-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.

binutils/ChangeLog

@@ -1,3 +1,13 @@
+2016-10-06  Alan Modra  <amodra@gmail.com>
+
+	* 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.
+
 2016-10-06  Alan Modra  <amodra@gmail.com>
 
 	* cxxfilt.c (usage): Add ATTRIBUTE_NORETURN.

binutils/dlltool.c

@@ -2708,7 +2708,8 @@ make_one_lib_file (export_type *exp, int i, int delay)
 	      sec->orelocation = rpp;
 	      break;
 	    }
-	  /* else fall through */
+	  /* Fall through.  */
+
 	case IDATA4:
 	  /* An idata$4 or idata$5 is one word long, and has an
 	     rva to idata$6.  */

binutils/dwarf.c

@@ -1824,6 +1824,7 @@ read_and_display_attr_value (unsigned long attribute,
 	{
 	case DW_AT_frame_base:
 	  have_frame_base = 1;
+	  /* Fall through.  */
 	case DW_AT_location:
 	case DW_AT_string_length:
 	case DW_AT_return_addr:
@@ -2099,6 +2100,7 @@ read_and_display_attr_value (unsigned long attribute,
 
     case DW_AT_frame_base:
       have_frame_base = 1;
+      /* Fall through.  */
     case DW_AT_location:
     case DW_AT_string_length:
     case DW_AT_return_addr:
@@ -7654,6 +7656,7 @@ dwarf_select_sections_by_letters (const char *letters)
 
       case 'F':
 	do_debug_frames_interp = 1;
+	/* Fall through.  */
       case 'f':
 	do_debug_frames = 1;
 	break;

binutils/elfcomm.c

@@ -165,6 +165,7 @@ byte_get_little_endian (unsigned char *field, int size)
 	  |    (((unsigned long) (field[1])) << 8)
 	  |    (((unsigned long) (field[2])) << 16)
 	  |    (((unsigned long) (field[3])) << 24);
+      /* Fall through.  */
 
     case 6:
       if (sizeof (elf_vma) == 8)
@@ -182,6 +183,7 @@ byte_get_little_endian (unsigned char *field, int size)
 	  |    (((unsigned long) (field[1])) << 8)
 	  |    (((unsigned long) (field[2])) << 16)
 	  |    (((unsigned long) (field[3])) << 24);
+      /* Fall through.  */
 
     case 7:
       if (sizeof (elf_vma) == 8)
@@ -200,6 +202,7 @@ byte_get_little_endian (unsigned char *field, int size)
 	  |    (((unsigned long) (field[1])) << 8)
 	  |    (((unsigned long) (field[2])) << 16)
 	  |    (((unsigned long) (field[3])) << 24);
+      /* Fall through.  */
 
     case 8:
       if (sizeof (elf_vma) == 8)
@@ -219,6 +222,7 @@ byte_get_little_endian (unsigned char *field, int size)
 	  |    (((unsigned long) (field[1])) << 8)
 	  |    (((unsigned long) (field[2])) << 16)
 	  |    (((unsigned long) (field[3])) << 24);
+      /* Fall through.  */
 
     default:
       error (_("Unhandled data length: %d\n"), size);
@@ -265,6 +269,7 @@ byte_get_big_endian (unsigned char *field, int size)
 	    |   (((unsigned long) (field[1])) << 16)
 	    |   (((unsigned long) (field[0])) << 24);
 	}
+      /* Fall through.  */
 
     case 6:
       if (sizeof (elf_vma) == 8)
@@ -284,6 +289,7 @@ byte_get_big_endian (unsigned char *field, int size)
 	    |   (((unsigned long) (field[1])) << 16)
 	    |   (((unsigned long) (field[0])) << 24);
 	}
+      /* Fall through.  */
 
     case 7:
       if (sizeof (elf_vma) == 8)
@@ -304,6 +310,7 @@ byte_get_big_endian (unsigned char *field, int size)
 	    |   (((unsigned long) (field[1])) << 16)
 	    |   (((unsigned long) (field[0])) << 24);
 	}
+      /* Fall through.  */
 
     case 8:
       if (sizeof (elf_vma) == 8)
@@ -325,6 +332,7 @@ byte_get_big_endian (unsigned char *field, int size)
 	    |   (((unsigned long) (field[1])) << 16)
 	    |   (((unsigned long) (field[0])) << 24);
 	}
+      /* Fall through.  */
 
     default:
       error (_("Unhandled data length: %d\n"), size);

