arm.c (arm_expand_prologue): Use 0-length rtvec instead of NULL_RTVEC.

        * config/arm/arm.c (arm_expand_prologue): Use 0-length rtvec
        instead of NULL_RTVEC.

From-SVN: r138317

gcc/ChangeLog

 2008-07-30  Nathan Froyd  <froydnj@codesourcery.com>
 
+        * config/arm/arm.c (arm_expand_prologue): Use 0-length rtvec
+        instead of NULL_RTVEC.
+
+2008-07-30  Nathan Froyd  <froydnj@codesourcery.com>
+
 	PR target/35866
 
 	* config/rs6000/rs6000.h (SLOW_UNALIGNED_ACCESS): Add clause for

gcc/config/arm/arm.c

@@ -12438,7 +12438,9 @@ arm_expand_prologue (void)
 
       r0 = gen_rtx_REG (SImode, 0);
       r1 = gen_rtx_REG (SImode, 1);
-      dwarf = gen_rtx_UNSPEC (SImode, NULL_RTVEC, UNSPEC_STACK_ALIGN);
+      /* Use a real rtvec rather than NULL_RTVEC so the rest of the
+	 compiler won't choke.  */
+      dwarf = gen_rtx_UNSPEC (SImode, rtvec_alloc (0), UNSPEC_STACK_ALIGN);
       dwarf = gen_rtx_SET (VOIDmode, r0, dwarf);
       insn = gen_movsi (r0, stack_pointer_rtx);
       RTX_FRAME_RELATED_P (insn) = 1;