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- ## --------------------------------- ##
- ## Check if --with-regex was given. ##
- ## --------------------------------- ##
-
- # serial 2
-
- # AM_WITH_REGEX
- # -------------
- #
- # The idea is to distribute rx.[hc] and regex.[hc] together, for a
- # while. The WITH_REGEX symbol is used to decide which of regex.h or
- # rx.h should be included in the application. If `./configure
- # --with-regex' is given (the default), the package will use gawk's
- # regex. If `./configure --without-regex', a check is made to see if
- # rx is already installed, as with newer Linux'es. If not found, the
- # package will use the rx from the distribution. If found, the
- # package will use the system's rx which, on Linux at least, will
- # result in a smaller executable file.
- #
- # FIXME: This macro seems quite obsolete now since rx doesn't seem to
- # be maintained, while regex is.
- AC_DEFUN([AM_WITH_REGEX],
- [ifdef([AC_LIBSOURCES],
- [AC_LIBSOURCES([rx.h, rx.c, regex.c, regex.h])])dnl
- AC_MSG_CHECKING([which of GNU rx or gawk's regex is wanted])
- AC_ARG_WITH(regex,
- [ --without-regex use GNU rx in lieu of gawk's regex for matching],
- [test "$withval" = yes && am_with_regex=1],
- [am_with_regex=1])
- if test -n "$am_with_regex"; then
- AC_MSG_RESULT(regex)
- AC_DEFINE(WITH_REGEX, 1, [Define if using GNU regex])
- AC_CACHE_CHECK([for GNU regex in libc], am_cv_gnu_regex,
- [AC_TRY_LINK([],
- [extern int re_max_failures; re_max_failures = 1],
- [am_cv_gnu_regex=yes],
- [am_cv_gnu_regex=no])])
- if test $am_cv_gnu_regex = no; then
- LIBOBJS="$LIBOBJS regex.$ac_objext"
- fi
- else
- AC_MSG_RESULT(rx)
- AC_CHECK_FUNC(re_rx_search, , [LIBOBJS="$LIBOBJS rx.$ac_objext"])
- fi
- AC_SUBST(LIBOBJS)dnl
- ])
-