# pcre.m4 - check for libpcre support

# Copyright (C) 2010-2017 Free Software Foundation, Inc.

# This file is free software; the Free Software Foundation

# gives unlimited permission to copy and/or distribute it,

# with or without modifications, as long as this notice is preserved.

AC_DEFUN([gl_FUNC_PCRE],

[

  AC_ARG_ENABLE([perl-regexp],

    AC_HELP_STRING([--disable-perl-regexp],

                   [disable perl-regexp (pcre) support]),

    [case $enableval in

       yes|no) test_pcre=$enableval;;

       *) AC_MSG_ERROR([invalid value $enableval for --disable-perl-regexp]);;

     esac],

    [test_pcre=maybe])

  AC_SUBST([PCRE_CFLAGS])

  AC_SUBST([PCRE_LIBS])

  use_pcre=no

  if test $test_pcre != no; then

    PKG_CHECK_MODULES([PCRE], [libpcre], [], [: ${PCRE_LIBS=-lpcre}])

    AC_CACHE_CHECK([for pcre_compile], [pcre_cv_have_pcre_compile],

      [pcre_saved_CFLAGS=$CFLAGS

       pcre_saved_LIBS=$LIBS

       CFLAGS="$CFLAGS $PCRE_CFLAGS"

       LIBS="$PCRE_LIBS $LIBS"

       AC_LINK_IFELSE(

         [AC_LANG_PROGRAM([[#include <pcre.h>

                          ]],

            [[pcre *p = pcre_compile (0, 0, 0, 0, 0);

              return !p;]])],

         [pcre_cv_have_pcre_compile=yes],

         [pcre_cv_have_pcre_compile=no])

       CFLAGS=$pcre_saved_CFLAGS

       LIBS=$pcre_saved_LIBS])

    if test "$pcre_cv_have_pcre_compile" = yes; then

      use_pcre=yes

    elif test $test_pcre = maybe; then

      AC_MSG_WARN([AC_PACKAGE_NAME will be built without pcre support.])

    else

      AC_MSG_ERROR([pcre support not available])

    fi

  fi

  if test $use_pcre = yes; then

    AC_DEFINE([HAVE_LIBPCRE], [1],

      [Define to 1 if you have the Perl Compatible Regular Expressions

       library (-lpcre).])

  else

    PCRE_CFLAGS=

    PCRE_LIBS=

  fi

])