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# FIND_PACKAGE_VERSION_CHECK(NAME (DEFAULT_MSG|"Custom failure message"))
# This function is intended to be used in FindXXX.cmake modules files.
# It handles NAME_FIND_VERSION and NAME_VERSION variables in a Module.
#
# Example:
# find_package(LibSSH 0.3.2)
#
# # check for the version and set it
# set(LibSSH_VERSION 0.3.0)
# find_package_version_check(LibSSH DEFAULT_MSG)
#
#
# Copyright (c) 2009 Andreas Schneider <mail@cynapses.org>
#
# Redistribution and use is allowed according to the terms of the New
# BSD license.
function(FIND_PACKAGE_VERSION_CHECK _NAME _FAIL_MSG)
string(TOUPPER ${_NAME} _NAME_UPPER)
set(_AGE "old")
if(${_NAME}_FIND_VERSION_EXACT)
if (${_NAME}_FIND_VERSION VERSION_EQUAL ${_NAME}_VERSION)
# exact version found
set(${_NAME_UPPER}_FOUND TRUE)
else (${_NAME}_FIND_VERSION VERSION_EQUAL ${_NAME}_VERSION)
# exect version not found
set(${_NAME_UPPER}_FOUND FALSE)
# check if newer or older
if (${_NAME}_FIND_VERSION VERSION_LESS ${_NAME}_VERSION)
set(_AGE "new")
else (${_NAME}_FIND_VERSION VERSION_LESS ${_NAME}_VERSION)
set(_AGE "old")
endif (${_NAME}_FIND_VERSION VERSION_LESS ${_NAME}_VERSION)
endif (${_NAME}_FIND_VERSION VERSION_EQUAL ${_NAME}_VERSION)
else (${_NAME}_FIND_VERSION_EXACT)
if (${_NAME}_FIND_VERSION)
if (${_NAME}_VERSION VERSION_LESS ${_NAME}_FIND_VERSION)
set(${_NAME_UPPER}_FOUND FALSE)
set(_AGE "old")
else (${_NAME}_VERSION VERSION_LESS ${_NAME}_FIND_VERSION)
set(${_NAME_UPPER}_FOUND TRUE)
endif (${_NAME}_VERSION VERSION_LESS ${_NAME}_FIND_VERSION)
endif (${_NAME}_FIND_VERSION)
endif(${_NAME}_FIND_VERSION_EXACT)
if ("${_FAIL_MSG}" STREQUAL "DEFAULT_MSG")
if (${_NAME}_FIND_VERSION_EXACT)
set(_FAIL_MESSAGE "The installed ${_NAME} version ${${_NAME}_VERSION} is too ${_AGE}, version ${${_NAME}_FIND_VERSION} is required.")
else (${_NAME}_FIND_VERSION_EXACT)
set(_FAIL_MESSAGE "The installed ${_NAME} version ${${_NAME}_VERSION} is too ${_AGE}, at least version ${${_NAME}_FIND_VERSION} is required.")
endif (${_NAME}_FIND_VERSION_EXACT)
else ("${_FAIL_MSG}" STREQUAL "DEFAULT_MSG")
set(_FAIL_MESSAGE "${_FAIL_MSG}")
endif ("${_FAIL_MSG}" STREQUAL "DEFAULT_MSG")
if (NOT ${_NAME_UPPER}_FOUND)
if (${_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 (NOT ${_NAME_UPPER}_FOUND)
set(${_NAME_UPPER}_FOUND ${${_NAME_UPPER}_FOUND} PARENT_SCOPE)
endfunction(FIND_PACKAGE_VERSION_CHECK)
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