ceph/src/seastar/cmake/FindConcepts.cmake

   1 #
   2 # This file is open source software, licensed to you under the terms
   3 # of the Apache License, Version 2.0 (the "License").  See the NOTICE file
   4 # distributed with this work for additional information regarding copyright
   5 # ownership.  You may not use this file except in compliance with the License.
   6 #
   7 # You may obtain a copy of the License at
   8 #
   9 #   http://www.apache.org/licenses/LICENSE-2.0
  10 #
  11 # Unless required by applicable law or agreed to in writing,
  12 # software distributed under the License is distributed on an
  13 # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  14 # KIND, either express or implied.  See the License for the
  15 # specific language governing permissions and limitations
  16 # under the License.
  17 #
  18
  19 #
  20 # Copyright (C) 2018 Scylladb, Ltd.
  21 #
  22
  23 include (CheckCXXSourceCompiles)
  24 file (READ ${CMAKE_CURRENT_LIST_DIR}/code_tests/Concepts_test.cc _concepts_test_code)
  25 set (CMAKE_REQUIRED_FLAGS -fconcepts)
  26 check_cxx_source_compiles ("${_concepts_test_code}" Concepts_FOUND)
  27 set (CMAKE_REQUIRED_FLAGS "")
  28
  29 if (Concepts_FOUND AND NOT (TARGET Concepts::concepts))
  30   set (CMAKE_REQUIRED_FLAGS -fconcepts)
  31   add_library (Concepts::concepts INTERFACE IMPORTED)
  32
  33   set_target_properties (Concepts::concepts
  34     PROPERTIES
  35       INTERFACE_COMPILE_OPTIONS $<$<COMPILE_LANGUAGE:CXX>:-fconcepts>)
  36 endif ()