include(Compiler/GNU)
__compiler_gnu(CXX)

set(CMAKE_CXX_COMPILE_OPTIONS_EXPLICIT_LANGUAGE -x c++)

if (WIN32)
  if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.6)
    set(CMAKE_CXX_COMPILE_OPTIONS_VISIBILITY_INLINES_HIDDEN "-fno-keep-inline-dllexport")
  endif()
else()
  if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.0)
    set(CMAKE_CXX_COMPILE_OPTIONS_VISIBILITY_INLINES_HIDDEN "-fvisibility-inlines-hidden")
  endif()
endif()

if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.4)
  set(CMAKE_CXX98_STANDARD_COMPILE_OPTION "-std=c++98")
  set(CMAKE_CXX98_EXTENSION_COMPILE_OPTION "-std=gnu++98")
endif()

if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.7)
  set(CMAKE_CXX98_STANDARD__HAS_FULL_SUPPORT ON)
  set(CMAKE_CXX11_STANDARD_COMPILE_OPTION "-std=c++11")
  set(CMAKE_CXX11_EXTENSION_COMPILE_OPTION "-std=gnu++11")
elseif (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.4)
  # 4.3 supports 0x variants
  set(CMAKE_CXX11_STANDARD_COMPILE_OPTION "-std=c++0x")
  set(CMAKE_CXX11_EXTENSION_COMPILE_OPTION "-std=gnu++0x")
endif()

if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.8.1)
  set(CMAKE_CXX11_STANDARD__HAS_FULL_SUPPORT ON)
endif()

if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.9)
  set(CMAKE_CXX14_STANDARD_COMPILE_OPTION "-std=c++14")
  set(CMAKE_CXX14_EXTENSION_COMPILE_OPTION "-std=gnu++14")
elseif (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.8)
  set(CMAKE_CXX14_STANDARD_COMPILE_OPTION "-std=c++1y")
  set(CMAKE_CXX14_EXTENSION_COMPILE_OPTION "-std=gnu++1y")
endif()

if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.0)
  set(CMAKE_CXX14_STANDARD__HAS_FULL_SUPPORT ON)
endif()

if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 8.0)
  set(CMAKE_CXX17_STANDARD_COMPILE_OPTION "-std=c++17")
  set(CMAKE_CXX17_EXTENSION_COMPILE_OPTION "-std=gnu++17")
elseif (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.1)
  set(CMAKE_CXX17_STANDARD_COMPILE_OPTION "-std=c++1z")
  set(CMAKE_CXX17_EXTENSION_COMPILE_OPTION "-std=gnu++1z")
endif()

if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 8.0)
  set(CMAKE_CXX20_STANDARD_COMPILE_OPTION "-std=c++2a")
  set(CMAKE_CXX20_EXTENSION_COMPILE_OPTION "-std=gnu++2a")
endif()

__compiler_check_default_language_standard(CXX 3.4 98 6.0 14)