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

From: Dave Steffen (dgsteffen_at_[hidden])
Date: 2005-06-30 16:55:49

Gen Zhang writes:
 > On Thu, 2005-06-30 at 08:30 -0400, David Abrahams wrote:
 > > Dave Steffen <dgsteffen_at_[hidden]> 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            
ph [phone] x27     "Pie are not square. Pie are round. 
fax [phone]         Cornbread are square"
dgsteffen_at_[hidden]                    ... anon (usenet)
___________________
Numerica Disclaimer:
This message and any attachments are intended only for the individual
or entity to which the message is addressed.  It is proprietary and
may contain privileged information.  If you are neither the intended
recipient nor the agent responsible for delivering the message to the
intended recipient, you are hereby notified that any review,
retransmission, dissemination, or taking of any action in reliance
upon, the information in this communication is strictly prohibited,
and may be unlawful.  If you feel you have received this communication
in error, please notify us immediately by returning this Email to the
sender and deleting it from your computer.