diff options
Diffstat (limited to 'Modules/CheckTypeSize.cmake')
| -rw-r--r-- | Modules/CheckTypeSize.cmake | 191 |
1 files changed, 128 insertions, 63 deletions
diff --git a/Modules/CheckTypeSize.cmake b/Modules/CheckTypeSize.cmake index 2d0eab51c..fcf1df740 100644 --- a/Modules/CheckTypeSize.cmake +++ b/Modules/CheckTypeSize.cmake @@ -1,89 +1,114 @@ -# - Check sizeof a type -# CHECK_TYPE_SIZE(TYPE VARIABLE [BUILTIN_TYPES_ONLY]) -# Check if the type exists and determine its size. -# On return, "HAVE_${VARIABLE}" holds the existence of the type, -# and "${VARIABLE}" holds one of the following: -# <size> = type has non-zero size <size> -# "0" = type has arch-dependent size (see below) -# "" = type does not exist -# Furthermore, the variable "${VARIABLE}_CODE" holds C preprocessor -# code to define the macro "${VARIABLE}" to the size of the type, or -# leave the macro undefined if the type does not exist. -# -# The variable "${VARIABLE}" may be "0" when CMAKE_OSX_ARCHITECTURES -# has multiple architectures for building OS X universal binaries. -# This indicates that the type size varies across architectures. -# In this case "${VARIABLE}_CODE" contains C preprocessor tests -# mapping from each architecture macro to the corresponding type size. -# The list of architecture macros is stored in "${VARIABLE}_KEYS", and -# the value for each key is stored in "${VARIABLE}-${KEY}". +# Distributed under the OSI-approved BSD 3-Clause License. See accompanying +# file Copyright.txt or https://cmake.org/licensing for details. + +#.rst: +# CheckTypeSize +# ------------- +# +# Check sizeof a type +# +# :: +# +# CHECK_TYPE_SIZE(TYPE VARIABLE [BUILTIN_TYPES_ONLY] +# [LANGUAGE <language>]) +# +# Check if the type exists and determine its size. On return, +# "HAVE_${VARIABLE}" holds the existence of the type, and "${VARIABLE}" +# holds one of the following: +# +# :: +# +# <size> = type has non-zero size <size> +# "0" = type has arch-dependent size (see below) +# "" = type does not exist +# +# Both ``HAVE_${VARIABLE}`` and ``${VARIABLE}`` will be created as internal +# cache variables. +# +# Furthermore, the variable "${VARIABLE}_CODE" holds C preprocessor code +# to define the macro "${VARIABLE}" to the size of the type, or leave +# the macro undefined if the type does not exist. +# +# The variable "${VARIABLE}" may be "0" when CMAKE_OSX_ARCHITECTURES has +# multiple architectures for building OS X universal binaries. This +# indicates that the type size varies across architectures. In this +# case "${VARIABLE}_CODE" contains C preprocessor tests mapping from +# each architecture macro to the corresponding type size. The list of +# architecture macros is stored in "${VARIABLE}_KEYS", and the value for +# each key is stored in "${VARIABLE}-${KEY}". # # If the BUILTIN_TYPES_ONLY option is not given, the macro checks for # headers <sys/types.h>, <stdint.h>, and <stddef.h>, and saves results -# in HAVE_SYS_TYPES_H, HAVE_STDINT_H, and HAVE_STDDEF_H. The type -# size check automatically includes the available headers, thus -# supporting checks of types defined in the headers. +# in HAVE_SYS_TYPES_H, HAVE_STDINT_H, and HAVE_STDDEF_H. The type size +# check automatically includes the available headers, thus supporting +# checks of types defined in the headers. # -# Despite the name of the macro you may use it to check the size of -# more complex expressions, too. To check e.g. for the size of a struct +# If LANGUAGE is set, the specified compiler will be used to perform the +# check. Acceptable values are C and CXX +# +# Despite the name of the macro you may use it to check the size of more +# complex expressions, too. To check e.g. for the size of a struct # member you can do something like this: -# check_type_size("((struct something*)0)->member" SIZEOF_MEMBER) # -# The following variables may be set before calling this macro to -# modify the way the check is