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- ## --------------------------------- ##
- ## Check if --with-regex was given. ##
- ## --------------------------------- ##
-
- # serial 1
-
- # The idea is to distribute rx.[hc] and regex.[hc] together, for a while.
- # The WITH_REGEX symbol (which should also be documented in acconfig.h)
- # 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.
-
- AC_DEFUN(AM_WITH_REGEX,
- [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.o"
- fi
- else
- AC_MSG_RESULT(rx)
- AC_CHECK_FUNC(re_rx_search, , [LIBOBJS="$LIBOBJS rx.o"])
- fi
- AC_SUBST(LIBOBJS)dnl
- ])
-