[Bug c++/26790] New: ICE with -fmudflap returning an incomplete struct

["reichelt at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

Compiling the following testcase with "g++ -fmudflap" yields
an ICE since GCC 4.0.0 (i.e. this is not a regression):

=================
struct A;

A foo()
{
    A a;
    return a;
}
=================

bug.cc: In function 'A foo()':
bug.cc:3: error: return type 'struct A' is incomplete
bug.cc:5: error: aggregate 'A a' has incomplete type and cannot be defined
bug.cc:3: internal compiler error: tree check: expected class 'type', have
'exceptional' (error_mark) in mf_xform_derefs_1, at tree-mudflap.c:731
Please submit a full bug report, [etc.]

Testing a patch.


-- 
           Summary: ICE with -fmudflap returning an incomplete struct
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Keywords: ice-on-invalid-code, monitored
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: reichelt at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26790