cmake_modules/CheckTypeSize.cmake
author Wuzzy <almikes@aol.com>
Fri, 06 May 2016 17:26:06 +0200
changeset 11814 8eccc307ca1e
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permissions -rw-r--r--
Frontend: Increase space for help text in the footer
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#.rst:
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# CheckTypeSize
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# -------------
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#
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# Check sizeof a type
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#
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# ::
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#
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#   CHECK_TYPE_SIZE(TYPE VARIABLE [BUILTIN_TYPES_ONLY]
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#                                 [LANGUAGE <language>])
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#
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# Check if the type exists and determine its size.  On return,
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# "HAVE_${VARIABLE}" holds the existence of the type, and "${VARIABLE}"
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# holds one of the following:
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#
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# ::
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#
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#    <size> = type has non-zero size <size>
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#    "0"    = type has arch-dependent size (see below)
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#    ""     = type does not exist
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#
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# Both ``HAVE_${VARIABLE}`` and ``${VARIABLE}`` will be created as internal
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# cache variables.
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#
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# Furthermore, the variable "${VARIABLE}_CODE" holds C preprocessor code
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# to define the macro "${VARIABLE}" to the size of the type, or leave
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# the macro undefined if the type does not exist.
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#
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# The variable "${VARIABLE}" may be "0" when CMAKE_OSX_ARCHITECTURES has
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# multiple architectures for building OS X universal binaries.  This
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# indicates that the type size varies across architectures.  In this
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# case "${VARIABLE}_CODE" contains C preprocessor tests mapping from
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# each architecture macro to the corresponding type size.  The list of
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# architecture macros is stored in "${VARIABLE}_KEYS", and the value for
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# each key is stored in "${VARIABLE}-${KEY}".
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#
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# If the BUILTIN_TYPES_ONLY option is not given, the macro checks for
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# headers <sys/types.h>, <stdint.h>, and <stddef.h>, and saves results
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# in HAVE_SYS_TYPES_H, HAVE_STDINT_H, and HAVE_STDDEF_H.  The type size
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# check automatically includes the available headers, thus supporting
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# checks of types defined in the headers.
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#
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# If LANGUAGE is set, the specified compiler will be used to perform the
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# check. Acceptable values are C and CXX
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#
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# Despite the name of the macro you may use it to check the size of more
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# complex expressions, too.  To check e.g.  for the size of a struct
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# member you can do something like this:
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#
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# ::
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#
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#   check_type_size("((struct something*)0)->member" SIZEOF_MEMBER)
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#
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#
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#
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# The following variables may be set before calling this macro to modify
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# the way the check is run:
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#
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# ::
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#
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#   CMAKE_REQUIRED_FLAGS = string of compile command line flags
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#   CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
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#   CMAKE_REQUIRED_INCLUDES = list of include directories
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#   CMAKE_REQUIRED_LIBRARIES = list of libraries to link
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#   CMAKE_REQUIRED_QUIET = execute quietly without messages
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#   CMAKE_EXTRA_INCLUDE_FILES = list of extra headers to include
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#=============================================================================
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# Copyright 2002-2009 Kitware, Inc.
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#
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# Distributed under the OSI-approved BSD License (the "License");
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# see accompanying file Copyright.txt for details.
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#
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# This software is distributed WITHOUT ANY WARRANTY; without even the
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# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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# See the License for more information.
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#=============================================================================
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# (To distribute this file outside of CMake, substitute the full
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#  License text for the above reference.)
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include(CheckIncludeFile)
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include(CheckIncludeFileCXX)
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cmake_policy(PUSH)
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cmake_policy(VERSION 3.0)
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get_filename_component(__check_type_size_dir "${CMAKE_CURRENT_LIST_FILE}" PATH)
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#-----------------------------------------------------------------------------
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# Helper function.  DO NOT CALL DIRECTLY.
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function(__check_type_size_impl type var map builtin language)
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  if(NOT CMAKE_REQUIRED_QUIET)
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    message(STATUS "Check size of ${type}")
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  endif()
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  # Include header files.
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  set(headers)
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  if(builtin)
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    if(HAVE_SYS_TYPES_H)
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      set(headers "${headers}#include <sys/types.h>\n")
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    endif()
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    if(HAVE_STDINT_H)
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      set(headers "${headers}#include <stdint.h>\n")
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    endif()
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    if(HAVE_STDDEF_H)
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      set(headers "${headers}#include <stddef.h>\n")
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    endif()
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  endif()
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  foreach(h ${CMAKE_EXTRA_INCLUDE_FILES})
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    set(headers "${headers}#include \"${h}\"\n")
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  endforeach()
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  # Perform the check.
