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Re: Implement -Wswitch-fallthrough: testsuite


2016-07-11  Marek Polacek  <polacek@redhat.com>

	PR c/7652
	* c-c++-common/Wswitch-unreachable-1.c: Add __builtin_fallthrough.
	* c-c++-common/pr44832.c: Likewise.
	* g++.dg/lto/20090128_0.C: Likewise.
	* g++.dg/opt/pr14029.C: Likewise.
	* g++.dg/opt/pr45412.C: Likewise.
	* g++.dg/opt/pr56999.C: Likewise.
	* g++.dg/pr48484.C: Likewise.
	* g++.dg/pr57662.C: Likewise.
	* g++.dg/torture/pr64565.C: Likewise.
	* gcc.dg/pr20017.c: Likewise.
	* gcc.dg/pr27531-1.c: Likewise.
	* gcc.dg/switch-1.c: Likewise.
	* gcc.dg/torture/pr64284.c: Likewise.
	* c-c++-common/Wmisleading-indentation-2.c: Use -Wno-switch-fallthrough.
	* g++.dg/opt/eh5.C: Likewise.
	* g++.dg/torture/pr49615.C: Likewise.
	* g++.dg/warn/sequence-pt-pr17880.C: Likewise.
	* gcc.dg/sequence-pt-pr17880.c: Likewise.
	* gcc.dg/Wjump-misses-init-2.c: Likewise.
	* gcc.dg/c99-vla-jump-5.c: Likewise.
	* gcc.dg/duff-1.c: Likewise.
	* gcc.dg/duff-2.c: Likewise.
	* gcc.dg/duff-3.c: Likewise.
	* gcc.dg/duff-4.c: Likewise.
	* gcc.dg/ipa/pr57539.c: Likewise.
	* gcc.dg/noncompile/920923-1.c: Likewise.
	* gcc.dg/pr42388.c: Likewise.
	* gcc.dg/pr45055.c: Likewise.
	* gcc.dg/pr52139.c: Likewise.
	* gcc.dg/pr53881-2.c: Likewise.
	* gcc.dg/pr53887.c: Likewise.
	* gcc.dg/pr55150-2.c: Likewise.
	* gcc.dg/pr59418.c: Likewise.
	* gcc.dg/pr65658.c: Likewise.
	* gcc.dg/pr71084.c: Likewise.
	* gcc.dg/torture/pr38948.c: Likewise.
	* gcc.dg/tree-ssa/20030814-2.c: Likewise.
	* gcc.dg/tree-ssa/20030814-3.c: Likewise.
	* gcc.dg/tree-ssa/inline-10.c: Likewise.
	* gcc.dg/tree-ssa/ssa-dom-thread-9.c: Likewise.
	* gcc.dg/tree-ssa/ssa-fre-10.c: Likewise.
	* gcc.target/aarch64/pic-symrefplus.c: Likewise.
	* gcc.target/i386/avx2-vperm2i128-2.c: Likewise.
	* gcc.target/i386/pr46939.c: Likewise.

diff --git gcc/gcc/testsuite/c-c++-common/Wmisleading-indentation-2.c gcc/gcc/testsuite/c-c++-common/Wmisleading-indentation-2.c
index b4ee700..b00ccc2 100644
--- gcc/gcc/testsuite/c-c++-common/Wmisleading-indentation-2.c
+++ gcc/gcc/testsuite/c-c++-common/Wmisleading-indentation-2.c
@@ -1,4 +1,4 @@
-/* { dg-options "-Wmisleading-indentation" } */
+/* { dg-options "-Wmisleading-indentation -Wno-switch-fallthrough" } */
 /* { dg-do compile } */
 
