
still possible to provide such an argument and the va_start macro has
to be adapted such that it is able to cope with one or two arguments.
---
include/stdarg.h | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/include/stdarg.h b/include/stdarg.h
index 3256f805..38db6257 100644
--- a/include/stdarg.h
+++ b/include/stdarg.h
@@ -1,5 +1,5 @@
-#ifndef _STDARG_H
-#define _STDARG_H
+#ifndef __STDC_VERSION_STDARG_H__
+#define __STDC_VERSION_STDARG_H__ 202311L
#ifdef __cplusplus
extern "C" {
@@ -9,7 +9,10 @@ extern "C" {
#include <bits/alltypes.h>
-#define va_start(v,l) __builtin_va_start(v,l)
+#define va_start(...) __va_start1(__VA_ARGS__ , 0, )
+#define __va_start1(...) __va_start2(__VA_ARGS__)
+#define __va_start2(v, l, ...) __builtin_va_start(v, l)
+
#define va_end(v) __builtin_va_end(v)
#define va_arg(v,l) __builtin_va_arg(v,l)
#define va_copy(d,s) __builtin_va_copy(d,s)
--
2.34.1
next prev parent reply other threads:[~2023-05-31 9:25 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-31 9:22 [musl] [C23 divers headers 00/17] Jens Gustedt
2023-05-31 9:22 ` [musl] [C23 divers headers 01/17] C23: add the WIDTH macros for the standard integer types Jens Gustedt
2023-05-31 9:22 ` [musl] [C23 divers headers 02/17] C23: Add the *_WIDTH macros to stdint.h Jens Gustedt
2023-05-31 9:22 ` [musl] [C23 divers headers 03/17] C23: add call_once to stdlib.h Jens Gustedt
2023-05-31 9:22 ` [musl] [C23 divers headers 04/17] C23: add timegm, gmtime_r and localtime_r to time.h in C23 mode Jens Gustedt
2023-05-31 9:22 ` [musl] [C23 divers headers 05/17] C23: memccpy, strdup and strndup are now standard C Jens Gustedt
2023-05-31 9:22 ` [musl] [C23 divers headers 06/17] C23: adapt setjmp.h Jens Gustedt
2023-05-31 9:22 ` [musl] [C23 divers headers 07/17] C23: change the noreturn functions in stdlib.h Jens Gustedt
2023-05-31 9:22 ` [musl] [C23 divers headers 08/17] C23: change the noreturn function in threads.h Jens Gustedt
2023-05-31 9:22 ` [musl] [C23 divers headers 09/17] C23: update stdbool.h Jens Gustedt
2023-05-31 12:58 ` Joakim Sindholt
2023-05-31 13:53 ` Jₑₙₛ Gustedt
2023-05-31 14:13 ` Joakim Sindholt
2023-05-31 14:18 ` Rich Felker
2023-05-31 14:19 ` Jₑₙₛ Gustedt
2023-05-31 9:22 ` [musl] [C23 divers headers 10/17] C23: remove the contents of stdalign.h Jens Gustedt
2023-05-31 9:22 ` [musl] [C23 divers headers 11/17] C23: remove the static_assert macro Jens Gustedt
2023-05-31 9:22 ` [musl] [C23 divers headers 12/17] C23: change the assert macro to ... arguments Jens Gustedt
2023-05-31 9:23 ` [musl] [C23 divers headers 13/17] C23: add the __STDC_VERSION_ASSERT_H__ macro Jens Gustedt
2023-05-31 9:23 ` Jens Gustedt [this message]
2023-05-31 9:23 ` [musl] [C23 divers headers 15/17] C23: add the unreachable macro Jens Gustedt
2023-05-31 9:23 ` [musl] [C23 divers headers 16/17] C23: add the nullptr_t type Jens Gustedt
2023-05-31 9:23 ` [musl] [C23 divers headers 17/17] C23: add the __STDC_VERSION_STDDEF_H__ macro Jens Gustedt
-- strict thread matches above, loose matches on Subject: below --
2023-05-24 12:54 [musl] [C23 divers headers 00/17] boring header update Jens Gustedt
2023-04-19 13:56 ` [musl] [C23 divers headers 14/17] C23: allow va_start to receive only one argument Jens Gustedt
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=57b76f7276b3aacb71d91e08af12b705630e947b.1685522953.git.Jens.Gustedt@inria.fr \
--to=jens.gustedt@inria.fr \
--cc=musl@lists.openwall.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://git.vuxu.org/mirror/musl/
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).