xfs_io: fix test for fallocate on 32bit boxes

[Olaf Weber]

Looks good.


Reviewed-by: Olaf Weber <olaf at sgi.com>



Eric Sandeen writes:

> xfs_io: fix test for fallocate on 32bit boxes
> As per Red Hat bug 500487, fallocate64 is missing in glibc,
> so attempts to build with fallocate and _FILE_OFFSET_BITS=64
> will fail.

> So, change the config to test the way we will build, and
> it'll fail properly on x86 until glibc gets fixed.

> Signed-off-by: Eric Sandeen <sandeen at sandeen.net>
> ---

> diff --git a/m4/package_libcdev.m4 b/m4/package_libcdev.m4
> index 1ac4666..1c1859d 100644
> --- a/m4/package_libcdev.m4
> +++ b/m4/package_libcdev.m4
> @@ -105,6 +105,9 @@ AC_DEFUN([AC_HAVE_GETMNTINFO],
>  AC_DEFUN([AC_HAVE_FALLOCATE],
>    [ AC_MSG_CHECKING([for fallocate])
>      AC_TRY_LINK([
> +#define _GNU_SOURCE
> +#define _FILE_OFFSET_BITS 64
> +#include <fcntl.h>
>  #include <linux/falloc.h>
>      ], [
>           fallocate(0, 0, 0, 0);


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