[Bug fortran/47605] Document that C_Bool might be the wrong constant for C Booleans

[dominiq at lps dot ens.fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47605

Dominique d'Humieres <dominiq at lps dot ens.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2014-03-22
     Ever confirmed|0                           |1

--- Comment #1 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
In [1] I see

> For logical types, please note that the Fortran standard only guarantees
> interoperability between C99's _Bool and Fortran's C_Bool-kind logicals and C99
> defines that true has the value 1 and false the value 0. Using any other integer
> value with GNU Fortran's LOGICAL (with any kind parameter) gives an undefined
> result. (Passing other integer values than 0 and 1 to GCC's _Bool is also
> undefined, unless the integer is explicitly or implicitly casted to _Bool.)

What should be added to that?