On 13/08/17 19:30, Martin Koegler wrote:
> On Sat, Aug 12, 2017 at 02:47:25PM +0100, Ramsay Jones wrote:
>> On 32-bit Linux, off_t is 64-bit and size_t is 32-bit.
>
> --- t.c ---
> #include <stddef.h>
> #include <stdio.h>
>
> int main()
> {
> printf("%d %d\n", sizeof(size_t), sizeof(off_t));
> }
> ------------
> $ gcc -m32 -o t t.c
> $ ./t.c
> 4 4
>
> So is that really true?
It should be, see commit b97e911643 ("Support for large files
on 32bit systems.", 17-02-2007), where you can see that the
_FILE_OFFSET_BITS macro is set to 64. This asks <stdio.h> et.al.,
to use the "Large File System" API and a 64-bit off_t.
I can't boot my 32-bit installation at the moment, and it seems
that my 64-bit multilib system is not playing ball:
$ gcc -m32 -D_FILE_OFFSET_BITS=64 -o t t.c
In file included from /usr/include/stdio.h:27:0,
from t.c:2:
/usr/include/features.h:367:25: fatal error: sys/cdefs.h: No such file or directory
compilation terminated.
$
ATB,
Ramsay Jones
