hunter_check_toolchain_definition

This module can help users to get access to the C++ definitions in toolchain.info file (which is used for toolchain-id calculation).

For example if you need to check that current Windows toolchain has 64-bit architecture:

# cmake/project/Foo/hunter.cmake

include(hunter_check_toolchain_definition)

if(WIN32)
  # Windows platform

  # Check 64-bit or 32-bit
  hunter_check_toolchain_definition(
      NAME _WIN64 DEFINED _defined
  )

  if(_defined)
    # 64-bit
    hunter_add_version(...)
  else()
    # 32-bit
    hunter_add_version(...)
  endif()
endif()

Value of definition can be checked too:

# cmake/project/Foo/hunter.cmake

include(hunter_check_toolchain_definition)

if(WIN32)
  hunter_check_toolchain_definition(
      NAME "_WIN32_WINNT"
      DEFINED _defined
      VALUE _value
  )

  # check '_defined'

  if("${_value}" STREQUAL "0x0603")
    # Windows 8.1
  endif()
endif()