From: "k0kubun (Takashi Kokubun) via ruby-core" <ruby-core@...>
Date: 2025-07-14T21:48:37+00:00
Subject: [ruby-core:122770] [Ruby Bug#21497] building issue when using gcc15, because C23 is default

Issue #21497 has been updated by k0kubun (Takashi Kokubun).

Backport changed from 3.2: REQUIRED, 3.3: REQUIRED, 3.4: REQUIRED to 3.2: REQUIRED, 3.3: REQUIRED, 3.4: DONE

ruby_3_4 commit:782aef10bbdb63aba6d71e4f5f1876888c70efcb merged revision(s) commit:d77e02bd85ab7f841df8d473bac214b9a92a3506.

----------------------------------------
Bug #21497: building issue when using gcc15, because C23 is default
https://bugs.ruby-lang.org/issues/21497#change-114049

* Author: liuzx (Liu Z.)
* Status: Closed
* ruby -v: 3.2, 3.3, 3.4
* Backport: 3.2: REQUIRED, 3.3: REQUIRED, 3.4: DONE
----------------------------------------
https://github.com/ruby/ruby/pull/13736

1. for ruby 3.3, 3.4: when compiling using gcc 15 with "-flto -Werror=lto-type-mismatch", ext/io/console/extconf.h will have:

> #define HAVE_RB_IO_PATH 1
> #define HAVE_RB_IO_DESCRIPTOR 1
> #define HAVE_RB_IO_GET_WRITE_IO 1
> #define HAVE_RB_IO_CLOSED_P 1
> #define HAVE_RB_IO_OPEN_DESCRIPTOR 1

the build is failed with:

> console.c:1417:1: error: static declaration of ���rb_io_closed_p��� follows non-static declaration
>  1417 | rb_io_closed_p(VALUE io)
>       | ^~~~~~~~~~~~~~
> ../../.././include/ruby/io.h:385:7: note: previous declaration of ���rb_io_closed_p��� with type ���VALUE(VALUE)��� {aka ���long unsigned int(long un
signed int)���}
>   385 | VALUE rb_io_closed_p(VALUE io);
>       |       ^~~~~~~~~~~~~~

see https://bugs.gentoo.org/945643#c17 for more detail analysis

2. for ruby 3.2, 3.3, 3.4: when enable socks5 support, gcc15 will report:

> init.c:573:19: error: too many arguments to function ���Rconnect���; expected 0, have 3
>   573 |     return (VALUE)Rconnect(arg->fd, arg->sockaddr, arg->len);
>       |                   ^~~~~~~~ ~~~~~~~
> In file included from init.c:11:
> rubysocket.h:294:5: note: declared here
>   294 | int Rconnect();
>       |     ^~~~~~~~

> sockssocket.c:33:9: error: too many arguments to function ���SOCKSinit���; expected 0, have 1
>    33 |         SOCKSinit("ruby");
>       |         ^~~~~~~~~ ~~~~~~
> In file included from sockssocket.c:11:
> rubysocket.h:293:6: note: declared here
>   293 | void SOCKSinit();
>       |      ^~~~~~~~~




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