| 1 | ## --------------------------------- ## -*- Autoconf -*-
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| 2 | ## Check if --with-regex was given. ##
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| 3 | ## --------------------------------- ##
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| 4 | # Copyright (C) 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
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| 5 | # Free Software Foundation, Inc.
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| 6 | #
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| 7 | # This file is free software; the Free Software Foundation
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| 8 | # gives unlimited permission to copy and/or distribute it,
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| 9 | # with or without modifications, as long as this notice is preserved.
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| 10 |
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| 11 | # serial 7
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| 12 |
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| 13 | # AM_WITH_REGEX
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| 14 | # -------------
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| 15 | #
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| 16 | # The idea is to distribute rx.[hc] and regex.[hc] together, for a
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| 17 | # while. The WITH_REGEX symbol is used to decide which of regex.h or
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| 18 | # rx.h should be included in the application. If `./configure
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| 19 | # --with-regex' is given (the default), the package will use gawk's
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| 20 | # regex. If `./configure --without-regex', a check is made to see if
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| 21 | # rx is already installed, as with newer Linux'es. If not found, the
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| 22 | # package will use the rx from the distribution. If found, the
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| 23 | # package will use the system's rx which, on Linux at least, will
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| 24 | # result in a smaller executable file.
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| 25 | #
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| 26 | # FIXME: This macro seems quite obsolete now since rx doesn't seem to
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| 27 | # be maintained, while regex is.
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| 28 | AC_DEFUN([AM_WITH_REGEX],
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| 29 | [AC_PREREQ(2.50)dnl
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| 30 | AC_LIBSOURCES([rx.h, rx.c, regex.c, regex.h])dnl
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| 31 | AC_MSG_CHECKING([which of GNU rx or gawk's regex is wanted])
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| 32 | AC_ARG_WITH([regex],
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| 33 | [ --without-regex use GNU rx in lieu of gawk's regex for matching],
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| 34 | [test "$withval" = yes && am_with_regex=1],
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| 35 | [am_with_regex=1])
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| 36 | if test -n "$am_with_regex"; then
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| 37 | AC_MSG_RESULT([regex])
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| 38 | AC_DEFINE([WITH_REGEX], 1, [Define if using GNU regex])
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| 39 | AC_CACHE_CHECK([for GNU regex in libc], [am_cv_gnu_regex],
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| 40 | [AC_TRY_LINK([],
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| 41 | [extern int re_max_failures; re_max_failures = 1],
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| 42 | [am_cv_gnu_regex=yes],
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| 43 | [am_cv_gnu_regex=no])])
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| 44 | if test $am_cv_gnu_regex = no; then
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| 45 | AC_LIBOBJ([regex])
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| 46 | fi
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| 47 | else
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| 48 | AC_MSG_RESULT([rx])
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| 49 | AC_CHECK_FUNC([re_rx_search], , [AC_LIBOBJ([rx])])
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| 50 | fi[]dnl
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| 51 | ])
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| 52 |
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| 53 | AU_DEFUN([fp_WITH_REGEX], [AM_WITH_REGEX])
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