[Bug 1940996]

[Cvs-commit]

The master branch has been updated by Paul Eggert
<eggert at sourceware.org>:

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

commit 0b5ca7c3e551e5502f3be3b06453324fe8604e82
Author: Paul Eggert <eggert at cs.ucla.edu>
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.

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https://bugs.launchpad.net/bugs/1940996

Title:
  test failure - test-regex

Status in grep:
  In Progress
Status in grep package in Ubuntu:
  New

Bug description:
  'test-regex' fails when building grep against glibc 2.34.
  Per commentary from grep upstream at https://debbugs.gnu.org/cgi/bugreport.cgi?bug=50069, 
  the test failure can be attributed to skew between the glibc built-in regex and the one that is found in the grep source code.

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