Hal Murray <hmur...@megapathdsl.net>:
>
> e...@thyrsus.com said:
> > Probablty compiler version. As GCC has evolved it has gotten stricter about
> > this sort of thing.
>
> Fedora 29, no warnings:
> gcc (GCC) 8.3.1 20190223 (Red Hat 8.3.1-2)
>
> Ubuntu 18.10, warnings
> gcc (Ubuntu 8.2.0-7ubuntu1) 8.2.0
>
> Ubuntu 18.04.2 LTS, warnings
> gcc (Ubuntu 7.3.0-27ubuntu1~18.04) 7.3.0
Huh. OK, it's weirder than I knew then. I don't know where the variation is
coming
from.
> > This is probably what you want:
> > ./include/ntp_stdlib.h:162:#define IGNORE(r) do{if(r){}}while(0)
>
> Thanks. Seems to be working.
>
> While does that need the do/while around the if? Doesn't the if alone do
> what
> we want?
The do/while is a weird trick to make the macro statement-like so that you can
(and in fact must) follow it with a ;.
--
<a href="http://www.catb.org/~esr/";>Eric S. Raymond</a>
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