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  if("${language}" STREQUAL "C")
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    set(src ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CheckTypeSize/${var}.c)
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  elseif("${language}" STREQUAL "CXX")
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    set(src ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CheckTypeSize/${var}.cpp)
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  else()
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    message(FATAL_ERROR "Unknown language:\n  ${language}\nSupported languages: C, CXX.\n")
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  endif()
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  set(bin ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CheckTypeSize/${var}.bin)
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  configure_file(${__check_type_size_dir}/CheckTypeSize.c.in ${src} @ONLY)
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  try_run(${var}_run_result HAVE_${var} ${CMAKE_BINARY_DIR} ${src}
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    COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
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    LINK_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES}
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    CMAKE_FLAGS
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      "-DCOMPILE_DEFINITIONS:STRING=${CMAKE_REQUIRED_FLAGS}"
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      "-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}"
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    RUN_OUTPUT_VARIABLE ${var}_run_output
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    COMPILE_OUTPUT_VARIABLE output
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    )
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  if(${HAVE_${var}} AND NOT "${${var}_run_result}" STREQUAL "FAILED_TO_RUN")
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    set(${var} ${${var}_run_result})
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    if(NOT CMAKE_REQUIRED_QUIET)
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      message(STATUS "Check size of ${type} - done")
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    endif()
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    file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
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      "Determining size of ${type} passed with the following output:\n${output}\n\n")
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    set(${var} "${${var}}" CACHE INTERNAL "CHECK_TYPE_SIZE: sizeof(${type})")
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  else()
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    # The check failed to compile.
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    if(NOT CMAKE_REQUIRED_QUIET)
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      message(STATUS "Check size of ${type} - failed")
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    endif()
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    file(READ ${src} content)
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    file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
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      "Determining size of ${type} failed with the following output:\n${output}\n${src}:\n${content}\n\n")
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    set(${var} "" CACHE INTERNAL "CHECK_TYPE_SIZE: ${type} unknown")
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    file(REMOVE ${map})
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  endif()
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endfunction()
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#-----------------------------------------------------------------------------
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macro(CHECK_TYPE_SIZE TYPE VARIABLE)
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  # parse arguments
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  unset(doing)
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  foreach(arg ${ARGN})
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    if("x${arg}" STREQUAL "xBUILTIN_TYPES_ONLY")
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      set(_CHECK_TYPE_SIZE_${arg} 1)
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      unset(doing)
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    elseif("x${arg}" STREQUAL "xLANGUAGE") # change to MATCHES for more keys
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      set(doing "${arg}")
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      set(_CHECK_TYPE_SIZE_${doing} "")
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    elseif("x${doing}" STREQUAL "xLANGUAGE")
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      set(_CHECK_TYPE_SIZE_${doing} "${arg}")
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      unset(doing)
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    else()
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      message(FATAL_ERROR "Unknown argument:\n  ${arg}\n")
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    endif()
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  endforeach()
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  if("x${doing}" MATCHES "^x(LANGUAGE)$")
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    message(FATAL_ERROR "Missing argument:\n  ${doing} arguments requires a value\n")
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  endif()
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  if(DEFINED _CHECK_TYPE_SIZE_LANGUAGE)
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    if(NOT "x${_CHECK_TYPE_SIZE_LANGUAGE}" MATCHES "^x(C|CXX)$")
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      message(FATAL_ERROR "Unknown language:\n  ${_CHECK_TYPE_SIZE_LANGUAGE}.\nSupported languages: C, CXX.\n")
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    endif()
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    set(_language ${_CHECK_TYPE_SIZE_LANGUAGE})
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  else()
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    set(_language C)
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  endif()
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  # Optionally check for standard headers.
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  if(_CHECK_TYPE_SIZE_BUILTIN_TYPES_ONLY)
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    set(_builtin 0)
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  else()
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    set(_builtin 1)
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    if("${_language}" STREQUAL "C")
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      check_include_file(sys/types.h HAVE_SYS_TYPES_H)
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      check_include_file(stdint.h HAVE_STDINT_H)
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      check_include_file(stddef.h HAVE_STDDEF_H)
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    elseif("${_language}" STREQUAL "CXX")
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      check_include_file_cxx(sys/types.h HAVE_SYS_TYPES_H)
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      check_include_file_cxx(stdint.h HAVE_STDINT_H)
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      check_include_file_cxx(stddef.h HAVE_STDDEF_H)
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    endif()
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  endif()
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  unset(_CHECK_TYPE_SIZE_BUILTIN_TYPES_ONLY)
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  unset(_CHECK_TYPE_SIZE_LANGUAGE)
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  # Compute or load the size or size map.
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  set(${VARIABLE}_KEYS)
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  set(_map_file ${CMAKE_BINARY_DIR}/${CMAKE_FILES_DIRECTORY}/CheckTypeSize/${VARIABLE}.cmake)
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  if(NOT DEFINED HAVE_${VARIABLE})
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    __check_type_size_impl(${TYPE} ${VARIABLE} ${_map_file} ${_builtin} ${_language})
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  endif()
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  include(${_map_file} OPTIONAL)
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  set(_map_file)
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  set(_builtin)
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  # Create preprocessor code.
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  if(${VARIABLE}_KEYS)
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    set(${VARIABLE}_CODE)
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    set(_if if)
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    foreach(key ${${VARIABLE}_KEYS})
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      set(${VARIABLE}_CODE "${${VARIABLE}_CODE}#${_if} defined(${key})\n# define ${VARIABLE} ${${VARIABLE}-${key}}\n")
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      set(_if elif)
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    endforeach()
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    set(${VARIABLE}_CODE "${${VARIABLE}_CODE}#else\n# error ${VARIABLE} unknown\n#endif")
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    set(_if)
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  elseif(${VARIABLE})
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    set(${VARIABLE}_CODE "#define ${VARIABLE} ${${VARIABLE}}")
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  else()
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    set(${VARIABLE}_CODE "/* #undef ${VARIABLE} */")
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  endif()
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endmacro()
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#-----------------------------------------------------------------------------
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cmake_policy(POP)