binutils/objcopy.c

@@ -4302,7 +4302,7 @@ copy_main (int argc, char *argv[])
 	      {
 	      case OPTION_CHANGE_SECTION_ADDRESS:
 		p->vma_val = val;
-		/* Drop through.  */
+		/* Fall through.  */
 
 	      case OPTION_CHANGE_SECTION_LMA:
 		p->lma_val = val;

binutils/readelf.c

@@ -426,7 +426,7 @@ print_vma (bfd_vma vma, print_mode mode)
     {
     case FULL_HEX:
       nc = printf ("0x");
-      /* Drop through.  */
+      /* Fall through.  */
 
     case LONG_HEX:
 #ifdef BFD64
@@ -439,11 +439,11 @@ print_vma (bfd_vma vma, print_mode mode)
     case DEC_5:
       if (vma <= 99999)
 	return printf ("%5" BFD_VMA_FMT "d", vma);
-      /* Drop through.  */
+      /* Fall through.  */
 
     case PREFIX_HEX:
       nc = printf ("0x");
-      /* Drop through.  */
+      /* Fall through.  */
 
     case HEX:
       return nc + printf ("%" BFD_VMA_FMT "x", vma);
@@ -1292,6 +1292,7 @@ dump_relocations (FILE * file,
 	      rtype = elf_msp430x_reloc_type (type);
 	      break;
 	    }
+	  /* Fall through.  */
 	case EM_MSP430_OLD:
 	  rtype = elf_msp430_reloc_type (type);
 	  break;
@@ -4450,7 +4451,7 @@ parse_args (int argc, char ** argv)
 	default:
 	  /* xgettext:c-format */
 	  error (_("Invalid option '-%c'\n"), c);
-	  /* Drop through.  */
+	  /* Fall through.  */
 	case '?':
 	  usage (stderr);
 	}
@@ -9679,6 +9680,7 @@ process_dynamic_section (FILE * file)
 	case DT_SYMENT	:
 	case DT_RELENT	:
 	  dynamic_info[entry->d_tag] = entry->d_un.d_val;
+	  /* Fall through.  */
 	case DT_PLTPADSZ:
 	case DT_MOVEENT	:
 	case DT_MOVESZ	:
@@ -11494,6 +11496,7 @@ target_specific_reloc_handling (Elf_Internal_Rela * reloc,
 	  case 10: /* R_MSP430_SYM_DIFF */
 	    if (uses_msp430x_relocs ())
 	      break;
+	    /* Fall through.  */
 	  case 21: /* R_MSP430X_SYM_DIFF */
 	    saved_sym = symtab + get_reloc_symindex (reloc->r_info);
 	    return TRUE;
@@ -12011,6 +12014,7 @@ is_16bit_abs_reloc (unsigned int reloc_type)
     case EM_MSP430:
       if (uses_msp430x_relocs ())
 	return reloc_type == 2; /* R_MSP430_ABS16.  */
+      /* Fall through.  */
     case EM_MSP430_OLD:
       return reloc_type == 5; /* R_MSP430_16_BYTE.  */
     case EM_NDS32:
@@ -14241,6 +14245,7 @@ process_attributes (FILE * file,
 		      goto do_numlist;
 		    case 3:
 		      printf (_("Symbol Attributes:"));
+		      /* Fall through.  */
 		    do_numlist:
 		      for (;;)
 			{
@@ -16418,8 +16423,8 @@ get_file_header (FILE * file)
   /* Determine how to read the rest of the header.  */
   switch (elf_header.e_ident[EI_DATA])
     {
-    default: /* fall through */
-    case ELFDATANONE: /* fall through */
+    default:
+    case ELFDATANONE:
     case ELFDATA2LSB:
       byte_get = byte_get_little_endian;
       byte_put = byte_put_little_endian;

binutils/sysinfo.y

@@ -153,9 +153,8 @@ it:
     break;
   case 'g':
     printf("\tchecksum(ffile,raw, idx, IT_%s_CODE);\n", it);
-
+    /* Fall through.  */
   case 'i':
-
   case 'o':
   case 'c':
     printf("}\n");
@@ -182,6 +181,7 @@ repeat_it_field: '(' REPEAT NAME
 	      printf("\tprintf(\"repeat %%d\\n\", %s);\n",$3);
 	      if (rdepth==2)
 	      printf("\tprintf(\"repeat %%d\\n\", %s[n]);\n",$3);
+	      /* Fall through.  */
 	    case 'i':
 	    case 'g':
 	    case 'o':