Hi,
due to the bitfield handling changes, C++ frontend now ICEs on this:
Cut
struct A { unsigned a:8; };
extern void b(unsigned char);
void breakme (A f)
{
b((unsigned char) f.a);
}
Cut
bitfield-ice-1.cc: In function 'void breakme(A)':
bitfield-ice-1.cc:7: internal compiler error: in build_c_cast, at
cp/typeck.c:5434
Please submit a full bug report,
with preprocessed source if appropriate.
See <for instructions.

Comment #1 from pinskia at gcc dot gnu dot org 2006-05-07 17:00
Confirmed.

Comment #2 from mueller at gcc dot gnu dot org 2006-05-08 19:54
raising severity because it triggers frequently

Comment #3 from kazu at gcc dot gnu dot org 2006-05-17 20:39
Assigning to Mark Mitchell as he agreed.

Comment #4 from mmitchel at gcc dot gnu dot org 2006-05-19 03:01
Subject: Bug 27471

Author: mmitchel
Date: Fri May 19 03:01:14 2006
New Revision: 113902

URL:
Log:
PR c++/27471
PR c++/27506
* typeck.c (decay_conversion): Convert bitfields to their declared
types here. Improve documentation. Avoid use of cp_convert.
(default_conversion): Make it static. Perform integral promotions
before lvalue-to-rvalue, function-to-pointer, and array-to-pointer
conversions.
* init.c (build_init): Remove.
(expand_default_init): Do not call rvalue.
* call.c (null_ptr_cst_p): Robustify.
(build_conditional_expr): Tidy.
* except.c (build_throw): Do not perform lvalue-to-rvalue
conversion on operand before initializing temporary.
* tree.c (convert.h): Include it.
(): Use convert_to_integer, not
cp_convert.
(rvalue): Don't convert bitfields to their declared type here.
* cp-tree.h (build_init): Remove.
(default_conversion): Likewise.
* typeck2.c (build_m_component_ref): Do not perform
lvalue-to-rvalue, function-to-pointer, or array-to-pointer
conversions here. Correct error message.
PR c++/27471
PR c++/27506
* gdg/conversion/bitfield5.C: New test.
* gdg/conversion/bitfield6.C: New test.

Added:

Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/call.c
trunk/gcc/cp/cp-tree.h
trunk/gcc/cp/except.c
trunk/gcc/cp/init.c
trunk/gcc/cp/tree.c
trunk/gcc/cp/typeck.c
trunk/gcc/cp/typeck2.c
trunk/gcc/testsuite/ChangeLog

Comment #5 from mmitchel at gcc dot gnu dot org 2006-05-19 03:06
Fixed in 4.2.0.