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[Bug fortran/47605] Document that C_Bool might be the wrong constant for C Booleans
- From: "dominiq at lps dot ens.fr" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Sat, 22 Mar 2014 19:34:16 +0000
- Subject: [Bug fortran/47605] Document that C_Bool might be the wrong constant for C Booleans
- Auto-submitted: auto-generated
- References: <bug-47605-4 at http dot gcc dot gnu dot org/bugzilla/>
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?