Re: [PATCH] Makefile: introduce NO_PTHREADS

[Johannes Sixt <j.sixt@viscovery.net>]

Johannes Sixt schrieb:
> Mike Ralphson schrieb:
>> 2008/11/17 Johannes Sixt <j.sixt@viscovery.net>:
>>> Mike Ralphson schrieb:
>>>> 2008/11/15 Linus Torvalds <torvalds@linux-foundation.org>:
>>>>> On Sat, 15 Nov 2008, Junio C Hamano wrote:
>>>>>> This introduces make variable NO_PTHREADS for platforms that lack the
>>>>>> support for pthreads library or people who do not want to use it for
>>>>>> whatever reason.  When defined, it makes the multi-threaded index
>>>>>> preloading into a no-op, and also disables threaded delta searching by
>>>>>> pack-objects.
>>>>> Ack. Makes sense.
>>>> I'd be minded to make this the default on AIX to keep the prerequisite
>>>> list as small as possible, then people can opt-in for the performance
>>>> benefits if required.
>>> Is pthreads not a standard shipment on AIX? I would set NO_PTHREADS only
>>> if we know in advance that there are many installations without pthreads.
>>> (And I don't know what the situation is.)
>> I should have dug a bit further, it seems to be present on my 5.3
>> machines but I still need to determine whether it got installed by
>> default. Either way it must need some other link flags...
> 
> I tried compiling with THREADED_DELTA_SEARCH=Yes, and it fails with
> 
>     CC builtin-pack-objects.o
> In file included from /usr/include/sys/pri.h:29,
>                  from /usr/include/sys/sched.h:38,
>                  from /usr/include/sched.h:52,
>                  from /usr/include/pthread.h:43,
>                  from builtin-pack-objects.c:22:
> /usr/include/sys/proc.h:203: parse error before "crid_t"
> /usr/include/sys/proc.h:212: parse error before "p_class"
> /usr/include/sys/proc.h:355: parse error before '}' token
> 
> :-( Maybe NO_PTHREADS is indeed the safer choice? I'm not going to dig
> into this today, though. (I'm on AIX 4.3.something.)
> 
>>> BTW, this needs to be squashed in, because we don't have pthreads on Windows:
>>>
>>> diff --git a/Makefile b/Makefile
>>> index ffc9531..3a30b8c 100644
>>> --- a/Makefile
>>> +++ b/Makefile
>>> @@ -769,6 +769,7 @@ ifneq (,$(findstring MINGW,$(uname_S)))
>>>        NO_STRCASESTR = YesPlease
>>>        NO_STRLCPY = YesPlease
>>>        NO_MEMMEM = YesPlease
>>> +       NO_PTHREADS = YesPlease
>>>        NEEDS_LIBICONV = YesPlease
>>>        OLD_ICONV = YesPlease
>>>        NO_C99_FORMAT = YesPlease
>>>
>> Ta. Ok to add your S-o-B on a squashed patch?
> 
> Sure. Use this address please:
> 
> Signed-off-by: Johannes Sixt <j6t@kdbg.org>

Mike,

you said you would resend the patch, but I think you forgot about it.
Would you do that now, please?

-- Hannes