Message-ID: <BLU113-W4315666E7468F438E9B3D0BE1E0@phx.gbl>
From: Mike Marchywka <marchywka@hotmail.com>
To: <cygwin@cygwin.com>
Subject: RE: cygwin g++ strictness
Date: Thu, 6 Nov 2008 16:14:08 -0500
In-Reply-To: <490C4B7D.9000602@bmts.com>
References: <490A30C8.5000107@sh.cvut.cz>  <001601c93b31$a961b940$4001a8c0@mycomputer>   <003e01c93b42$e92a17a0$4001a8c0@mycomputer> <490AE8A0.8090009@sh.cvut.cz>   <001a01c93b4d$617de150$4001a8c0@mycomputer> <490AF1E3.3020308@sh.cvut.cz>   <007401c93b56$ebcfa510$4001a8c0@mycomputer> <490B0084.1070803@sh.cvut.cz>   <008a01c93b5a$9338d300$4001a8c0@mycomputer> <490B078B.9030007@byu.net>   <20081031135011.GB15518@calimero.vinschen.de>   <490B21E9.80807@lysator.liu.se> <011601c93b6e$49bbb710$4001a8c0@mycomputer>   <490B268D.3010801@byu.net> <AD4006A86F9C4CDA97D99556B68434C9@DFW5RB41>   <490C4B7D.9000602@bmts.com>
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> From: marchywka@whithouse.gov
> To:> Subject: RE: cygwin g++ strictness
> Date: Sat, 1 Nov 2008 10:05:54 -0400
> 
> 
> 
> 
>> 
>>>> It is not portable to platforms with 16-bit int (although 
>>>> these days, such platforms are museumware).
>>> 
>>> That, or:
>>> - Running your car's engineware.
>>> - Exploding an airbag into your face on detecting a collisionware.
>>> - Recording your vital signsware.
>>> - Pumping insulin into youware.
>>> - Doing your laundyware
>>> - Computerized exercise machinewear
>>> - Microwaveware
>>> - A billion other products with 8- and 16-bit microcontrollers in themware.
>>>
> 
 
If anyone wants to pursure this further, there are real devices like this and AFAIK
the mfg's still keep data sheets and app notes online, FWIW, 
 
http://autoelectronics.com/news/lead-story/ti_launches_mcus_1105/index.html
 
 
> These "resource constrained" devices are important to remember as even desktop
> computers have limitations - and desktop programmers, from 
> what I can see in how Flash and Acrobat function, often forget this. 
> 
>>> CSci doesn't begin and end with the CPU currently on our desks!
>> 
>> Thanks for reminding everyone that GCC is used for more than building
>> desktop software. And to bring this around to Cygwin again, I've been
>> using GCC for ARM under Cygwin for a few years now to build my Lua
>> for the LEGO MINDSTORMS NXT.
>> 
>> Having been through the gauntlet porting C code from 8 to 16 to 32 bit
>> machines, I've been bitten by almost every possible portability bug
>> there is - and I agree with Gary
> 
> Having been raised on the Z80, I find it refreshing to write phone apps
> and I still can't figure out how you write code that you just rebuild between
> ARM and Pentium. 
> 
> 
>> 
>> Fix it the right way so that it's truly protable.
> 
> The problem of course is that "your architecture may vary."
> This is a qualitative as well as quantitative ( as in the case of MPG)
> variation. Java is supposed to be the same on all platforms regardless
> of hardware and even floating point should always be exactly the same.
> Of course, in reality, your medical device and airbag care about time but
> the diff output doesn't.
> 
> Having ported an audio codec from java to various c++ targets,
> I can assure this is usually more than just getting int size right.
> 
> 
> As resources and constraints and objectives change, the implementation details
> can effect best choice of algorithm making portable optimized code very difficult
> ( this isn't just typedefs or picking up a few run time parameters). Existence
> of a cache is one important detail, and maybe you could argue that a 
> computationally intensive app would never get ported from a desktop to a 
> Z80 but the point of portability to make it limp along correctly if anyone needed to try. 
> 
> 
> Remember, truely platform independent code would not need a platform
> at all ( in fact, "independent" normally means "free of" or "unencumbered by"
> not " need one of a list of things "). 
> 
> 
> 
>>
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