-Wimplicit-fallthrough warning fixes

Comment changes.

bfd/
	* coff-h8300.c: Spell fall through comments consistently.
	* coffgen.c: Likewise.
	* elf32-hppa.c: Likewise.
	* elf32-ppc.c: Likewise.
	* elf32-score.c: Likewise.
	* elf32-score7.c: Likewise.
	* elf64-ppc.c: Likewise.
	* elfxx-aarch64.c: Likewise.
	* elfxx-mips.c: Likewise.
	* cpu-ns32k.c: Add missing fall through comments.
	* elf-m10300.c: Likewise.
	* elf32-arm.c: Likewise.
	* elf32-avr.c: Likewise.
	* elf32-bfin.c: Likewise.
	* elf32-frv.c: Likewise.
	* elf32-i386.c: Likewise.
	* elf32-microblaze.c: Likewise.
	* elf32-nds32.c: Likewise.
	* elf32-ppc.c: Likewise.
	* elf32-rl78.c: Likewise.
	* elf32-rx.c: Likewise.
	* elf32-s390.c: Likewise.
	* elf32-sh.c: Likewise.
	* elf32-tic6x.c: Likewise.
	* elf64-ia64-vms.c: Likewise.
	* elf64-ppc.c: Likewise.
	* elf64-s390.c: Likewise.
	* elf64-x86-64.c: Likewise.
	* elflink.c: Likewise.
	* elfnn-aarch64.c: Likewise.
	* elfnn-ia64.c: Likewise.
	* ieee.c: Likewise.
	* oasys.c: Likewise.
	* pdp11.c: Likewise.
	* srec.c: Likewise.
	* versados.c: Likewise.
opcodes/
	* aarch64-opc.c: Spell fall through comments consistently.
	* i386-dis.c: Likewise.
	* aarch64-dis.c: Add missing fall through comments.
	* aarch64-opc.c: Likewise.
	* arc-dis.c: Likewise.
	* arm-dis.c: Likewise.
	* i386-dis.c: Likewise.
	* m68k-dis.c: Likewise.
	* mep-asm.c: Likewise.
	* ns32k-dis.c: Likewise.
	* sh-dis.c: Likewise.
	* tic4x-dis.c: Likewise.
	* tic6x-dis.c: Likewise.
	* vax-dis.c: Likewise.
binutils/
	* dlltool.c: Spell fall through comments consistently.
	* objcopy.c: Likewise.
	* readelf.c: Likewise.
	* dwarf.c: Add missing fall through comments.
	* elfcomm.c: Likewise.
	* sysinfo.y: Likewise.
	* readelf.c: Likewise.  Also remove extraneous comments.
gas/
	* app.c: Add missing fall through comments.
	* dw2gencfi.c: Likewise.
	* expr.c: Likewise.
	* config/tc-alpha.c: Likewise.
	* config/tc-arc.c: Likewise.
	* config/tc-arm.c: Likewise.
	* config/tc-cr16.c: Likewise.
	* config/tc-crx.c: Likewise.
	* config/tc-dlx.c: Likewise.
	* config/tc-h8300.c: Likewise.
	* config/tc-hppa.c: Likewise.
	* config/tc-i370.c: Likewise.
	* config/tc-i386.c: Likewise.
	* config/tc-i960.c: Likewise.
	* config/tc-ia64.c: Likewise.
	* config/tc-m68hc11.c: Likewise.
	* config/tc-m68k.c: Likewise.
	* config/tc-mep.c: Likewise.
	* config/tc-metag.c: Likewise.
	* config/tc-microblaze.c: Likewise.
	* config/tc-mips.c: Likewise.
	* config/tc-ns32k.c: Likewise.
	* config/tc-rx.c: Likewise.
	* config/tc-score.c: Likewise.
	* config/tc-score7.c: Likewise.
	* config/tc-sh.c: Likewise.
	* config/tc-tic4x.c: Likewise.
	* config/tc-vax.c: Likewise.
	* config/tc-xstormy16.c: Likewise.
	* config/tc-z80.c: Likewise.
	* config/tc-z8k.c: Likewise.
	* config/obj-elf.c: Likewise.
	* config/tc-i386.c: Likewise.
	* depend.c: Spell fall through comments consistently.
	* config/tc-arm.c: Likewise.
	* config/tc-d10v.c: Likewise.
	* config/tc-i960.c: Likewise.
	* config/tc-ia64.c: Likewise.
	* config/tc-m68k.c: Likewise.
	* config/tc-mcore.c: Likewise.
	* config/tc-mep.c: Likewise.
	* config/tc-ns32k.c: Likewise.
	* config/tc-visium.c: Likewise.
	* config/tc-xstormy16.c: Likewise.
	* config/tc-z8k.c: Likewise.
gprof/
	* gprof.c: Add missing fall through comments.
ld/
	* lexsup.c: Spell fall through comments consistently and add
	missing fall through comments.

37 files changed, 193 insertions, 18 deletions

diff --git a/gas/ChangeLog b/gas/ChangeLog
index 5ccc133..d0b8489 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,5 +1,53 @@
 2016-10-06  Alan Modra  <amodra@gmail.com>
 
+	* app.c: Add missing fall through comments.
+	* dw2gencfi.c: Likewise.
+	* expr.c: Likewise.
+	* config/tc-alpha.c: Likewise.
+	* config/tc-arc.c: Likewise.
+	* config/tc-arm.c: Likewise.
+	* config/tc-cr16.c: Likewise.
+	* config/tc-crx.c: Likewise.
+	* config/tc-dlx.c: Likewise.
+	* config/tc-h8300.c: Likewise.
+	* config/tc-hppa.c: Likewise.
+	* config/tc-i370.c: Likewise.
+	* config/tc-i386.c: Likewise.
+	* config/tc-i960.c: Likewise.
+	* config/tc-ia64.c: Likewise.
+	* config/tc-m68hc11.c: Likewise.
+	* config/tc-m68k.c: Likewise.
+	* config/tc-mep.c: Likewise.
+	* config/tc-metag.c: Likewise.
+	* config/tc-microblaze.c: Likewise.
+	* config/tc-mips.c: Likewise.
+	* config/tc-ns32k.c: Likewise.
+	* config/tc-rx.c: Likewise.
+	* config/tc-score.c: Likewise.
+	* config/tc-score7.c: Likewise.
+	* config/tc-sh.c: Likewise.
+	* config/tc-tic4x.c: Likewise.
+	* config/tc-vax.c: Likewise.
+	* config/tc-xstormy16.c: Likewise.
+	* config/tc-z80.c: Likewise.
+	* config/tc-z8k.c: Likewise.
+	* config/obj-elf.c: Likewise.
+	* config/tc-i386.c: Likewise.
+	* depend.c: Spell fall through comments consistently.
+	* config/tc-arm.c: Likewise.
+	* config/tc-d10v.c: Likewise.
+	* config/tc-i960.c: Likewise.
+	* config/tc-ia64.c: Likewise.
+	* config/tc-m68k.c: Likewise.
+	* config/tc-mcore.c: Likewise.
+	* config/tc-mep.c: Likewise.
+	* config/tc-ns32k.c: Likewise.
+	* config/tc-visium.c: Likewise.
+	* config/tc-xstormy16.c: Likewise.
+	* config/tc-z8k.c: Likewise.
+
+2016-10-06  Alan Modra  <amodra@gmail.com>
+
 	* as.h (as_assert): Add ATTRIBUTE_NORETURN.
 
