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Date: Tue, 18 Aug 2015 01:22:49 +0200
From: magnum <>
Subject: Re: FMT_OMP_BAD

On 2015-08-18 00:09, JimF wrote:
> On Mon, 17 Aug 2015 16:43:00 -0500, magnum <>
> wrote:
>> On 2015-08-17 23:30, JimF wrote:
>>> If we put the
>>> #undef _OPENMP
>>> #endif
>>> at the very top of the C files, even before any includes, then the
>>> entire compile of this module will be done under the assumption that
>>> there is no OMP.
>> What if the fmt_main struct is slightly different for an OpenMP build?
>> Or db_main? Or some global parameter in params.h?
>>> I find this safer than having this #undef happening after all the
>>> header includes.
>> It's only safe if we can guarantee that no core struct or type or
>> whatever look different with OpenMP. I'm not 100% sure about that and
>> even if I were, I'd not be 100% sure no-one introduces such a caveat
>> tomorrow.
>>> It also removes the requirement for the #ifdef _OPENMP wrapper down
>>> in the format structure.  FMT_OMP and FMT_OMP_BAD will always be
>>> set with a 0 for the build, since there will be no _OPENMP set when
>>> the format.h is included.
>> Yes, but with the risk I described.
> Then the 'simple' fix, to make a OMP_FAST_FORMATS_DISABLE.h file or
> something like that then include that header very late, but before any
> declarations that take OMP. Probably before the 'omp.h' file or memdbg.h
> and put those 2 last.
> #undef _OPENMP
> #undef FMT_OMP
> #define FMT_OMP 0
> #undef FMT_OMP_BAD
> #define FMT_OMP_BAD 0
> #endif
> Then later if we have 'other' things that we need to properly adjust,
> we can properly do it 1 time within this file.

I totally fail to see how this would improve anything compared to 
current code (eg. rawMD5_fmt_plug.c). It merely adds a header that 
you'll need to look into to see the whole picture. I hate over-use of 
headers. Even despite that property of mine, just what would it buy us?

Besides, the current code works just fine. What is the rationale for 
"fixing" it?


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