Re: AIX 4.3.3 IBM C compiler patch for m4-1.4.8

[Eric Blake]

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According to Paul Eggert on 2/4/2007 10:59 AM:
> I don't know any way to do this.  'bool' must promote to int, so
> the only plausible candidates that can be used for bit-fields are
> int and signed int.  But bool bitfields have a value 0 or 1, whereas
> a signed bitfield has the value 0 or -1 (on two's complement hosts).

Would it be worth defining something such as BOOL_BITFIELD that expands to
:1 on hosts with sane definitions of bool for the space savings, but to :2
(or even an empty expansion) on lacking hosts such as AIX where we could
then define bool to signed int and still get some space savings while
still getting the correct 0/1 behavior?

bool foo BOOL_BITFIELD;

Type-wise, it just seems nicer to use a bool bitfield than to have to
revert to int, when using that bitfield as a bool.  But if this idea isn't
worth it, then I guess I will have to change m4 to avoid bool bitfields.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             address@hidden
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