[Bug c++/46868] New: [4.6 Regression] ICE: SIGSEGV splay_tree_splay (splay-tree.c:149) on invalid code

["zsojka at seznam dot cz" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46868

           Summary: [4.6 Regression] ICE: SIGSEGV splay_tree_splay
                    (splay-tree.c:149) on invalid code
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: zsojka@seznam.cz


------ testcase.C ------
template < int > struct S { S <
------------------------

valgrind output:
$ gcc testcase.C
testcase.C:1:31: error: template argument 1 is invalid
testcase.C:1:29: error: expected unqualified-id at end of input
testcase.C:1:29: error: expected '}' at end of input
cc1plus: error: expected ';' after struct definition
==15288== Invalid read of size 1
==15288==    at 0x4C284A1: strcmp (in
/usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==15288==    by 0x11F354A: splay_tree_splay (splay-tree.c:149)
==15288==    by 0x11F3B9D: splay_tree_lookup (splay-tree.c:456)
==15288==    by 0x6BE534: get_fileinfo (c-lex.c:110)
==15288==    by 0x5C6770: cxx_make_type (lex.c:684)
==15288==    by 0x5C6868: make_class_type (lex.c:695)
==15288==    by 0x52B473: xref_tag (decl.c:11184)
==15288==    by 0x5F454C: emit_support_tinfos (rtti.c:1485)
==15288==    by 0x5B6982: cp_write_global_declarations (decl2.c:3668)
==15288==    by 0xA21C45: toplev_main (toplev.c:591)
==15288==    by 0x6369BBC: (below main) (in /lib64/libc-2.11.2.so)
==15288==  Address 0x0 is not stack'd, malloc'd or (recently) free'd
==15288== 
cc1plus: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

Tested revisions:
r167621 - crash
4.5.1 - OK