re PR middle-end/7651 (Define -Wextra strictly in terms of other warning flags)

2006-05-20  Manuel Lopez-Ibanez  <manu@gcc.gnu.org>

	PR middle-end/7651
	* doc/invoke.texi (Wreturn-type): Complete description.
	(Wextra): Delete item about return-type warning.
	* c-decl.c: Delete redundant Wextra warning.

testsuite/
	* gcc.dg/20030906-1.c: Replace Wextra with Wreturn-type.
	* gcc.dg/20030906-2.c: Likewise.
	* objc.dg/method-17.m: Add -Wreturn-type.
	* obj-c++.dg/method-21.mm: Likewise.

From-SVN: r124866

gcc/ChangeLog

+2006-05-20  Manuel Lopez-Ibanez  <manu@gcc.gnu.org>
+
+	PR middle-end/7651
+	* doc/invoke.texi (Wreturn-type): Complete description.
+	(Wextra): Delete item about return-type warning.
+	* c-decl.c: Delete redundant Wextra warning.
+	
 2006-05-20  Uros Bizjak  <ubizjak@gmail.com>
 
 	PR target/31585

gcc/c-decl.c

@@ -6788,13 +6788,6 @@ finish_function (void)
       TREE_NO_WARNING (fndecl) = 1;
     }
 
-  /* With just -Wextra, complain only if function returns both with
-     and without a value.  */
-  if (extra_warnings
-      && current_function_returns_value
-      && current_function_returns_null)
-    warning (OPT_Wextra, "this function may return with or without a value");
-
   /* Store the end of the function, so that we get good line number
      info for the epilogue.  */
   cfun->function_end_locus = input_location;

gcc/doc/invoke.texi

@@ -2807,9 +2807,13 @@ This warning is enabled by @option{-Wall} for C and C++.
 
 @item -Wreturn-type
 @opindex Wreturn-type
-Warn whenever a function is defined with a return-type that defaults to
-@code{int}.  Also warn about any @code{return} statement with no
-return-value in a function whose return-type is not @code{void}.
+@opindex Wno-return-type
+Warn whenever a function is defined with a return-type that defaults
+to @code{int}.  Also warn about any @code{return} statement with no
+return-value in a function whose return-type is not @code{void}
+(falling off the end of the function body is considered returning
+without a value), and about a @code{return} statement with a
+expression in a function whose return-type is @code{void}.
 
 Also warn if the return type of a function has a type qualifier
 such as @code{const}.  For ISO C such a type qualifier has no effect,
@@ -3130,22 +3134,6 @@ messages for these events:
 
 @itemize @bullet
 @item
-A function can return either with or without a value.  (Falling
-off the end of the function body is considered returning without
-a value.)  For example, this function would evoke such a
-warning:
-
-@smallexample
-@group
-foo (a)
-@{
-  if (a > 0)
-    return a;
-@}
-@end group
-@end smallexample
-
-@item
 An unsigned value is compared against zero with @samp{<} or @samp{>=}.
 
 @item @r{(C only)}

gcc/testsuite/ChangeLog

+2006-05-20  Manuel Lopez-Ibanez  <manu@gcc.gnu.org>
+
+	PR middle-end/7651
+	* gcc.dg/20030906-1.c: Replace Wextra with Wreturn-type.
+	* gcc.dg/20030906-2.c: Likewise.
+	* objc.dg/method-17.m: Add -Wreturn-type.
+	* obj-c++.dg/method-21.mm: Likewise.
+	
 2006-05-20  Uros Bizjak  <ubizjak@gmail.com>
 
 	PR target/31585

gcc/testsuite/gcc.dg/20030906-1.c

@@ -2,7 +2,7 @@
    Copyright (C) 2003 Free Software Foundation Inc.  */
 
 /* { dg-do compile } */
-/* { dg-options "-O -finline-functions -Wextra" } */
+/* { dg-options "-O -finline-functions -Wreturn-type" } */
 
 extern int i;
 extern int foo (void);
@@ -12,10 +12,10 @@ int foo (void)
 {
   if( i ) return 0;
   else    return 1;
-}		/* { dg-bogus "may return with or without a value" } */
+}
 
 int bar (void)
 {
-  if( i ) return;
+  if( i ) return; /* { dg-warning "'return' with no value, in function returning non-void" } */
   else    return 1;
-}		/* { dg-warning "may return with or without a value" } */
+}		

gcc/testsuite/gcc.dg/20030906-2.c

@@ -2,7 +2,7 @@
    Copyright (C) 2003 Free Software Foundation Inc.  */
 
 /* { dg-do compile } */
-/* { dg-options "-O -finline-functions -Wextra" } */
+/* { dg-options "-O -finline-functions -Wreturn-type" } */
 
 extern int i;
 extern int foo (void);
@@ -10,9 +10,9 @@ extern int bar (void);
 
 int foo (void)
 {
-  if( i ) return;
+  if( i ) return; /* { dg-warning "'return' with no value, in function returning non-void" } */
   else    return 1;
-}		/* { dg-warning "may return with or without a value" } */
+}
 
 int bar (void)
 {

gcc/testsuite/obj-c++.dg/method-21.mm

 /* Test for spurious "may or may not return a value" warnings.  */
 /* { dg-do compile } */
-/* { dg-options "-Wextra" } */
+/* { dg-options "-Wreturn-type -Wextra" } */
 
 #include <objc/Object.h>
 

gcc/testsuite/objc.dg/method-17.m

 /* Test for spurious "may or may not return a value" warnings.  */
 
 /* { dg-do compile } */
-/* { dg-options "-Wextra" } */
+/* { dg-options "-Wreturn-type -Wextra" } */
 
 #include <objc/Object.h>
 
@@ -16,11 +16,11 @@ extern int bar;
 - (id) meth1 {
   if (bar)
     return [Object new];
-  return;
-} /* { dg-warning "this function may return with or without a value" } */
+  return; /* { dg-warning "'return' with no value, in function returning non-void" } */
+} 
 - (void) meth2 {
   if (!bar)
     return;
   bar = 0;
-} /* { dg-bogus "this function may return with or without a value" } */
+} /* { dg-bogus "'return' with no value, in function returning non-void" } */
 @end