[swift-dev] Please remove your Swift build directory

[Dmitri Gribenko]

On Wed, Jun 1, 2016 at 7:17 AM, Karl via swift-dev <swift-dev at swift.org> wrote:
> We’d configure it like this:
> - SWIFT_HOST_TRIPLE (e.g x86_64-unknown-linux-gnu)
> - SWIFT_DEPLOYMENT_TARGETS (e.g. x86_64-unknown-linux-gnu + armv7-linux-gnueabihf + armv7-none-linux-androideabi + i386-none-linux-androideabi + …)

Hi Karl,

One thing to keep in mind is that triples are not as useful as they
can seem to be, and trying to derive information from them can
sometimes be a futile exercise because the information just either
isn't there, or different vendors mean different things but use the
same triple.

This is an excellent thread on this topic from llvm-dev:

http://comments.gmane.org/gmane.comp.compilers.llvm.devel/87804

Also: https://wiki.debian.org/Multiarch/Tuples#Why_not_use_GNU_triplets.3F

I'm not saying that SDK/ARCH is a better replacement (it isn't, it is
currently a strict subset of the information from the triple), but at
least it is not the triple itself, so people don't have the
expectation of being able to provide the triple and let the system
figure out the rest.  So I'd be concerned about starting to treat the
triple as the primary piece of information, and the rest as secondary.

Dmitri

-- 
main(i,j){for(i=2;;i++){for(j=2;j<i;j++){if(!(i%j)){j=0;break;}}if
(j){printf("%d\n",i);}}} /*Dmitri Gribenko <gribozavr at gmail.com>*/