PL/1 frontend

[Diego Novillo]

On Thu, Nov 11, 2010 at 09:47, Merrick, Thomas
<Thomas.Merrick@tamucc.edu> wrote:

> libbackend.a(coverage.o):(.rodata+0x20): undefined reference to `gt_ggc_mx_lang_tree_node'
> libbackend.a(coverage.o):(.rodata+0x24): undefined reference to `gt_pch_nx_lang_tree_node'
> libbackend.a(dbxout.o):(.rodata+0x180): undefined reference to `gt_ggc_mx_lang_tree_node'
> libbackend.a(dbxout.o):(.rodata+0x184): undefined reference to `gt_pch_nx_lang_tree_node'

You are likely missing a function like this:

/* Tree walking support.  */

static enum gimple_tree_node_structure_enum
gimple_tree_node_structure (union lang_tree_node *t ATTRIBUTE_UNUSED)
{
  return TS_GIMPLE_GENERIC;
}

And a counterpart structure

union GTY((desc ("gimple_tree_node_structure (&%h)"),
          chain_next ("(union lang_tree_node *)TREE_CHAIN (&%h.generic)")))
    lang_tree_node
{
  union tree_node GTY ((tag ("TS_GIMPLE_GENERIC"),
                        desc ("tree_node_structure (&%h)"))) generic;
};


I believe that Ian Taylor had some tutorial notes on writing front
ends.  Ian, am I dreaming again?


Diego.