How to GTYize a struct properly?

[Laurynas Biveinis]

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