Squashed 'third_party/ceres/' content from commit e51e9b4
Change-Id: I763587619d57e594d3fa158dc3a7fe0b89a1743b
git-subtree-dir: third_party/ceres
git-subtree-split: e51e9b46f6ca88ab8b2266d0e362771db6d98067
diff --git a/cmake/CreateCeresConfig.cmake b/cmake/CreateCeresConfig.cmake
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+# 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
+# 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()