Regression compile of emacs-27.1.tar.gz

Regression compile of emacs-27.1.tar.gz

[John Conover]

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I need to compile emacs-27.1.tar.xz, (the standard for Debian 11,
Bullseye,) on Debian 12, Bookworm, and prefer to compile the gnu
sources:

    Source: https://ftp.gnu.org/gnu/emacs/emacs-27.1.tar.xz:

        Compiler error:

            sysdep.c:1819:22: error: variably modified ‘sigsegv_stack’ at file scope
             1819 | static unsigned char sigsegv_stack[SIGSTKSZ];

Can this sigsegv_stack statement in sysdep.c be replaced with the same
statement from emacs-29.x.tar.xz, (which is quite different, but
compiles.)

Any consequences for that single change?

    Thanks,

    John

-- 

John Conover, conover@panix.com, http://www.johncon.com/

Re: Regression compile of emacs-27.1.tar.gz

[Stephen Berman]

On Wed, 20 Mar 2024 13:02:10 -0700 conover@panix.com (John Conover) wrote:

> I need to compile emacs-27.1.tar.xz, (the standard for Debian 11,
> Bullseye,) on Debian 12, Bookworm, and prefer to compile the gnu
> sources:
>
>     Source: https://ftp.gnu.org/gnu/emacs/emacs-27.1.tar.xz:
>
>         Compiler error:
>
>             sysdep.c:1819:22: error: variably modified ‘sigsegv_stack’ at file scope
>              1819 | static unsigned char sigsegv_stack[SIGSTKSZ];
>
> Can this sigsegv_stack statement in sysdep.c be replaced with the same
> statement from emacs-29.x.tar.xz, (which is quite different, but
> compiles.)

Yes, the change was made because SIGSTKSZ was removed from glibc 2.34,
see
https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=f97e07ea807cc6d38774a3888a15091b20645ac6

> Any consequences for that single change?

Besides being able to compile Emacs under glib 2.34 and later, none that
I'm aware of.

>     Thanks,
>
>     John

Steve Berman