| 1 | #serial 5001
|
|---|
| 2 |
|
|---|
| 3 | dnl Initially derived from code in GNU grep.
|
|---|
| 4 | dnl Mostly written by Jim Meyering.
|
|---|
| 5 |
|
|---|
| 6 | dnl Usage: jm_INCLUDED_REGEX([lib/regex.c])
|
|---|
| 7 | dnl
|
|---|
| 8 | AC_DEFUN(jm_INCLUDED_REGEX,
|
|---|
| 9 | [
|
|---|
| 10 | dnl Even packages that don't use regex.c can use this macro.
|
|---|
| 11 | dnl Of course, for them it doesn't do anything.
|
|---|
| 12 |
|
|---|
| 13 | # Assume we'll default to using the included regex.c.
|
|---|
| 14 | ac_use_included_regex=yes
|
|---|
| 15 |
|
|---|
| 16 | # However, if the system regex support is good enough that it passes the
|
|---|
| 17 | # the following run test, then default to *not* using the included regex.c.
|
|---|
| 18 | # If cross compiling, assume the test would fail and use the included
|
|---|
| 19 | # regex.c. The first failing regular expression is from `Spencer ere
|
|---|
| 20 | # test #75' in grep-2.3.
|
|---|
| 21 | AC_CACHE_CHECK([for working re_compile_pattern],
|
|---|
| 22 | jm_cv_func_working_re_compile_pattern,
|
|---|
| 23 | AC_TRY_RUN(
|
|---|
| 24 | changequote(<<, >>)dnl
|
|---|
| 25 | <<
|
|---|
| 26 | #include <stdio.h>
|
|---|
| 27 | #include <regex.h>
|
|---|
| 28 | int
|
|---|
| 29 | main ()
|
|---|
| 30 | {
|
|---|
| 31 | static struct re_pattern_buffer regex;
|
|---|
| 32 | const char *s;
|
|---|
| 33 | re_set_syntax (RE_SYNTAX_POSIX_EGREP);
|
|---|
| 34 | /* Add this third left square bracket, [, to balance the
|
|---|
| 35 | three right ones below. Otherwise autoconf-2.14 chokes. */
|
|---|
| 36 | s = re_compile_pattern ("a[[:]:]]b\n", 9, ®ex);
|
|---|
| 37 | /* This should fail with _Invalid character class name_ error. */
|
|---|
| 38 | if (!s)
|
|---|
| 39 | exit (1);
|
|---|
| 40 |
|
|---|
| 41 | /* This should succeed, but doesn't for e.g. glibc-2.1.3. */
|
|---|
| 42 | s = re_compile_pattern ("{1", 2, ®ex);
|
|---|
| 43 |
|
|---|
| 44 | exit (s ? 1 : 0);
|
|---|
| 45 | }
|
|---|
| 46 | >>,
|
|---|
| 47 | changequote([, ])dnl
|
|---|
| 48 |
|
|---|
| 49 | jm_cv_func_working_re_compile_pattern=yes,
|
|---|
| 50 | jm_cv_func_working_re_compile_pattern=no,
|
|---|
| 51 | dnl When crosscompiling, assume it's broken.
|
|---|
| 52 | jm_cv_func_working_re_compile_pattern=no))
|
|---|
| 53 | if test $jm_cv_func_working_re_compile_pattern = yes; then
|
|---|
| 54 | ac_use_included_regex=no
|
|---|
| 55 | fi
|
|---|
| 56 |
|
|---|
| 57 | test -n "$1" || AC_MSG_ERROR([missing argument])
|
|---|
| 58 | syscmd([test -f $1])
|
|---|
| 59 | ifelse(sysval, 0,
|
|---|
| 60 | [
|
|---|
| 61 |
|
|---|
| 62 | AC_ARG_WITH(included-regex,
|
|---|
| 63 | [ --without-included-regex don't compile regex; this is the default on
|
|---|
| 64 | systems with version 2 of the GNU C library
|
|---|
| 65 | (use with caution on other system)],
|
|---|
| 66 | jm_with_regex=$withval,
|
|---|
| 67 | jm_with_regex=$ac_use_included_regex)
|
|---|
| 68 | if test "$jm_with_regex" = yes; then
|
|---|
| 69 | AC_LIBOBJ(regex)
|
|---|
| 70 | fi
|
|---|
| 71 | ],
|
|---|
| 72 | )
|
|---|
| 73 | ]
|
|---|
| 74 | )
|
|---|
