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dnl #
dnl # Look for a header file in a number of places.
dnl #
dnl # Usage: FR_CHECK_STRUCT_HAS_MEMBER([#include <foo.h>], [struct foo], member)
dnl # If the member is defined, then the variable
dnl # ac_cv_type_struct_foo_has_member is set to 'yes'
dnl #
AC_DEFUN([FR_CHECK_STRUCT_HAS_MEMBER], [
AC_MSG_CHECKING([for $3 in $2])
dnl BASED on 'offsetof':
dnl #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
dnl
AC_TRY_COMPILE([
$1
#ifdef HAVE_STDDEF_H
#include <stddef.h>
#endif
#ifndef offsetof
#define offsetof(TYPE, MEMBER) ((int) &((TYPE *)0)->MEMBER)
#endif
],
[ int foo = offsetof($2, $3) ],
has_element=" ",
has_element=)
ac_safe_type=`echo "$2" | sed 'y% %_%'`
if test "x$has_element" != "x"; then
AC_MSG_RESULT(yes)
eval "ac_cv_type_${ac_safe_type}_has_$3=yes"
else
AC_MSG_RESULT(no)
eval "ac_cv_type_${ac_safe_type}_has_$3="
fi
])
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