[libqb] Patch for Cygwin

Виноградов Василий wmdlr at yandex.ru
Fri Sep 7 06:43:03 UTC 2012



07.09.2012, 03:12, "Angus Salkeld" <asalkeld at 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 at 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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