diff options
Diffstat (limited to 'Modules/CheckTypeSize.cmake')
-rw-r--r-- | Modules/CheckTypeSize.cmake | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/Modules/CheckTypeSize.cmake b/Modules/CheckTypeSize.cmake new file mode 100644 index 000000000..1717718c9 --- /dev/null +++ b/Modules/CheckTypeSize.cmake @@ -0,0 +1,196 @@ +# - 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}-${KEY}". +# +# If the BUILTIN_TYPES_ONLY option is not given, the macro checks for +# headers <sys/types.h>, <stdint.h>, and <stddef.h>, and saves results +# in HAVE_SYS_TYPES_H, HAVE_STDINT_H, and HAVE_STDDEF_H. The type +# size check automatically includes the available headers, thus +# supporting checks of types defined in the headers. +# +# The following variables may be set before calling this macro to +# modify the way the check is run: +# +# CMAKE_REQUIRED_FLAGS = string of compile command line flags +# CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar) +# CMAKE_REQUIRED_INCLUDES = list of include directories +# CMAKE_REQUIRED_LIBRARIES = list of libraries to link +# CMAKE_EXTRA_INCLUDE_FILES = list of extra headers to include + +#============================================================================= +# Copyright 2002-2009 Kitware, Inc. +# +# Distributed under the OSI-approved BSD License (the "License"); +# see accompanying file Copyright.txt for details. +# +# This software is distributed WITHOUT ANY WARRANTY; without even the +# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. +# See the License for more information. +#============================================================================= +# (To distribute this file outside of CMake, substitute the full +# License text for the above reference.) + +include(CheckIncludeFile) +include("${CMAKE_CURRENT_LIST_DIR}/CMakeExpandImportedTargets.cmake") + +cmake_policy(PUSH) +cmake_minimum_required(VERSION 2.6 FATAL_ERROR) + +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 ${type}") + + # Include header files. + set(headers) + if(builtin) + if(HAVE_SYS_TYPES_H) + set(headers "${headers}#include <sys/types.h>\n") + endif() + if(HAVE_STDINT_H) + set(headers "${headers}#include <stdint.h>\n") + endif() + if(HAVE_STDDEF_H) + set(headers "${headers}#include <stddef.h>\n") + endif() + endif() + foreach(h ${CMAKE_EXTRA_INCLUDE_FILES}) + set(headers "${headers}#include \"${h}\"\n") + endforeach() + + # Perform the check. + + # this one translates potentially used imported library targets to their files on disk + cmake_expand_imported_targets(_ADJUSTED_CMAKE_REQUIRED_LIBRARIES LIBRARIES ${CMAKE_REQUIRED_LIBRARIES} CONFIGURATION "${CMAKE_TRY_COMPILE_CONFIGURATION}") + + set(src ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CheckTypeSize/${var}.c) + 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} + COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} + CMAKE_FLAGS + "-DCOMPILE_DEFINITIONS:STRING=${CMAKE_REQUIRED_FLAGS}" + "-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}" + "-DLINK_LIBRARIES:STRING=${_ADJUSTED_CMAKE_REQUIRED_LIBRARIES}" + OUTPUT_VARIABLE output + COPY_FILE ${bin} + ) + + if(HAVE_${var}) + # The check compiled. Load information from the binary. + file(STRINGS ${bin} strings LIMIT_COUNT 10 REGEX "INFO:size") + + # Parse the information strings. + set(regex_size ".*INFO:size\\[0*([^]]*)\\].*") + set(regex_key " key\\[([^]]*)\\]") + set(keys) + set(code) + set(mismatch) + set(first 1) + foreach(info ${strings}) + if("${info}" MATCHES "${regex_size}") + # Get the type size. + string(REGEX REPLACE "${regex_size}" "\\1" size "${info}") + if(first) + set(${var} ${size}) + elseif(NOT "${size}" STREQUAL "${${var}}") + set(mismatch 1) + endif() + set(first 0) + + # Get the architecture map key. + string(REGEX MATCH "${regex_key}" key "${info}") + string(REGEX REPLACE "${regex_key}" "\\1" key "${key}") + if(key) + set(code "${code}\nset(${var}-${key} \"${size}\")") + list(APPEND keys ${key}) + endif() + endif() + endforeach() + + # Update the architecture-to-size map. + if(mismatch AND keys) + configure_file(${__check_type_size_dir}/CheckTypeSizeMap.cmake.in ${map} @ONLY) + set(${var} 0) + else() + file(REMOVE ${map}) + endif() + + if(mismatch AND NOT keys) + 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") + 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(HAVE_${var}) + # The check failed to compile. + message(STATUS "Check size of ${type} - failed") + 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") + set(${var} "" CACHE INTERNAL "CHECK_TYPE_SIZE: ${type} unknown") + file(REMOVE ${map}) + endif(HAVE_${var}) +endfunction() + +#----------------------------------------------------------------------------- +macro(CHECK_TYPE_SIZE TYPE VARIABLE) + # Optionally check for standard headers. + if("${ARGV2}" STREQUAL "BUILTIN_TYPES_ONLY") + set(_builtin 0) + else() + set(_builtin 1) + check_include_file(sys/types.h HAVE_SYS_TYPES_H) + check_include_file(stdint.h HAVE_STDINT_H) + check_include_file(stddef.h HAVE_STDDEF_H) + endif() + + # Compute or load the size or size map. + set(${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} ${_builtin}) + endif() + include(${_map_file} OPTIONAL) + set(_map_file) + set(_builtin) + + # Create preprocessor code. + if(${VARIABLE}_KEYS) + set(${VARIABLE}_CODE) + set(_if if) + foreach(key ${${VARIABLE}_KEYS}) + set(${VARIABLE}_CODE "${${VARIABLE}_CODE}#${_if} defined(${key})\n# define ${VARIABLE} ${${VARIABLE}-${key}}\n") + set(_if elif) + endforeach() + set(${VARIABLE}_CODE "${${VARIABLE}_CODE}#else\n# error ${VARIABLE} unknown\n#endif") + set(_if) + elseif(${VARIABLE}) + set(${VARIABLE}_CODE "#define ${VARIABLE} ${${VARIABLE}}") + else() + set(${VARIABLE}_CODE "/* #undef ${VARIABLE} */") + endif() +endmacro() + +#----------------------------------------------------------------------------- +cmake_policy(POP) |