maint: use regex from gnulib, rather than our bit-rotting one

* bootstrap.conf (gnulib_modules): Add regex.
* configure.ac: Don't use jm_INCLUDED_REGEX.
Update use of cache variable.
* lib/regex.c: Remove file.
* lib/regex.h: Likewise.
* m4/regex.m4: Likewise.
* POTFILES.in: Update to match.

1 files changed, 0 insertions, 74 deletions

diff --git a/m4/regex.m4 b/m4/regex.m4
deleted file mode 100644
index b313b5e1..00000000
--- a/m4/regex.m4
+++ /dev/null
@@ -1,74 +0,0 @@
-#serial 5001
-
-dnl Initially derived from code in GNU grep.
-dnl Mostly written by Jim Meyering.
-
-dnl Usage: jm_INCLUDED_REGEX([lib/regex.c])
-dnl
-AC_DEFUN([jm_INCLUDED_REGEX],
-  [
-    dnl Even packages that don't use regex.c can use this macro.
-    dnl Of course, for them it doesn't do anything.
-
-    # Assume we'll default to using the included regex.c.
-    ac_use_included_regex=yes
-
-    # However, if the system regex support is good enough that it passes the
-    # the following run test, then default to *not* using the included regex.c.
-    # If cross compiling, assume the test would fail and use the included
-    # regex.c.  The first failing regular expression is from `Spencer ere
-    # test #75' in grep-2.3.
-    AC_CACHE_CHECK([for working re_compile_pattern],
-		   jm_cv_func_working_re_compile_pattern,
-      AC_TRY_RUN(
-	changequote(<<, >>)dnl
-	<<
-#include <stdio.h>
-#include <regex.h>
-	  int
-	  main ()
-	  {
-	    static struct re_pattern_buffer regex;
-	    const char *s;
-	    re_set_syntax (RE_SYNTAX_POSIX_EGREP);
-	    /* Add this third left square bracket, [, to balance the
-	       three right ones below.  Otherwise autoconf-2.14 chokes.  */
-	    s = re_compile_pattern ("a[[:]:]]b\n", 9, &regex);
-	    /* This should fail with _Invalid character class name_ error.  */
-	    if (!s)
-	      exit (1);
-
-	    /* This should succeed, but doesn't for e.g. glibc-2.1.3.  */
-	    s = re_compile_pattern ("{1", 2, &regex);
-
-	   exit (s ? 1 : 0);
-	  }
-	>>,
-	changequote([, ])dnl
-
-	       jm_cv_func_working_re_compile_pattern=yes,
-	       jm_cv_func_working_re_compile_pattern=no,
-	       dnl When crosscompiling, assume it's broken.
-	       jm_cv_func_working_re_compile_pattern=no))
-    if test $jm_cv_func_working_re_compile_pattern = yes; then
-      ac_use_included_regex=no
-    fi
-
-    test -n "$1" || AC_MSG_ERROR([missing argument])
-    syscmd([test -f $1])
-    ifelse(sysval, 0,
-      [
-
-	AC_ARG_WITH(included-regex,
-	[  --without-included-regex don't compile regex; this is the default on
-                          systems with version 2 of the GNU C library
-                          (use with caution on other system)],
-		    jm_with_regex=$withval,
-		    jm_with_regex=$ac_use_included_regex)
-	if test "$jm_with_regex" = yes; then
-	  AC_LIBOBJ(regex)
-	fi
-      ],
-    )
-  ]
-)