Revert r114316, -Wunused-value enabled by default was intended.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@114318 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/Basic/DiagnosticSemaKinds.td

@@ -2770,16 +2770,16 @@ def ext_typecheck_expression_not_constant_but_accepted : Extension<
   "expression is not a constant, but is accepted as one by GNU extensions">, 
   InGroup<GNU>;
 def warn_unused_expr : Warning<"expression result unused">,
-  InGroup<UnusedValue>, DefaultIgnore;
+  InGroup<UnusedValue>;
 def warn_unused_voidptr : Warning<
   "expression result unused; should this cast be to 'void'?">,
-  InGroup<UnusedValue>, DefaultIgnore;
+  InGroup<UnusedValue>;
 def warn_unused_property_expr : Warning<
  "property access result unused - getters should not be used for side effects">,
-  InGroup<UnusedValue>, DefaultIgnore;
+  InGroup<UnusedValue>;
 def warn_unused_call : Warning<
   "ignoring return value of function declared with %0 attribute">,
-  InGroup<UnusedValue>, DefaultIgnore;
+  InGroup<UnusedValue>;
 
 def err_incomplete_type_used_in_type_trait_expr : Error<
   "incomplete type %0 used in type trait expression">;

test/Analysis/dead-stores.c

@@ -300,11 +300,11 @@ void f22() {
   case 7:
     (void)(0 && x);
     (void)y7;
-    (void)(0 || (y8, ({ return; }), 1));
+    (void)(0 || (y8, ({ return; }), 1));  // expected-warning {{expression result unused}}
     (void)x;
     break;
   case 8:
-    (void)(1 && (y9, ({ return; }), 1));
+    (void)(1 && (y9, ({ return; }), 1));  // expected-warning {{expression result unused}}
     (void)x;
     break;
   case 9:

test/Analysis/misc-ps.m

@@ -466,7 +466,7 @@ unsigned char test_array_index_bitwidth(const unsigned char *p) {
 // It should not crash.
 void test_block_cast() {
   id test_block_cast_aux();
-  (void (^)(void *))test_block_cast_aux();
+  (void (^)(void *))test_block_cast_aux(); // expected-warning{{expression result unused}}
 }
 
 int OSAtomicCompareAndSwap32Barrier();
@@ -673,7 +673,7 @@ CGFloat rdar7242006(CGFloat x) {
 //  when not explicitly used in an "lvalue" context (as far as the analyzer is
 //  concerned). This previously triggered a crash due to an invalid assertion.
 void pr_4988(void) {
-  pr_4988;
+  pr_4988; // expected-warning{{expression result unused}}
 }
 
 // <rdar://problem/7152418> - A 'signed char' is used as a flag, which is

test/Misc/caret-diags-macros.c

@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -fsyntax-only -Wunused-value %s > %t 2>&1
+// RUN: %clang_cc1 -fsyntax-only %s > %t 2>&1
 
 #define M1(x) x
 

test/Parser/expressions.m

@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -Wunused-value -fsyntax-only -verify %s
+// RUN: %clang_cc1 -fsyntax-only -verify %s
 
 void test1() {
   @"s";            // expected-warning {{expression result unused}}

test/Parser/objc-messaging-1.m

@@ -6,14 +6,21 @@ int main ()
         id a, b, c;
 	[a ii]; // expected-warning{{not found}}
 	[a if: 1 :2]; // expected-warning{{not found}}
-	[a inout: 1 :2 another:(2,3,4)]; // expected-warning{{not found}}
-	[a inout: 1 :2 another:(2,3,4), 6,6,8]; // expected-warning{{not found}}
-	[a inout: 1 :2 another:(2,3,4), (6,4,5),6,8]; // expected-warning{{not found}}
-	[a inout: 1 :2 another:(i+10), (i,j-1,5),6,8]; // expected-warning{{not found}}
-	[a long: 1 :2 another:(i+10), (i,j-1,5),6,8]; // expected-warning{{not found}}
-	[a : "Hello\n" :2 another:(i+10), (i,j-1,5),6,8]; // expected-warning{{not found}}
+	[a inout: 1 :2 another:(2,3,4)]; // expected-warning{{not found}} \
+           // expected-warning 2{{expression result unused}}
+	[a inout: 1 :2 another:(2,3,4), 6,6,8]; // expected-warning{{not found}} \
+           // expected-warning 2{{expression result unused}}
+	[a inout: 1 :2 another:(2,3,4), (6,4,5),6,8]; // expected-warning{{not found}} \
+           // expected-warning 4{{expression result unused}}
+	[a inout: 1 :2 another:(i+10), (i,j-1,5),6,8]; // expected-warning{{not found}} \
+           // expected-warning 2{{expression result unused}}
+	[a long: 1 :2 another:(i+10), (i,j-1,5),6,8]; // expected-warning{{not found}} \
+           // expected-warning 2{{expression result unused}}
+	[a : "Hello\n" :2 another:(i+10), (i,j-1,5),6,8]; // expected-warning{{not found}} \
+           // expected-warning 2{{expression result unused}}
 
 	// Comma expression as receiver (rdar://6222856)
-	[a, b, c foo]; // expected-warning{{not found}}
+	[a, b, c foo]; // expected-warning{{not found}} \
+           // expected-warning 2{{expression result unused}}
 
 }

test/Parser/objc-try-catch-1.m

@@ -27,13 +27,15 @@ void * foo()
       return proc();
     }
     @catch (Frob* ex) {
-      @throw 1,2; // expected-error {{@throw requires an Objective-C object type ('int' invalid)}}
+      @throw 1,2; // expected-error {{@throw requires an Objective-C object type ('int' invalid)}} \
+				  // expected-warning {{expression result unused}}
     }
     @catch (float x) {  // expected-error {{@catch parameter is not a pointer to an interface type}}
       