 2016-10-06  Alan Modra  <amodra@gmail.com>
diff --git a/gas/app.c b/gas/app.c
index 38d8e78..4b53ce7 100644
--- a/gas/app.c
+++ b/gas/app.c
@@ -695,6 +695,7 @@ do_scrub_chars (size_t (*get) (char *, size_t), char *tostart, size_t tolen)
 	      state = 9;
 	      break;
 	    }
+	  /* Fall through.  */
 	case 17:
 	  /* We have seen "af" at the start of a symbol,
 	     a ' here is a part of that symbol.  */
diff --git a/gas/config/obj-elf.c b/gas/config/obj-elf.c
index 8af563f..8d80c77 100644
--- a/gas/config/obj-elf.c
+++ b/gas/config/obj-elf.c
@@ -813,6 +813,7 @@ obj_elf_parse_section_letters (char *str, size_t len, bfd_boolean *is_clone)
 		}
 	      break;
 	    }
+	  /* Fall through.  */
 	default:
 	  {
 	    const char *bad_msg = _("unrecognized .section attribute:"
diff --git a/gas/config/tc-alpha.c b/gas/config/tc-alpha.c
index c70b164..f7656ec 100644
--- a/gas/config/tc-alpha.c
+++ b/gas/config/tc-alpha.c
@@ -1005,6 +1005,7 @@ tokenize_arguments (char *str,
 	    /* ... then fall through to plain expression.  */
 	    input_line_pointer = hold;
 	  }
+	  /* Fall through.  */
 
 	default:
 	  if (saw_arg && !saw_comma)
@@ -5583,6 +5584,7 @@ md_atof (int type, char *litP, int *sizeP)
     case 'G':
       /* vax_md_atof() doesn't like "G" for some reason.  */
       type = 'g';
+      /* Fall through.  */
     case 'F':
     case 'D':
       return vax_md_atof (type, litP, sizeP);
diff --git a/gas/config/tc-arc.c b/gas/config/tc-arc.c
index d480bf1..f28abf4 100644
--- a/gas/config/tc-arc.c
+++ b/gas/config/tc-arc.c
@@ -1836,7 +1836,7 @@ find_opcode_match (const struct arc_opcode_hash_entry *entry,
 		    if (tok[tokidx].X_op != O_constant)
 		      goto de_fault;
 		  }
-		  /* Fall-through */
+		  /* Fall through.  */
 		case O_constant:
 		  /* Check the range.  */
 		  if (operand->bits != 32
@@ -1908,6 +1908,7 @@ find_opcode_match (const struct arc_opcode_hash_entry *entry,
 			goto match_failed;
 		      break;
 		    }
+		  /* Fall through.  */
 		default:
 		de_fault:
 		  if (operand->default_reloc == 0)
@@ -1926,6 +1927,7 @@ find_opcode_match (const struct arc_opcode_hash_entry *entry,
 		    case O_tlsie:
 		      if (!(operand->flags & ARC_OPERAND_LIMM))
 			goto match_failed;
+		      /* Fall through.  */
 		    case O_absent:
 		      if (!generic_reloc_p (operand->default_reloc))
 			goto match_failed;
@@ -3022,6 +3024,7 @@ md_apply_fix (fixS *fixP,
     case BFD_RELOC_ARC_TLS_LE_32:
       gas_assert (!fixP->fx_addsy);
       gas_assert (!fixP->fx_subsy);
+      /* Fall through.  */
 
     case BFD_RELOC_ARC_GOTOFF:
     case BFD_RELOC_ARC_32_ME:
@@ -3047,6 +3050,7 @@ md_apply_fix (fixS *fixP,
 
     case BFD_RELOC_ARC_S21W_PCREL_PLT:
       reloc = BFD_RELOC_ARC_S21W_PCREL;
+      /* Fall through.  */
 
     case BFD_RELOC_ARC_S25W_PCREL:
     case BFD_RELOC_ARC_S21W_PCREL:
@@ -3868,6 +3872,7 @@ assemble_insn (const struct arc_opcode *opcode,
 	      image = insert_operand (image, operand, regs, NULL, 0);
 	      break;
 	    }
+	  /* Fall through.  */
 
 	default:
 	  /* This operand needs a relocation.  */
diff --git a/gas/config/tc-arm.c b/gas/config/tc-arm.c
index db6dd68..526131c 100644
--- a/gas/config/tc-arm.c
+++ b/gas/config/tc-arm.c
@@ -1276,6 +1276,7 @@ arm_reg_alt_syntax (char **ccp, char *start, struct reg_entry *reg,
 	if (*ccp != start && processor <= 15)
 	  return processor;
       }
+      /* Fall through.  */
 
     case REG_TYPE_MMXWC:
       /* WC includes WCG.  ??? I'm not sure this is true for all
@@ -17773,7 +17774,7 @@ opcode_lookup (char **str)
 	case OT_odd_infix_unc:
 	  if (!unified_syntax)
 	    return 0;
-	  /* else fall through */
+	  /* Fall through.  */
 
 	case OT_csuffix:
 	case OT_csuffixF:
@@ -22842,6 +22843,7 @@ md_apply_fix (fixS *	fixP,
     case BFD_RELOC_ARM_OFFSET_IMM:
       if (!fixP->fx_done && seg->use_rela_p)
 	value = 0;
+      /* Fall through.  */
 
     case BFD_RELOC_ARM_LITERAL:
       sign = value > 0;
@@ -23200,6 +23202,7 @@ md_apply_fix (fixS *	fixP,
 	  newval = md_chars_to_number (buf, INSN_SIZE);
 	  fixP->fx_done = 0;
 	}
+      /* Fall through.  */
 
     case BFD_RELOC_ARM_PLT32:
 #endif
@@ -24092,6 +24095,7 @@ tc_gen_reloc (asection *section, fixS *fixp)
 	  code = BFD_RELOC_8_PCREL;
 	  break;
 	}
+      /* Fall through.  */
 
     case BFD_RELOC_16:
       if (fixp->fx_pcrel)
@@ -24099,6 +24103,7 @@ tc_gen_reloc (asection *section, fixS *fixp)
 	  code = BFD_RELOC_16_PCREL;
 	  break;
 	}
+      /* Fall through.  */
 
     case BFD_RELOC_32:
       if (fixp->fx_pcrel)
@@ -24106,6 +24111,7 @@ tc_gen_reloc (asection *section, fixS *fixp)
 	  code = BFD_RELOC_32_PCREL;
 	  break;
 	}
+      /* Fall through.  */
 
