[Bug debug/51262] [4.7 Regression] ICE: SIGSEGV in primary_template_instantiation_p (pt.c:2874) with -flto -g

[jason at redhat dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51262

--- Comment #4 from Jason Merrill <jason at redhat dot com> 2011-12-09 03:25:17 UTC ---
On 12/08/2011 11:46 AM, rguenth at gcc dot gnu.org wrote:
> Dodji, Jason, can such anonymous name types ever have TYPE_DECL_ALIAS_P
> set?

They can't, but

> -  else if (CLASS_TYPE_P (t) &&  !TYPE_DECL_ALIAS_P (TYPE_NAME (t)))
> +  else if (CLASS_TYPE_P (t)
> +           && TYPE_NAME (t) && !TYPE_DECL_ALIAS_P (TYPE_NAME (t)))
>       return CLASSTYPE_TEMPLATE_INSTANTIATION (t)
>             && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t));

I would reverse the sense here so that the condition is satisfied by a 
null TYPE_NAME, since an anonymous union is a non-alias class.

Jason