[libqb] Patch for Cygwin

Angus Salkeld asalkeld at redhat.com
Fri Sep 7 09:55:08 UTC 2012


On 07/09/12 10:43 +0400, Виноградов Василий wrote:
>
>
>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.

OK, well thanks for trying. Do you need any more changes?

-A

>
>> -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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