     case BFD_RELOC_ARM_MOVW:
       if (fixp->fx_pcrel)
@@ -24113,6 +24119,7 @@ tc_gen_reloc (asection *section, fixS *fixp)
 	  code = BFD_RELOC_ARM_MOVW_PCREL;
 	  break;
 	}
+      /* Fall through.  */
 
     case BFD_RELOC_ARM_MOVT:
       if (fixp->fx_pcrel)
@@ -24120,6 +24127,7 @@ tc_gen_reloc (asection *section, fixS *fixp)
 	  code = BFD_RELOC_ARM_MOVT_PCREL;
 	  break;
 	}
+      /* Fall through.  */
 
     case BFD_RELOC_ARM_THUMB_MOVW:
       if (fixp->fx_pcrel)
@@ -24127,6 +24135,7 @@ tc_gen_reloc (asection *section, fixS *fixp)
 	  code = BFD_RELOC_ARM_THUMB_MOVW_PCREL;
 	  break;
 	}
+      /* Fall through.  */
 
     case BFD_RELOC_ARM_THUMB_MOVT:
       if (fixp->fx_pcrel)
@@ -24134,6 +24143,7 @@ tc_gen_reloc (asection *section, fixS *fixp)
 	  code = BFD_RELOC_ARM_THUMB_MOVT_PCREL;
 	  break;
 	}
+      /* Fall through.  */
 
     case BFD_RELOC_NONE:
     case BFD_RELOC_ARM_PCREL_BRANCH:
diff --git a/gas/config/tc-cr16.c b/gas/config/tc-cr16.c
index 40d9ba4..186cfb9 100644
--- a/gas/config/tc-cr16.c
+++ b/gas/config/tc-cr16.c
@@ -1165,6 +1165,7 @@ set_operand (char *operand, ins * cr16_ins)
     {
     case arg_ic:    /* Case $0x18.  */
       operandS++;
+      /* Fall through.  */
     case arg_c:     /* Case 0x18.  */
       /* Set constant.  */
       process_label_constant (operandS, cr16_ins);
@@ -1182,6 +1183,7 @@ set_operand (char *operand, ins * cr16_ins)
       *operandE = '\0';
       process_label_constant (operandS, cr16_ins);
       operandS = operandE;
+      /* Fall through.  */
     case arg_rbase: /* Case (r1) or (r1,r0).  */
       operandS++;
       /* Set register base.  */
@@ -1789,7 +1791,9 @@ print_constant (int nbits, int shift, argument *arg)
       break;
 
     case 21:
-      if ((nbits == 21) && (IS_INSN_TYPE (LD_STOR_INS))) nbits = 20;
+      if ((nbits == 21) && (IS_INSN_TYPE (LD_STOR_INS)))
+	nbits = 20;
+      /* Fall through.  */
     case 24:
     case 22:
     case 20:
diff --git a/gas/config/tc-crx.c b/gas/config/tc-crx.c
index 9a943d5..a9af5bb 100644
--- a/gas/config/tc-crx.c
+++ b/gas/config/tc-crx.c
@@ -730,6 +730,7 @@ set_operand (char *operand, ins * crx_ins)
     case arg_sc:    /* Case *+0x18.  */
     case arg_ic:    /* Case $0x18.  */
       operandS++;
+      /* Fall through.  */
     case arg_c:	    /* Case 0x18.  */
       /* Set constant.  */
       process_label_constant (operandS, crx_ins);
@@ -747,6 +748,7 @@ set_operand (char *operand, ins * crx_ins)
       *operandE = '\0';
       process_label_constant (operandS, crx_ins);
       operandS = operandE;
+      /* Fall through.  */
     case arg_rbase: /* Case (r1).  */
       operandS++;
       /* Set register base.  */
@@ -1279,6 +1281,7 @@ print_operand (int nbits, int shift, argument *arg)
       CRX_PRINT (0, getreg_image (arg->r), 12);
       CRX_PRINT (0, getreg_image (arg->i_r), 8);
       CRX_PRINT (0, arg->scale, 6);
+      /* Fall through.  */
     case arg_ic:
     case arg_c:
       print_constant (nbits, shift, arg);
diff --git a/gas/config/tc-d10v.c b/gas/config/tc-d10v.c
index 03b264d..e7cfcdf 100644
--- a/gas/config/tc-d10v.c
+++ b/gas/config/tc-d10v.c
@@ -1548,7 +1548,7 @@ md_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED)
 	  if ( segf && segf->sym != fixP->fx_addsy)
 	    value = 0;
         }
-      /* Drop through.  */
+      /* Fall through.  */
     case BFD_RELOC_D10V_18:
       /* Instruction addresses are always right-shifted by 2.  */
       value >>= AT_WORD_RIGHT_SHIFT;
diff --git a/gas/config/tc-dlx.c b/gas/config/tc-dlx.c
index 079a9b6..a03aa19 100644
--- a/gas/config/tc-dlx.c
+++ b/gas/config/tc-dlx.c
@@ -780,6 +780,7 @@ machine_ip (char *str)
 	      reg_shift = 21;
 	      goto general_reg;
 	    }
+	  /* Fall through.  */
 
