mirror of
git://git.sv.gnu.org/coreutils
synced 2026-06-05 23:32:26 -04:00
Jim Meyering
38 lines
1.4 KiB
Plaintext
38 lines
1.4 KiB
Plaintext
## --------------------------------- ##
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## Check if --with-regex was given. ##
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## --------------------------------- ##
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# serial 1
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# The idea is to distribute rx.[hc] and regex.[hc] together, for a while.
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# The WITH_REGEX symbol (which should also be documented in acconfig.h)
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# is used to decide which of regex.h or rx.h should be included in the
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# application. If `./configure --with-regex' is given (the default), the
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# package will use gawk's regex. If `./configure --without-regex', a
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# check is made to see if rx is already installed, as with newer Linux'es.
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# If not found, the package will use the rx from the distribution.
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# If found, the package will use the system's rx which, on Linux at least,
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# will result in a smaller executable file.
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AC_DEFUN(AM_WITH_REGEX,
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[AC_MSG_CHECKING(which of GNU rx or gawk's regex is wanted)
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AC_ARG_WITH(regex,
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[ --without-regex use GNU rx in lieu of gawk's regex for matching],
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[test "$withval" = yes && am_with_regex=1],
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[am_with_regex=1])
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if test -n "$am_with_regex"; then
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AC_MSG_RESULT(regex)
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AC_DEFINE(WITH_REGEX)
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AC_CACHE_CHECK([for GNU regex in libc], am_cv_gnu_regex,
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AC_TRY_LINK([], [extern int re_max_failures; re_max_failures = 1],
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am_cv_gnu_regex=yes, am_cv_gnu_regex=no))
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if test $am_cv_gnu_regex = no; then
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LIBOBJS="$LIBOBJS regex.o"
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fi
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else
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AC_MSG_RESULT(rx)
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AC_CHECK_FUNC(re_rx_search, , [LIBOBJS="$LIBOBJS rx.o"])
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fi
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AC_SUBST(LIBOBJS)dnl
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])
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