# FIND_PACKAGE_HANDLE_STANDARD_ARGS(NAME (DEFAULT_MSG|"Custom failure message") VAR1 ... )
#    This macro is intended to be used in FindXXX.cmake modules files.
#    It handles the REQUIRED and QUIET argument to FIND_PACKAGE() and
#    it also sets the <UPPERCASED_NAME>_FOUND variable.
#    The package is found if all variables listed are TRUE.
#    Example:
#
#    FIND_PACKAGE_HANDLE_STANDARD_ARGS(LibXml2 DEFAULT_MSG LIBXML2_LIBRARIES LIBXML2_INCLUDE_DIR)
#
#    LibXml2 is considered to be found, if both LIBXML2_LIBRARIES and 
#    LIBXML2_INCLUDE_DIR are valid. Then also LIBXML2_FOUND is set to TRUE.
#    If it is not found and REQUIRED was used, it fails with FATAL_ERROR, 
#    independent whether QUIET was used or not.
#    If it is found, the location is reported using the VAR1 argument, so 
#    here a message "Found LibXml2: /usr/lib/libxml2.so" will be printed out.
#    If the second argument is DEFAULT_MSG, the message in the failure case will 
#    be "Could NOT find LibXml2", if you don't like this message you can specify
#    your own custom failure message there.

macro(find_package_handle_standard_args _NAME _FAIL_MSG _VAR1)

  if ("${_FAIL_MSG}" STREQUAL "DEFAULT_MSG")
    if (${_NAME}_FIND_REQUIRED)
      set (_FAIL_MESSAGE "Could not find REQUIRED package ${_NAME}")
    else (${_NAME}_FIND_REQUIRED)
      set (_FAIL_MESSAGE "Could not find OPTIONAL package ${_NAME}")
    endif (${_NAME}_FIND_REQUIRED)
  else ("${_FAIL_MSG}" STREQUAL "DEFAULT_MSG")
    set (_FAIL_MESSAGE "${_FAIL_MSG}")
  endif ("${_FAIL_MSG}" STREQUAL "DEFAULT_MSG")

  string (TOUPPER ${_NAME} _NAME_UPPER)

  set (${_NAME_UPPER}_FOUND TRUE)
  if (NOT ${_VAR1})
    set (${_NAME_UPPER}_FOUND FALSE)
  endif (NOT ${_VAR1})

  foreach (_CURRENT_VAR ${ARGN})
    if (NOT ${_CURRENT_VAR})
      set (${_NAME_UPPER}_FOUND FALSE)
    endif (NOT ${_CURRENT_VAR})
  endforeach (_CURRENT_VAR)

  if (${_NAME_UPPER}_FOUND)
    if (NOT ${_NAME}_FIND_QUIETLY)
      message (STATUS "Found ${_NAME}: ${${_VAR1}}")
    endif (NOT ${_NAME}_FIND_QUIETLY)
  else (${_NAME_UPPER}_FOUND)
    if (${_NAME}_FIND_REQUIRED)
      message (FATAL_ERROR "${_FAIL_MESSAGE}")
    else (${_NAME}_FIND_REQUIRED)
      if (NOT ${_NAME}_FIND_QUIETLY)
        message (STATUS "${_FAIL_MESSAGE}")
      endif (NOT ${_NAME}_FIND_QUIETLY)
    endif (${_NAME}_FIND_REQUIRED)
  endif (${_NAME_UPPER}_FOUND)
endmacro(find_package_handle_standard_args)