[Bug debug/46132] New: ICE: in force_decl_die, at dwarf2out.c:20525 with -fenable-icf-debug

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46132

           Summary: ICE: in force_decl_die, at dwarf2out.c:20525 with
                    -fenable-icf-debug
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: zsojka@seznam.cz


Created attachment 22123
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22123
reduced testcase

Compiler output:
$ gcc -O -g -fenable-icf-debug pr46132.c 
pr46132.c: In function 'regex_subst':
pr46132.c:5:1: internal compiler error: in force_decl_die, at dwarf2out.c:20525
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

Compiler output - 4.5:
$ gcc -O -g -fenable-icf-debug pr46132.c 
pr46132.c: In function 'foo':
pr46132.c:4:1: internal compiler error: tree check: expected tree that contains
'decl minimal' structure, have 'string_cst' in lookup_decl_die, at
dwarf2out.c:7701
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

Another issue with -fenable-icf-debug is PR44689

Tested revisions:
r165822 - crash
r153685 - crash
4.5 r165781 - crash