bind'ing a native function behaves incorrectly

[jwise]

The following code is miscompiled on my OS X laptop:

use std;

native "cdecl" mod libc = "" {
    fn printf(s: *u8, a: int); /* A tenuous definition, indeed.  Herp, derp. */
}

fn main() {
    let b = std::str::bytes("%d\n");
    let b8 = unsafe { std::vec::unsafe::to_ptr(b) };
    libc::printf(b8, 4);
    let a = bind libc::printf(b8, 5);
    a(); /* core dump */
}

I also reproed on my Linux machine, in which I captured this GDB session:

(gdb) break printf
Breakpoint 1 at 0x8048b78
(gdb) run
Starting program: /storage/homes/joshua/rust/build/bindbad
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread 0xf7917b70 (LWP 15444)]
[Switching to Thread 0xf7917b70 (LWP 15444)]

Breakpoint 1, __printf (format=0x804ca68 "%d\n") at printf.c:29
29      printf.c: No such file or directory.
        in printf.c
(gdb) c
Continuing.
4

Breakpoint 1, __printf (format=0x10 <Address 0x10 out of bounds>) at printf.c:29
29      in printf.c
(gdb)

[nikomatsakis]

This is probably related to issues #1058 and #1059. I have a planned fix for these problems (basically, generate a stub function that follows rust conventions). If I find the time I may put it in today. In the short term, you can do the same: generate a Rust wrapper.

[nikomatsakis]

Indeed, this works fine:

use std;

native "cdecl" mod libc = "" {
    fn printf(s: *u8, a: int); /* A tenuous definition, indeed.  Herp, derp. */
}

fn printf(s: *u8, a: int) {
    libc::printf(s, a);
}

fn main() {
    let b = std::str::bytes("%d\n");
    let b8 = unsafe { std::vec::unsafe::to_ptr(b) };
    printf(b8, 4);
    let a = bind printf(b8, 5);
    a(); /* core dump */
}

[nikomatsakis]

Duplicate of #1058, #1059.