| 1 | ## --------------------------------- ##
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| 2 | ## Check if --with-regex was given. ##
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| 3 | ## --------------------------------- ##
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| 4 |
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| 5 | # serial 1
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| 6 |
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| 7 | # The idea is to distribute rx.[hc] and regex.[hc] together, for a while.
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| 8 | # The WITH_REGEX symbol (which should also be documented in acconfig.h)
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| 9 | # is used to decide which of regex.h or rx.h should be included in the
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| 10 | # application. If `./configure --with-regex' is given (the default), the
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| 11 | # package will use gawk's regex. If `./configure --without-regex', a
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| 12 | # check is made to see if rx is already installed, as with newer Linux'es.
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| 13 | # If not found, the package will use the rx from the distribution.
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| 14 | # If found, the package will use the system's rx which, on Linux at least,
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| 15 | # will result in a smaller executable file.
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| 16 |
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| 17 | AC_DEFUN([AM_WITH_REGEX],
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| 18 | [AC_MSG_CHECKING(which of GNU rx or gawk's regex is wanted)
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| 19 | AC_ARG_WITH(regex,
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| 20 | [ --without-regex use GNU rx in lieu of gawk's regex for matching],
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| 21 | [test "$withval" = yes && am_with_regex=1],
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| 22 | [am_with_regex=1])
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| 23 | if test -n "$am_with_regex"; then
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| 24 | AC_MSG_RESULT(regex)
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| 25 | AC_DEFINE(WITH_REGEX,1,[Define if using GNU regex])
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| 26 | AC_CACHE_CHECK([for GNU regex in libc], am_cv_gnu_regex,
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| 27 | AC_TRY_LINK([], [extern int re_max_failures; re_max_failures = 1],
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| 28 | am_cv_gnu_regex=yes, am_cv_gnu_regex=no))
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| 29 | if test $am_cv_gnu_regex = no; then
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| 30 | LIBOBJS="$LIBOBJS regex.o"
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| 31 | fi
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| 32 | else
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| 33 | AC_MSG_RESULT(rx)
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| 34 | AC_CHECK_FUNC(re_rx_search, , [LIBOBJS="$LIBOBJS rx.o"])
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| 35 | fi
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| 36 | AC_SUBST(LIBOBJS)dnl
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| 37 | ])
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