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#serial 29
# Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005 Free
# Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.
dnl Initially derived from code in GNU grep.
dnl Mostly written by Jim Meyering.
AC_PREREQ([2.50])
AC_DEFUN([gl_REGEX],
[
AC_REQUIRE([AC_SYS_LARGEFILE]) dnl for a sufficently-wide off_t
AC_DEFINE([_REGEX_LARGE_OFFSETS], 1,
[Define if you want regoff_t to be at least as wide POSIX requires.])
AC_LIBSOURCES(
[regcomp.c, regex.c, regex.h,
regex_internal.c, regex_internal.h, regexec.c])
AC_ARG_WITH([included-regex],
[AC_HELP_STRING([--without-included-regex],
[don't compile regex; this is the default on
systems with recent-enough versions of the GNU C
Library (use with caution on other systems)])])
case $with_included_regex in
yes|no) ac_use_included_regex=$with_included_regex
;;
'')
# 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],
[gl_cv_func_re_compile_pattern_broken],
[AC_RUN_IFELSE(
[AC_LANG_PROGRAM(
[AC_INCLUDES_DEFAULT
#include <regex.h>],
[[static struct re_pattern_buffer regex;
const char *s;
struct re_registers regs;
/* Use the POSIX-compliant spelling with leading REG_,
rather than the traditional GNU spelling with leading RE_,
so that we reject older libc implementations. */
re_set_syntax (REG_SYNTAX_POSIX_EGREP);
memset (®ex, 0, sizeof (regex));
s = re_compile_pattern ("a[:@:>@:]b\n", 9, ®ex);
/* This should fail with _Invalid character class name_ error. */
if (!s)
exit (1);
/* This should succeed, but does not for e.g. glibc-2.1.3. */
memset (®ex, 0, sizeof (regex));
s = re_compile_pattern ("{1", 2, ®ex);
if (s)
exit (1);
/* The following example is derived from a problem report
against gawk from Jorge Stolfi <stolfi@ic.unicamp.br>. */
memset (®ex, 0, sizeof (regex));
s = re_compile_pattern ("[an\371]*n", 7, ®ex);
if (s)
exit (1);
/* This should match, but does not for e.g. glibc-2.2.1. */
if (re_match (®ex, "an", 2, 0, ®s) != 2)
exit (1);
memset (®ex, 0, sizeof (regex));
s = re_compile_pattern ("x", 1, ®ex);
if (s)
exit (1);
/* The version of regex.c in e.g. GNU libc-2.2.93 did not
work with a negative RANGE argument. */
if (re_search (®ex, "wxy", 3, 2, -2, ®s) != 1)
exit (1);
/* The version of regex.c in older versions of gnulib
ignored REG_IGNORE_CASE (which was then called RE_ICASE).
Detect that problem too. */
memset (®ex, 0, sizeof (regex));
re_set_syntax (REG_SYNTAX_EMACS | REG_IGNORE_CASE);
s = re_compile_pattern ("x", 1, ®ex);
if (s)
exit (1);
if (re_search (®ex, "WXY", 3, 0, 3, ®s) < 0)
exit (1);
/* REG_STARTEND was added to glibc on 2004-01-15.
Reject older versions. */
if (! REG_STARTEND)
exit (1);
/* Reject hosts whose regoff_t values are too narrow.
These include glibc 2.3.5 on hosts with 64-bit off_t
and 32-bit int, and Solaris 10 on hosts with 32-bit int
and _FILE_OFFSET_BITS=64. */
if (sizeof (regoff_t) < sizeof (off_t))
exit (1);
exit (0);]])],
[gl_cv_func_re_compile_pattern_broken=no],
[gl_cv_func_re_compile_pattern_broken=yes],
dnl When crosscompiling, assume it is broken.
[gl_cv_func_re_compile_pattern_broken=yes])])
ac_use_included_regex=$gl_cv_func_re_compile_pattern_broken
;;
*) AC_MSG_ERROR([Invalid value for --with-included-regex: $with_included_regex])
;;
esac
if test $ac_use_included_regex = yes; then
AC_LIBOBJ([regex])
gl_PREREQ_REGEX
fi
])
# Prerequisites of lib/regex.c and lib/regex_internal.c.
AC_DEFUN([gl_PREREQ_REGEX],
[
AC_REQUIRE([AC_GNU_SOURCE])
AC_REQUIRE([gl_C_RESTRICT])
AC_REQUIRE([AM_LANGINFO_CODESET])
AC_CHECK_HEADERS_ONCE([locale.h wchar.h wctype.h])
AC_CHECK_FUNCS_ONCE([isblank mbrtowc mempcpy wcrtomb wcscoll])
])
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