Re: [BUG] [PATCH] Undefined symbols: "_posix_memalign" on Mac OS X

[Jens Axboe <jaxboe@fusionio.com>]

On 2011-04-25 13:42, Jens Axboe wrote:
> On 2011-04-23 12:06, Bruce Cran wrote:
>> On Sat, 23 Apr 2011 05:57:26 +0200
>> Filip Sneppe <filip.sneppe@gmail.com> wrote:
>>  
>>> (I am not subscribed to this list, nor am I a Unix developer).
>>>
>>> I wanted to give fio a try on my OS X 10.5.8 machine, but
>>> this is the error I received when compiling:
>>>
>>>     CC helpers.o
>>>     CC engines/posixaio.o
>>>     DEP depend
>>>     CC fio
>>> Undefined symbols:
>>>   "_posix_memalign", referenced from:
>>>       _thread_main in fio.o
>>> ld: symbol(s) not found
>>> collect2: ld returned 1 exit status
>>> make: *** [fio] Error 1
>>>
>>> After some googling, I learned that OS X doesn't
>>> provide _posix_memalign, and that apparently it's not
>>> needed on this platform. I "fixed" my compile problem with the
>>> attached patch. You may find it useful to write a better fix for this.
>>
>> I think Apple have added it in 10.6, but obviously fio needs to run on
>> older versions too.
> 
> Solaris has a helper, too. Does 10.6 have memalign or another
> alternative function?

We only use it for io_u allocations outside of places where we do have
posix_memalign() support. I just added a simpler malloc() wrapper that
aligns for that purpose, so we don't use posix_memalign() in the core
code anymore.

-- 
Jens Axboe