http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54652
Bug #: 54652
Summary: ICE with -g
Classification: Unclassified
Product: gcc
Version: 4.7.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: ja...@gcc.gnu.org
CC: ja...@gcc.gnu.org
typedef unsigned long L __attribute__ ((aligned));
typedef unsigned long L __attribute__ ((aligned));
template <typename T>
struct S
{
union U { L l; } u;
};
S <int> s;
ICEs with -g, TYPE_NAME seems to be garbage.
The problem is that handle_aligned_attribute first (with L as decl):
tree tt = TREE_TYPE (decl);
*type = build_variant_type_copy (*type);
DECL_ORIGINAL_TYPE (decl) = tt;
TYPE_NAME (*type) = decl;
TREE_USED (*type) = TREE_USED (decl);
TREE_TYPE (decl) = *type;
then duplicate_decls is called on the L olddecl (with new L as newdecl), where
TYPE_NAME (TREE_TYPE (olddecl)) == olddecl and
TYPE_NAME (TREE_TYPE (newdecl)) == newdecl, in merge_types newdecl's type wins,
and eventually ggc_free (newdecl);
So, either something should have changed TYPE_NAME (newtype) from newdecl to
olddecl before ggc_free (I guess that would be preferred, but can't it be
TYPE_NAME of other related types too?), or we shouldn't ggc_free TYPE_DECLs.
Jason, can you please look into this?