 /* Based on get_attr_athlon_decode from the generated insn-attrtab.c
diff --git gcc/gcc/testsuite/c-c++-common/Wswitch-unreachable-1.c gcc/gcc/testsuite/c-c++-common/Wswitch-unreachable-1.c
index ee6ecc1..26e085d 100644
--- gcc/gcc/testsuite/c-c++-common/Wswitch-unreachable-1.c
+++ gcc/gcc/testsuite/c-c++-common/Wswitch-unreachable-1.c
@@ -108,6 +108,7 @@ X:
     {
 L:
       j = 16;
+      __builtin_fallthrough ();
       default:
 	if (j < 5)
 	  goto L;
diff --git gcc/gcc/testsuite/c-c++-common/pr44832.c gcc/gcc/testsuite/c-c++-common/pr44832.c
index b57e525..a8d0b4d 100644
--- gcc/gcc/testsuite/c-c++-common/pr44832.c
+++ gcc/gcc/testsuite/c-c++-common/pr44832.c
@@ -93,6 +93,7 @@ half:
     case V16QImode:
       if (!((ix86_isa_flags & (1 << 19)) != 0))
  break;
+      __builtin_fallthrough ();
 
     case V8HImode:
       if (!((ix86_isa_flags & (1 << 17)) != 0))
diff --git gcc/gcc/testsuite/g++.dg/lto/20090128_0.C gcc/gcc/testsuite/g++.dg/lto/20090128_0.C
index d03cfc6..c639d92 100644
--- gcc/gcc/testsuite/g++.dg/lto/20090128_0.C
+++ gcc/gcc/testsuite/g++.dg/lto/20090128_0.C
@@ -79,6 +79,7 @@ Class1::f3 (const char *src, char *dst, const char *end)
 	{
 	case KXYYZ:
 	  *dst = '\0';
+	  __builtin_fallthrough ();
 	case KXFI9:
  	  if (!f2 (p9t42, &src, &dst, end))
 	    ;
diff --git gcc/gcc/testsuite/g++.dg/opt/eh5.C gcc/gcc/testsuite/g++.dg/opt/eh5.C
index 3557ab2..92580ac 100644
--- gcc/gcc/testsuite/g++.dg/opt/eh5.C
+++ gcc/gcc/testsuite/g++.dg/opt/eh5.C
@@ -1,6 +1,6 @@
 // PR 41377
 // { dg-do compile }
-// { dg-options "-O3" }
+// { dg-options "-O3 -Wno-switch-fallthrough" }
 
 struct A
 {
diff --git gcc/gcc/testsuite/g++.dg/opt/pr14029.C gcc/gcc/testsuite/g++.dg/opt/pr14029.C
index 1673edf..5a67b17 100644
--- gcc/gcc/testsuite/g++.dg/opt/pr14029.C
+++ gcc/gcc/testsuite/g++.dg/opt/pr14029.C
@@ -28,6 +28,7 @@ Iterator find_7(Iterator first, Iterator last)
     case 1:
           if (*first.ptr == 7) return first;
           ++first;
+    __builtin_fallthrough ();
     case 0:
     default:
           return last;
diff --git gcc/gcc/testsuite/g++.dg/opt/pr45412.C gcc/gcc/testsuite/g++.dg/opt/pr45412.C
index e374f52..4259c7c 100644
--- gcc/gcc/testsuite/g++.dg/opt/pr45412.C
+++ gcc/gcc/testsuite/g++.dg/opt/pr45412.C
@@ -18,6 +18,7 @@ S::vm ()
     {
       case 0:
 	  bar ();
+	  __builtin_fallthrough ();
       case 1:
 	  delete this;
     }
diff --git gcc/gcc/testsuite/g++.dg/opt/pr56999.C gcc/gcc/testsuite/g++.dg/opt/pr56999.C
index 8d89ffa..6c48a72 100644
--- gcc/gcc/testsuite/g++.dg/opt/pr56999.C
+++ gcc/gcc/testsuite/g++.dg/opt/pr56999.C
@@ -131,6 +131,7 @@ namespace js
 	    JITScript *jit = script->getJIT (constructing, barriers);
 	    if (!jit)
 	      return false;
+	    __builtin_fallthrough ();
 	  }
 	case ParallelIon:
 	  return true;
diff --git gcc/gcc/testsuite/g++.dg/pr48484.C gcc/gcc/testsuite/g++.dg/pr48484.C
index 1380c45..f8595da 100644
--- gcc/gcc/testsuite/g++.dg/pr48484.C
+++ gcc/gcc/testsuite/g++.dg/pr48484.C
@@ -96,6 +96,7 @@ bool
 	       _stack._vals[_i_._arg2], _i_._arg2, _i_._arg1, tojump);
 
