ax_path_lib_pcre.m4

# ===========================================================================
#     https://www.gnu.org/software/autoconf-archive/ax_path_lib_pcre.html
# ===========================================================================
#
# SYNOPSIS
#
#   AX_PATH_LIB_PCRE [(A/NA)]
#
# DESCRIPTION
#
#   check for pcre lib and set PCRE_LIBS and PCRE_CFLAGS accordingly.
#
#   also provide --with-pcre option that may point to the $prefix of the
#   pcre installation - the macro will check $pcre/include and $pcre/lib to
#   contain the necessary files.
#
#   the usual two ACTION-IF-FOUND / ACTION-IF-NOT-FOUND are supported and
#   they can take advantage of the LIBS/CFLAGS additions.
#
# LICENSE
#
#   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
#
#   Copying and distribution of this file, with or without modification, are
#   permitted in any medium without royalty provided the copyright notice
#   and this notice are preserved.  This file is offered as-is, without any
#   warranty.

#serial 9

AC_DEFUN([AX_PATH_LIB_PCRE],[dnl
AC_MSG_CHECKING([lib pcre])
AC_ARG_WITH(pcre,
[  --with-pcre[[=prefix]]    compile xmlpcre part (via libpcre check)],,
     with_pcre="yes")
if test ".$with_pcre" = ".no" ; then
  AC_MSG_RESULT([disabled])
  m4_ifval($2,$2)
else
  AC_MSG_RESULT([(testing)])
  AC_CHECK_LIB(pcre, pcre_study)
  if test "$ac_cv_lib_pcre_pcre_study" = "yes" ; then
     PCRE_LIBS="-lpcre"
     AC_MSG_CHECKING([lib pcre])
     AC_MSG_RESULT([$PCRE_LIBS])
     m4_ifval($1,$1)
  else
     OLDLDFLAGS="$LDFLAGS" ; LDFLAGS="$LDFLAGS -L$with_pcre/lib"
     OLDCPPFLAGS="$CPPFLAGS" ; CPPFLAGS="$CPPFLAGS -I$with_pcre/include"
     AC_CHECK_LIB(pcre, pcre_compile)
     CPPFLAGS="$OLDCPPFLAGS"
     LDFLAGS="$OLDLDFLAGS"
     if test "$ac_cv_lib_pcre_pcre_compile" = "yes" ; then
        AC_MSG_RESULT(.setting PCRE_LIBS -L$with_pcre/lib -lpcre)
        PCRE_LIBS="-L$with_pcre/lib -lpcre"
        test -d "$with_pcre/include" && PCRE_CFLAGS="-I$with_pcre/include"
        AC_MSG_CHECKING([lib pcre])
        AC_MSG_RESULT([$PCRE_LIBS])
        m4_ifval($1,$1)
     else
        AC_MSG_CHECKING([lib pcre])
        AC_MSG_RESULT([no, (WARNING)])
        m4_ifval($2,$2)
     fi
  fi
fi
AC_SUBST([PCRE_LIBS])
AC_SUBST([PCRE_CFLAGS])
])