Calling gen_nop.

[Richard Earnshaw]

The new arm backend is currently failing g++.law.profile1.C because 
toplev.c is trying to output a NOP at the start of the file, but is trying 
to do so without generating RTL.  With the new ARM back-end this fails 
because what we output is dependent on whether we are generating ARM or 
Thumb code (and this breaks an assumption here that a NOP is a NOP is a 
NOP and will always be the same).  The result is that the compiler aborts 
in get_insn_template.

The code in question is in compile_file() and reads:

  if (profile_flag || profile_block_flag)
    {
      /* It's best if we can write a nop here since some
         assemblers don't tolerate zeros in the text section.  */
      output_asm_insn (get_insn_template (CODE_FOR_nop, NULL), NULL_PTR);
    }

Is it safe to call gen_nop() here to create a real insn?  If so, what, if 
anything, will I need to reset after emitting the insn?  Is there a better 
way of solving this?

R.