patch for unsigned bitfields

[Zack Weinberg]

On Tue, Apr 18, 2000 at 02:34:49PM -0500, Robert Lipe wrote:
> > > +AC_MSG_CHECKING(for unsigned enumerated bitfields)
> > > +AC_CACHE_VAL(gcc_cv_enum_bf_unsigned, 
> > 
> > AC_CACHE_CHECK(for unsigned enumerated bitfields, gcc_cv_enum_bf_unsigned,
> > 
> > ...
> > > +  AC_DEFINE(ENUM_BITFIELDS_ARE_UNSIGNED)
> > 
> > If you write this as
> > 
> >      AC_DEFINE(ENUM_BITFIELDS_ARE_UNSIGNED, 1,
> >        [Define if enumerated bitfields are treated as unsigned values.])
> > 
> > then you don't have to add anything to acconfig.h.
> 
> I had noticed these forms in the autoconf doc.  I made a conscious
> decision to mimic the style used elsewhere in gcc/configure.in instead
> of using those.  (When in Rome...)  Certainly I don't feel strongly
> about it.  I have now committed that with your suggestions incorporated.

I don't feel strongly about AC_CACHE_VAL/CHECK, but I do think the
three-argument form of AC_DEFINE is much more maintainable than having
to remember to update acconfig.h.  Also, Kaveh's meaning to patch all
the one-argument AC_DEFINEs and make acconfig.h much shorter (empty,
if possible).  Let's not give him more work.

zw