CMake/CheckTypeSize.cmake

   1 # - Check sizeof a type
   2 #  CHECK_TYPE_SIZE(TYPE VARIABLE)
   3 # Check if the type exists and determine size of type.  if the type
   4 # exists, the size will be stored to the variable.
   5 #
   6 #  VARIABLE - variable to store size if the type exists.
   7 #  HAVE_${VARIABLE} - does the variable exists or not
   8
   9 macro(CHECK_TYPE_SIZE TYPE VARIABLE)
  10   set(CMAKE_ALLOW_UNKNOWN_VARIABLE_READ_ACCESS 1)
  11   if(NOT DEFINED ${VARIABLE})
  12     if("HAVE_${VARIABLE}" MATCHES "^HAVE_${VARIABLE}$")
  13       set(CHECK_TYPE_SIZE_TYPE "${TYPE}")
  14       set(MACRO_CHECK_TYPE_SIZE_FLAGS
  15         "${CMAKE_REQUIRED_FLAGS}")
  16       foreach(def HAVE_SYS_TYPES_H
  17          HAVE_STDINT_H HAVE_STDDEF_H HAVE_SYS_SOCKET_H)
  18         if("${def}")
  19           set(MACRO_CHECK_TYPE_SIZE_FLAGS
  20             "${MACRO_CHECK_TYPE_SIZE_FLAGS} -D${def}")
  21         endif("${def}")
  22       endforeach(def)
  23       set(CHECK_TYPE_SIZE_PREMAIN)
  24       foreach(def ${CMAKE_EXTRA_INCLUDE_FILES})
  25         set(CHECK_TYPE_SIZE_PREMAIN "${CHECK_TYPE_SIZE_PREMAIN}#include \"${def}\"\n")
  26       endforeach(def)
  27       configure_file(
  28         "${CMAKE_CURRENT_SOURCE_DIR}/CMake/CheckTypeSize.c.in"
  29         "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckTypeSize.c"
  30         IMMEDIATE @ONLY)
  31       file(READ
  32         "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckTypeSize.c"
  33         CHECK_TYPE_SIZE_FILE_CONTENT)
  34       message(STATUS "Check size of ${TYPE}")
  35       if(CMAKE_REQUIRED_LIBRARIES)
  36         set(CHECK_TYPE_SIZE_ADD_LIBRARIES
  37           "-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES}")
  38       endif(CMAKE_REQUIRED_LIBRARIES)
  39       try_run(${VARIABLE} HAVE_${VARIABLE}
  40         ${CMAKE_BINARY_DIR}
  41         "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckTypeSize.c"
  42         CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_TYPE_SIZE_FLAGS}
  43         "${CHECK_TYPE_SIZE_ADD_LIBRARIES}"
  44         OUTPUT_VARIABLE OUTPUT)
  45       if(HAVE_${VARIABLE})
  46         message(STATUS "Check size of ${TYPE} - done")
  47         file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
  48           "Determining size of ${TYPE} passed with the following output:\n${OUTPUT}\n\n")
  49       else(HAVE_${VARIABLE})
  50         message(STATUS "Check size of ${TYPE} - failed")
  51         file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
  52           "Determining size of ${TYPE} failed with the following output:\n${OUTPUT}\nCheckTypeSize.c:\n${CHECK_TYPE_SIZE_FILE_CONTENT}\n\n")
  53       endif(HAVE_${VARIABLE})
  54     endif("HAVE_${VARIABLE}" MATCHES "^HAVE_${VARIABLE}$")
  55   endif(NOT DEFINED ${VARIABLE})
  56   set(CMAKE_ALLOW_UNKNOWN_VARIABLE_READ_ACCESS )
  57 endmacro(CHECK_TYPE_SIZE)