[GOLD] -Wimplicit-fallthrough warning fixes

	* aarch64.cc: Spell fall through comments as "// Fall through.".
	* arm.cc: Likewise.
	* mips.cc: Likewise.
	* powerpc.cc: Likewise.
	* s390.cc: Likewise.
	* sparc.cc: Likewise.
	* x86_64.cc: Likewise.
	* powerpc.cc (Target_powerpc::Relocate::relocate): Add missing
	fall through comments.
	* sparc.cc: (Target_sparc::Scan::global): Likewise.
	(Target_sparc::Relocate::relocate): Likewise.
	* tilegx.cc (Target_tilegx::Relocate::relocate): Likewise.
	* resolve.cc (symbol_to_bits): Add missing break.

10 files changed, 47 insertions, 18 deletions

diff --git a/gold/ChangeLog b/gold/ChangeLog
index 1e01a4a247b..8b917b5c2b7 100644
--- a/gold/ChangeLog
+++ b/gold/ChangeLog
@@ -1,3 +1,19 @@
+2016-10-06  Alan Modra  <amodra@gmail.com>
+
+	* aarch64.cc: Spell fall through comments as "// Fall through.".
+	* arm.cc: Likewise.
+	* mips.cc: Likewise.
+	* powerpc.cc: Likewise.
+	* s390.cc: Likewise.
+	* sparc.cc: Likewise.
+	* x86_64.cc: Likewise.
+	* powerpc.cc (Target_powerpc::Relocate::relocate): Add missing
+	fall through comments.
+	* sparc.cc: (Target_sparc::Scan::global): Likewise.
+	(Target_sparc::Relocate::relocate): Likewise.
+	* tilegx.cc (Target_tilegx::Relocate::relocate): Likewise.
+	* resolve.cc (symbol_to_bits): Add missing break.
+
 2016-09-26  Cary Coutant  <ccoutant@gmail.com>
 
 	PR gold/20238
diff --git a/gold/aarch64.cc b/gold/aarch64.cc
index 310331c7f84..28e4d48514c 100644
--- a/gold/aarch64.cc
+++ b/gold/aarch64.cc
@@ -7084,13 +7084,13 @@ Target_aarch64<size, big_endian>::Relocate::relocate(
 	  // Return false to stop further processing this reloc.
 	  return false;
 	}
-      // Fallthrough
+      // Fall through.
     case elfcpp::R_AARCH64_JUMP26:
       if (Reloc::maybe_apply_stub(r_type, relinfo, rela, view, address,
 				  gsym, psymval, object,
 				  target->stub_group_size_))
 	break;
-      // Fallthrough
+      // Fall through.
     case elfcpp::R_AARCH64_TSTBR14:
     case elfcpp::R_AARCH64_CONDBR19:
       reloc_status = Reloc::template pcrela_general<32>(
diff --git a/gold/arm.cc b/gold/arm.cc
index 9171d0b4708..b51612cada5 100644
--- a/gold/arm.cc
+++ b/gold/arm.cc
@@ -12820,7 +12820,7 @@ Target_arm<big_endian>::apply_cortex_a8_workaround(
       // branch to the stub.  We use the THUMB-2 encoding here.
       upper_insn = 0xf000U;
       lower_insn = 0xb800U;
-      // Fall through
+      // Fall through.
     case arm_stub_a8_veneer_b:
     case arm_stub_a8_veneer_bl:
     case arm_stub_a8_veneer_blx:
diff --git a/gold/mips.cc b/gold/mips.cc
index 8893e315dd5..61b351381b7 100644
--- a/gold/mips.cc
+++ b/gold/mips.cc
@@ -10673,8 +10673,7 @@ Target_mips<size, big_endian>::Scan::local(
           // no symbol (e.g. part of a compound relocation).
           if (r_sym == 0)
             break;
-
-          // FALLTHROUGH
+	  // Fall through.
 
         case elfcpp::R_MIPS16_26:
         case elfcpp::R_MIPS_26:
@@ -10903,7 +10902,6 @@ Target_mips<size, big_endian>::Scan::global(
       // Most static relocations require pointer equality, except
       // for branches.
       mips_sym->set_pointer_equality_needed();
-
       // Fall through.
 
