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# Ceres Solver - A fast non-linear least squares minimizer
# Copyright 2023 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
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# 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)
# This must take place outside of CONFIGURE_CERES_CONFIG() in order that
# we can determine where *this* file is, and thus the relative path to
# config.h.in. Inside of CONFIGURE_CERES_CONFIG(), CMAKE_CURRENT_LIST_DIR
# refers to the caller of CONFIGURE_CERES_CONFIG(), not this file.
set(CERES_CONFIG_IN_FILE "${CMAKE_CURRENT_LIST_DIR}/config.h.in")
# CreateCeresConfig.cmake - Create the config.h for Ceres.
#
# This function configures the Ceres config.h file based on the current
# compile options and copies it into the specified location. It should be
# called before Ceres is built so that the correct config.h is used when
# Ceres is compiled.
#
# INPUTS:
# CURRENT_CERES_COMPILE_OPTIONS: List of currently enabled Ceres compile
# options. These are compared against the
# full list of valid options, which are read
# from config.h.in. Any options present
# which are not part of the valid set will
# invoke an error. Any valid option present
# will be enabled in the resulting config.h,
# all other options will be disabled.
#
# CERES_CONFIG_OUTPUT_DIRECTORY: Path to output directory in which to save
# the configured config.h. Typically this
# will be <src>/include/ceres/internal.
function(CREATE_CERES_CONFIG CURRENT_CERES_COMPILE_OPTIONS CERES_CONFIG_OUTPUT_DIRECTORY)
# Create the specified output directory if it does not exist.
if (NOT EXISTS "${CERES_CONFIG_OUTPUT_DIRECTORY}")
message(STATUS "Creating configured Ceres config.h output directory: "
"${CERES_CONFIG_OUTPUT_DIRECTORY}")
file(MAKE_DIRECTORY "${CERES_CONFIG_OUTPUT_DIRECTORY}")
endif()
if (EXISTS "${CERES_CONFIG_OUTPUT_DIRECTORY}" AND
NOT IS_DIRECTORY "${CERES_CONFIG_OUTPUT_DIRECTORY}")
message(FATAL_ERROR "Ceres Bug: Specified CERES_CONFIG_OUTPUT_DIRECTORY: "
"${CERES_CONFIG_OUTPUT_DIRECTORY} exists, but is not a directory.")
endif()
# Read all possible configurable compile options from config.h.in, this avoids
# us having to hard-code in this file what the valid options are.
file(READ ${CERES_CONFIG_IN_FILE} CERES_CONFIG_IN_CONTENTS)
string(REGEX MATCHALL "@[^@ $]+@"
ALL_CONFIGURABLE_CERES_OPTIONS "${CERES_CONFIG_IN_CONTENTS}")
# Removing @ symbols at beginning and end of each option.
string(REPLACE "@" ""
ALL_CONFIGURABLE_CERES_OPTIONS "${ALL_CONFIGURABLE_CERES_OPTIONS}")
# Ensure that there are no repetitions in the current compile options.
list(REMOVE_DUPLICATES CURRENT_CERES_COMPILE_OPTIONS)
foreach (CERES_OPTION ${ALL_CONFIGURABLE_CERES_OPTIONS})
# Try and find the option in the list of current compile options, if it
# is present, then the option is enabled, otherwise it is disabled.
list(FIND CURRENT_CERES_COMPILE_OPTIONS ${CERES_OPTION} OPTION_ENABLED)
# list(FIND ..) returns -1 if the element was not in the list, but CMake
# interprets if (VAR) to be true if VAR is any non-zero number, even
# negative ones, hence we have to explicitly check for >= 0.
if (OPTION_ENABLED GREATER -1)
message(STATUS "Enabling ${CERES_OPTION} in Ceres config.h")
set(${CERES_OPTION} "#define ${CERES_OPTION}")
# Remove the item from the list of current options so that we can identify
# any options that were in CURRENT_CERES_COMPILE_OPTIONS, but not in
# ALL_CONFIGURABLE_CERES_OPTIONS (which is an error).
list(REMOVE_ITEM CURRENT_CERES_COMPILE_OPTIONS ${CERES_OPTION})
else()
set(${CERES_OPTION} "// #define ${CERES_OPTION}")
endif()
endforeach()
# CURRENT_CERES_COMPILE_OPTIONS should now be an empty list, any elements
# remaining were not present in ALL_CONFIGURABLE_CERES_OPTIONS read from
# config.h.in.
if (CURRENT_CERES_COMPILE_OPTIONS)
message(FATAL_ERROR "Ceres Bug: CURRENT_CERES_COMPILE_OPTIONS contained "
"the following options which were not present in config.h.in: "
"${CURRENT_CERES_COMPILE_OPTIONS}")
endif()
configure_file(${CERES_CONFIG_IN_FILE}
"${CERES_CONFIG_OUTPUT_DIRECTORY}/config.h" @ONLY)
endfunction()