Re: Build 0.6 version fail on musl libc

[Jens Axboe <axboe@kernel.dk>]

On 4/29/20 2:38 PM, Milan P. Stanić wrote:
> On Wed, 2020-04-29 at 14:08, Jens Axboe wrote:
>> 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.
> 
> patch is attached.

Great thanks, I added a bit to your commit message. Here it is:

https://git.kernel.dk/cgit/liburing/commit/?id=8171778c835b6be517c314cf23dd1f5ae061a117

-- 
Jens Axboe