     }
     @catch(...) {
-      @throw (4,3,proc());
+      @throw (4,3,proc()); // expected-warning {{expression result unused}} \
+						   // expected-warning {{expression result unused}}
     }
   }
 
@@ -46,7 +48,7 @@ void * foo()
 void bar()
 {
   @try {}// expected-error {{@try statement without a @catch and @finally clause}}
-  @"s";
+  @"s"; //  expected-warning {{result unused}}
 }
 
 void baz()

test/Preprocessor/pragma_microsoft.c

@@ -36,5 +36,5 @@ void f()
 
   // If we ever actually *support* __pragma(warning(disable: x)),
   // this warning should go away.
-  MACRO_WITH__PRAGMA
+  MACRO_WITH__PRAGMA // expected-warning {{expression result unused}}
 }

test/Sema/enum.c

@@ -44,10 +44,10 @@ void test4() {
     ;
   (_Bool)ve2;  // expected-error {{arithmetic or pointer type is required}}
 
-  for (; ;ve2)
+  for (; ;ve2) // expected-warning {{expression result unused}}
     ;
   (void)ve2;
-  ve2;
+  ve2;         // expected-warning {{expression result unused}}
 }
 
 // PR2416

test/Sema/ext_vector_components.c

@@ -16,7 +16,7 @@ static void test() {
 
     vec2.z; // expected-error {{vector component access exceeds type 'float2'}}
     vec2.xyzw; // expected-error {{vector component access exceeds type 'float2'}}
-    vec4.xyzw;
+    vec4.xyzw; // expected-warning {{expression result unused}}
     vec4.xyzc; // expected-error {{illegal vector component name 'c'}}
     vec4.s01z; // expected-error {{illegal vector component name 'z'}}
     vec2 = vec4.s01; // legal, shorten

test/Sema/i-c-e.c

@@ -50,9 +50,11 @@ char y[__builtin_constant_p(expr) ? -1 : 1];
 char z[__builtin_constant_p(4) ? 1 : -1];
 
 // Comma tests
-int comma1[0?1,2:3];
-int comma2[1||(1,2)]; // expected-warning {{use of logical || with constant operand}}
-int comma3[(1,2)]; // expected-warning {{size of static array must be an integer constant expression}}
+int comma1[0?1,2:3];  // expected-warning {{expression result unused}}
+int comma2[1||(1,2)]; // expected-warning {{expression result unused}} \
+                      // expected-warning {{use of logical || with constant operand}}
+int comma3[(1,2)]; // expected-warning {{size of static array must be an integer constant expression}} \
+					// expected-warning {{expression result unused}}
 
 // Pointer + __builtin_constant_p
 char pbcp[__builtin_constant_p(4) ? (intptr_t)&expr : 0]; // expected-error {{variable length array declaration not allowed at file scope}}

test/Sema/statements.c

@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 %s -fsyntax-only -Wunused-value -verify
+// RUN: %clang_cc1 %s -fsyntax-only -verify
 
 typedef unsigned __uint32_t;
 

test/Sema/unused-expr.c

@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -fsyntax-only -verify %s -Wno-unreachable-code -Wunused-value
+// RUN: %clang_cc1 -fsyntax-only -verify %s -Wno-unreachable-code
 
 int foo(int X, int Y);
 

test/SemaCXX/cast-conversion.cpp

@@ -15,7 +15,8 @@ struct B {
 int main () {
   B(10);	// expected-error {{functional-style cast from 'int' to 'B' is not allowed}}
   (B)10;	// expected-error {{C-style cast from 'int' to 'B' is not allowed}}
-  static_cast<B>(10);	// expected-error {{static_cast from 'int' to 'B' is not allowed}}
+  static_cast<B>(10);	// expected-error {{static_cast from 'int' to 'B' is not allowed}} \\
+			// expected-warning {{expression result unused}}
 }
 
 template<class T>

test/SemaCXX/decl-expr-ambiguity.cpp

@@ -12,11 +12,11 @@ void f() {
   __typeof(int)(a,5)<<a; // expected-error {{excess elements in scalar initializer}}
   void(a), ++a;
   if (int(a)+1) {}
-  for (int(a)+1;;) {}
+  for (int(a)+1;;) {} // expected-warning {{expression result unused}}
   a = sizeof(int()+1);
   a = sizeof(int(1));
   typeof(int()+1) a2; // expected-error {{extension used}}
-  (int(1));
+  (int(1)); // expected-warning {{expression result unused}}
 
   // type-id
   (int())1; // expected-error {{C-style cast from 'int' to 'int ()' is not allowed}}

test/SemaCXX/overloaded-operator.cpp

@@ -157,7 +157,7 @@ bool& operator,(X, Y);
 
 void test_comma(X x, Y y) {
   bool& b1 = (x, y);
-  X& xr = (x, x);
+  X& xr = (x, x); // expected-warning {{expression result unused}}
 }
 
 struct Callable {

test/SemaCXX/warn-unused-variables.cpp

@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -fsyntax-only -Wunused-variable -Wunused-value -verify %s
+// RUN: %clang_cc1 -fsyntax-only -Wunused-variable -verify %s
 template<typename T> void f() {
   T t;
   t = 17;

test/SemaObjC/invalid-code.m

@@ -9,7 +9,7 @@ void test1() {
 // This previously triggered a crash because the class has not been defined.
 @implementation RDar7495713 (rdar_7495713_cat)  // expected-error{{cannot find interface declaration for 'RDar7495713'}}
 - (id) rdar_7495713 {
-  __PRETTY_FUNCTION__;
+  __PRETTY_FUNCTION__; // expected-warning{{expression result unused}}
 }
 @end