[Bug compile/18202] New: [compile] cv-qualified self-references crash

["jan.kratochvil at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18202

            Bug ID: 18202
           Summary: [compile] cv-qualified self-references crash
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: compile
          Assignee: unassigned at sourceware dot org
          Reporter: jan.kratochvil at redhat dot com

Created attachment 8225
  --> https://sourceware.org/bugzilla/attachment.cgi?id=8225&action=edit
reproducer for GDB

gdb/testsuite/gdb.compile/compile.c
struct struct_type {
-  struct struct_type *selffield;
+  volatile struct struct_type *selffield;

->
compile code struct_object.selffield = &struct_object
gdb command line:1:1: internal compiler error: Segmentation fault

This is because selffield has !COMPLETE_TYPE_P as at that time struct
struct_type is not yet complete and the cv-qualifier creates a copy (not
reference) of the type inside GCC.

I guess cv-qualified self-references will need to create opaque type inside
GCC.

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