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Subject: [Bug debug/45865] [4.6 regression] Failed to build 403.gcc in SPEC CPU 2006
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45865

--- Comment #6 from H.J. Lu <hjl.tools at gmail dot com> 2010-10-09 22:45:44 UTC ---
A small testcase

--
[hjl@gnu-6 gcc]$ cat /export/gnu/import/delta/foo.c
typedef union tree_node *tree;
enum ix86_builtin_type {
  IX86_BT_LAST_VECT,
  IX86_BT_LAST_PTR
};
extern const enum ix86_builtin_type ix86_builtin_type_ptr_base[];
extern tree build_qualified_type (tree, int);
extern tree build_pointer_type (tree);
tree
ix86_get_builtin_type (enum ix86_builtin_type tcode, unsigned int index)
{
  tree type, itype;
  int quals;
  if (tcode <= IX86_BT_LAST_PTR)
    quals = 0x0;
  else
    quals = 0x1;
  itype = ix86_get_builtin_type (ix86_builtin_type_ptr_base[index],
                 index);
  if (quals != 0x0)
    itype = build_qualified_type (itype, quals);
  type = build_pointer_type (itype);
  return type;
}
[hjl@gnu-6 gcc]$ ./xgcc -B./ -O2 -g -fcompare-debug  -S -m32
/export/gnu/import/delta/foo.c -Wall
xgcc: error: /export/gnu/import/delta/foo.c: -fcompare-debug failure (length)
[hjl@gnu-6 gcc]$ 
----