Comment 14 for bug 1940996

The master branch has been updated by Paul Eggert <email address hidden>:

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=0b5ca7c3e551e5502f3be3b06453324fe8604e82

commit 0b5ca7c3e551e5502f3be3b06453324fe8604e82
Author: Paul Eggert <email address hidden>
Date: Tue Sep 21 07:47:45 2021 -0700

    regex: copy back from Gnulib

    Copy regex-related files back from Gnulib, to fix a problem with
    static checking of regex calls noted by Martin Sebor. This merges the
    following changes:

    * New macro __attribute_nonnull__ in misc/sys/cdefs.h, for use later
    when copying other files back from Gnulib.

    * Use __GNULIB_CDEFS instead of __GLIBC__ when deciding
    whether to include bits/wordsize.h etc.

    * Avoid duplicate entries in epsilon closure table.

    * New regex.h macro _REGEX_NELTS to let regexec say that its pmatch
    arg should contain nmatch elts. Use that for regexec, instead of
    __attr_access (which is incorrect).

    * New regex.h macro _Attr_access_ which is like __attr_access except
    portable to non-glibc platforms.

    * Add some DEBUG_ASSERTs to pacify gcc -fanalyzer and to catch
    recently-fixed performance bugs if they recur.

    * Add Gnulib-specific stuff to port the dynarray- and lock-using parts
    of regex code to non-glibc platforms.

    * Fix glibc bug 11053.

    * Avoid some undefined behavior when popping an empty fail stack.