Re: [Boost-users] supressing "extra ;" warnings with GCC 3.4

From: Ben Hutchings (ben.hutchings_at_[hidden])
Date: 2005-07-01 10:12:48

Brian Allison wrote:

>   The next production rule is:
>
>             /simple-declaration:
>                 decl-specifier-seqopt init-declarator-listopt  ;/
>
>   Note that the only thing that isn't /optional/ is the semicolon.
>
>   Presuming the book has no typos, presuming the grammar is a valid 
> representation of the C++ specification,

This grammar matches that given in the standard, but that is 
informative, not normative. It is not allowable for both the "optional" 
parts to be missing. 7/3 says that "...the optional 
/init-declarator-list /can be omitted only when declaring a class...or 
enumeration..." and 7/7 says that "[o]nly in function declarations for 
constructors, destructors, and type conversions can the 
/decl-specifier-seq /be omitted."

> then it would seem that a spurious semicolon at the end of any global 
> declaration is itself a global declaration and is not an error.

It is an error. A redundant semi-colon is only allowed as a degenerate 
case of an expression statement, where such statements are allowed, or 
immediately after a member function definition within a class definition.

Ben.