 	    ci += tojump;  /* { dg-warning "uninitialized" "warning" }  */
+	    __builtin_fallthrough ();
 	  }
 	case 1:
 	  _stack.fff (_i_._arg1);
diff --git gcc/gcc/testsuite/g++.dg/pr57662.C gcc/gcc/testsuite/g++.dg/pr57662.C
index bd5793d..0c77b65 100644
--- gcc/gcc/testsuite/g++.dg/pr57662.C
+++ gcc/gcc/testsuite/g++.dg/pr57662.C
@@ -328,6 +328,7 @@ static bool cp_parser_pragma(cp_parser * parser, enum pragma_context context)
 	switch (id) {
 	case PRAGMA_OMP_DECLARE_REDUCTION:
 		cp_parser_omp_declare(parser, pragma_tok, context);
+		__builtin_fallthrough ();
 	case PRAGMA_OMP_TARGET:
 		return cp_parser_omp_target(parser, pragma_tok, context);
 	}
diff --git gcc/gcc/testsuite/g++.dg/torture/pr49615.C gcc/gcc/testsuite/g++.dg/torture/pr49615.C
index 98a2f95..2aa641a 100644
--- gcc/gcc/testsuite/g++.dg/torture/pr49615.C
+++ gcc/gcc/testsuite/g++.dg/torture/pr49615.C
@@ -1,5 +1,5 @@
 /* { dg-do compile } */
-/* { dg-options "-g" } */
+/* { dg-options "-g -Wno-switch-fallthrough" } */
 
 template <class T>
 static inline bool Dispatch (T* obj, void (T::*func) ())
diff --git gcc/gcc/testsuite/g++.dg/torture/pr64565.C gcc/gcc/testsuite/g++.dg/torture/pr64565.C
index 42b0239..eeb5f10 100644
--- gcc/gcc/testsuite/g++.dg/torture/pr64565.C
+++ gcc/gcc/testsuite/g++.dg/torture/pr64565.C
@@ -75,6 +75,7 @@ J::m_fn2 ()
         F query = 0;
         if (Refresh_hasDomain)
           return NS_OK;
+	__builtin_fallthrough ();
       }
     case 0:
       {
@@ -82,6 +83,7 @@ J::m_fn2 ()
         F query = Refresh___trans_tmp_5.m_fn4 (0);
         history.m_fn7 ();
         Refresh___trans_tmp_6.m_fn5 (0);
+	__builtin_fallthrough ();
       }
     case 3:
       m_fn2 ();
diff --git gcc/gcc/testsuite/g++.dg/warn/sequence-pt-pr17880.C gcc/gcc/testsuite/g++.dg/warn/sequence-pt-pr17880.C
index 01d87be..58de858 100644
--- gcc/gcc/testsuite/g++.dg/warn/sequence-pt-pr17880.C
+++ gcc/gcc/testsuite/g++.dg/warn/sequence-pt-pr17880.C
@@ -1,6 +1,6 @@
 // PR 17880
 // { dg-do compile }
-// { dg-options "-Wsequence-point" }
+// { dg-options "-Wsequence-point -Wno-switch-fallthrough" }
 
 int
 foo (int x)
diff --git gcc/gcc/testsuite/gcc.dg/Wjump-misses-init-2.c gcc/gcc/testsuite/gcc.dg/Wjump-misses-init-2.c
index 042c02a..c66e5da 100644
--- gcc/gcc/testsuite/gcc.dg/Wjump-misses-init-2.c
+++ gcc/gcc/testsuite/gcc.dg/Wjump-misses-init-2.c
@@ -1,5 +1,5 @@
 /* { dg-do compile } */
-/* { dg-options "-Wjump-misses-init -std=c99" } */
+/* { dg-options "-Wjump-misses-init -std=c99 -Wno-switch-fallthrough" } */
 extern void f1 ();
 int
 f2 (int a)
diff --git gcc/gcc/testsuite/gcc.dg/c99-vla-jump-5.c gcc/gcc/testsuite/gcc.dg/c99-vla-jump-5.c
index 5b5fc74..9003279 100644
--- gcc/gcc/testsuite/gcc.dg/c99-vla-jump-5.c
+++ gcc/gcc/testsuite/gcc.dg/c99-vla-jump-5.c
@@ -9,7 +9,7 @@
 
