GCC Bugzilla Bug 26883

The following (perhaps questionable) code causes an ICE in in
set_mem_attributes_minus_bitpos, at emit-rtl.c:1539

compile command line:
avr-g++ -mmcu=atmega128 -c -o romproblems.o romproblems.cpp

program:

#define PROGMEM __attribute__((__progmem__))

struct ROMVar1
{
    int const val;
    ROMVar1(int const& init) : val(init) { }
};

ROMVar1 PROGMEM rv1b(123);

We ICE in

      if (base && DECL_P (base)
          && TREE_READONLY (base)
          && (TREE_STATIC (base) || DECL_EXTERNAL (base)))
        {
          tree base_type = TREE_TYPE (base);
          gcc_assert (!(base_type && TYPE_NEEDS_CONSTRUCTING (base_type))
                      || DECL_ARTIFICIAL (base));
          MEM_READONLY_P (ref) = 1;

Now, it is indeed questionable to put a non-POD into ro memory.  So I think
this is INVALID - but let's see what others think.

(In reply to comment #1)
> We ICE in
> Now, it is indeed questionable to put a non-POD into ro memory.  So I think
> this is INVALID - but let's see what others think.

The target should have rejected progmem and not placed const on the decl.