cmake/DetermineWordSize.cmake

# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
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function(DETERMINE_WORD_SIZE word_size)

# Check if 64-bit
  try_compile(COMPILE_SUCCESS "${CMAKE_CURRENT_BINARY_DIR}"
    "${CMAKE_CURRENT_SOURCE_DIR}/cmake/determine_word_size/check_64.c")

  if(COMPILE_SUCCESS)
    set(${word_size} 64 PARENT_SCOPE)
    return()
  endif()

# Check if 32-bit
  try_compile(COMPILE_SUCCESS "${CMAKE_CURRENT_BINARY_DIR}"
    "${CMAKE_CURRENT_SOURCE_DIR}/cmake/determine_word_size/check_32.c")

  if(COMPILE_SUCCESS)
    set(${word_size} 32 PARENT_SCOPE)
    return()
  endif()

# Check if 16-bit
  try_compile(COMPILE_SUCCESS "${CMAKE_CURRENT_BINARY_DIR}"
    "${CMAKE_CURRENT_SOURCE_DIR}/cmake/determine_word_size/check_16.c")

  if(COMPILE_SUCCESS)
    set(${word_size} 16 PARENT_SCOPE)
    return()
  endif()

endfunction()