[Bug tree-optimization/21982] GCC should combine adjacent stdio calls

["joseph at codesourcery dot com" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From joseph at codesourcery dot com  2005-06-09 17:11 -------
Subject: Re:  GCC should combine adjacent stdio
 calls

On Thu, 9 Jun 2005, ghazi at gcc dot gnu dot org wrote:

> 
> ------- Additional Comments From ghazi at gcc dot gnu dot org  2005-06-09 16:55 -------
> (In reply to comment #3)
> > Subject: Re:  GCC should combine adjacent stdio
> >  calls
> > Another problem case is if the first format has excess arguments (which is 
> > permitted by ISO C) - those arguments must be evaluated but not included 
> > in the concatenated argument list.
> 
> While it may be legal, our -Wformat option warns about excess arguments and I 
> would suggest we don't attempt any optimization unless we pass -Wformat 
> cleanly.  So I think this one is surmountable.

We linked -Wformat into optimization before, then removed the link.  
Although we could resurrect the status_warning function which could set a 
status variable if it would warn rather than emitting the warning (and 
again save and restore all the variable controlling format warnings), it's 
not clear this is very desirable.



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21982