Re: [Xen-devel] build fixes

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 12/01/2010 17:42, "Patrick Colp" <pjcolp@xxxxxxxxx> wrote:

>> We build everything under tools/ with LFS support enabled, so off_t is 64
>> bits even in 32-bit environments. FYI The bits to enable LFS support are in
>> tools/Rules.mk.
> 
> According to the lseek64 man page, for 32-bit architectures to have 64-bit
> off_t, you need:
> 
> #define _FILE_OFFSET_BITS 64
> 
> Which, as far as I know, isn't set. LFS just makes lseek64 available
> (without it, the function doesn't exist).

I don't think so. 'getconf LFS_CFLAGS' returns -D_FILE_OFFSET_BITS=64 on a
32-bit host. It's LFS64_CFLAGS that gets you the explicit model for
large-file access (i.e., where you have to explicitly use the 64-bit off_t
and lseek variants).

 -- Keir



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