[Bug c++/42219] New: [4.5 Regression] ICE with "const void" as parameter type

[Bug c++/42219] New: [4.5 Regression] ICE with "const void" as parameter type

[reichelt at gcc dot gnu dot org]

The following invalid code snippet triggers an ICE on trunk:

=============================
void foo(const void);

void bar()
{
  void (*pf)() = foo;
}
=============================

bug.cc:1:16: error: '<anonymous>' has incomplete type
bug.cc:1:20: error: invalid use of 'const void'
bug.cc: In function 'void bar()':
bug.cc:5:18: error: invalid conversion from 'void (*)(<type error>)' to 'void
(*)()'
bug.cc:5:18: internal compiler error: tree check: expected class 'type', have
'exceptional' (error_mark) in useless_type_conversion_p, at tree-ssa.c:1426
Please submit a full bug report, [etc.]


-- 
           Summary: [4.5 Regression] ICE with "const void" as parameter type
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Keywords: ice-on-invalid-code, error-recovery, 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=42219

[Bug c++/42219] [4.5 Regression] ICE with "const void" as parameter type

[reichelt at gcc dot gnu dot org]

-- 

reichelt at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.5.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42219

[Bug c++/42219] [4.5 Regression] ICE with "const void" as parameter type

[rguenth at gcc dot gnu dot org]

-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P4


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42219

[Bug c++/42219] [4.5 Regression] ICE with "const void" as parameter type

[hjl dot tools at gmail dot com]

------- Comment #1 from hjl dot tools at gmail dot com  2009-11-30 03:39 -------
It is caused by revision 150519:

http://gcc.gnu.org/ml/gcc-cvs/2009-08/msg00199.html


-- 

hjl dot tools at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rguenth at gcc dot gnu dot
                   |                            |org
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2009-11-30 03:39:26
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42219

[Bug c++/42219] [4.5 Regression] ICE with "const void" as parameter type

[rguenth at gcc dot gnu dot org]

------- Comment #2 from rguenth at gcc dot gnu dot org  2009-11-30 10:02 -------
Err - well.  I can certainly paper over the problem by ignoring
error_mark_node,
but ... why does the bogus type survive until gimplification?

Thus,

 <function_type 0x7ffff6f0cdc8
    type <void_type 0x7ffff7eeae70 void VOID
        align 8 symtab 0 alias set -1 canonical type 0x7ffff7eeae70
        pointer_to_this <pointer_type 0x7ffff7eeaf18>>
    QI
    size <integer_cst 0x7ffff7ed5730 type <integer_type 0x7ffff7eea0a8
bit_size_type> constant 8>
    unit size <integer_cst 0x7ffff7ed5758 type <integer_type 0x7ffff7eea000
long unsigned int> constant 1>
    align 8 symtab 0 alias set -1 structural equality
    arg-types <tree_list 0x7ffff6f01a78 value <error_mark 0x7ffff7eddc90>
        chain <tree_list 0x7ffff7efb578 value <void_type 0x7ffff7eeae70 void>>>
    pointer_to_this <pointer_type 0x7ffff6f1e0a8>>

as the type for foo in

  pf = (void (*<T3f1>) (void)) foo

?


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42219

[Bug c++/42219] [4.5 Regression] ICE with "const void" as parameter type

[jason at gcc dot gnu dot org]

------- Comment #3 from jason at gcc dot gnu dot org  2009-12-11 16:31 -------
The problem is that we create a FUNCTION_TYPE with error_mark_node parameter
type for error recovery, and then ptr_reasonably_similar tries to consider
conversions that are almost right in order to give better error messages (and
allow some with -fpermissive), and it thinks any function types are close
enough without noticing that we're dealing with an erroneous one.


-- 

jason at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |jason at gcc dot gnu dot org
                   |dot org                     |
             Status|NEW                         |ASSIGNED
   Last reconfirmed|2009-11-30 03:39:26         |2009-12-11 16:31:31
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42219

[Bug c++/42219] [4.5 Regression] ICE with "const void" as parameter type

[jason at gcc dot gnu dot org]

------- Comment #4 from jason at gcc dot gnu dot org  2009-12-11 21:04 -------
Subject: Bug 42219

Author: jason
Date: Fri Dec 11 21:03:55 2009
New Revision: 155177

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=155177
Log:
        PR c++/42219
        * typeck.c (error_type_p): New.
        (ptr_reasonably_similar): Use it.
        * cp-tree.h: Declare it.

Added:
    trunk/gcc/testsuite/g++.dg/conversion/err-recover1.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/cp-tree.h
    trunk/gcc/cp/typeck.c
    trunk/gcc/testsuite/ChangeLog


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42219

[Bug c++/42219] [4.5 Regression] ICE with "const void" as parameter type

[reichelt at gcc dot gnu dot org]

------- Comment #5 from reichelt at gcc dot gnu dot org  2009-12-14 08:46 -------
Fixed.


-- 

reichelt at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42219