AC_DEFUN([jm_INCLUDED_REGEX],
[
ac_use_included_regex=yes
AC_CACHE_CHECK([for working re_compile_pattern],
jm_cv_func_working_re_compile_pattern,
AC_TRY_RUN(
[ int
main ()
{
static struct re_pattern_buffer regex;
const char *s;
struct re_registers regs;
re_set_syntax (RE_SYNTAX_POSIX_EGREP);
[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. */
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>. */
s = re_compile_pattern ("[[anù]]*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);
exit (0);
}
],
jm_cv_func_working_re_compile_pattern=yes,
jm_cv_func_working_re_compile_pattern=no,
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)
fi
],
)
]
)