Is this perhaps also related to this issue:

./configure --with-libedit
make 
/php-src/ext/readline/readline.c: In function ‘zif_readline_info’:
/php-src/ext/readline/readline.c:191:41: warning: implicit declaration of function ‘rl_extend_line_buffer’ [-Wimplicit-function-declaration]
  191 |                                         rl_extend_line_buffer(Z_STRLEN_P(value) + 1);
      |                                         ^~~~~~~~~~~~~~~~~~~~~

/usr/bin/ld: ext/readline/readline.o: in function `zif_readline_info':
/php-src/ext/readline/readline.c:191:(.text+0x747): undefined reference to `rl_extend_line_buffer'

The libedit is actually preferred library to use in PHP. See #13184 (readline library shouldn't even be an option to use in PHP).

Not at all related but was not aware of the libedit/libreadline differences.

The libedit is actually preferred library to use in PHP. See #13184 (readline library shouldn't even be an option to use in PHP).

Indeed, Licenses are NOT compatible, IMHO at some point we should drop libreadline support

The libedit is actually preferred library to use in PHP. See #13184 (readline library shouldn't even be an option to use in PHP).

Indeed, Licenses are NOT compatible, IMHO at some point we should drop libreadline support

Let s try it for next major release then (php 9 ?).

Quick check,

If seems rl_end is not updated on Linux with libedit

#if !defined(PHP_WIN32) && !HAVE_LIBEDIT
...
				rl_end = Z_STRLEN_P(value);

But may be returned

#ifndef PHP_WIN32
		} else if (zend_string_equals_literal_ci(what, "end")) {
			RETVAL_LONG(rl_end);
#endif

Faced the same trying to build 8.4.0_alpha3

Thank you, the PR allowed to pass tests

It works, thanks!

Will it cause the alpha3 tarball rebuild or better to wait for beta1?

Will it cause the alpha3 tarball rebuild or better to wait for beta1?

neither, there is alpha4.