 /* Origin: Joseph Myers <joseph@codesourcery.com> */
 /* { dg-do compile } */
-/* { dg-options "-std=iso9899:1999 -pedantic-errors" } */
+/* { dg-options "-std=iso9899:1999 -pedantic-errors -Wno-switch-fallthrough" } */
 
 void
 f (int a, int b)
diff --git gcc/gcc/testsuite/gcc.dg/duff-1.c gcc/gcc/testsuite/gcc.dg/duff-1.c
index b718f6c..3d47576 100644
--- gcc/gcc/testsuite/gcc.dg/duff-1.c
+++ gcc/gcc/testsuite/gcc.dg/duff-1.c
@@ -5,7 +5,7 @@
    Derived from PR 3846.  */
 
 /* { dg-do run } */
-/* { dg-options "-O2" } */
+/* { dg-options "-O2 -Wno-switch-fallthrough" } */
 
 extern void abort (void);
 extern void exit (int);
diff --git gcc/gcc/testsuite/gcc.dg/duff-2.c gcc/gcc/testsuite/gcc.dg/duff-2.c
index 8b8923e..e7287f3 100644
--- gcc/gcc/testsuite/gcc.dg/duff-2.c
+++ gcc/gcc/testsuite/gcc.dg/duff-2.c
@@ -6,7 +6,7 @@
    See also PR 5230.  */
 
 /* { dg-do run } */
-/* { dg-options "-O2" } */
+/* { dg-options "-O2 -Wno-switch-fallthrough" } */
 
 extern void abort (void);
 extern void exit (int);
diff --git gcc/gcc/testsuite/gcc.dg/duff-3.c gcc/gcc/testsuite/gcc.dg/duff-3.c
index 23cddef..53f8990 100644
--- gcc/gcc/testsuite/gcc.dg/duff-3.c
+++ gcc/gcc/testsuite/gcc.dg/duff-3.c
@@ -5,7 +5,7 @@
    Derived from Tom Duff's original usenet message about the device.  */
 
 /* { dg-do run } */
-/* { dg-options "-O2" } */
+/* { dg-options "-O2 -Wno-switch-fallthrough" } */
 
 extern void abort (void);
 extern void exit (int);
diff --git gcc/gcc/testsuite/gcc.dg/duff-4.c gcc/gcc/testsuite/gcc.dg/duff-4.c
index 7032285..a8b2c63 100644
--- gcc/gcc/testsuite/gcc.dg/duff-4.c
+++ gcc/gcc/testsuite/gcc.dg/duff-4.c
@@ -5,7 +5,7 @@
    Derived from duff-2.c.  */
 
 /* { dg-do run } */
-/* { dg-options "-O2" } */
+/* { dg-options "-O2 -Wno-switch-fallthrough" } */
 
 extern void abort (void);
 extern void exit (int);
diff --git gcc/gcc/testsuite/gcc.dg/ipa/pr57539.c gcc/gcc/testsuite/gcc.dg/ipa/pr57539.c
index 514b600..9b5505e 100644
--- gcc/gcc/testsuite/gcc.dg/ipa/pr57539.c
+++ gcc/gcc/testsuite/gcc.dg/ipa/pr57539.c
@@ -1,5 +1,5 @@
 /* { dg-do compile } */
-/* { dg-options "-O3" } */
+/* { dg-options "-O3 -Wno-switch-fallthrough" } */
 