 	  /* The immediate 16 bits literal, bit 0-15.  */
 	case 'i':
diff --git a/gas/config/tc-h8300.c b/gas/config/tc-h8300.c
index 048d31e..28566a5 100644
--- a/gas/config/tc-h8300.c
+++ b/gas/config/tc-h8300.c
@@ -1432,6 +1432,7 @@ do_a_fix_imm (int offset, int nibble, struct h8_op *operand, int relaxmode, cons
 	  break;
 	default:
 	  as_bad (_("Can't work out size of operand.\n"));
+	  /* Fall through.  */
 	case L_16:
 	case L_16U:
 	  size = 2;
diff --git a/gas/config/tc-hppa.c b/gas/config/tc-hppa.c
index f5cdc2c..2ed06a2 100644
--- a/gas/config/tc-hppa.c
+++ b/gas/config/tc-hppa.c
@@ -5432,6 +5432,7 @@ pa_ip (char *str)
 		{
 		case SGL:
 		  opcode |= 0x20;
+		  /* Fall through.  */
 		case DBL:
 		  the_insn.fpof1 = flag;
 		  continue;
diff --git a/gas/config/tc-i370.c b/gas/config/tc-i370.c
index ac8aa95..6299cc7 100644
--- a/gas/config/tc-i370.c
+++ b/gas/config/tc-i370.c
@@ -956,6 +956,7 @@ i370_dc (int unused ATTRIBUTE_UNUSED)
       break;
     case 'E':  /* 32-bit */
       type = 'f';
+      /* Fall through.  */
     case 'D':  /* 64-bit */
       md_atof (type, tmp, &nbytes);
       p = frag_more (nbytes);
diff --git a/gas/config/tc-i386.c b/gas/config/tc-i386.c
index 660d23e..0ab9e1e 100644
--- a/gas/config/tc-i386.c
+++ b/gas/config/tc-i386.c
@@ -1374,9 +1374,11 @@ operand_type_all_zero (const union i386_operand_type *x)
     case 3:
       if (x->array[2])
 	return 0;
+      /* Fall through.  */
     case 2:
       if (x->array[1])
 	return 0;
+      /* Fall through.  */
     case 1:
       return !x->array[0];
     default:
@@ -1391,10 +1393,13 @@ operand_type_set (union i386_operand_type *x, unsigned int v)
     {
     case 3:
       x->array[2] = v;
+      /* Fall through.  */
     case 2:
       x->array[1] = v;
+      /* Fall through.  */
     case 1:
       x->array[0] = v;
+      /* Fall through.  */
       break;
     default:
       abort ();
@@ -1410,9 +1415,11 @@ operand_type_equal (const union i386_operand_type *x,
     case 3:
       if (x->array[2] != y->array[2])
 	return 0;
+      /* Fall through.  */
     case 2:
       if (x->array[1] != y->array[1])
 	return 0;
+      /* Fall through.  */
     case 1:
       return x->array[0] == y->array[0];
       break;
@@ -1429,9 +1436,11 @@ cpu_flags_all_zero (const union i386_cpu_flags *x)
     case 3:
       if (x->array[2])
 	return 0;
+      /* Fall through.  */
     case 2:
       if (x->array[1])
 	return 0;
+      /* Fall through.  */
     case 1:
       return !x->array[0];
     default:
@@ -1448,9 +1457,11 @@ cpu_flags_equal (const union i386_cpu_flags *x,
     case 3:
       if (x->array[2] != y->array[2])
 	return 0;
+      /* Fall through.  */
     case 2:
       if (x->array[1] != y->array[1])
 	return 0;
+      /* Fall through.  */
     case 1:
       return x->array[0] == y->array[0];
       break;
@@ -1473,8 +1484,10 @@ cpu_flags_and (i386_cpu_flags x, i386_cpu_flags y)
     {
     case 3:
       x.array [2] &= y.array [2];
+      /* Fall through.  */
     case 2:
       x.array [1] &= y.array [1];
+      /* Fall through.  */
     case 1:
       x.array [0] &= y.array [0];
       break;
@@ -1491,8 +1504,10 @@ cpu_flags_or (i386_cpu_flags x, i386_cpu_flags y)
     {
     case 3:
       x.array [2] |= y.array [2];
+      /* Fall through.  */
     case 2:
       x.array [1] |= y.array [1];
+      /* Fall through.  */
     case 1:
       x.array [0] |= y.array [0];
       break;
@@ -1509,8 +1524,10 @@ cpu_flags_and_not (i386_cpu_flags x, i386_cpu_flags y)
     {
     case 3:
       x.array [2] &= ~y.array [2];
+      /* Fall through.  */
     case 2:
       x.array [1] &= ~y.array [1];
+      /* Fall through.  */
     case 1:
       x.array [0] &= ~y.array [0];
       break;
@@ -1607,8 +1624,10 @@ operand_type_and (i386_operand_type x, i386_operand_type y)
     {
     case 3:
       x.array [2] &= y.array [2];
+      /* Fall through.  */
     case 2:
       x.array [1] &= y.array [1];
+      /* Fall through.  */
     case 1:
       x.array [0] &= y.array [0];
       break;
@@ -1625,8 +1644,10 @@ operand_type_or (i386_operand_type x, i386_operand_type y)
     {
     case 3:
       x.array [2] |= y.array [2];
+      /* Fall through.  */
     case 2:
       x.array [1] |= y.array [1];
+      /* Fall through.  */
     case 1:
       x.array [0] |= y.array [0];
       break;
@@ -1643,8 +1664,10 @@ operand_type_xor (i386_operand_type x, i386_operand_type y)
     {
     case 3:
       x.array [2] ^= y.array [2];
+      /* Fall through.  */
     case 2:
       x.array [1] ^= y.array [1];
+      /* Fall through.  */
     case 1:
       x.array [0] ^= y.array [0];
       break;
@@ -3928,6 +3951,7 @@ check_suffix:
 	  if (intel_syntax && (intel_float_operand (mnemonic) & 2))
 	    i.suffix = SHORT_MNEM_SUFFIX;
 	  else
+	    /* Fall through.  */
 	case BYTE_MNEM_SUFFIX:
 	case QWORD_MNEM_SUFFIX:
 	  i.suffix = mnem_p[-1];
@@ -4203,6 +4227,7 @@ swap_operands (void)
     case 5:
     case 4:
       swap_2_operands (1, i.operands - 2);
+      /* Fall through.  */
     case 3:
     case 2:
       swap_2_operands (0, i.operands - 1);
@@ -4942,11 +4967,13 @@ match_template (char mnem_suffix)
 	      else if (t->opcode_modifier.d)
 		goto check_reverse;
 	    }
+	  /* Fall through.  */
 
 	case 3:
 	  /* If we swap operand in encoding, we match the next one.  */
 	  if (i.swap_operand && t->opcode_modifier.s)
 	    continue;
+	  /* Fall through.  */
 	case 4:
 	case 5:
 	  overlap1 = operand_type_and (i.types[1], operand_types[1]);
@@ -4998,9 +5025,11 @@ check_reverse:
 		case 5:
 		  overlap4 = operand_type_and (i.types[4],
 					       operand_types[4]);
+		  /* Fall through.  */
 		case 4:
 		  overlap3 = operand_type_and (i.types[3],
 					       operand_types[3]);
+		  /* Fall through.  */
 		case 3:
 		  overlap2 = operand_type_and (i.types[2],
 					       operand_types[2]);
@@ -5018,6 +5047,7 @@ check_reverse:
 						       i.types[4],
 						       operand_types[4]))
 		    continue;
+		  /* Fall through.  */
 		case 4:
 		  if (!operand_type_match (overlap3, i.types[3])
 		      || (check_register
@@ -5028,6 +5058,7 @@ check_reverse:
 							   i.types[3],
 							   operand_types[3])))
 		    continue;
+		  /* Fall through.  */
 		case 3:
 		  /* Here we make use of the fact that there are no
 		     reverse match 3 operand instructions, and all 3
@@ -5370,6 +5401,7 @@ process_suffix (void)
 	      i.suffix = QWORD_MNEM_SUFFIX;
 	      break;
 	    }
+	  /* Fall through.  */
 	case CODE_32BIT:
 	  if (!i.tm.opcode_modifier.no_lsuf)
 	    i.suffix = LONG_MNEM_SUFFIX;
@@ -6953,6 +6985,7 @@ output_jump (void)
     {
     case 2:
       *p++ = i.tm.base_opcode >> 8;
+      /* Fall through.  */
     case 1:
       *p++ = i.tm.base_opcode;
       break;
@@ -10694,6 +10727,7 @@ tc_gen_reloc (asection *section ATTRIBUTE_UNUSED, fixS *fixp)
 	  return NULL;
 	}
 #endif
+      /* Fall through.  */
 
