Revision c36622a45f55b296d0891d94a91372c320768be0 authored by David Cole on 31 October 2012, 14:59:55 UTC, committed by David Cole on 31 October 2012, 14:59:55 UTC
1 parent a774214
CheckTypeSize.cmake
# - 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}-${KEY}".
#
# If the BUILTIN_TYPES_ONLY option is not given, the macro checks for
# headers <sys/types.h>, <stdint.h>, and <stddef.h>, and saves results
# in HAVE_SYS_TYPES_H, HAVE_STDINT_H, and HAVE_STDDEF_H. The type
# size check automatically includes the available headers, thus
# supporting checks of types defined in the headers.
#
# Despite the name of the macro you may use it to check the size of
# more complex expressions, too. To check e.g. for the size of a struct
# member you can do something like this:
# check_type_size("((struct something*)0)->member" SIZEOF_MEMBER)
#
# The following variables may be set before calling this macro to
# modify the way the check is run:
#
# CMAKE_REQUIRED_FLAGS = string of compile command line flags
# CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
# CMAKE_REQUIRED_INCLUDES = list of include directories
# CMAKE_REQUIRED_LIBRARIES = list of libraries to link
# CMAKE_EXTRA_INCLUDE_FILES = list of extra headers to include
#=============================================================================
# Copyright 2002-2009 Kitware, Inc.
#
# Distributed under the OSI-approved BSD License (the "License");
# see accompanying file Copyright.txt for details.
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
#=============================================================================
# (To distribute this file outside of CMake, substitute the full
# License text for the above reference.)
include(CheckIncludeFile)
include("${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()
# 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 ${map})
endif()
endfunction()
#-----------------------------------------------------------------------------
macro(CHECK_TYPE_SIZE TYPE VARIABLE)
# Optionally check for standard headers.
if("${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)
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