 typedef long unsigned int size_t;
 typedef struct
diff --git gcc/gcc/testsuite/gcc.dg/noncompile/920923-1.c gcc/gcc/testsuite/gcc.dg/noncompile/920923-1.c
index 1cb140e..713918d 100644
--- gcc/gcc/testsuite/gcc.dg/noncompile/920923-1.c
+++ gcc/gcc/testsuite/gcc.dg/noncompile/920923-1.c
@@ -1,3 +1,4 @@
+/* { dg-options "-Wno-switch-fallthrough" } */
 /* { dg-message "undeclared identifier is reported only once" "reminder for mmu_base" { target *-*-* } 0 } */
 typedef BYTE unsigned char;	/* { dg-error "expected" } */
 typedef int item_n;
diff --git gcc/gcc/testsuite/gcc.dg/pr20017.c gcc/gcc/testsuite/gcc.dg/pr20017.c
index 47c048f..f77d7e8 100644
--- gcc/gcc/testsuite/gcc.dg/pr20017.c
+++ gcc/gcc/testsuite/gcc.dg/pr20017.c
@@ -32,6 +32,7 @@ foo (int *buf, int *p)
       result = *p;
 
       /* Fall through.  */
+      __builtin_fallthrough ();
     default:
       if (result)
 	return 1;
diff --git gcc/gcc/testsuite/gcc.dg/pr27531-1.c gcc/gcc/testsuite/gcc.dg/pr27531-1.c
index 990c183..e28f56cc 100644
--- gcc/gcc/testsuite/gcc.dg/pr27531-1.c
+++ gcc/gcc/testsuite/gcc.dg/pr27531-1.c
@@ -41,14 +41,19 @@ int main (int argc, char **argv)
         {
             case 'L':
                 onlylockflag = 1;
+		__builtin_fallthrough ();
             case 'N':
                 shownames = 0;
+		__builtin_fallthrough ();
             case 'R':
                 t = a;
+		__builtin_fallthrough ();
             case 'b':
                 branchflag = 1;
+		__builtin_fallthrough ();
             case 'r':
                 getrevpairs(a);
+		__builtin_fallthrough ();
         }
         if (onlylockflag && !Locks)
             fprintf(out, "%s\n", RCSname);
diff --git gcc/gcc/testsuite/gcc.dg/pr42388.c gcc/gcc/testsuite/gcc.dg/pr42388.c
index a68a2e8..4ac4b0d 100644
--- gcc/gcc/testsuite/gcc.dg/pr42388.c
+++ gcc/gcc/testsuite/gcc.dg/pr42388.c
@@ -1,5 +1,5 @@
 /* { dg-do compile { target powerpc*-*-* ia64-*-* i?86-*-* x86_64-*-* } } */
-/* { dg-options "-O2 -fselective-scheduling -fmodulo-sched" } */
+/* { dg-options "-O2 -fselective-scheduling -fmodulo-sched -Wno-switch-fallthrough" } */
 
 enum rtx_code
 {
diff --git gcc/gcc/testsuite/gcc.dg/pr45055.c gcc/gcc/testsuite/gcc.dg/pr45055.c
index 899de50..36f11e9 100644
--- gcc/gcc/testsuite/gcc.dg/pr45055.c
+++ gcc/gcc/testsuite/gcc.dg/pr45055.c
@@ -1,6 +1,6 @@
 /* PR debug/45055 */
 /* { dg-do compile } */
-/* { dg-options "-O2 -ftracer -fsched-pressure -funroll-loops -fschedule-insns -fcompare-debug" } */
+/* { dg-options "-O2 -ftracer -fsched-pressure -funroll-loops -fschedule-insns -fcompare-debug -Wno-switch-fallthrough" } */
 /* { dg-require-effective-target scheduling } */
 
 int colormap[10];
diff --git gcc/gcc/testsuite/gcc.dg/pr52139.c gcc/gcc/testsuite/gcc.dg/pr52139.c
index b2a08a6..4e691aa 100644
--- gcc/gcc/testsuite/gcc.dg/pr52139.c
+++ gcc/gcc/testsuite/gcc.dg/pr52139.c
@@ -1,6 +1,6 @@
 /* PR rtl-optimization/52139 */
 /* { dg-do compile } */
-/* { dg-options "-O -fno-tree-dominator-opts -fno-tree-fre" } */
+/* { dg-options "-O -fno-tree-dominator-opts -fno-tree-fre -Wno-switch-fallthrough" } */
 /* { dg-additional-options "-fpic" { target fpic } } */
 /* { dg-require-effective-target label_values } */
 
