Add ASan build type to CMake

# Set default build type and also populate a list of available options

get_property(is_multi_config GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)

if (NOT is_multi_config)

if (is_multi_config)

  if(NOT "ASan" IN_LIST CMAKE_CONFIGURATION_TYPES)

    list(APPEND CMAKE_CONFIGURATION_TYPES ASan)

  endif()

elseif (NOT is_multi_config)

  set(default_build_type "Release")

  set(allowed_build_types Debug Release MinSizeRel RelWithDebInfo)

  set(allowed_build_types ASan Debug Release MinSizeRel RelWithDebInfo)

  set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS "${allowed_build_types}")

      CACHE STRING "Choose the type of build." FORCE

      )

  elseif (NOT CMAKE_BUILD_TYPE IN_LIST allowed_build_types)

    message(FATAL_ERROR "Unknown build type: ${CMAKE_BUILD_TYPE}")

    message(WARNING "Unknown build type '${CMAKE_BUILD_TYPE}'. "

      "Defaulting to '${default_build_type}'")

    set(CMAKE_BUILD_TYPE "${default_build_type}"

      CACHE STRING "Choose the type of build." FORCE

      )

  endif ()

endif ()

# define the desired flags for the ASan build type

set(CMAKE_C_FLAGS_ASAN

    "${CMAKE_C_FLAGS_DEBUG} -fsanitize=address -fno-omit-frame-pointer" CACHE STRING

    "Flags used by the C compiler for ASan build type or configuration." FORCE)

set(CMAKE_CXX_FLAGS_ASAN

    "${CMAKE_CXX_FLAGS_DEBUG} -fsanitize=address -fno-omit-frame-pointer" CACHE STRING

    "Flags used by the C++ compiler for ASan build type or configuration." FORCE)

set(CMAKE_EXE_LINKER_FLAGS_ASAN

    "${CMAKE_SHARED_LINKER_FLAGS_DEBUG} -fsanitize=address" CACHE STRING

    "Linker flags to be used to create executables for ASan build type." FORCE)

set(CMAKE_SHARED_LINKER_FLAGS_ASAN

    "${CMAKE_SHARED_LINKER_FLAGS_DEBUG} -fsanitize=address" CACHE STRING

    "Linker lags to be used to create shared libraries for ASan build type." FORCE)

# make sure that debug versions for targets are used (if provided) in Debug mode

set_property(GLOBAL APPEND PROPERTY DEBUG_CONFIGURATIONS Debug)