07.09.2012, 03:12, "Angus Salkeld" <asalkeld(a)redhat.com>:
On 06/09/12 15:46 +0400, Виноградов Василий wrote:
> I've made a mistake.
>
> Of course, dl_phdr_info structure doesn't depend on
ac_cv_atomic_need_memory_barrier.
> For this purpose I turn off "ac_cv_link_attribute_section=no" in the patch,
indeed.
>
> Under Cygwin GCC doesn't' have built-in atomic operations (undefined
references to __sync_synchronize(),
> __sync_bool_compare_and_swap(), __sync_fetch_and_add()) even for IA. But we still
need memory barriers.
> For this purpose we need to turn on "ac_cv_atomic_need_memory_barrier=yes"
or "nongcc_memory_barrier_needed=yes".
> I like the last more. Moreover, it is already used in configure.ac.
>
> New patch is attached.
Hi
I can commit something for you but just remembered something from
looking at the configure.ac file.
Did you try the following at all?
( CFLAGS="-march=<your arch> -mtune=native" ./configure )
I've just tried to recompile. It doesn't work. Therefore we have to enable memory
barriers explicitly in configure.ac.
-Angus
> 06.09.2012, 14:09, "Angus Salkeld" <asalkeld(a)redhat.com>:
>> On 06/09/12 09:48 +0400, Виноградов Василий wrote:
>>> Hi!
>>>
>>> I propose the following patch for compiling libqb under Cygwin.
>> Nice.
>>> Though, I'm not sure about memory barriers. They are disabled by setting
ac_cv_atomic_need_memory_barrier=no in configure.ac
>> What compiler are you using? I assume gcc. If so I think you will still need
ac_cv_atomic_need_memory_barrier.
>>> because Cygwin doesn't have dl_phdr_info structure and so on.
>>> Can anyone speak something about it?
>> You probably need to turn off "ac_cv_link_attribute_section=no" to
work
>> around the missing dl_phdr_info.
>>
>> Regards
>> Angus
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