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Raise cmake minimum required version to 3.8...3.17
CMake version `< 3.5` is no longer supported, so the new CMake minimum policy version is set to `3.8` to support C++17 unconditionally. After checking all the policies that might affect Icinga 2 in any way, CMake `3.17` is used as a max supported CMake policy. Anything above that may work but we didn't explicitly verify the policies introduced with CMake 3.18 and later and may or may not affect Icinga 2.
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@ -1,17 +1,12 @@
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# Icinga 2 | (c) 2012 Icinga GmbH | GPLv2+
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cmake_minimum_required(VERSION 2.8.12)
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# CMake 3.8 is required, CMake policy compatibility was verified up to 3.17.
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cmake_minimum_required(VERSION 3.8...3.17)
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set(BOOST_MIN_VERSION "1.66.0")
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if("${CMAKE_VERSION}" VERSION_LESS "3.8") # SLES 12.5
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if(NOT MSVC)
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17")
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endif()
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else()
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set(CMAKE_CXX_STANDARD 17)
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set(CMAKE_CXX_STANDARD_REQUIRED ON)
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set(CMAKE_CXX_EXTENSIONS OFF)
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endif()
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set(CMAKE_CXX_STANDARD 17)
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set(CMAKE_CXX_STANDARD_REQUIRED ON)
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set(CMAKE_CXX_EXTENSIONS OFF)
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project(icinga2)
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list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
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