1# Ceres Solver - A fast non-linear least squares minimizer
2# Copyright 2014 Google Inc. All rights reserved.
3# http://code.google.com/p/ceres-solver/
4#
5# Redistribution and use in source and binary forms, with or without
6# modification, are permitted provided that the following conditions are met:
7#
8# * Redistributions of source code must retain the above copyright notice,
9#   this list of conditions and the following disclaimer.
10# * Redistributions in binary form must reproduce the above copyright notice,
11#   this list of conditions and the following disclaimer in the documentation
12#   and/or other materials provided with the distribution.
13# * Neither the name of Google Inc. nor the names of its contributors may be
14#   used to endorse or promote products derived from this software without
15#   specific prior written permission.
16#
17# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
21# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27# POSSIBILITY OF SUCH DAMAGE.
28#
29# Author: alexs.mac@gmail.com (Alex Stewart)
30
31# By default, there is no easy way in CMake to set the value of a cache
32# variable without reinitialising it, which involves resetting its
33# associated help string.  This is particularly annoying for CMake options
34# where they need to programmatically updated.
35#
36# This function automates this process by getting the current help string
37# for the cache variable to update, then reinitialising it with the new
38# value, but with the original help string.
39FUNCTION(UPDATE_CACHE_VARIABLE VAR_NAME VALUE)
40  GET_PROPERTY(HELP_STRING CACHE ${VAR_NAME} PROPERTY HELPSTRING)
41  GET_PROPERTY(VAR_TYPE CACHE ${VAR_NAME} PROPERTY TYPE)
42  SET(${VAR_NAME} ${VALUE} CACHE ${VAR_TYPE} "${HELP_STRING}" FORCE)
43ENDFUNCTION()
44