diff --git gcc/gcc/testsuite/gcc.dg/pr53881-2.c gcc/gcc/testsuite/gcc.dg/pr53881-2.c
index f6f8f8b..735580c 100644
--- gcc/gcc/testsuite/gcc.dg/pr53881-2.c
+++ gcc/gcc/testsuite/gcc.dg/pr53881-2.c
@@ -1,5 +1,5 @@
 /* { dg-do compile } */
-/* { dg-options "-O2" } */
+/* { dg-options "-O2 -Wno-switch-fallthrough" } */
 
 int a,b,c;
 void
diff --git gcc/gcc/testsuite/gcc.dg/pr53887.c gcc/gcc/testsuite/gcc.dg/pr53887.c
index b46126c..9a73c4b 100644
--- gcc/gcc/testsuite/gcc.dg/pr53887.c
+++ gcc/gcc/testsuite/gcc.dg/pr53887.c
@@ -1,5 +1,5 @@
 /* { dg-do compile } */
-/* { dg-options "-O2" } */
+/* { dg-options "-O2 -Wno-switch-fallthrough" } */
 
 enum
 { Failed, NoError, NoDiskette }
diff --git gcc/gcc/testsuite/gcc.dg/pr55150-2.c gcc/gcc/testsuite/gcc.dg/pr55150-2.c
index ed571d6..5b05ca1 100644
--- gcc/gcc/testsuite/gcc.dg/pr55150-2.c
+++ gcc/gcc/testsuite/gcc.dg/pr55150-2.c
@@ -1,7 +1,7 @@
 /* PR middle-end/55150 */
 /* { dg-do compile } */
 /* { dg-require-effective-target fpic } */
-/* { dg-options "-Os -g -fPIC" } */
+/* { dg-options "-Os -g -fPIC -Wno-switch-fallthrough" } */
 
 typedef unsigned char DES_cblock[8];
  typedef struct DES_ks {
diff --git gcc/gcc/testsuite/gcc.dg/pr59418.c gcc/gcc/testsuite/gcc.dg/pr59418.c
index 12999aa..57bbf53 100644
--- gcc/gcc/testsuite/gcc.dg/pr59418.c
+++ gcc/gcc/testsuite/gcc.dg/pr59418.c
@@ -2,7 +2,7 @@
 /* Reported by Ryan Mansfield <rmansfield@qnx.com> */
 
 /* { dg-do compile } */
-/* { dg-options "-Os -g" } */
+/* { dg-options "-Os -g -Wno-switch-fallthrough" } */
 /* { dg-options "-march=armv7-a -mfloat-abi=hard -Os -g" { target { arm*-*-* && { ! arm_thumb1 } } } } */
 
 extern int printf (const char *__format, ...);
diff --git gcc/gcc/testsuite/gcc.dg/pr65658.c gcc/gcc/testsuite/gcc.dg/pr65658.c
index bb5c37a..83a2cb1 100644
--- gcc/gcc/testsuite/gcc.dg/pr65658.c
+++ gcc/gcc/testsuite/gcc.dg/pr65658.c
@@ -1,5 +1,5 @@
 /* { dg-do compile } */
-/* { dg-options "-Wuninitialized -O2 -Wno-implicit" } */
+/* { dg-options "-Wuninitialized -O2 -Wno-implicit -Wno-switch-fallthrough" } */
 /* { dg-require-effective-target ptr32plus } */
 
 extern int optind;
diff --git gcc/gcc/testsuite/gcc.dg/pr71084.c gcc/gcc/testsuite/gcc.dg/pr71084.c
index 46fdf9f..0994932 100644
--- gcc/gcc/testsuite/gcc.dg/pr71084.c
+++ gcc/gcc/testsuite/gcc.dg/pr71084.c
@@ -1,6 +1,6 @@
 /* PR tree-optimization/71084 */
 /* { dg-do compile } */
-/* { dg-options "-O2" } */
+/* { dg-options "-O2 -Wno-switch-fallthrough" } */
 