run: +# :: # -# CMAKE_REQUIRED_FLAGS = string of compile command line flags -# CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar) -# CMAKE_REQUIRED_INCLUDES = list of include directories -# CMAKE_REQUIRED_LIBRARIES = list of libraries to link -# CMAKE_EXTRA_INCLUDE_FILES = list of extra headers to include - -#============================================================================= -# Copyright 2002-2009 Kitware, Inc. +# check_type_size("((struct something*)0)->member" SIZEOF_MEMBER) +# +# +# +# The following variables may be set before calling this macro to modify +# the way the check is run: # -# Distributed under the OSI-approved BSD License (the "License"); -# see accompanying file Copyright.txt for details. +# :: # -# This software is distributed WITHOUT ANY WARRANTY; without even the -# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. -# See the License for more information. -#============================================================================= -# (To distribute this file outside of CMake, substitute the full -# License text for the above reference.) +# CMAKE_REQUIRED_FLAGS = string of compile command line flags +# CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar) +# CMAKE_REQUIRED_INCLUDES = list of include directories +# CMAKE_REQUIRED_LIBRARIES = list of libraries to link +# CMAKE_REQUIRED_QUIET = execute quietly without messages +# CMAKE_EXTRA_INCLUDE_FILES = list of extra headers to include include(CheckIncludeFile) +include(CheckIncludeFileCXX) cmake_policy(PUSH) -cmake_minimum_required(VERSION 2.6 FATAL_ERROR) +cmake_policy(SET CMP0054 NEW) get_filename_component(__check_type_size_dir "${CMAKE_CURRENT_LIST_FILE}" PATH) #----------------------------------------------------------------------------- # Helper function. DO NOT CALL DIRECTLY. -function(__check_type_size_impl type var map builtin) - message(STATUS "Check size of ${type}") +function(__check_type_size_impl type var map builtin language) + if(NOT CMAKE_REQUIRED_QUIET) + message(STATUS "Check size of ${type}") + endif() # Include header files. set(headers) if(builtin) if(HAVE_SYS_TYPES_H) - set(headers "${headers}#include <sys/types.h>\n") + string(APPEND headers "#include <sys/types.h>\n") endif() if(HAVE_STDINT_H) - set(headers "${headers}#include <stdint.h>\n") + string(APPEND headers "#include <stdint.h>\n") endif() if(HAVE_STDDEF_H) - set(headers "${headers}#include <stddef.h>\n") + string(APPEND headers "#include <stddef.h>\n") endif() endif() foreach(h ${CMAKE_EXTRA_INCLUDE_FILES}) - set(headers "${headers}#include \"${h}\"\n") + string(APPEND headers "#include \"${h}\"\n") endforeach() # Perform the check. - - set(src ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CheckTypeSize/${var}.c) + if(language STREQUAL "C") + set(src ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CheckTypeSize/${var}.c) + elseif(language STREQUAL "CXX") + set(src ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CheckTypeSize/${var}.cpp) + else() + message(FATAL_ERROR "Unknown language:\n ${language}\nSupported languages: C, CXX.\n") + endif() set(bin ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CheckTypeSize/${var}.bin) configure_file(${__check_type_size_dir}/CheckTypeSize.c.in ${src} @ONLY) try_compile(HAVE_${var} ${CMAKE_BINARY_DIR} ${src} @@ -110,7 +135,7 @@ function(__check_type_size_impl type var map builtin) foreach(info ${strings}) if("${info}" MATCHES "${regex_size}") # Get the type size. - string(REGEX REPLACE "${regex_size}" "\\1" size "${info}") + set(size "${CMAKE_MATCH_1}") if(first) set(${var} ${size}) elseif(NOT "${size}" STREQUAL "${${var}}") @@ -122,7 +147,7 @@ function(__check_type_size_impl type var map builtin) string(REGEX MATCH "${regex_key}" key "${info}") string(REGEX REPLACE "${regex_key}" "\\1" key "${key}") if(key) - set(code "${code}\nset(${var}-${key} \"${size}\")") + string(APPEND code "\nset(${var}-${key} \"${size}\")") list(APPEND keys ${key}) endif() endif() @@ -140,13 +165,17 @@ function(__check_type_size_impl type var map builtin) message(SEND_ERROR "CHECK_TYPE_SIZE found different results, consider setting CMAKE_OSX_ARCHITECTURES or CMAKE_TRY_COMPILE_OSX_ARCHITECTURES to one or no architecture !") endif() - message(STATUS "Check size of ${type} - done") + if(NOT CMAKE_REQUIRED_QUIET) + message(STATUS "Check size of ${type} - done") + endif() file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log "Determining size of ${type} passed with the following output:\n${output}\n\n") set(${var} "${${var}}" CACHE INTERNAL "CHECK_TYPE_SIZE: sizeof(${type})") else() # The check failed to compile. - message(STATUS "Check size of ${type} - failed") + if(NOT CMAKE_REQUIRED_QUIET) + message(STATUS "Check size of ${type} - failed") + endif() file(READ ${src} content) file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log "Determining size of ${type} failed with the following output:\n${output}\n${src}:\n${content}\n\n") @@ -157,21 +186,57 @@ endfunction() #----------------------------------------------------------------------------- macro(CHECK_TYPE_SIZE TYPE VARIABLE) + # parse arguments + unset(doing) + foreach(arg ${ARGN}) + if("x${arg}" STREQUAL "xBUILTIN_TYPES_ONLY") + set(_CHECK_TYPE_SIZE_${arg} 1) + unset(doing) + elseif("x${arg}" STREQUAL "xLANGUAGE") # change to MATCHES for more keys + set(doing "${arg}") + set(_CHECK_TYPE_SIZE_${doing} "") + elseif("x${doing}" STREQUAL "xLANGUAGE") + set(_CHECK_TYPE_SIZE_${doing} "${arg}") + unset(doing) + else() + message(FATAL_ERROR "Unknown argument:\n ${arg}\n") + endif() + endforeach() + if("x${doing}" MATCHES "^x(LANGUAGE)$") + message(FATAL_ERROR "Missing argument:\n ${doing} arguments requires a value\n") + endif() + if(DEFINED _CHECK_TYPE_SIZE_LANGUAGE) + if(NOT "x${_CHECK_TYPE_SIZE_LANGUAGE}" MATCHES "^x(C|CXX)$") + message(FATAL_ERROR "Unknown language:\n ${_CHECK_TYPE_SIZE_LANGUAGE}.\nSupported languages: C, CXX.\n") + endif() + set(_language ${_CHECK_TYPE_SIZE_LANGUAGE}) + else() + set(_language C) + endif() + # Optionally check for standard headers. - if("${ARGV2}" STREQUAL "BUILTIN_TYPES_ONLY") + if(_CHECK_TYPE_SIZE_BUILTIN_TYPES_ONLY) set(_builtin 0) else() set(_builtin 1) - check_include_file(sys/types.h HAVE_SYS_TYPES_H) - check_include_file(stdint.h HAVE_STDINT_H) - check_include_file(stddef.h HAVE_STDDEF_H) + if(_language STREQUAL "C") + check_include_file(sys/types.h HAVE_SYS_TYPES_H) + check_include_file(stdint.h HAVE_STDINT_H) + check_include_file(stddef.h HAVE_STDDEF_H) + elseif(_language STREQUAL "CXX") + check_include_file_cxx(sys/types.h HAVE_SYS_TYPES_H) + check_include_file_cxx(stdint.h HAVE_STDINT_H) + check_include_file_cxx(stddef.h HAVE_STDDEF_H) + endif() endif() + unset(_CHECK_TYPE_SIZE_BUILTIN_TYPES_ONLY) + unset(_CHECK_TYPE_SIZE_LANGUAGE) # Compute or load the size or size map. set(${VARIABLE}_KEYS) set(_map_file ${CMAKE_BINARY_DIR}/${CMAKE_FILES_DIRECTORY}/CheckTypeSize/${VARIABLE}.cmake) if(NOT DEFINED HAVE_${VARIABLE}) - __check_type_size_impl(${TYPE} ${VARIABLE} ${_map_file} ${_builtin}) + __check_type_size_impl(${TYPE} ${VARIABLE} ${_map_file} ${_builtin} ${_language}) endif() include(${_map_file} OPTIONAL) set(_map_file) @@ -182,10 +247,10 @@ macro(CHECK_TYPE_SIZE TYPE VARIABLE) set(${VARIABLE}_CODE) set(_if if) foreach(key ${${VARIABLE}_KEYS}) - set(${VARIABLE}_CODE "${${VARIABLE}_CODE}#${_if} defined(${key})\n# define ${VARIABLE} ${${VARIABLE}-${key}}\n") + string(APPEND ${VARIABLE}_CODE "#${_if} defined(${key})\n# define ${VARIABLE} ${${VARIABLE}-${key}}\n") set(_if elif) endforeach() - set(${VARIABLE}_CODE "${${VARIABLE}_CODE}#else\n# error ${VARIABLE} unknown\n#endif") + string(APPEND ${VARIABLE}_CODE "#else\n# error ${VARIABLE} unknown\n#endif") set(_if) elseif(${VARIABLE}) set(${VARIABLE}_CODE "#define ${VARIABLE} ${${VARIABLE}}") |