[swift-dev] Portable stdlib

[Andy Best]

Yes, exactly. Obviously you'd have to provide the necessary functionality
for your own platform (e.g. malloc, free, putc, etc.)

On Mon, 14 Aug 2017 at 6:54 pm, Slava Pestov <spestov at apple.com> wrote:

> On Aug 14, 2017, at 9:44 AM, Andy Best via swift-dev <swift-dev at swift.org>
> wrote:
>
> Hey,
>
> I'm currently looking at building a portable version of the standard
> library (for targeting microcontrollers, kernel dev, etc).
>
>
> I’m a bit confused about your terminology. By “portable” do you mean no
> dependencies on libc or POSIX?
>
>
> The easiest way to cross compile Swift at the moment (that I can find) is
> to get swiftc to generate LLVM IR (-emit-ir), and use clang to build and
> cross compile. This obviously leaves the problem that there won't be a
> standard lib to link against on the target.
>
>
> There’s a PR open to add cross-compilation support to the build system:
> https://github.com/apple/swift/pull/1398 It would be great if you or
> someone else would dust it off and get it merged in.
>
>
> I figured that the best way to accomplish this would probably be to
> implement whatever stubs are necessary for the target (e.g. all the libc
> calls).
>
> I am struggling to find the best way to build the standard library though.
> I've got a copy of the stdlib files, have run gyb over all of the
> templates, and am attempting to get swiftc to compile everything and output
> a giant IR file.
>
> I was wondering if there was an easier way to go about building a custom
> libswiftcore?
>
> It would obviously be great to be able to use Swift in this way without an
> OS, as it would open up a lot of opportunities for use of the language
> (embedded development, etc).
>
>
> Slava
>
>
>
> Thanks,
>
> Andy
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>
>
>
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