[Toybox] The new gcc 9 bug you pointed out.

[enh]

Android has been clang-only for a couple of releases now, so toybox is
tested against a fairly current clang roughly every Friday when I sync
AOSP...

*From:*scsijon <scsijon at lamiaworks.com.au>
*Date:*Wed, May 8, 2019, 15:12
*To:*Rob Landley, toybox


>
> On 08/05/19 19:00, Rob Landley wrote:
> /cut
> > Anyway, you said:
> >
> >> Rob, this may also have an effect in toybox, ?maybe?
> >
> > And pulling up https://gitlab.gnome.org/GNOME/glib/merge_requests/626
> ... not
> > that I know of?
> >
> > They removed the debugging feature where printf("%s", NULL) would print
> "(null)"
> > instead of segfaulting trying to dereference the string. I never
> (intentionally)
> > relied on that outside of debug printfs (and have used libc's that
> segfaulted on
> > it before).
> >
> > Removing it seems kinda stupid, it's not the compiler's business to do
> so (it
> > would be the C library's), and making it an error instead of a warning
> is just
> > laughable. It seriously looks like gcc is end of life and I'm glad llvm
> isn't
> > being done by crazy people.
> >
> > But I'm unaware of _this_ particular bit of gcc stupidity hitting us?
> (And the
> > fix would be adding another -fstop-being-stupid anyway. Possibly
> disabling
> > printf() format detection entirely if it has such bad side effects.
> Building
> > with llvm would still find printf format/argument mismatches if so. "I
> fed it a
> > char *" is all it should care about, what's _in_ the char * at _runtime_
> is my
> > business, not the compiler's.)
> >
> > Rob
> >
>
> And was the reason I thought it was important enough to bring to your
> attention, I wasn't sure enough to just ignore it, and you have enough
> to deal with as it is.
>
> So we can expect toybox to be fully llvm/clang compatable soon, or is it
> already so now. I also want to try some of the smaller ones like pcc and
> tcc with toybox, for me gcc is getting too big and complicated for a
> compiler, it's time they considered archiving out some of it to an
> external component.
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>
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