 void babl_format (void);
 void gimp_drawable_get_format (void);
diff --git gcc/gcc/testsuite/gcc.dg/sequence-pt-pr17880.c gcc/gcc/testsuite/gcc.dg/sequence-pt-pr17880.c
index df706e5..c5ed973 100644
--- gcc/gcc/testsuite/gcc.dg/sequence-pt-pr17880.c
+++ gcc/gcc/testsuite/gcc.dg/sequence-pt-pr17880.c
@@ -1,6 +1,6 @@
 /* PR 17880 */
 /* { dg-do compile } */
-/* { dg-options "-Wsequence-point" } */
+/* { dg-options "-Wsequence-point -Wno-switch-fallthrough" } */
 
 int
 foo (int x)
diff --git gcc/gcc/testsuite/gcc.dg/switch-1.c gcc/gcc/testsuite/gcc.dg/switch-1.c
index 1879790..2534f3e 100644
--- gcc/gcc/testsuite/gcc.dg/switch-1.c
+++ gcc/gcc/testsuite/gcc.dg/switch-1.c
@@ -10,6 +10,7 @@ void f (char *s)
 	{
 	case 2:
 	  *s = '2';
+	  __builtin_fallthrough ();
 	case 6: case 4: case 3: case 1:
 	  break;
 	}
diff --git gcc/gcc/testsuite/gcc.dg/torture/pr38948.c gcc/gcc/testsuite/gcc.dg/torture/pr38948.c
index 90906ee..0a3aad6 100644
--- gcc/gcc/testsuite/gcc.dg/torture/pr38948.c
+++ gcc/gcc/testsuite/gcc.dg/torture/pr38948.c
@@ -1,4 +1,4 @@
-/* { dg-options "-fno-tree-sra" } */
+/* { dg-options "-fno-tree-sra -Wno-switch-fallthrough" } */
 /* { dg-options "-fno-tree-sra -march=v32" { target cris-*-* } } */
 typedef unsigned char byte;
 typedef unsigned int uint;
diff --git gcc/gcc/testsuite/gcc.dg/torture/pr64284.c gcc/gcc/testsuite/gcc.dg/torture/pr64284.c
index 4254381..dae08a3 100644
--- gcc/gcc/testsuite/gcc.dg/torture/pr64284.c
+++ gcc/gcc/testsuite/gcc.dg/torture/pr64284.c
@@ -9,6 +9,7 @@ fn1() {
 	switch (*a) {
 	  case '\'':
 	  c = 0;
+	  __builtin_fallthrough ();
 	  default:
 	  switch (c)
 	  case 0:
diff --git gcc/gcc/testsuite/gcc.dg/tree-ssa/20030814-2.c gcc/gcc/testsuite/gcc.dg/tree-ssa/20030814-2.c
index a99abf4..8dde43f 100644
--- gcc/gcc/testsuite/gcc.dg/tree-ssa/20030814-2.c
+++ gcc/gcc/testsuite/gcc.dg/tree-ssa/20030814-2.c
@@ -1,5 +1,5 @@
 /* { dg-do compile } */
-/* { dg-options "-O1 -fdump-tree-dom2" } */
+/* { dg-options "-O1 -fdump-tree-dom2 -Wno-switch-fallthrough" } */
     
 extern void abort (void);
 extern void blah (void);
diff --git gcc/gcc/testsuite/gcc.dg/tree-ssa/20030814-3.c gcc/gcc/testsuite/gcc.dg/tree-ssa/20030814-3.c
index 149da1b..d95e780 100644
--- gcc/gcc/testsuite/gcc.dg/tree-ssa/20030814-3.c
+++ gcc/gcc/testsuite/gcc.dg/tree-ssa/20030814-3.c
@@ -1,5 +1,5 @@
 /* { dg-do compile } */
-/* { dg-options "-O1 -fdump-tree-dom2" } */
+/* { dg-options "-O1 -fdump-tree-dom2 -Wno-switch-fallthrough" } */
     