     case BFD_RELOC_X86_64_PLT32:
     case BFD_RELOC_X86_64_GOT32:
@@ -10746,6 +10780,7 @@ tc_gen_reloc (asection *section ATTRIBUTE_UNUSED, fixS *fixp)
 	  code = fixp->fx_r_type;
 	  break;
 	}
+      /* Fall through.  */
     default:
       if (fixp->fx_pcrel)
 	{
diff --git a/gas/config/tc-i960.c b/gas/config/tc-i960.c
index 5afbb6f..70ac379 100644
--- a/gas/config/tc-i960.c
+++ b/gas/config/tc-i960.c
@@ -1041,7 +1041,7 @@ parse_memop (memS *memP,	/* Where to put the results.  */
     case I_BIT:
       /* Treat missing displacement as displacement of 0.  */
       mode |= D_BIT;
-      /* Fall into next case.  */
+      /* Fall through.  */
     case D_BIT | A_BIT | I_BIT:
     case D_BIT | I_BIT:
       /* Set MEMB bit in mode, and OR in mode bits.  */
@@ -1676,6 +1676,7 @@ md_assemble (char *textP)
 	      mem_fmt (args, oP, 1);
 	      break;
 	    }
+	  /* Fall through.  */
 	case MEM2:
 	case MEM4:
 	case MEM8:
diff --git a/gas/config/tc-ia64.c b/gas/config/tc-ia64.c
index 83ea813..d6c2822 100644
--- a/gas/config/tc-ia64.c
+++ b/gas/config/tc-ia64.c
@@ -2738,6 +2738,7 @@ slot_index (unsigned long slot_addr,
 		as_fatal (_("Only constant offsets are supported"));
 		break;
 	      }
+	    /* Fall through.  */
 	  case rs_fill:
 	    s_index += 3 * (first_frag->fr_offset >> 4);
 	    break;
@@ -5635,6 +5636,7 @@ operand_match (const struct ia64_opcode *idesc, int res_index, expressionS *e)
       /* SOR must be an integer multiple of 8 */
       if (e->X_op == O_constant && e->X_add_number & 0x7)
 	return OPERAND_OUT_OF_RANGE;
+      /* Fall through.  */
     case IA64_OPND_SOF:
     case IA64_OPND_SOL:
       if (e->X_op == O_constant)
@@ -5790,6 +5792,7 @@ operand_match (const struct ia64_opcode *idesc, int res_index, expressionS *e)
     case IA64_OPND_IMM14:
     case IA64_OPND_IMM22:
       relocatable = 1;
+      /* Fall through.  */
     case IA64_OPND_IMM1:
     case IA64_OPND_IMM8:
     case IA64_OPND_IMM8U4:
@@ -5929,6 +5932,7 @@ operand_match (const struct ia64_opcode *idesc, int res_index, expressionS *e)
 	  ++CURR_SLOT.num_fixups;
 	  return OPERAND_MATCH;
 	}
+      /* Fall through.  */
     case IA64_OPND_TAG13:
     case IA64_OPND_TAG13b:
       switch (e->X_op)
@@ -9281,6 +9285,7 @@ dep->name, idesc->name, (rsrc_write?"write":"read"), note)
 		    {
 		      specs[count++] = tmpl;
 		    }
+		  /* Fall through.  */
 		case AR_RSC:
 		  if (!rsrc_write &&
 		      (regno == AR_BSPSTORE
@@ -10263,7 +10268,7 @@ remove_marked_resource (struct rsrc *rs)
     case IA64_DVS_SPECIFIC:
       if (md.debug_dv)
 	fprintf (stderr, "Implementation-specific, assume worst case...\n");
-      /* ...fall through...  */
+      /* Fall through.  */
     case IA64_DVS_INSTR:
       if (md.debug_dv)
 	fprintf (stderr, "Inserting instr serialization\n");
diff --git a/gas/config/tc-m68hc11.c b/gas/config/tc-m68hc11.c
index 2f80e0a..1fc52b1 100644
--- a/gas/config/tc-m68hc11.c
+++ b/gas/config/tc-m68hc11.c
@@ -2287,6 +2287,7 @@ build_indexed_byte (operand *op, int format ATTRIBUTE_UNUSED, int move_insn)
 
 	    default:
 	      as_bad (_("Invalid accumulator register."));
+	      /* Fall through.  */
 
 	    case REG_D:
 	      byte = 0xE6;
diff --git a/gas/config/tc-m68k.c b/gas/config/tc-m68k.c
index 4d2c0e4..4f64f5c 100644
--- a/gas/config/tc-m68k.c
+++ b/gas/config/tc-m68k.c
@@ -3003,7 +3003,7 @@ m68k_ip (char *instring)
 				TAB (ABSTOPCREL, SZ_UNDEF));
 		      break;
 		    }
-		  /* Fall through into long.  */
+		  /* Fall through.  */
 		case SIZE_LONG:
 		  if (isvar (&opP->disp))
 		    add_fix ('l', &opP->disp, 0, 0);
@@ -3109,6 +3109,7 @@ m68k_ip (char *instring)
 	      break;
 	    case '3':
 	      tmpreg &= 0xFF;
+	      /* Fall through.  */
 	    case '8':
 	    case 'C':
 	    case 'j':
diff --git a/gas/config/tc-mcore.c b/gas/config/tc-mcore.c
index 468a01b..ec03a29 100644
--- a/gas/config/tc-mcore.c
+++ b/gas/config/tc-mcore.c
@@ -979,7 +979,7 @@ md_assemble (char * str)
 	  as_bad (_("M340 specific opcode used when assembling for M210"));
 	  break;
 	}
-      /* drop through...  */
+      /* Fall through.  */
     case O2:
       op_end = parse_reg (op_end + 1, & reg);
       inst |= reg;
diff --git a/gas/config/tc-mep.c b/gas/config/tc-mep.c
index f018f74..dac10c9 100644
--- a/gas/config/tc-mep.c
+++ b/gas/config/tc-mep.c
@@ -1708,7 +1708,7 @@ md_convert_frag (bfd *abfd  ATTRIBUTE_UNUSED,
 	    operand = MEP_OPERAND_PCREL17A2;
 	    break;
 	  }
-	/* ...FALLTHROUGH... */
+	/* Fall through.  */
 
       case MEP_INSN_JMP:
 	addend = target_address_for (fragP);
@@ -1723,6 +1723,7 @@ md_convert_frag (bfd *abfd  ATTRIBUTE_UNUSED,
 
       case MEP_INSN_BNEZ:
 	bit = 1;
+	/* Fall through.  */
       case MEP_INSN_BEQZ:
 	fragP->fr_opcode[1^e] = bit | (addend & 0xfe);
 	operand = MEP_OPERAND_PCREL8A2;
@@ -1730,6 +1731,7 @@ md_convert_frag (bfd *abfd  ATTRIBUTE_UNUSED,
 
