re PR middle-end/42674 (Bogus "no return statement in function returning non-void" warning)

	PR middle-end/42674
	* c-decl.c (finish_function): Don't emit -Wreturn-type warnings in
	functions with noreturn attribute.

	* decl.c (finish_function): Don't emit -Wreturn-type warnings in
	functions with noreturn attribute.

	* c-c++-common/pr42674.c: New test.

From-SVN: r155920

gcc/ChangeLog

 2010-01-14  Jakub Jelinek  <jakub@redhat.com>
 
+	PR middle-end/42674
+	* c-decl.c (finish_function): Don't emit -Wreturn-type warnings in
+	functions with noreturn attribute.
+
 	PR c++/42608
 	* varasm.c (declare_weak): Add weak attribute to decl if it
 	doesn't have one already.

gcc/c-decl.c

@@ -8032,6 +8032,8 @@ finish_function (void)
       && !current_function_returns_value && !current_function_returns_null
       /* Don't complain if we are no-return.  */
       && !current_function_returns_abnormally
+      /* Don't complain if we are declared noreturn.  */
+      && !TREE_THIS_VOLATILE (fndecl)
       /* Don't warn for main().  */
       && !MAIN_NAME_P (DECL_NAME (fndecl))
       /* Or if they didn't actually specify a return type.  */

gcc/cp/ChangeLog

+2010-01-14  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/42674
+	* decl.c (finish_function): Don't emit -Wreturn-type warnings in
+	functions with noreturn attribute.
+
 2010-01-14  Jason Merrill  <jason@redhat.com>
 
 	PR c++/42701

gcc/cp/decl.c

@@ -12541,6 +12541,8 @@ finish_function (int flags)
       && !current_function_returns_value && !current_function_returns_null
       /* Don't complain if we abort or throw.  */
       && !current_function_returns_abnormally
+      /* Don't complain if we are declared noreturn.  */
+      && !TREE_THIS_VOLATILE (fndecl)
       && !DECL_NAME (DECL_RESULT (fndecl))
       && !TREE_NO_WARNING (fndecl)
       /* Structor return values (if any) are set by the compiler.  */

gcc/testsuite/ChangeLog

 2010-01-14  Jakub Jelinek  <jakub@redhat.com>
 
+	PR middle-end/42674
+	* c-c++-common/pr42674.c: New test.
+
 	PR c++/42608
 	* g++.dg/template/instantiate11.C: New test.
 

gcc/testsuite/c-c++-common/pr42674.c

+/* PR middle-end/42674 */
+/* { dg-do compile } */
+/* { dg-options "-Wreturn-type" } */
+
+extern void bar (void);
+static int foo (void) __attribute__ ((__noreturn__, __used__));
+
+static int
+foo (void)
+{
+  while (1)
+    bar ();
+}