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View File Name : CheckStructHasMember.cmake

# - Check if the given struct or class has the specified member variable
# CHECK_STRUCT_HAS_MEMBER (STRUCT MEMBER HEADER VARIABLE)
#
#  STRUCT - the name of the struct or class you are interested in
#  MEMBER - the member which existence you want to check
#  HEADER - the header(s) where the prototype should be declared
#  VARIABLE - variable to store the result
#
# 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
#
# Example: CHECK_STRUCT_HAS_MEMBER("struct timeval" tv_sec sys/select.h HAVE_TIMEVAL_TV_SEC)

#=============================================================================
# Copyright 2007-2009 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(CheckCSourceCompiles)

macro (CHECK_STRUCT_HAS_MEMBER _STRUCT _MEMBER _HEADER _RESULT)
   set(_INCLUDE_FILES)
   foreach (it ${_HEADER})
      set(_INCLUDE_FILES "${_INCLUDE_FILES}#include <${it}>\n")
   endforeach ()

   set(_CHECK_STRUCT_MEMBER_SOURCE_CODE "
${_INCLUDE_FILES}
int main()
{
   ${_STRUCT}* tmp;
   tmp->${_MEMBER};
  return 0;
}
")
   CHECK_C_SOURCE_COMPILES("${_CHECK_STRUCT_MEMBER_SOURCE_CODE}" ${_RESULT})

endmacro ()