static arrays in C functions

[Bill Baxter]

On Tue, Dec 8, 2009 at 2:08 AM, Lutger <lutger.blijdestijn at gmail.com> wrote:
> Since a while some extern(C) functions which take arrays seem to be broken.
> Can anybody clarify /confirm how they should be declared?
>
> For example I stumbled upon this:
>
> import core.sys.posix.unistd, std.stdio;
>
> void main()
> {
>    int[2] fd;
>    writeln( pipe(fd) ); // failes with errno == EFAULT
> }
>
> In core.sys.posix.unistd, pipe is declared as: int pipe(int[2]);
>
>
> This works though:
>
> extern (C) { int pipe(int*); }
>
> void main()
> {
>    int[2] fd;
>    writeln( pipe(fd.ptr) );
> }

(Assuming you're talking about D2 here...)
A few releases ago fixed-size arrays changed to be pass-by-value.
But I guess there's still some logic in there to interpret int[2] as
int* when inside an extern(C) block.

It does seem like there's a bug there, though.  I think pipe(fd) in
the first case should fail to compile because it's attempting to pass
by value where a pointer is expected.

--bb