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