# CheckStructHasMember

Check if the given struct or class has the specified member variable

`CHECK_STRUCT_HAS_MEMBER`

      CHECK_STRUCT_HAS_MEMBER(<struct> <member> <header> <variable>
                              [LANGUAGE <language>])

      <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
      <language> - the compiler to use (C or CXX)

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_LINK_OPTIONS`

  New in version 3.14: list of options to pass to link command.

`CMAKE_REQUIRED_LIBRARIES`

  list of libraries to link.

`CMAKE_REQUIRED_QUIET`

  New in version 3.1: execute quietly without messages.

Example:

    CHECK_STRUCT_HAS_MEMBER("struct timeval" tv_sec sys/select.h
                            HAVE_TIMEVAL_TV_SEC LANGUAGE C)