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Well, you just eat your broccoli as well as your fish [edit] or spam [/edit], or no pudding for you!
I wanna be a eunuchs developer! Pass me a bread knife!
modified 22-Mar-17 9:49am.
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I was kind of hoping you were real enough to understand.... now I know your just shell of a man 
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Shortest answer: go to osdev.org and start reading. This was great place that helped me start developing several level-0 applications (not full OS, though).
Short answer: For most of the things, there is no way to know at Runtime. For OS level this notation *-amd64, *-x86, *-arm64 means a little more than "compiled using that option". There are different system registers and other differences described in a ~1000+ pages manuals for each processor. Due to pre-processor you can make a slightly different version for each CPU architecture at compile time.
Honest answer: Take a look at the code of working linux/windows kernel. You will notice that programmers creating operating systems find that part a little fuzzy, too. Just accept it and live with it.
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Ok so in windows the install comes with various HALs, hardware abstraction layer, which is written specifically for a particular CPU, At install the type of CPU is detected by logic and the right HAL installed.
NT 4 used to support 4 CPU s I recall. It's less these days.
Linux probably wotks in a similar way.
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...when you travel. UK flight ban on electronic devices announced - BBC News[^]
OK, it's only inbound and a few countries at the moment, but ... my Nexus 7 is too long, too wide - and I wouldn't want to read a book on anything smaller. And you know as well as I do that security restrictions don't get eased, they get toughened up. 
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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More security theatre.
If you have an important point to make, don't try to be subtle or clever. Use a pile driver. Hit the point once. Then come back and hit it again. Then hit it a third time - a tremendous whack.
--Winston Churchill
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Singapore is laughing, Changi is not on the list of restricted airports so transiting through Doha or Dubai just became dramatically less attractive to a significant sector of the market.
Never underestimate the power of human stupidity
RAH
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That was the intent (well, curtailing gulf carriers to protect US carriers without incurring a WTO case was the intent)
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So if I want to fly - after my vacation in Anatolia - to the UK (to visit OG) I can't take my tablet on the plain, but flying directly from home I can?!
I think that security experts have to decide what is the threat? The men or the machine?
Skipper: We'll fix it.
Alex: Fix it? How you gonna fix this?
Skipper: Grit, spit and a whole lotta duct tape.
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Kornfeld Eliyahu Peter wrote: I think that security experts have to decide what is the threat take out the head from the butt think
FTFY
M.D.V.
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
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Come on! Don't be hard on them... Making decision is hard enough alone... doing it while thinking?!? 
Skipper: We'll fix it.
Alex: Fix it? How you gonna fix this?
Skipper: Grit, spit and a whole lotta duct tape.
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Back in 2006, when I was commuting between UK & Hungary, there was no hand luggage allowed at all. You were allowed to take through your ticket, passport and money.
In those days I was still smoking and the procedure was after check in, go airside, buy a pack of tabs and to the bar! People would shockingly TALK! There were never matches or lighters left at Smiths, but that was no worry as people who had bought them left them for others to use. oving around the airport was easy, no bags everywhere and even though there were the same number of flights, you could find seating, weird.
From the experience, I can say that the less people can take in the cabin, the better.
veni bibi saltavi
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Nagy Vilmos wrote: here were never matches or lighters left at Smiths,
Indian Airports have solved it elegantly, there is a heating resistance device on the wall of the smoking room.
Nagy Vilmos wrote: From the experience, I can say that the less people can take in the cabin, the better.
It makes it much faster and comfortable. The problem comes when companies have a policy, don't let your laptop out of your sight.
M.D.V.
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
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Nagy Vilmos wrote: People would shockingly TALK!
:shudders: now that was bad! Have you ever listened to people talking?
* CALL APOGEE, SAY AARDWOLF
* GCS d--- s-/++ a- C++++ U+++ P- L- E-- W++ N++ o+ K- w+++ O? M-- V? PS+ PE- Y+ PGP t++ 5? X R++ tv-- b+ DI+++ D++ G e++>+++ h--- ++>+++ y+++* Weapons extension: ma- k++ F+2 X
* Never pay more than 20 bucks for a computer game.
* I'm a puny punmaker.
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Sorry, but paper books are a fire risk and can be used as incendiary devices, so you'll have to just hum to yourself, for the eleven-hour flight.
I wanna be a eunuchs developer! Pass me a bread knife!
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Any affected device, including e-readers, will need to be placed into hold luggage.
It seems that bombs in the hold luggage are much safe than bombs in the cabin baggage.  
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Never left them.
If I buy a copy of a book, I want to own that copy. I don't want the publisher to be able to break into my house and remove the copy at some later date. I don't want the publisher deciding that I can't lend or give it to someone else. And I don't particularly want the publisher to destroy my copy when I die.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Probably a little bummmmmm...
Skipper: We'll fix it.
Alex: Fix it? How you gonna fix this?
Skipper: Grit, spit and a whole lotta duct tape.
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The manager of our QA department emailed me...
"I installed the **** app and it crashed. A screenshot is attached"
Here's what he sent me
This is the MANAGER of QA
If it's not broken, fix it until it is.
Everything makes sense in someone's mind.
Ya can't fix stupid.
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Nope, nothing there.
There now. 
modified 21-Mar-17 18:32pm.
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Nothing there between the managers ears, certainly...
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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Quite Asinine.
Meiosis rules!
I wanna be a eunuchs developer! Pass me a bread knife!
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Tell him to press 'Send', and that you won't be able to do anything until Microsoft gets back to you. 
Sudden Sun Death Syndrome (SSDS) is a very real concern which we should be raising awareness of. 156 billion suns die every year before they're just 1 billion years old.
While the military are doing their part, it simply isn't enough to make the amount of nukes needed to save those poor stars. - TWI2T3D (Reddit)
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