[Bug bootstrap/68271] [6 Regression] Boostrap fails on x86_64-apple-darwin14 at r230084

["rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68271

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #3)
> DARWIN_REGISTER_TARGET_PRAGMAS registers 5.
> If I count well on Linux and yesterday's trunk, for -fopenmp -fopenacc
> -fcilkplus I see 10 OpenACC, 25 OpenMP, 2 Cilk+ and 22 other deferred
> pragmas being registered, if you add 5 to that it is 64.
> The comment in c-family is clearly outdated, the C parser uses 8 bits for
> pragma_kind.
> But, looking at parser.h, I see
>   /* The kind of token.  */
>   ENUM_BITFIELD (cpp_ttype) type : 8;
>   /* If this token is a keyword, this value indicates which keyword.
>      Otherwise, this value is RID_MAX.  */
>   ENUM_BITFIELD (rid) keyword : 8;
>   /* Token flags.  */
>   unsigned char flags;
>   /* Identifier for the pragma.  */
>   ENUM_BITFIELD (pragma_kind) pragma_kind : 6;
>   /* True if this token is from a context where it is implicitly extern "C"
> */
>   BOOL_BITFIELD implicit_extern_c : 1;
>   /* True if an error has already been reported for this token, such as a
>      CPP_NAME token that is not a keyword (i.e., for which KEYWORD is
>      RID_MAX) iff this name was looked up and found to be ambiguous.  */
>   BOOL_BITFIELD error_reported : 1;
>   /* True for a token that has been purged.  If a token is purged,
>      it is no longer a valid token and it should be considered
>      deleted.  */
>   BOOL_BITFIELD purged_p : 1;
> which if I count well is already 33 bits anyway, followed by 32-bit integer
> and pointer, therefore on 64-bit hosts there are 63 bits of padding and on
> 32-bit hosts 31 bits of padding.

That should be fixed of course.  Maybe some unioning can be done as well
based on 'type' (keyword?)