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

2007-02-12  Manuel Lopez-Ibanez  <manu@gcc.gnu.org>

	PR middle-end/7651
	* doc/invoke.texi (Wunused-value): Update description.
	(Wextra): Delete item.
	* opts.c (set_Wextra): Don't use the value of Wextra to set the
	value of Wunused-value.
	* c-typeck.c (c_process_expr_stmt): Don't check extra_warnings.
	(c_finish_stmt_expr): Don't check extra_warnings.
	(emit_side_effect_warnings): The caller is responsible to check
	warn_unused_value.
cp/
	* cp-gimplify.c (gimplify_expr_stmt): Don't check extra_warnings.
	Check warn_unused_value just once.

From-SVN: r121843

1 files changed, 7 insertions, 10 deletions

diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index ad5b31d..b435781 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -2730,10 +2730,14 @@ To suppress this warning use the @samp{unused} attribute
 
 @item -Wunused-value
 @opindex Wunused-value
-Warn whenever a statement computes a result that is explicitly not used.
-This warning is enabled by @option{-Wall}.
+Warn whenever a statement computes a result that is explicitly not
+used. To suppress this warning cast the unused expression to
+@samp{void}. This includes an expression-statement or the left-hand
+side of a comma expression that contains no side effects. For example,
+an expression such as @samp{x[i,j]} will cause a warning, while
+@samp{x[(void)i,j]} will not.
 
-To suppress this warning cast the expression to @samp{void}.
+This warning is enabled by @option{-Wall}.
 
 @item -Wunused
 @opindex Wunused
@@ -2909,13 +2913,6 @@ foo (a)
 @end smallexample
 
 @item
-An expression-statement or the left-hand side of a comma expression
-contains no side effects.
-To suppress the warning, cast the unused expression to void.
-For example, an expression such as @samp{x[i,j]} will cause a warning,
-but @samp{x[(void)i,j]} will not.
-
-@item
 An unsigned value is compared against zero with @samp{<} or @samp{>=}.
 
 @item @r{(C only)}