     case elfcpp::R_MIPS_26:
@@ -11183,8 +11181,7 @@ Target_mips<size, big_endian>::Scan::global(
           // and has a special meaning.
           if (!mips_obj->is_newabi() && strcmp(gsym->name(), "_gp_disp") == 0)
             break;
-
-          // FALLTHROUGH
+	  // Fall through.
 
         case elfcpp::R_MIPS16_26:
         case elfcpp::R_MIPS_26:
diff --git a/gold/powerpc.cc b/gold/powerpc.cc
index 8f5d259927d..d286f70bc00 100644
--- a/gold/powerpc.cc
+++ b/gold/powerpc.cc
@@ -6092,7 +6092,7 @@ Target_powerpc<size, big_endian>::Scan::global(
 	  ppc_object->set_opd_discard(reloc.get_r_offset());
 	  break;
 	}
-      // Fall thru
+      // Fall through.
     case elfcpp::R_PPC64_UADDR64:
     case elfcpp::R_POWERPC_ADDR32:
     case elfcpp::R_POWERPC_UADDR32:
@@ -6199,7 +6199,7 @@ Target_powerpc<size, big_endian>::Scan::global(
 		      || gsym->is_preemptible())))
 	    target->make_plt_entry(symtab, layout, gsym);
 	}
-      // Fall thru
+      // Fall through.
 
