Re: %define boolean variables

[Paolo Bonzini]

> So again, my plan is to remove the value-less form of %define.  I'll also 
> rewrite b4_percent_define_flag_if to invoke b4_complain when the user 
> specifies anything other than "true" or "false".

No, please.  The reason for this is the parallel with the C preprocessor 
(where, except in Autoconf :-), you define symbols with `#define FOO'.

As a compromise, if you keep the current behavior of empty being true, 
and `%define FOO' aliasing `%define FOO ""', it's ok for me to complain 
on anything but empty/"true"/"false", including making "0" or "1" invalid.

Paolo