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				|  |  | +# Ceres Solver - A fast non-linear least squares minimizer
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				|  |  | +# Copyright 2015 Google Inc. All rights reserved.
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				|  |  | +# http://ceres-solver.org/
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				|  |  | +#
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				|  |  | +# Redistribution and use in source and binary forms, with or without
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				|  |  | +# modification, are permitted provided that the following conditions are met:
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				|  |  | +#
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				|  |  | +# * Redistributions of source code must retain the above copyright notice,
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				|  |  | +#   this list of conditions and the following disclaimer.
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				|  |  | +# * Redistributions in binary form must reproduce the above copyright notice,
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				|  |  | +#   this list of conditions and the following disclaimer in the documentation
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				|  |  | +#   and/or other materials provided with the distribution.
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				|  |  | +# * Neither the name of Google Inc. nor the names of its contributors may be
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				|  |  | +#   used to endorse or promote products derived from this software without
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				|  |  | +#   specific prior written permission.
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				|  |  | +#
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				|  |  | +# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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				|  |  | +# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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				|  |  | +# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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				|  |  | +# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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				|  |  | +# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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				|  |  | +# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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				|  |  | +# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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				|  |  | +# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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				|  |  | +# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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				|  |  | +# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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				|  |  | +# POSSIBILITY OF SUCH DAMAGE.
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				|  |  | +#
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				|  |  | +# Author: alexs.mac@gmail.com (Alex Stewart)
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				|  |  | +#
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				|  |  | +
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				|  |  | +# Extract Ceres version from <CERES_SOURCE_ROOT>/include/ceres/version.h
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				|  |  | +# so that we only have a single definition of the Ceres version, not two
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				|  |  | +# one in the source and one in the CMakeLists.txt.
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				|  |  | +macro(read_ceres_version_from_source CERES_SOURCE_ROOT)
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				|  |  | +  set(CERES_VERSION_FILE ${CERES_SOURCE_ROOT}/include/ceres/version.h)
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				|  |  | +  if (NOT EXISTS ${CERES_VERSION_FILE})
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				|  |  | +    message(FATAL_ERROR "Cannot find Ceres version.h file in specified "
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				|  |  | +      "Ceres source directory: ${CERES_SOURCE_ROOT}, it is not here: "
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				|  |  | +      "${CERES_VERSION_FILE}")
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				|  |  | +  endif()
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				|  |  | +
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				|  |  | +  file(READ ${CERES_VERSION_FILE} CERES_VERSION_FILE_CONTENTS)
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				|  |  | +
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				|  |  | +  string(REGEX MATCH "#define CERES_VERSION_MAJOR [0-9]+"
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				|  |  | +    CERES_VERSION_MAJOR "${CERES_VERSION_FILE_CONTENTS}")
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				|  |  | +  string(REGEX REPLACE "#define CERES_VERSION_MAJOR ([0-9]+)" "\\1"
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				|  |  | +    CERES_VERSION_MAJOR "${CERES_VERSION_MAJOR}")
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				|  |  | +  # NOTE: if (VAR) is FALSE if VAR is numeric and <= 0, as such we cannot use
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				|  |  | +  #       it for testing version numbers, which might well be zero, at least
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				|  |  | +  #       for the patch version, hence check for empty string explicitly.
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				|  |  | +  if ("${CERES_VERSION_MAJOR}" STREQUAL "")
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				|  |  | +    message(FATAL_ERROR "Failed to extract Ceres major version from "
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				|  |  | +      "${CERES_VERSION_FILE}")
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				|  |  | +  endif()
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				|  |  | +
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				|  |  | +  string(REGEX MATCH "#define CERES_VERSION_MINOR [0-9]+"
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				|  |  | +    CERES_VERSION_MINOR "${CERES_VERSION_FILE_CONTENTS}")
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				|  |  | +  string(REGEX REPLACE "#define CERES_VERSION_MINOR ([0-9]+)" "\\1"
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				|  |  | +    CERES_VERSION_MINOR "${CERES_VERSION_MINOR}")
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				|  |  | +  if ("${CERES_VERSION_MINOR}" STREQUAL "")
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				|  |  | +    message(FATAL_ERROR "Failed to extract Ceres minor version from "
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				|  |  | +      "${CERES_VERSION_FILE}")
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				|  |  | +  endif()
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				|  |  | +
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				|  |  | +  string(REGEX MATCH "#define CERES_VERSION_REVISION [0-9]+"
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				|  |  | +    CERES_VERSION_PATCH "${CERES_VERSION_FILE_CONTENTS}")
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				|  |  | +  string(REGEX REPLACE "#define CERES_VERSION_REVISION ([0-9]+)" "\\1"
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				|  |  | +    CERES_VERSION_PATCH "${CERES_VERSION_PATCH}")
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				|  |  | +  if ("${CERES_VERSION_PATCH}" STREQUAL "")
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				|  |  | +    message(FATAL_ERROR "Failed to extract Ceres patch version from "
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				|  |  | +      "${CERES_VERSION_FILE}")
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				|  |  | +  endif()
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				|  |  | +
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				|  |  | +  # This is on a single line s/t CMake does not interpret it as a list of
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				|  |  | +  # elements and insert ';' separators which would result in 3.;2.;0 nonsense.
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				|  |  | +  set(CERES_VERSION "${CERES_VERSION_MAJOR}.${CERES_VERSION_MINOR}.${CERES_VERSION_PATCH}")
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				|  |  | +
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				|  |  | +  message(STATUS "Detected Ceres version: ${CERES_VERSION} from "
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				|  |  | +    "${CERES_VERSION_FILE}")
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				|  |  | +endmacro()
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