cmake_modules/CheckTypeSize.cmake
author Wuzzy <Wuzzy2@mail.ru>
Mon, 13 Nov 2017 22:14:45 +0100
changeset 12841 8610462e3d33
parent 11663 f87ed83568c8
permissions -rw-r--r--
Remove 2 unused number tags in Construction Mode GUI These numbers are shown aside the power tag, but the numbers never change. They don't serve any purpose and are just visual clutter and annoying, since they partially overlap. They are probably a leftover from copying code over from other scripts. With this changeset, only the power and turn time are left visible, as it is supposed to.
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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)