1# - Check if the given struct or class has the specified member variable
2# CHECK_STRUCT_MEMBER (STRUCT MEMBER HEADER VARIABLE)
3#
4#  STRUCT - the name of the struct or class you are interested in
5#  MEMBER - the member which existence you want to check
6#  HEADER - the header(s) where the prototype should be declared
7#  VARIABLE - variable to store the result
8#
9# The following variables may be set before calling this macro to
10# modify the way the check is run:
11#
12#  CMAKE_REQUIRED_FLAGS = string of compile command line flags
13#  CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
14#  CMAKE_REQUIRED_INCLUDES = list of include directories
15
16INCLUDE(CheckCXXSourceCompiles)
17
18MACRO (CHECK_STRUCT_MEMBER _STRUCT _MEMBER _HEADER _RESULT)
19   SET(_INCLUDE_FILES)
20   FOREACH (it ${_HEADER})
21      SET(_INCLUDE_FILES "${_INCLUDE_FILES}#include <${it}>\n")
22   ENDFOREACH (it)
23
24   SET(_CHECK_STRUCT_MEMBER_SOURCE_CODE "
25${_INCLUDE_FILES}
26int main()
27{
28   ${_STRUCT}* tmp;
29   tmp->${_MEMBER};
30  return 0;
31}
32")
33   CHECK_CXX_SOURCE_COMPILES("${_CHECK_STRUCT_MEMBER_SOURCE_CODE}" ${_RESULT})
34
35ENDMACRO (CHECK_STRUCT_MEMBER)
36
37