       case MEP_INSN_BNEI:
 	bit = 4;
+	/* Fall through.  */
       case MEP_INSN_BEQI:
 	if (subtype_mappings[fragP->fr_subtype].growth)
 	  {
diff --git a/gas/config/tc-metag.c b/gas/config/tc-metag.c
index e9f8687..b56f9d2 100644
--- a/gas/config/tc-metag.c
+++ b/gas/config/tc-metag.c
@@ -2683,6 +2683,7 @@ parse_alu (const char *line, metag_insn *insn,
 	      insn->bits |= (1 << 7);
 	      break;
 	    }
+	  /* Fall through.  */
 	default:
 	  as_bad (_("invalid quickrot register specified"));
 	  return NULL;
diff --git a/gas/config/tc-microblaze.c b/gas/config/tc-microblaze.c
index b4985f0..286efd4 100644
--- a/gas/config/tc-microblaze.c
+++ b/gas/config/tc-microblaze.c
@@ -2132,6 +2132,7 @@ md_apply_fix (fixS *   fixP,
     case BFD_RELOC_MICROBLAZE_64_TLSGD:
     case BFD_RELOC_MICROBLAZE_64_TLSLD:
       S_SET_THREAD_LOCAL (fixP->fx_addsy);
+      /* Fall through.  */
 
     case BFD_RELOC_MICROBLAZE_64_GOTPC:
     case BFD_RELOC_MICROBLAZE_64_GOT:
diff --git a/gas/config/tc-mips.c b/gas/config/tc-mips.c
index 224b9d0..283ed80 100644
--- a/gas/config/tc-mips.c
+++ b/gas/config/tc-mips.c
@@ -9848,6 +9848,7 @@ macro (struct mips_cl_insn *ip, char *str)
     {
     case M_DABS:
       dbl = 1;
+      /* Fall through.  */
     case M_ABS:
       /*    bgez    $a0,1f
 	    move    v0,$a0
@@ -9997,6 +9998,7 @@ macro (struct mips_cl_insn *ip, char *str)
 
     case M_BGEL:
       likely = 1;
+      /* Fall through.  */
     case M_BGE:
       if (op[1] == 0)
 	macro_build_branch_rs (likely ? M_BGEZL : M_BGEZ, &offset_expr, op[0]);
@@ -10022,6 +10024,7 @@ macro (struct mips_cl_insn *ip, char *str)
 
     case M_BGTL_I:
       likely = 1;
+      /* Fall through.  */
     case M_BGT_I:
       /* Check for > max integer.  */
       if (imm_expr.X_add_number >= GPR_SMAX)
@@ -10068,6 +10071,7 @@ macro (struct mips_cl_insn *ip, char *str)
 
     case M_BGEUL:
       likely = 1;
+      /* Fall through.  */
     case M_BGEU:
       if (op[1] == 0)
 	goto do_true;
@@ -10085,6 +10089,7 @@ macro (struct mips_cl_insn *ip, char *str)
 
     case M_BGTUL_I:
       likely = 1;
+      /* Fall through.  */
     case M_BGTU_I:
       if (op[0] == 0
 	  || (GPR_SIZE == 32
@@ -10112,6 +10117,7 @@ macro (struct mips_cl_insn *ip, char *str)
 
     case M_BGTL:
       likely = 1;
+      /* Fall through.  */
     case M_BGT:
       if (op[1] == 0)
 	macro_build_branch_rs (likely ? M_BGTZL : M_BGTZ, &offset_expr, op[0]);
@@ -10128,6 +10134,7 @@ macro (struct mips_cl_insn *ip, char *str)
 
     case M_BGTUL:
       likely = 1;
+      /* Fall through.  */
     case M_BGTU:
       if (op[1] == 0)
 	macro_build_branch_rsrt (likely ? M_BNEL : M_BNE,
@@ -10145,6 +10152,7 @@ macro (struct mips_cl_insn *ip, char *str)
 
     case M_BLEL:
       likely = 1;
+      /* Fall through.  */
     case M_BLE:
       if (op[1] == 0)
 	macro_build_branch_rs (likely ? M_BLEZL : M_BLEZ, &offset_expr, op[0]);
@@ -10161,6 +10169,7 @@ macro (struct mips_cl_insn *ip, char *str)
 
     case M_BLEL_I:
       likely = 1;
+      /* Fall through.  */
     case M_BLE_I:
       if (imm_expr.X_add_number >= GPR_SMAX)
 	goto do_true;
@@ -10185,6 +10194,7 @@ macro (struct mips_cl_insn *ip, char *str)
 
     case M_BLEUL:
       likely = 1;
+      /* Fall through.  */
     case M_BLEU:
       if (op[1] == 0)
 	macro_build_branch_rsrt (likely ? M_BEQL : M_BEQ,
@@ -10202,6 +10212,7 @@ macro (struct mips_cl_insn *ip, char *str)
 
     case M_BLEUL_I:
       likely = 1;
+      /* Fall through.  */
     case M_BLEU_I:
       if (op[0] == 0
 	  || (GPR_SIZE == 32
@@ -10229,6 +10240,7 @@ macro (struct mips_cl_insn *ip, char *str)
 
     case M_BLTL:
       likely = 1;
+      /* Fall through.  */
     case M_BLT:
       if (op[1] == 0)
 	macro_build_branch_rs (likely ? M_BLTZL : M_BLTZ, &offset_expr, op[0]);
@@ -10245,6 +10257,7 @@ macro (struct mips_cl_insn *ip, char *str)
 
     case M_BLTUL:
       likely = 1;
+      /* Fall through.  */
     case M_BLTU:
       if (op[1] == 0)
 	goto do_false;
@@ -10262,11 +10275,13 @@ macro (struct mips_cl_insn *ip, char *str)
 
     case M_DDIV_3:
       dbl = 1;
+      /* Fall through.  */
     case M_DIV_3:
       s = "mflo";
       goto do_div3;
     case M_DREM_3:
       dbl = 1;
+      /* Fall through.  */
     case M_REM_3:
       s = "mfhi";
     do_div3:
@@ -10458,11 +10473,13 @@ macro (struct mips_cl_insn *ip, char *str)
 
     case M_DLCA_AB:
       dbl = 1;
+      /* Fall through.  */
     case M_LCA_AB:
       call = 1;
       goto do_la;
     case M_DLA_AB:
       dbl = 1;
+      /* Fall through.  */
     case M_LA_AB:
     do_la:
       /* Load the address of a symbol into a register.  If breg is not
@@ -12685,6 +12702,7 @@ macro (struct mips_cl_insn *ip, char *str)
 
     case M_DMUL:
       dbl = 1;
+      /* Fall through.  */
     case M_MUL:
       if (mips_opts.arch == CPU_R5900)
 	macro_build (NULL, dbl ? "dmultu" : "multu", "d,s,t", op[0], op[1],
@@ -12698,6 +12716,7 @@ macro (struct mips_cl_insn *ip, char *str)
 
     case M_DMUL_I:
       dbl = 1;
+      /* Fall through.  */
     case M_MUL_I:
       /* The MIPS assembler some times generates shifts and adds.  I'm
 	 not trying to be that fancy. GCC should do this for us
@@ -12710,12 +12729,14 @@ macro (struct mips_cl_insn *ip, char *str)
 
     case M_DMULO_I:
       dbl = 1;
+      /* Fall through.  */
     case M_MULO_I:
       imm = 1;
       goto do_mulo;
 
