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

30 Jun 2005

      Gen Zhang writes:
...
On Thu, 2005-06-30 at 08:30 -0400, David Abrahams wrote:
...
Dave Steffen  writes:
...
I claim that our macros and use thereof is A) correct and B) safe.
 It just so happens that these macro constructs occasionally expand to
 something that has an extra semicolon, which triggers a warning in
 GCC 3.4 that we haven't seen before.
The warning will be an error on other compilers.  The semicolons
aren't just "bad style;" they're illegal.
I believe The Book specifically allows an optional semicolon at the end
of a function declaration in the global scope. They are illegal in a
class. And necessary at the end of a class/struct definition. I have a
friend who runs into this problem a lot. :D
Yeah, this is one question - is it legal?

 If so, the next question is : can we find anything to stick on the
 end of these macros to make it legal?  For example, I think a
 variable declaration might be OK there.  So maybe we do something
 like having the macro expand into (this is nasty, but it might work) 

 int Foo() { ... }  int i_am_a_variable_at_line_970_of_file_X

 in which case a trailing semicolon would be perfectly at home. 

 Of course, this is rather nasty for all kinds of reasons.  Is there a
 way to make a "null declaration"? :-)

----------------------------------------------------------------------
Dave Steffen, Ph.D.       "There are two ways to write error-free
Software Engineer IV       programs; only the third one works."
Numerica Corporation            
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