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Re: Can't build previous versions of Emacs?

From: Po Lu
Subject: Re: Can't build previous versions of Emacs?
Date: Thu, 14 Jul 2022 11:33:07 +0800
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.91 (gnu/linux)

Eric Abrahamsen <eric@ericabrahamsen.net> writes:

> Hi all,
> I have the Emacs 25, 26 and 27 branches checked out in git worktrees,
> and I was going to build them to test some backwards compatibility. On a
> clean checkout, "make" failed for all three of them with this error:
> sysdep.c:1795:22: error: variably modified ‘sigsegv_stack’ at file scope
>  1795 | static unsigned char sigsegv_stack[SIGSTKSZ];
>       |                      ^~~~~~~~~~~~~
> make[2]: *** [Makefile:377: sysdep.o] Error 1
> make[2]: Leaving directory '/home/eric/dev/emacs-26/src'
> make[1]: *** [Makefile:421: src] Error 2
> make[1]: Leaving directory '/home/eric/dev/emacs-26'
> make: *** [Makefile:1107: bootstrap] Error 2
> This is on Arch Linux, I can send the config.status file for any of the
> branches if that would help.

That's expected.  glibc recently changed in that SIGSTKSZ is now a call
to a function.  Emacs wasn't modified to be compatible with that until

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