Re: Build 0.6 version fail on musl libc

[Jens Axboe <axboe@kernel.dk>]

On 4/29/20 2:01 PM, Milan P. Stanić wrote:
> On Wed, 2020-04-29 at 13:38, Jens Axboe wrote:
>> On 4/29/20 1:33 PM, Milan P. Stanić wrote:
>>> On Wed, 2020-04-29 at 10:14, Jens Axboe wrote:
>>>> On 4/29/20 9:29 AM, Jens Axboe wrote:
>>>>> On 4/29/20 9:26 AM, Christoph Hellwig wrote:
>>>>>> On Wed, Apr 29, 2020 at 09:24:40AM -0600, Jens Axboe wrote:
>>>>>>>
>>>>>>> Not sure what the best fix is there, for 32-bit, your change will truncate
>>>>>>> the offset to 32-bit as off_t is only 4 bytes there. At least that's the
>>>>>>> case for me, maybe musl is different if it just has a nasty define for
>>>>>>> them.
>>>>>>>
>>>>>>> Maybe best to just make them uint64_t or something like that.
>>>>>>
>>>>>> The proper LFS type would be off64_t.
>>>>>
>>>>> Is it available anywhere? Because I don't have it.
>>>>
>>>> There seems to be better luck with __off64_t, but I don't even know
>>>> how widespread that is... Going to give it a go, we'll see.
>>>
>>> AFAIK, __off64_t is glibc specific, defined in /usr/include/fcntl.h:
>>> ------
>>> # ifndef __USE_FILE_OFFSET64
>>> typedef __off_t off_t;
>>> # else
>>> typedef __off64_t off_t;
>>> # endif
>>> ------
>>>
>>> So, this will not work on musl based Linux system, git commit id
>>> b5096098c62adb19dbf4a39b480909766c9026e7 should be reverted. But you
>>> know better what to do.
>>>
>>> I come with another quick and dirty patch attached to this mail but
>>> again  I think it is not proper solution, just playing to find (maybe)
>>> 'good enough' workaround.
>>
>> Let's just use uint64_t.
> 
> This works. Thanks.
> 
> Next issue is this:
> ----
> make[1]: Entering directory '/work/devel/liburing/src'
>      CC setup.ol
>      CC queue.ol
>      CC syscall.ol
> In file included from syscall.c:9:
> include/liburing/compat.h:6:2: error: unknown type name 'int64_t'
>     6 |  int64_t  tv_sec;
>       |  ^~~~~~~
> make[1]: *** [Makefile:43: syscall.ol] Error 1
> make[1]: Leaving directory '/work/devel/liburing/src'
> make: *** [Makefile:12: all] Error 2
> ----
> 
> I fixed it with this patch:
> --
> diff --git a/configure b/configure
> index 30b0a5a..4b44177 100755
> --- a/configure
> +++ b/configure
> @@ -301,6 +301,7 @@ EOF
>  fi
>  if test "$__kernel_timespec" != "yes"; then
>  cat >> $compat_h << EOF
> +#include <stdint.h>
>  struct __kernel_timespec {
>   int64_t   tv_sec;
>   long long tv_nsec;
> --
> 
> but not sure will that work on glibc.

That should work fine on glibc. Care to send as an actual
patch, with commit message and signed-off-by? Then I'll add
it to liburing.

-- 
Jens Axboe