     case elfcpp::R_PPC64_REL64:
     case elfcpp::R_POWERPC_REL32:
@@ -7589,6 +7589,7 @@ Target_powerpc<size, big_endian>::Relocate::relocate(
       if (size != 64)
 	// R_PPC_TLSGD, R_PPC_TLSLD, R_PPC_EMB_RELST_LO, R_PPC_EMB_RELST_HI
 	break;
+      // Fall through.
     case elfcpp::R_POWERPC_TPREL16:
     case elfcpp::R_POWERPC_TPREL16_LO:
     case elfcpp::R_POWERPC_TPREL16_HI:
@@ -7612,6 +7613,7 @@ Target_powerpc<size, big_endian>::Relocate::relocate(
 	// R_PPC_EMB_NADDR32, R_PPC_EMB_NADDR16, R_PPC_EMB_NADDR16_LO
 	// R_PPC_EMB_NADDR16_HI, R_PPC_EMB_NADDR16_HA, R_PPC_EMB_SDAI16
 	break;
+      // Fall through.
     case elfcpp::R_POWERPC_DTPREL16:
     case elfcpp::R_POWERPC_DTPREL16_LO:
     case elfcpp::R_POWERPC_DTPREL16_HI:
@@ -7640,6 +7642,7 @@ Target_powerpc<size, big_endian>::Relocate::relocate(
     case elfcpp::R_POWERPC_ADDR14_BRTAKEN:
     case elfcpp::R_POWERPC_REL14_BRTAKEN:
       branch_bit = 1 << 21;
+      // Fall through.
     case elfcpp::R_POWERPC_ADDR14_BRNTAKEN:
     case elfcpp::R_POWERPC_REL14_BRNTAKEN:
       {
@@ -8038,6 +8041,7 @@ Target_powerpc<size, big_endian>::Relocate::relocate(
       if (size == 32)
 	// R_PPC_EMB_MRKREF, R_PPC_EMB_RELST_LO, R_PPC_EMB_RELST_HA
 	goto unsupp;
+      // Fall through.
     case elfcpp::R_POWERPC_ADDR16_HI:
     case elfcpp::R_POWERPC_REL16_HI:
     case elfcpp::R_PPC64_TOC16_HI:
@@ -8058,6 +8062,7 @@ Target_powerpc<size, big_endian>::Relocate::relocate(
       if (size == 32)
 	// R_PPC_EMB_RELSEC16, R_PPC_EMB_RELST_HI, R_PPC_EMB_BIT_FLD
 	goto unsupp;
+      // Fall through.
     case elfcpp::R_POWERPC_ADDR16_HA:
     case elfcpp::R_POWERPC_REL16_HA:
     case elfcpp::R_PPC64_TOC16_HA:
@@ -8080,6 +8085,7 @@ Target_powerpc<size, big_endian>::Relocate::relocate(
       if (size == 32)
 	// R_PPC_EMB_NADDR16_LO
 	goto unsupp;
+      // Fall through.
     case elfcpp::R_PPC64_ADDR16_HIGHER:
     case elfcpp::R_PPC64_TPREL16_HIGHER:
       Reloc::addr16_hi2(view, value);
@@ -8089,6 +8095,7 @@ Target_powerpc<size, big_endian>::Relocate::relocate(
       if (size == 32)
 	// R_PPC_EMB_NADDR16_HI
 	goto unsupp;
+      // Fall through.
     case elfcpp::R_PPC64_ADDR16_HIGHERA:
     case elfcpp::R_PPC64_TPREL16_HIGHERA:
       Reloc::addr16_ha2(view, value);
@@ -8098,6 +8105,7 @@ Target_powerpc<size, big_endian>::Relocate::relocate(
       if (size == 32)
 	// R_PPC_EMB_NADDR16_HA
 	goto unsupp;
+      // Fall through.
     case elfcpp::R_PPC64_ADDR16_HIGHEST:
     case elfcpp::R_PPC64_TPREL16_HIGHEST:
       Reloc::addr16_hi3(view, value);
@@ -8107,6 +8115,7 @@ Target_powerpc<size, big_endian>::Relocate::relocate(
       if (size == 32)
 	// R_PPC_EMB_SDAI16
 	goto unsupp;
+      // Fall through.
     case elfcpp::R_PPC64_ADDR16_HIGHESTA:
     case elfcpp::R_PPC64_TPREL16_HIGHESTA:
       Reloc::addr16_ha3(view, value);
@@ -8117,11 +8126,13 @@ Target_powerpc<size, big_endian>::Relocate::relocate(
       if (size == 32)
 	// R_PPC_EMB_NADDR32, R_PPC_EMB_NADDR16
 	goto unsupp;
+      // Fall through.
     case elfcpp::R_PPC64_TPREL16_DS:
     case elfcpp::R_PPC64_TPREL16_LO_DS:
       if (size == 32)
 	// R_PPC_TLSGD, R_PPC_TLSLD
 	break;
+      // Fall through.
     case elfcpp::R_PPC64_ADDR16_DS:
     case elfcpp::R_PPC64_ADDR16_LO_DS:
     case elfcpp::R_PPC64_TOC16_DS:
diff --git a/gold/resolve.cc b/gold/resolve.cc
index 11f322961ab..3213333e995 100644
--- a/gold/resolve.cc
+++ b/gold/resolve.cc
@@ -193,6 +193,7 @@ symbol_to_bits(elfcpp::STB binding, bool is_dynamic,
       // table.
       gold_error(_("invalid STB_LOCAL symbol in external symbols"));
       bits = global_flag;
+      break;
 
     default:
       // Any target which wants to handle STB_LOOS, etc., needs to
diff --git a/gold/s390.cc b/gold/s390.cc
index c4960182001..9f578e4bd78 100644
--- a/gold/s390.cc
+++ b/gold/s390.cc
@@ -2555,7 +2555,7 @@ Target_s390<size>::Scan::local(Symbol_table* symtab,
 		    unsupported_reloc_local(object, r_type);
 		  }
 	      }
-	    // fall through
+	    // Fall through.
 	  case elfcpp::R_390_TLS_IEENT:
 	  case elfcpp::R_390_TLS_GOTIE12:
 	  case elfcpp::R_390_TLS_GOTIE20:
@@ -2993,7 +2993,7 @@ Target_s390<size>::Scan::global(Symbol_table* symtab,
 		    unsupported_reloc_global(object, r_type, gsym);
 		  }
 	      }
-	    // fall through
+	    // Fall through.
 	  case elfcpp::R_390_TLS_IEENT:
 	  case elfcpp::R_390_TLS_GOTIE12:
 	  case elfcpp::R_390_TLS_GOTIE20:
@@ -3241,7 +3241,7 @@ Target_s390<size>::Relocate::relocate(
 		  || (gsym->is_defined()
 		      && !gsym->is_from_dynobj()
 		      && !gsym->is_preemptible()));
-      // fallthru
+      // Fall through.
     case elfcpp::R_390_8:
     case elfcpp::R_390_12:
     case elfcpp::R_390_16:
@@ -3270,7 +3270,7 @@ Target_s390<size>::Relocate::relocate(
       gold_assert(gsym == NULL
 		  || gsym->has_plt_offset()
 		  || gsym->final_value_is_known());
-      // fallthru
+      // Fall through.
     case elfcpp::R_390_GOTOFF64:
     case elfcpp::R_390_GOTOFF32:
     case elfcpp::R_390_GOTOFF16:
diff --git a/gold/sparc.cc b/gold/sparc.cc
index 8e66b7772a8..eb8b40ca917 100644
--- a/gold/sparc.cc
+++ b/gold/sparc.cc
@@ -2305,7 +2305,7 @@ Target_sparc<size, big_endian>::Scan::local(
 				       reloc.get_r_addend(), is_ifunc);
 	  break;
 	}
-      /* Fall through.  */
+      // Fall through.
 