     case M_DMULO:
       dbl = 1;
+      /* Fall through.  */
     case M_MULO:
     do_mulo:
       start_noreorder ();
@@ -12747,12 +12768,14 @@ macro (struct mips_cl_insn *ip, char *str)
 
     case M_DMULOU_I:
       dbl = 1;
+      /* Fall through.  */
     case M_MULOU_I:
       imm = 1;
       goto do_mulou;
 
     case M_DMULOU:
       dbl = 1;
+      /* Fall through.  */
     case M_MULOU:
     do_mulou:
       start_noreorder ();
@@ -13456,11 +13479,13 @@ mips16_macro (struct mips_cl_insn *ip)
 
     case M_DDIV_3:
       dbl = 1;
+      /* Fall through.  */
     case M_DIV_3:
       s = "mflo";
       goto do_div3;
     case M_DREM_3:
       dbl = 1;
+      /* Fall through.  */
     case M_REM_3:
       s = "mfhi";
     do_div3:
@@ -13505,6 +13530,7 @@ mips16_macro (struct mips_cl_insn *ip)
 
     case M_DMUL:
       dbl = 1;
+      /* Fall through.  */
     case M_MUL:
       macro_build (NULL, dbl ? "dmultu" : "multu", "x,y", op[1], op[2]);
       macro_build (NULL, "mflo", "x", op[0]);
diff --git a/gas/config/tc-ns32k.c b/gas/config/tc-ns32k.c
index a0db769..570916d 100644
--- a/gas/config/tc-ns32k.c
+++ b/gas/config/tc-ns32k.c
@@ -432,6 +432,7 @@ addr_mode (char *operand,
 		  addrmodeP->disp[0] = str + 2;
 		  return -1;
 		}
+	      /* Fall through.  */
 	    default:
 	      as_bad (_("Invalid syntax in PC-relative addressing mode"));
 	      return 0;
@@ -481,7 +482,7 @@ addr_mode (char *operand,
 	{
 	case 'f':
 	  addrmodeP->float_flag = 1;
-	  /* Drop through.  */
+	  /* Fall through.  */
 	case 'r':
 	  if (str[1] >= '0' && str[1] < '8')
 	    {
@@ -564,7 +565,7 @@ addr_mode (char *operand,
 		  str[strl - 4] = 0;
 		  return -1;		/* reg rel */
 		}
-	      /* Drop through.  */
+	      /* Fall through.  */
 
 	    default:
 	      if (!strncmp (&str[strl - 4], "(fp", 3))
@@ -925,6 +926,7 @@ encode_operand (int argc,
 	case 'f':		/* Operand of sfsr turns out to be a nasty
 				   specialcase.  */
 	  opcode_bit_ptr -= 5;
+	  /* Fall through.  */
 	case 'Z':		/* Float not immediate.  */
 	case 'F':		/* 32 bit float	general form.  */
 	case 'L':		/* 64 bit float.  */
diff --git a/gas/config/tc-rx.c b/gas/config/tc-rx.c
index bb0f689..07dccc6 100644
--- a/gas/config/tc-rx.c
+++ b/gas/config/tc-rx.c
@@ -2401,8 +2401,10 @@ md_apply_fix (struct fix * f ATTRIBUTE_UNUSED,
 
     case BFD_RELOC_RX_GPRELL:
       val >>= 1;
+      /* Fall through.  */
     case BFD_RELOC_RX_GPRELW:
       val >>= 1;
+      /* Fall through.  */
     case BFD_RELOC_RX_GPRELB:
 #if RX_OPCODE_BIG_ENDIAN
       op[1] = val & 0xff;
diff --git a/gas/config/tc-score.c b/gas/config/tc-score.c
index f96879b..f68cc6f 100644
--- a/gas/config/tc-score.c
+++ b/gas/config/tc-score.c
@@ -7453,6 +7453,7 @@ s3_gen_reloc (asection * section ATTRIBUTE_UNUSED, fixS * fixp)
           code = BFD_RELOC_32_PCREL;
           break;
         }
+      /* Fall through.  */
     case BFD_RELOC_HI16_S:
     case BFD_RELOC_LO16:
     case BFD_RELOC_SCORE_JMP:
diff --git a/gas/config/tc-score7.c b/gas/config/tc-score7.c
index 941467b..d7dd108 100644
--- a/gas/config/tc-score7.c
+++ b/gas/config/tc-score7.c
@@ -6930,6 +6930,7 @@ s7_gen_reloc (asection * section ATTRIBUTE_UNUSED, fixS * fixp)
           code = BFD_RELOC_32_PCREL;
           break;
         }
+      /* Fall through.  */
     case BFD_RELOC_HI16_S:
     case BFD_RELOC_LO16:
     case BFD_RELOC_SCORE_JMP:
diff --git a/gas/config/tc-sh.c b/gas/config/tc-sh.c
index f65fbb2..55966e0 100644
--- a/gas/config/tc-sh.c
+++ b/gas/config/tc-sh.c
@@ -2414,11 +2414,13 @@ build_Mytes (sh_opcode_info *opcode, sh_operand_info *operand)
 	      break;
 	    case IMM0_3s:
 	      nbuf[indx] |= 0x08;
+	      /* Fall through.  */
 	    case IMM0_3c:
 	      insert (output + low_byte, BFD_RELOC_SH_IMM3, 0, operand);
 	      break;
 	    case IMM0_3Us:
 	      nbuf[indx] |= 0x80;
+	      /* Fall through.  */
 	    case IMM0_3Uc:
 	      insert (output + low_byte, BFD_RELOC_SH_IMM3U, 0, operand);
 	      break;
diff --git a/gas/config/tc-tic4x.c b/gas/config/tc-tic4x.c
index 84c9ece..f86a535 100644
--- a/gas/config/tc-tic4x.c
+++ b/gas/config/tc-tic4x.c
@@ -2638,9 +2638,11 @@ md_apply_fix (fixS *fixP, valueT *value, segT seg ATTRIBUTE_UNUSED)
     {
     case BFD_RELOC_32:
       buf[3] = val >> 24;
+      /* Fall through.  */
     case BFD_RELOC_24:
     case BFD_RELOC_24_PCREL:
       buf[2] = val >> 16;
+      /* Fall through.  */
     case BFD_RELOC_16:
     case BFD_RELOC_16_PCREL:
     case BFD_RELOC_LO16:
@@ -2718,24 +2720,28 @@ md_parse_option (int c, const char *arg)
 
     case 'b':
       as_warn (_("Option -b is depreciated, please use -mbig"));
+      /* Fall through.  */
     case OPTION_BIG:             /* big model */
       tic4x_big_model = 1;
       break;
 
     case 'p':
       as_warn (_("Option -p is depreciated, please use -mmemparm"));
+      /* Fall through.  */
     case OPTION_MEMPARM:         /* push args */
       tic4x_reg_args = 0;
       break;
 
