[Bug fortran/47023] [4.6/4.7 regression] C_Sizeof: Rejects valid code

[burnus at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47023

--- Comment #9 from Tobias Burnus <burnus at gcc dot gnu.org> 2011-09-29 15:49:32 UTC ---
(In reply to comment #8)
> This patch itself doesn't do anything wrong AFAICS, it rather seems to expose
> an underlying bug: Either we need to set the 'is_c_interop' flag correctly or
> loosen the checks in verify_c_interop.

I think the latter. I think one can allow all intrinsic types. However, one
needs to be careful with characters: kind=4 is not interoperable and, e.g., for
dummies only len=1 is allowed (while via storage association, c_char_"string"
is a valid argument for a "character(len=1,kind=c_char) :: dummy(*)").

Note, additionally, that setting attr.is_c_interop is kind of difficult for
0.0_c_int ...