+2003-07-25 Nathan Sidwell <nathan@codesourcery.com>
+
+ * doc/extend.texi (Function Attributes): GNU C++ does now allow
+ unused parameter decls.
+ (Attribute Syntax): GNU C++ does not allow label attributes to be
+ after the ':'.
+
2003-07-25 Gabriel Dos Reis <gdr@integrable-solutions.net>
* objc/objc-act.c (objc_check_decl): Don't use xxx_with_decl.
@item unused
This attribute, attached to a function, means that the function is meant
to be possibly unused. GCC will not produce a warning for this
-function. GNU C++ does not currently support this attribute as
-definitions without parameters are valid in C++.
+function.
@cindex @code{used} attribute.
@item used
An @dfn{attribute specifier list} is a sequence of one or more attribute
specifiers, not separated by any other tokens.
-An attribute specifier list may appear after the colon following a
+In GNU C, an attribute specifier list may appear after the colon following a
label, other than a @code{case} or @code{default} label. The only
attribute it makes sense to use after a label is @code{unused}. This
feature is intended for code generated by programs which contains labels
that may be unused but which is compiled with @option{-Wall}. It would
not normally be appropriate to use in it human-written code, though it
could be useful in cases where the code that jumps to the label is
-contained within an @code{#ifdef} conditional.
+contained within an @code{#ifdef} conditional. GNU C++ does not permit
+such placement of attribute lists, as it is permissible for a
+declaration, which could begin with an attribute list, to be labelled in
+C++. Declarations cannot be labelled in C90 or C99, so the ambiguity
+does not arise there.
An attribute specifier list may appear as part of a @code{struct},
@code{union} or @code{enum} specifier. It may go either immediately