[Bug c++/17542] Visibility attribute ignored when it precedes class head

[jsm at polyomino dot org dot uk]

------- Additional Comments From jsm at polyomino dot org dot uk  2004-10-01 23:29 -------
Subject: Re:  Visibility attribute ignored when it precedes
 class head

On Fri, 1 Oct 2004, austern at apple dot com wrote:

> I hesitate to call this "behaves correctly", since this behavior is 
> unexpected, hard to understand, and leads to the user silently not 
> getting what they expected.  I'm afraid that with visibility, in 
> particular, it'll lead to problems because users will want to hide this 
> attribute list behind macros that expand to different things on 
> different platforms.  But I'm also not completely sure what the best 
> thing to do is.

It is at least documented to some extent ("Attribute Syntax"), although 
with a warning that C++ may vary from C.

>  2. If cp_parser_simple_declaration collects attributes in 
> cp_parser_decl_specifier_seq and it's throwing them away because there's 
> no declarator to apply them to, then warn the user and suggest a better 
> place to put the attribute list.

FWIW, I've been considering such a warning for C, to go along with the 
warnings for useless type qualifiers and storage class specifiers on empty 
declarations.



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17542