     case 'r':
       as_warn (_("Option -r is depreciated, please use -mregparm"));
+      /* Fall through.  */
     case OPTION_REGPARM:        /* register args */
       tic4x_reg_args = 1;
       break;
 
     case 's':
       as_warn (_("Option -s is depreciated, please use -msmall"));
+      /* Fall through.  */
     case OPTION_SMALL:		/* small model */
       tic4x_big_model = 0;
       break;
diff --git a/gas/config/tc-vax.c b/gas/config/tc-vax.c
index b85b5bb..e358c84 100644
--- a/gas/config/tc-vax.c
+++ b/gas/config/tc-vax.c
@@ -1796,8 +1796,10 @@ vip_op (char *optext, struct vop *vopP)
 	{
 	case 'l':
 	  mode += 2;
+	  /* Fall through.  */
 	case 'w':
 	  mode += 2;
+	  /* Fall through.  */
 	case ' ':	/* Assumed B^ until our caller changes it.  */
 	case 'b':
 	  break;
diff --git a/gas/config/tc-visium.c b/gas/config/tc-visium.c
index 05e1616..5b1d255 100644
--- a/gas/config/tc-visium.c
+++ b/gas/config/tc-visium.c
@@ -1520,8 +1520,7 @@ md_assemble (char *str0)
 	  return;
 	}
       this_dest = r1;
-
-      /* fall through...  */
+      /* Fall through.  */
 
     case mode_i:
       /* MOVIL/WRTL traditionally get an implicit "%l" applied
diff --git a/gas/config/tc-xstormy16.c b/gas/config/tc-xstormy16.c
index 887160d..ca6793e 100644
--- a/gas/config/tc-xstormy16.c
+++ b/gas/config/tc-xstormy16.c
@@ -382,6 +382,7 @@ md_cgen_lookup_reloc (const CGEN_INSN *    insn ATTRIBUTE_UNUSED,
 
     case XSTORMY16_OPERAND_REL8_4:
       fixP->fx_addnumber -= 2;
+      /* Fall through.  */
     case XSTORMY16_OPERAND_REL8_2:
       fixP->fx_addnumber -= 2;
       fixP->fx_pcrel = 1;
@@ -389,7 +390,7 @@ md_cgen_lookup_reloc (const CGEN_INSN *    insn ATTRIBUTE_UNUSED,
 
     case XSTORMY16_OPERAND_REL12:
       fixP->fx_where += 2;
-      /* Fall through...  */
+      /* Fall through.  */
     case XSTORMY16_OPERAND_REL12A:
       fixP->fx_addnumber -= 2;
       fixP->fx_pcrel = 1;
diff --git a/gas/config/tc-z80.c b/gas/config/tc-z80.c
index dcc74f6..b7e075a 100644
--- a/gas/config/tc-z80.c
+++ b/gas/config/tc-z80.c
@@ -317,6 +317,7 @@ z80_start_line_hook (void)
 	      *p++ = buf[2];
 	      break;
 	    }
+	  /* Fall through.  */
 	case '"':
 	  for (quote = *p++; quote != *p && '\n' != *p; ++p)
 	    /* No escapes.  */ ;
@@ -874,6 +875,7 @@ emit_mr (char prefix, char opcode, const char *args)
 	    }
 	  check_mach (INS_UNPORT);
 	}
+      /* Fall through.  */
     case O_register:
       emit_mx (prefix, opcode, 0, & arg_m);
       break;
@@ -1776,6 +1778,7 @@ emit_mulub (char prefix ATTRIBUTE_UNUSED, char opcode, const char * args)
 	      *q = opcode + ((reg - 'b') << 3);
 	      break;
 	    }
+	  /* Fall through.  */
 	default:
 	  ill_op ();
 	}
diff --git a/gas/config/tc-z8k.c b/gas/config/tc-z8k.c
index 9b6ee38..5be09fd 100644
--- a/gas/config/tc-z8k.c
+++ b/gas/config/tc-z8k.c
@@ -1000,11 +1000,14 @@ apply_fix (char *ptr, bfd_reloc_code_real_type type, expressionS *operand,
       *ptr++ = n >> 24;
       *ptr++ = n >> 20;
       *ptr++ = n >> 16;
+      /* Fall through.  */
     case 4:			/* 4 nibbles == 16 bits.  */
       *ptr++ = n >> 12;
       *ptr++ = n >> 8;
+      /* Fall through.  */
     case 2:
       *ptr++ = n >> 4;
+      /* Fall through.  */
     case 1:
       *ptr++ = n >> 0;
       break;
@@ -1152,7 +1155,7 @@ build_bytes (opcode_entry_type *this_try, struct z8k_op *operand ATTRIBUTE_UNUSE
               /*case ARG_IMMNMINUS1: not used.  */
 	      case ARG_IMM4M1:
 		imm_operand->X_add_number--;
-                /* Drop through.  */
+                /* Fall through.  */
 	      case ARG_IMM4:
                 if (imm_operand->X_add_number > 15)
 		  as_bad (_("immediate value out of range"));
@@ -1160,7 +1163,7 @@ build_bytes (opcode_entry_type *this_try, struct z8k_op *operand ATTRIBUTE_UNUSE
 		break;
 	      case ARG_NIM8:
 		imm_operand->X_add_number = -imm_operand->X_add_number;
-                /* Drop through.  */
+                /* Fall through.  */
 	      case ARG_IMM8:
 		output_ptr = apply_fix (output_ptr, BFD_RELOC_8, imm_operand, 2);
 		break;
diff --git a/gas/depend.c b/gas/depend.c
index 7203e59..8b57a67 100644
--- a/gas/depend.c
+++ b/gas/depend.c
@@ -121,8 +121,8 @@ quote_string_for_make (FILE *file, const char *src)
 	  if (file)
 	    putc (c, file);
 	  i++;
-	  /* Fall through.  This can mishandle things like "$(" but
-	     there's no easy fix.  */
+	  /* Fall through.  */
+	  /* This can mishandle things like "$(" but there's no easy fix.  */
 	default:
 	ordinary_char:
 	  /* This can mishandle characters in the string "\0\n%*?[\\~";
diff --git a/gas/dw2gencfi.c b/gas/dw2gencfi.c
index 4fbdf42..7294f17 100644
--- a/gas/dw2gencfi.c
+++ b/gas/dw2gencfi.c
@@ -1177,6 +1177,7 @@ dot_cfi_val_encoded_addr (int ignored ATTRIBUTE_UNUSED)
     case O_constant:
       if ((encoding & 0x70) != DW_EH_PE_pcrel)
 	break;
+      /* Fall through.  */
     default:
       encoding = DW_EH_PE_omit;
       break;
diff --git a/gas/expr.c b/gas/expr.c
index b1cdb38..b9983d8 100644
--- a/gas/expr.c
+++ b/gas/expr.c
@@ -1008,6 +1008,7 @@ operand (expressionS *expressionP, enum expr_mode mode)
       /* '~' is permitted to start a label on the Delta.  */
       if (is_name_beginner (c))
 	goto isname;
+      /* Fall through.  */
     case '!':
     case '-':
     case '+':