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#serial 20
dnl Initially derived from code in GNU grep.
dnl Mostly written by Jim Meyering.
AC_DEFUN([gl_REGEX],
[
jm_INCLUDED_REGEX([lib/regex.c])
])
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(
[#include <stdio.h>
#include <string.h>
#include <regex.h>
int
main ()
{
static struct re_pattern_buffer regex;
const char *s;
struct re_registers regs;
re_set_syntax (RE_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 doesn't 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 doesn't 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 didn't
work with a negative RANGE argument. */
if (re_search (®ex, "wxy", 3, 2, -2, ®s) != 1)
exit (1);
exit (0);
}
],
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])
m4_syscmd([test -f $1])
ifelse(m4_sysval, 0,
[
AC_ARG_WITH(included-regex,
[ --without-included-regex don't compile regex; this is the default on
systems with version 2 of the GNU C library
(use with caution on other system)],
jm_with_regex=$withval,
jm_with_regex=$ac_use_included_regex)
if test "$jm_with_regex" = yes; then
AC_LIBOBJ(regex)
jm_PREREQ_REGEX
fi
],
)
]
)
# Prerequisites of lib/regex.c.
AC_DEFUN([jm_PREREQ_REGEX],
[
dnl FIXME: Maybe provide a btowc replacement someday: Solaris 2.5.1 lacks it.
dnl FIXME: Check for wctype and iswctype, and and add -lw if necessary
dnl to get them.
dnl Persuade glibc <string.h> to declare mempcpy().
AC_REQUIRE([AC_GNU_SOURCE])
AC_REQUIRE([gl_C_RESTRICT])
AC_REQUIRE([AC_FUNC_ALLOCA])
AC_REQUIRE([AC_HEADER_STDC])
AC_CHECK_HEADERS_ONCE(wchar.h wctype.h)
AC_CHECK_FUNCS_ONCE(isascii mempcpy)
AC_CHECK_FUNCS(btowc)
])
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