 extern void abort (void);
 extern void blah (void);
diff --git gcc/gcc/testsuite/gcc.dg/tree-ssa/inline-10.c gcc/gcc/testsuite/gcc.dg/tree-ssa/inline-10.c
index 118e19e..38048bb 100644
--- gcc/gcc/testsuite/gcc.dg/tree-ssa/inline-10.c
+++ gcc/gcc/testsuite/gcc.dg/tree-ssa/inline-10.c
@@ -1,5 +1,5 @@
 /* { dg-do compile } */
-/* { dg-options "-Os -fdump-tree-optimized -fno-partial-inlining" } */
+/* { dg-options "-Os -fdump-tree-optimized -fno-partial-inlining -Wno-switch-fallthrough" } */
 void do_something1(void);
 void do_something2(void);
 void do_something3(void);
diff --git gcc/gcc/testsuite/gcc.dg/tree-ssa/ssa-dom-thread-9.c gcc/gcc/testsuite/gcc.dg/tree-ssa/ssa-dom-thread-9.c
index 2d9028d..d9f80f6 100644
--- gcc/gcc/testsuite/gcc.dg/tree-ssa/ssa-dom-thread-9.c
+++ gcc/gcc/testsuite/gcc.dg/tree-ssa/ssa-dom-thread-9.c
@@ -1,6 +1,6 @@
 /* PR 65048 */
 /* { dg-do compile } */
-/* { dg-options "-O3 -std=gnu89" } */
+/* { dg-options "-O3 -std=gnu89 -Wno-switch-fallthrough" } */
 
 int a, b, c, d;
 void fn (void);
diff --git gcc/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-10.c gcc/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-10.c
index 7f2d1eb..d04335e 100644
--- gcc/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-10.c
+++ gcc/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-10.c
@@ -1,5 +1,5 @@
 /* { dg-do compile } */
-/* { dg-options "-O2 -fdump-tree-pre-stats" } */
+/* { dg-options "-O2 -fdump-tree-pre-stats -Wno-switch-fallthrough" } */
 
 union loc {  unsigned reg; signed offset; };
 void __frame_state_for (volatile char *state_in, int x)
diff --git gcc/gcc/testsuite/gcc.target/aarch64/pic-symrefplus.c gcc/gcc/testsuite/gcc.target/aarch64/pic-symrefplus.c
index 406568c..53e36b9 100644
--- gcc/gcc/testsuite/gcc.target/aarch64/pic-symrefplus.c
+++ gcc/gcc/testsuite/gcc.target/aarch64/pic-symrefplus.c
@@ -1,4 +1,4 @@
-/* { dg-options "-O2 -mcmodel=small -fPIC -fno-builtin" }  */
+/* { dg-options "-O2 -mcmodel=small -fPIC -fno-builtin -Wno-switch-fallthrough" }  */
 /* { dg-do compile } */
 
 typedef long unsigned int size_t;
diff --git gcc/gcc/testsuite/gcc.target/i386/avx2-vperm2i128-2.c gcc/gcc/testsuite/gcc.target/i386/avx2-vperm2i128-2.c
index 96f32b8..5a8b1ef 100644
--- gcc/gcc/testsuite/gcc.target/i386/avx2-vperm2i128-2.c
+++ gcc/gcc/testsuite/gcc.target/i386/avx2-vperm2i128-2.c
@@ -1,5 +1,5 @@
 /* { dg-do run } */
-/* { dg-options "-mavx2 -O2" } */
+/* { dg-options "-mavx2 -O2 -Wno-switch-fallthrough" } */
 /* { dg-require-effective-target avx2 } */
 
 #include "avx2-check.h"
diff --git gcc/gcc/testsuite/gcc.target/i386/pr46939.c gcc/gcc/testsuite/gcc.target/i386/pr46939.c
index 0fd8607..646b6a1 100644
--- gcc/gcc/testsuite/gcc.target/i386/pr46939.c
+++ gcc/gcc/testsuite/gcc.target/i386/pr46939.c
@@ -1,5 +1,5 @@
 /* { dg-do compile } */
-/* { dg-options "-O2" } */
+/* { dg-options "-O2 -Wno-switch-fallthrough" } */
 
 __extension__ typedef __SIZE_TYPE__ size_t;
 


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