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[cmake] Require C++17.

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Egor Pugin 2021-03-10 00:41:47 +03:00 committed by GitHub
parent 0f1296c6f6
commit 73a325494e
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1 changed files with 0 additions and 28 deletions
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CMakeLists.txt
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@ -112,35 +112,7 @@ endif()
include(CheckCXXCompilerFlag)
# Check for C++ standard to use
get_property(known_features GLOBAL PROPERTY CMAKE_CXX_KNOWN_FEATURES)
if (cxx_std_17 IN_LIST known_features)
set(CMAKE_CXX_STANDARD 17)
elseif (cxx_std_14 IN_LIST known_features)
set(CMAKE_CXX_STANDARD 14)
else() # minimum required standard
set(CMAKE_CXX_STANDARD 11)
endif()
if ("${CMAKE_CXX17_STANDARD_COMPILE_OPTION}" STREQUAL "")
set(CMAKE_CXX_STANDARD 14)
endif()
if ("${CMAKE_CXX14_STANDARD_COMPILE_OPTION}" STREQUAL "")
set(CMAKE_CXX_STANDARD 11)
endif()
# Avoid using experimental c++1y (c++1z) standard even if the compiler announces cxx14 (cxx17)
# in CMAKE_CXX_KNOWN_FEATURES and CMAKE_CXX_COMPILE_FEATURES
# It is the case of clang 3.9, 4.0 (announces c++1z) and gcc 4.8 (announces c++1y)
if ("${CMAKE_CXX17_STANDARD_COMPILE_OPTION}" STREQUAL "-std=c++1z")
set(CMAKE_CXX_STANDARD 14)
endif()
if ("${CMAKE_CXX14_STANDARD_COMPILE_OPTION}" STREQUAL "-std=c++1y")
set(CMAKE_CXX_STANDARD 11)
endif()
# temporarily
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)