# SYNOPSIS
#
#   AX_LOG4CXX()
#
# DESCRIPTION
#
#   Check installation of Apache C++ logging library log4cxx, version
#   0.10.0 or greater.
#   
#
# LAST MODIFICATION
#
#   2008-12-11

AC_DEFUN([AX_LOG4CXX],
[
  AC_LANG_PUSH([C++])

  AC_CHECK_HEADERS([[log4cxx/logger.h]],,
    [AC_MSG_ERROR([Could not find log4cxx headers (http://logging.apache.org/log4cxx/index.html)])
  ])

  AC_MSG_CHECKING([log4cxx library files (version >=0.10.0)])

  dnl Save old $LIBS to eventually restore it.
  ax_log4cxx_save_libs="$LIBS"
  LIBS="$LIBS -llog4cxx"
  
  AC_LINK_IFELSE([AC_LANG_PROGRAM(
    [[
#include <log4cxx/logger.h>
#include <log4cxx/basicconfigurator.h>
    ]], [
    log4cxx::BasicConfigurator::configure();
    log4cxx::LoggerPtr logger = log4cxx::Logger::getRootLogger();
    logger->setLevel(log4cxx::Level::getDebug());
    LOG4CXX_INFO(logger, "Simple message text.");])],
    dnl Success
    AC_MSG_RESULT(yes)
    [LIBS="-llog4cxx $LIBS"]
    AC_DEFINE(HAVE_LIBLOG4CXX, [1], "Define to 1 if you have log4cxx library installed")
    , dnl failed
    AC_MSG_RESULT(no)
    AC_MSG_FAILURE([[Could not find log4cxx library.
Version 0.10.0 or greater is required.
(http://logging.apache.org/log4cxx/index.html)]])
    dnl restore old lib state
    LIBS="$ax_log4cxx_save_libs")
    
  AC_LANG_POP
])