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

From: Dave Steffen (dgsteffen_at_[hidden])
Date: 2005-06-29 11:59:27

Bronek Kozicki writes:
 > Dave Steffen <dgsteffen_at_[hidden]> wrote:
 > > #define FOO(T)  \
 > 
 > #define FOO do{/* here goes your macro */} while(0)

 Yes, I've seen this in the GCC documentation.  Unfortunately, it
 doesn't help if you're doing the sort of preprocessor metaprogramming
 we're doing. In one case in particular, the end result of the macro
 really is supposed to be a _function declaration_, not a section of
 code.

 In another case, it shows up from the construct 

#define NUM_SIG_CONNECTION_FUNCTIONS_FOR_MEMBERS(first,last) \
  BOOST_PP_REPEAT_FROM_TO(BOOST_PP_ADD(first,1),BOOST_PP_ADD(last,2),\
                          NUM_SIG_DECLARE_CONNECT,BOOST_PP_EMPTY)

 I don't claim to understand everything that's going on here (even
 remotely), but GCC 3.2 and 3.3 are very happy with the usage (in a
 header file) 

NUM_SIG_CONNECTION_FUNCTIONS_FOR_MEMBERS(0, MAX_SIGNAL_ARGS);

 while 3.4 complains about that semicolon.  What I'm asking is A) does
 anyone know if 3.4 has a particular -Wno-extra-semicolon, or
 equivalent, to turn off that warning; or B) what is the proper
 preprocessor metaprogramming technique to silence the warning.

 Thanks!!

----------------------------------------------------------------------
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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fax [phone]         Cornbread are square"
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