# Ceres Solver - A fast non-linear least squares minimizer

# Copyright 2015 Google Inc. All rights reserved.

# http://ceres-solver.org/

#

# Redistribution and use in source and binary forms, with or without

# modification, are permitted provided that the following conditions are met:

#

# * Redistributions of source code must retain the above copyright notice,

#   this list of conditions and the following disclaimer.

# * Redistributions in binary form must reproduce the above copyright notice,

#   this list of conditions and the following disclaimer in the documentation

#   and/or other materials provided with the distribution.

# * Neither the name of Google Inc. nor the names of its contributors may be

#   used to endorse or promote products derived from this software without

#   specific prior written permission.

#

# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE

# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

# POSSIBILITY OF SUCH DAMAGE.

#

# Author: alexs.mac@gmail.com (Alex Stewart)

# Append item(s) to a property on a declared CMake target:

#

#    append_target_property(target property item_to_append1

#                                           [... item_to_appendN])

#

# The set_target_properties() CMake function will overwrite the contents of the

# specified target property.  This function instead appends to it, so can

# be called multiple times with the same target & property to iteratively

# populate it.

function(append_target_property TARGET PROPERTY)

  if (NOT TARGET ${TARGET})

    message(FATAL_ERROR "Invalid target: ${TARGET} cannot append: ${ARGN} "

      "to property: ${PROPERTY}")

  endif()

  if (NOT PROPERTY)

    message(FATAL_ERROR "Invalid property to update for target: ${TARGET}")

  endif()

  # Get the initial state of the specified property for the target s/t

  # we can append to it (not overwrite it).

  get_target_property(INITIAL_PROPERTY_STATE ${TARGET} ${PROPERTY})

  if (NOT INITIAL_PROPERTY_STATE)

    # Ensure that if the state is unset, we do not insert the XXX-NOTFOUND

    # returned by CMake into the property.

    set(INITIAL_PROPERTY_STATE "")

  endif()

  # Delistify (remove ; separators) the potentially set of items to append

  # to the specified target property.

  string(REPLACE ";" " " ITEMS_TO_APPEND "${ARGN}")

  set_target_properties(${TARGET} PROPERTIES ${PROPERTY}

    "${INITIAL_PROPERTY_STATE} ${ITEMS_TO_APPEND}")

endfunction()