From: already5chosen@yahoo.com   
      
   On Fri, 6 Feb 2026 12:39:55 +0000   
   Bart  wrote:   
      
   > On 06/02/2026 05:10, Keith Thompson wrote:   
   > > Bart  writes:   
   > > [...]   
   > >> /Some/ compilers with /some/ options will /sometimes/ tell you when   
   > >> you've got it wrong.   
   > >>   
   > >> But you first have to make an educated guess, or put in some dummy   
   > >> format code.   
   > >>   
   > >> Eventually, it will compile. Until someone else builds your   
   > >> program, using a slightly different set of headers where certain   
   > >> types are defined, and then it might either give compiler messages   
   > >> that they have to fix, or it show wrong results.   
   > >   
   > > That's not how I do it, and I don't think it's how most programmers   
   > > do it.   
   > >   
   > > I know the rules well enough that I can usually write a correct   
   > > format string in the first place.  If I make a mistake, gcc's   
   > > warnings are a nice check.   
   >   
   > I guess you've never used printf-family functions via the FFI of   
   > another language!   
   >   
   >   
      
   Vararg via FFI? Is it really a good idea?   
      
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