4.0 regression: missing debug info for global variables in C

[Paolo Bonzini]

>>Maybe this is responsible for part of PR21828?
>>    
>>
>I'd say this *is* PR21828: note that the variables whose
>type is unknown are global variables in C code compiled
>with -O2 ...
>  
>
Oh, of course.  I was confusing with the first part:

  Run till exit from #0 mangle_macro_name ([snip]) at ../../gcc/gengtype-lex.l:429
  yylex () at ../../gcc/gengtype-lex.l:263
  263       t = find_structure (ptr, 0);
  Value returned is $1 = 0x11ccb0 "VEC_tree"
  (gdb) p ptr
  No symbol "ptr" in current context.

where ptr is not global.  But -fno-tree-lrs or whatever the option is 
called should help with that.

I've updated PR21828 so that it does not refer to stabs.

Paolo