include(Compiler/XL)
__compiler_xl(CXX)
string(APPEND CMAKE_CXX_FLAGS_RELEASE_INIT " -DNDEBUG")
string(APPEND CMAKE_CXX_FLAGS_MINSIZEREL_INIT " -DNDEBUG")

# -qthreaded = Ensures that all optimizations will be thread-safe
string(APPEND CMAKE_CXX_FLAGS_INIT " -qthreaded")

set(CMAKE_CXX_COMPILE_OPTIONS_EXPLICIT_LANGUAGE -+)

if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 10.1)
  if(CMAKE_SYSTEM MATCHES "Linux")
    set(CMAKE_CXX98_STANDARD_COMPILE_OPTION "")
    set(CMAKE_CXX98_EXTENSION_COMPILE_OPTION "")
  else()
    set(CMAKE_CXX98_STANDARD_COMPILE_OPTION "-qlanglvl=strict98")
    set(CMAKE_CXX98_EXTENSION_COMPILE_OPTION "-qlanglvl=extended")
  endif()
  set(CMAKE_CXX11_STANDARD_COMPILE_OPTION "-qlanglvl=extended0x")
  set(CMAKE_CXX11_EXTENSION_COMPILE_OPTION "-qlanglvl=extended0x")
  set(CMAKE_CXX98_STANDARD__HAS_FULL_SUPPORT ON)

  # XL does not really have full C++11 or C++14 support, but since we do not
  # have a granular XL-CXX-FeatureTests table for it just pretend it does.
  # This way projects that specify granular features will at least get a
  # compiler mode for the corresponding standard.
  set(CMAKE_CXX11_STANDARD__HAS_FULL_SUPPORT ON)

  if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 16.1.0 AND CMAKE_SYSTEM_NAME STREQUAL "Linux")
    set(CMAKE_CXX14_STANDARD_COMPILE_OPTION "-qlanglvl=extended1y")
    set(CMAKE_CXX14_EXTENSION_COMPILE_OPTION "-qlanglvl=extended1y")
    set(CMAKE_CXX14_STANDARD__HAS_FULL_SUPPORT ON)
  endif()
endif ()

__compiler_check_default_language_standard(CXX 10.1 98)