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85 lines
4.4 KiB
85 lines
4.4 KiB
# Ceres Solver - A fast non-linear least squares minimizer
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# Copyright 2017 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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# Adds Ceres' C++11 requirements to a target such that they are exported when
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# the target is exported (if the version of CMake supports it).
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#
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# add_ceres_cxx11_requirements_to_target( [target1 [target2 [...]]] )
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function(add_ceres_cxx11_requirements_to_target)
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include(CheckCXXCompilerFlag)
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check_cxx_compiler_flag("-std=c++11" COMPILER_HAS_CXX11_FLAG)
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foreach(TARGET ${ARGN})
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if (NOT TARGET ${TARGET})
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message(FATAL_ERROR "Specified target to append Ceres C++11 requirements "
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"to: ${TARGET} is not a declared CMake target.")
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endif()
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if (COMPILER_HAS_CXX11_FLAG)
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# IMPORTANT: It is not sufficient to specify the
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# CXX_STANDARD/CXX_STANDARD_REQUIRED target properties
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# as these target properties are NOT exported.
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if (CMAKE_VERSION VERSION_LESS "2.8.12")
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# CMake version < 2.8.12 does not support target_compile_options(), warn
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# user that they will have to add compile flags to their own projects
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# manually.
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message(WARNING "-- Warning: Detected CMake version: ${CMAKE_VERSION} "
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"< 2.8.12, which is the minimum required for compile options to be "
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"included in an exported CMake target and the detected. compiler "
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"requires -std=c++11. The client is responsible for adding "
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"-std=c++11 when linking against: ${TARGET}.")
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elseif (COMMAND target_compile_features)
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# CMake >= 3.1, use new target_compile_features() to specify Ceres'
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# C++11 requirements as used in the public API. This assumes that
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# C++11 STL features are available if the specified features are
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# available. We do not use the cxx_std_11 feature to specify this as
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# this did not come in until CMake 3.8.
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#
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# The reason to prefer using target_compile_features() if it exists is
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# that this handles 'upgrading' of the C++ standard required more
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# gracefully, e.g. if a client of Ceres requires C++14, but Ceres was
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# compiled against C++11 then target_compile_options() may not work as
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# expected.
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target_compile_features(
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${TARGET} PUBLIC cxx_alignas cxx_alignof cxx_constexpr)
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else()
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# CMake version >= 2.8.12 && < 3.1 supports target_compile_options()
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# but not target_compile_features(). For these intermediary versions,
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# we use target_compile_options() to manually specify the C++11 flag and
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# export it for client targets that depend on the target iff they are
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# NOT compiling for C. We check for not C, rather than C++ as
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# LINKER_LANGUAGE is often NOTFOUND and then uses the default (C++).
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target_compile_options(${TARGET} PUBLIC
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$<$<NOT:$<STREQUAL:$<TARGET_PROPERTY:LINKER_LANGUAGE>,C>>:-std=c++11>)
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endif()
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endif()
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endforeach()
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endfunction()
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