[Bug c/37874] gcc sometimes accepts attribute in identifier list

[joseph at codesourcery dot com]

------- Comment #4 from joseph at codesourcery dot com  2008-10-20 12:48 -------
Subject: Re:  gcc sometimes accepts attribute in identifier list

On Mon, 20 Oct 2008, sabre at nondot dot org wrote:

> as it turns out, f3 could also be considered valid in c89... because it makes x
> and y be implicit int's, not an identifier list.

All parameters need a nonempty list of declaration specifiers in a 
parameter type list, which y doesn't have in that case.  Implicit int in 
C90 (removed in C99) means that list could just be "const", for example, 
but not completely empty.

That the first parameter in a parameter type list must have some 
*non-attribute* declaration specifier is documented in "Attribute Syntax" 
along with the ambiguity this resolves.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37874