g++ gives an ICE on the following source (no optimization required):
$ ~/gcc/build/gcc/cc1plus -quiet x.cc x.cc: In function 'C f(const C&)': x.cc:6: internal compiler error: in check_pointer_types_r, at gimplify.c:4198 Please submit a full bug report, with preprocessed source if appropriate. See <URL:http://gcc.gnu.org/bugs.html> for instructions. $ It's crashing here: case ADDR_EXPR: ptype = TREE_TYPE (t); otype = TREE_TYPE (TREE_OPERAND (t, 0)); dtype = TREE_TYPE (ptype); if (!cpt_same_type (otype, dtype)) { /* &array is allowed to produce a pointer to the element, rather than a pointer to the array type. We must allow this in order to properly represent assigning the address of an array in C into pointer to the element type. */ gcc_assert (TREE_CODE (otype) == ARRAY_TYPE && POINTER_TYPE_P (ptype) && cpt_same_type (TREE_TYPE (otype), dtype)); break; } because OTYPE isn't an ARRAY_TYPE: (gdb) call debug_tree(otype) <reference_type 0x400be2b8 type <record_type 0x400b6bc8 C addressable tree_2 needs-constructing type_1 type_5 BLK size <integer_cst 0x400243d8 constant invariant 32> unit size <integer_cst 0x40024168 constant invariant 4> align 32 symtab 0 alias set -1 fields <field_decl 0x400b932c _vptr.C type <pointer_type 0x40094e0c> unsigned virtual SI file x.cc line 2 size <integer_cst 0x400243d8 32> unit size <integer_cst 0x40024168 4> align 32 offset_align 128 offset <integer_cst 0x40024180 constant invariant 0> bit offset <integer_cst 0x40024948 constant invariant 0> context <record_type 0x400b6bc8 C> arguments <integer_cst 0x40024180 0> chain <type_decl 0x400b6d98 C>> needs-constructor X() X(constX&) this=(X&) n_parents=0 use_template=0 interface-unknown pointer_to_this <pointer_type 0x400b9000> reference_to_this <reference_type 0x400be2b8> chain <type_decl 0x400b6cb0 C>> unsigned SI size <integer_cst 0x400243d8 32> unit size <integer_cst 0x40024168 4> align 32 symtab 0 alias set -1> Environment: System: Linux karma 2.6.8.1 #20 Mon Sep 13 23:48:47 EDT 2004 i686 i686 i386 GNU/Linux Architecture: i686 <machine, os, target, libraries (multiple lines)> host: i686-pc-linux-gnu build: i686-pc-linux-gnu target: i686-pc-linux-gnu configured with: /home/sss/gcc/gcc/configure --prefix=/usr/local/gcc --enable-threads=posix --enable-long-long --enable-languages=c,c++,f95 How-To-Repeat: Compile the following: ------------------------------------------------------ struct C { virtual void operator()() const; }; C f(const C& c) { C cc (c); cc(); return cc; } ------------------------------------------------------ ------- Additional Comments From sss at d0mino03 dot fnal dot gov 2004-12-15 22:26 ------- Fix: <how to correct or work around the problem, if known (multiple lines)> -- Summary: ICE in check_pointer_types_r Product: gcc Version: 0.0 Status: UNCONFIRMED Severity: critical Priority: P2 Component: middle-end AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: sss at d0mino03 dot fnal dot gov CC: gcc-bugs at gcc dot gnu dot org GCC build triplet: i686-pc-linux-gnu GCC host triplet: i686-pc-linux-gnu GCC target triplet: i686-pc-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19023
