How to GTYize a struct properly?

["Laurynas Biveinis" <laurynas dot biveinis at gmail dot com>]

Hi,

For typed GC allocation I've to add GTY markers for a few datatypes.
An example from value-prof.h:

Before:

struct histogram_value_t
{
 struct
   {                   /* <--- line 48, error below occurs here */
     tree value;		/* The value to profile.  */
     tree stmt;		/* Insn containing the value.  */
     gcov_type *counters;		        /* Pointer to first counter.  */
     struct histogram_value_t *next;		/* Linked list pointer.  */
   } hvalue;
 enum hist_type type;			/* Type of information to measure.  */
 unsigned n_counters;			/* Number of required counters.  */
 union
   {
     struct
	{
	  int int_start;	/* First value in interval.  */
	  unsigned int steps;	/* Number of values in it.  */
	} intvl;	/* Interval histogram data.  */
   } hdata;		/* Profiled information specific data.  */
};


After my best effor so far:

struct histogram_value_t GTY(())
{
 struct
   {                        /* <--- line 48, error below occurs here */
     tree value;		/* The value to profile.  */
     tree stmt;		/* Insn containing the value.  */
     gcov_type *counters;		        /* Pointer to first counter.  */
     struct histogram_value_t GTY((chain_next("%h.next")) *next;		/*
Linked list pointer.  */
   } hvalue;
 enum hist_type type;			/* Type of information to measure.  */
 unsigned n_counters;			/* Number of required counters.  */
 union
   {
     struct
	{
	  int int_start;	/* First value in interval.  */
	  unsigned int steps;	/* Number of values in it.  */
	} intvl;	/* Interval histogram data.  */
   } GTY ((default("intvl")) hdata;		/* Profiled information specific data.  */
};

And this one gives a gengtype error:

../../gcc-boehm-custom-marking/gcc/value-prof.h:48: syntax error,
unexpected '*', expecting ')'

What should I do about it?

--
Laurynas