     case elfcpp::R_SPARC_HIX22:
     case elfcpp::R_SPARC_LOX10:
@@ -2815,6 +2815,7 @@ Target_sparc<size, big_endian>::Scan::global(
 	  // and code transform the GOT load into an addition.
 	  break;
 	}
+      // Fall through.
     case elfcpp::R_SPARC_GOT10:
     case elfcpp::R_SPARC_GOT13:
     case elfcpp::R_SPARC_GOT22:
@@ -3354,6 +3355,7 @@ Target_sparc<size, big_endian>::Relocate::relocate(
 	  gdop_valid = true;
 	  break;
 	}
+      // Fall through.
     case elfcpp::R_SPARC_GOT10:
     case elfcpp::R_SPARC_GOT13:
     case elfcpp::R_SPARC_GOT22:
@@ -3475,7 +3477,7 @@ Target_sparc<size, big_endian>::Relocate::relocate(
 	  Reloc::gdop_lox10(view, got_offset);
 	  break;
 	}
-      /* Fall through.  */
+      // Fall through.
     case elfcpp::R_SPARC_GOT10:
       Reloc::lo10(view, got_offset, addend);
       break;
@@ -3504,7 +3506,7 @@ Target_sparc<size, big_endian>::Relocate::relocate(
 	  Reloc::gdop_hix22(view, got_offset);
 	  break;
 	}
-      /* Fall through.  */
+      // Fall through.
     case elfcpp::R_SPARC_GOT22:
       Reloc::hi22(view, got_offset, addend);
       break;
diff --git a/gold/tilegx.cc b/gold/tilegx.cc
index bb1733025fb..ee262d147e2 100644
--- a/gold/tilegx.cc
+++ b/gold/tilegx.cc
@@ -4428,6 +4428,7 @@ Target_tilegx<size, big_endian>::Relocate::relocate(
       psymval = &symval;
       always_apply_relocation = true;
       addend = 0;
+      // Fall through.
 
     // when under PIC mode, these relocations are deferred to rtld
     case elfcpp::R_TILEGX_IMM16_X0_HW0:
@@ -4618,6 +4619,7 @@ Target_tilegx<size, big_endian>::Relocate::relocate(
                 got_type = GOT_TYPE_TLS_OFFSET;
                 have_got_offset = true;
               }
+	      // Fall through.
             do_update_value:
               if (have_got_offset) {
                 if (gsym != NULL) {
diff --git a/gold/x86_64.cc b/gold/x86_64.cc
index 8d494ea1755..9004aec15d9 100644
--- a/gold/x86_64.cc
+++ b/gold/x86_64.cc
@@ -2361,7 +2361,7 @@ Target_x86_64<size>::Scan::check_non_pic(Relobj* object, unsigned int r_type,
 	      && !gsym->is_undefined()
 	      && !gsym->is_preemptible()))
 	return;
-      /* Fall through.  */
+      // Fall through.
     case elfcpp::R_X86_64_32:
       // R_X86_64_32 is OK for x32.
       if (size == 32 && r_type == elfcpp::R_X86_64_32)